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Enhancing mechanical properties and thermal shock resistance of mullite castables by introducing hollow aggregates 认领 引用
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作者 An-Kang Lu Shao-Bai Sang +3 位作者 Fu-Wen Chen Ya-Wei Li Tian-Bin Zhu Heng Wang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期10-21,共12页
It is important to enhance the mechanical properties and thermal shock resistance for the application of low thermal conductivity mullite castable in harsh service environments.The special hollow mullite aggregates wi... It is important to enhance the mechanical properties and thermal shock resistance for the application of low thermal conductivity mullite castable in harsh service environments.The special hollow mullite aggregates with silica-rich glass phase were firstly fabricated by a templating method.The mullite castables containing both traditional dense and synthesized hollow mullite aggregates were prepared,and their thermal conductivity,mechanical properties,and thermal shock resistance were investigated.Compared with the mullite castable with traditional aggregates,the thermal conductivity of the castable with hollow aggregates decreased,and their mechanical properties and thermal shock resistance were enhanced evidently.At elevated temperatures,the silica-rich glass phase in the hollow aggregates reacted with Al2O3 in the matrix to form in-situ mullite,thereby altering the bonding mechanism at the aggregate/matrix interface and enhancing the specific fracture energy of the material.When 50%of the traditional mullite aggregates were replaced by hollow aggregates,the room-temperature flexural strength and specific fracture energy of the mullite castable increased by 21.8%and 112.1%,respectively,while the thermal conductivity at 1000℃ was reduced to as low as 0.859 W/(m K). 展开更多
关键词 Hollow aggregate Mullite castable Fracture behavior Low thermal conductivity Thermal shock resistance
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Preparation of Porous Ceramics with Activated Carbon Impregnated Mullite Precursor and Their Properties 认领 引用
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作者 XI Jianfei ZHANG Ling +2 位作者 NIU Shunan LUO Shitong DUAN Mingjun 《China's Refractories》 CAS 2026年第1期29-37,共9页
The recycling of waste activated carbon is of great significance in environmental protection.Porous mullite ceramics were prepared by impregnating the mullite precursor with activated carbon,adding a pore-forming agen... The recycling of waste activated carbon is of great significance in environmental protection.Porous mullite ceramics were prepared by impregnating the mullite precursor with activated carbon,adding a pore-forming agent,and adopting aluminum sulfate octahydrate,ammonia and silica micropowder as raw materials,waste activated carbon after heat treatment as the pore-forming agent,and sodium polyacrylate(PAAS)as the dispersant.The effects of the activated carbon additions(1.5%,3.0%,5.2%,and 7.8%,by mass)and PAAS additions(1%,2%,and 3%,extra adding,by mass)on the physical properties,phase composition and microstructure of the porous ceramics were studied.The results show that:(1)as a pore-forming agent,activated carbon promotes the formation of pores inside the samples,while the apparent porosity of the samples increases significantly with the increasing activated carbon addition;when the activated carbon addition is 7.8%,the apparent porosity of the sample is 65.7%,the cold compressive strength is 4.62 MPa,the peak pore size is around 3.5μm,and the pore size distribution is uniform;(2)appropriate PAAS helps to improve the dispersion of activated carbon in the samples and the comprehensive performance of the porous mullite ceramics;when the PAAS addition is 2%,the apparent porosity of the sample is 71.8%,the cold compressive strength is 5.53 MPa,the peak pore size is around 3μm,and the pore size distribution is optimized;however,excessive PAAS increases the liquid phase in the system,resulting in over sintering of mullite and a decrease in the porosity. 展开更多
关键词 waste activated carbon porous mullite ceramics impregnating precursor dispersant
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Improving Thermal Shock Resistance of Porous SiC Membrane Supports for Hot-gas Cleaning via Mullite Bonding 认领 引用
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作者 LUO Zhiyong LIU Kaiqi +1 位作者 QING Hailong XIE Jinli 《China's Refractories》 CAS 2026年第2期5-12,共8页
Porous mullite-bonded SiC membrane supports for hot-gas cleaning were prepared by an in situ reaction bonding process.Their thermal shock resistance was evaluated as a function of the thermal shock temperature and the... Porous mullite-bonded SiC membrane supports for hot-gas cleaning were prepared by an in situ reaction bonding process.Their thermal shock resistance was evaluated as a function of the thermal shock temperature and thermal shock cycles by an instantaneous heating-air cooling technique,comparing with that of the commercial clay-bonded SiC support with similar SiC grain size,pore size and open porosity.It was found that the quenched specimens bonded by mullite exhibited a continuous increase in the cold modulus of rupture with the thermal shock temperature increasing from 400℃ to 1200℃,and the strength reached 24.7 MPa with an increase rate of 30%after thermal shock at 1200℃.This surprising behavior was quite different from that of the clay-bonded specimens which exhibited a gradual strength decrease when the thermal shock temperature exceeds 800℃.With the increase of the thermal shock cycles at the quenching temperature of 1200℃,the cold modulus of rupture of the mullite-bonded quenched specimens initially increased,and then remained unchanged.The thermal shock damage of the mullite-bonded SiC supports was avoided under the thermal shock test conditions.It can be attributed to the similar thermophysical properties and good chemical compatibility between mullite and SiC.The supports after high temperature thermal shock were obviously enhanced by the self-crack-healing ability of mullite-based binder and residual stress.Therefore,the porous SiC ceramics bonded by mullite exhibit excellent thermal shock resistance,and have greater potential than those bonded by clay for high temperature gas filtration and other applications,where cyclic thermal shock is desired for continuous operations. 展开更多
关键词 porous SiC ceramics membrane support mullite bonding thermal shock resistance strength
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Fabrication and Microstructural Optimization of Mullite-based Porous Ceramics 认领 引用
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作者 ZHANG Zheng ZHOU Wenying +1 位作者 JI Xiaojie ZHAO Degang 《China's Refractories》 CAS 2026年第2期17-22,共6页
To broaden the design and development of high-performance porous ceramics,mullite porous ceramics were prepared by the direct foaming method,using industrial alumina and Guangxi white clay as raw materials,α-sodium o... To broaden the design and development of high-performance porous ceramics,mullite porous ceramics were prepared by the direct foaming method,using industrial alumina and Guangxi white clay as raw materials,α-sodium olefin sulfonate as the foaming agent,modified polyethoxylated silicone(MPS)microemulsion as the foam stabiliser,and ammonium citrate as the dispersant.The effects of the MPS addition(0.2%,0.3%and 0.4%,by mass)and the stirring time(5,10 and 15 min)on the microstructure and properties of the ceramics were investigated.The results demonstrate that the main crystalline phase of the ceramics is mullite,with corundum as the secondary phase.With the increase in the MPS addition,the pore size distribution of the ceramics becomes more uniform while the median pore diameter decreases,and the cold compressive strength and bulk density increase.With the prolongation of the stirring time,the porosity and median pore diameter of the ceramics decrease first and then increase,while the cold compressive strength and bulk density show an opposite trend.With 0.3%MPS and a stirring time of 10 min,the mullite-based porous ceramics have the optimal performance. 展开更多
关键词 modified polyethoxylated silicone microemulsion porous ceramics pore structure mullite cold compressive strength
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基于高固相含量溶胶的C/Mullite复合材料氧化与热震行为研究 认领 引用
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作者 张伟 马青松 +2 位作者 曾宽宏 王为得 毛卫国 《材料导报》 EI CSCD 北大核心 2025年第19期262-266,共5页
得益于碳纤维的补强增韧,连续碳纤维增强莫来石(C/mullite)复合材料在航空航天热结构材料领域具有广阔的应用前景。为了进一步厘清C/mullite复合材料在服役环境下的失效行为,本工作系统研究了其在1300℃的氧化行为与1300~1500℃的热震... 得益于碳纤维的补强增韧,连续碳纤维增强莫来石(C/mullite)复合材料在航空航天热结构材料领域具有广阔的应用前景。为了进一步厘清C/mullite复合材料在服役环境下的失效行为,本工作系统研究了其在1300℃的氧化行为与1300~1500℃的热震行为。结果表明,1300℃时随着氧化时长增加,C/mullite复合材料的失重逐渐增加,力学性能逐渐衰退,其主要原因在于复合材料表面SiO2的粘性流动效果不佳。氧化和热交变的耦合作用使得C/mullite复合材料在1300℃热震10次(总氧化时长约50 min)后性能明显低于其在1300℃氧化60 min。此外,由于1500℃时C/mullite表面SiO2的粘性流动效应增强,复合材料在1400℃和1500℃热震后失重和性能没有明显差异。 展开更多
关键词 C/mullite复合材料 氧化 热震 力学性能 SiO2粘性流动
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Application Progress of Mullite Based Refractories 认领 引用
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作者 ZHANG Wei 《China's Refractories》 CAS 2025年第3期1-9,共9页
Mullite has a high melting point,high hardness,good thermal shock resistance,corrosion resistance,and high-temperature mechanical properties.Mullite raw materials are mostly synthesized by the sintering method and ele... Mullite has a high melting point,high hardness,good thermal shock resistance,corrosion resistance,and high-temperature mechanical properties.Mullite raw materials are mostly synthesized by the sintering method and electric fused method.The research and application progress of pure mullite and its composite refractories in fields such as ceramics,metallurgy,aerospace,military industry,cement and glass were reviewed.The future development trend of mullite in the application of refractories was prospected. 展开更多
关键词 mullite refractory metallurgy kiln furniture aerospace military industry
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CPAM-assisted synthesis of NaA zeolite membrane on macroporous mullite hollow fiber for ethanol dehydration by pervaporation 认领 引用 被引量：1
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作者 Liqin Tang Xiang Jin +2 位作者 Bing Gao Xuechao Gao Xuehong Gu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第1期66-80,共15页
Due to the low transport resistance,mullite hollow fiber(HF)could be regarded as a promising support for preparation of NaA zeolite membranes.However,insufficient coverage and undesired seed penetration often occur in... Due to the low transport resistance,mullite hollow fiber(HF)could be regarded as a promising support for preparation of NaA zeolite membranes.However,insufficient coverage and undesired seed penetration often occur in the seeding step of the mullite support due to the rough surfaces with ultra-large macropores(2-4 μm).This leads to poor intergrowth of the membrane layer.To solve this issue,cationic polyacrylamide(CPAM)was employed to modify the chemical and electrostatic properties of the mullite HF surface,where the electrostatic attraction between the surface and seed crystals could significantly promote the coating effect.In the seeding,the original seeds(3.2 μm)were mixed with the ball-milled seeds(0.3 μm)to improve the seed coverage,i.e.,the original seed was used to block the macropores on the support surface to prevent the penetration of small seeds,while the decked ball-milled seed was used to provide sufficient active sites to induce the intergrowth of the zeolite crystals.The effects of the concentration of CPAM,mixed mass ratio of seeds,and seed concentration on the preparation of NaA zeolite membranes were systematically examined,where the separation performances were characterized by pervaporation(PV)dehydration of 90%(mass)ethanol/water mixtures at 75℃.The results indicated that under a CPAM concentration of 0.7%(mass),an equivalent mass ratio of mixed seeds in a seed concentration of 1.0%(mass),the prepared mullite HF supported NaA zeolite membrane yielded the best PV performance,where the permeation flux and separation factor corresponded to 5.45 kg·m-2·h-1and 10000,respectively,being sufficient for industrial applications. 展开更多
关键词 CPAM-Modification NaA zeolite membranes Mullite hollow fiber Seeding Pervaporation
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High-throughput production of low-cost hydrophobic and oleophilic mullite fiber sponges for high-temperature PM filtration 认领 引用
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作者 Yuwen Hu Ruijian Zhu +2 位作者 Dazhi Zheng Shiou Liang Zengmei Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第19期250-262,共13页
Particulate matter(PM)from high-temperature emissions like chemical plants,coal stoves and vehicle exhausts poses a gravel challenge to human health.To address this issue,researchers have explored vari-ous fiber filte... Particulate matter(PM)from high-temperature emissions like chemical plants,coal stoves and vehicle exhausts poses a gravel challenge to human health.To address this issue,researchers have explored vari-ous fiber filters,yet the bulk struggle to withstand high temperatures.In this study,mullite fiber sponges were developed utilizing low-cost materials and Kármán vortex solution blow spinning,using surfac-tants to improve the spinnability of the sol.Optimized sponges demonstrate ultralight(19 mg cm-3),temperature-resistant reversible compressibility(50% strain)and a water contact angle of 135°.These sponges exhibited exceptional thermal insulation(thermal conductivity:0.0256 W m-1 K-1)and per-formed well in high-temperature air filtration.At 800℃,the mullite sponge with a base weight of 35 mg cm-2,achieved an average filtration efficiency of 98.18%and 99.57% for PM2.5 and PM2.5-10,respectively,with a quality value of 0.98 Pa-1 at a wind speed of 4 cm s-1.This low-cost mullite fiber sponge offers a promising avenue for designing high-performance filtration materials. 展开更多
关键词 Kármán vortex solution blow spinning Mullite fiber Thermal insulation High-temperature PM filtration
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Mechanical properties of mullite/5wt%nano-fly ash feedstock powders produced using mechanical alloying methods for plasma spraying:Towards sustainable coating solutions 认领 引用
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作者 Peerawatt Nunthavarawong Torsak Boonthai Masaki Fuchiwaki 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第9期2224-2237,共14页
This study examines how ball milling parameters,specifically rotational speeds(20,40,and 60 r/min)in dry and wet condi-tions,affect the development of mullite/5wt%nano-fly ash coatings on AISI 410 steel,focusing on th... This study examines how ball milling parameters,specifically rotational speeds(20,40,and 60 r/min)in dry and wet condi-tions,affect the development of mullite/5wt%nano-fly ash coatings on AISI 410 steel,focusing on their impact on feedstock powders and plasma-sprayed coatings.Optimized milling parameters at 60 r/min under wet conditions yielded high-quality feedstock powders with a particle size of 14μm and limited size distribution.Coatings produced from wet-milled powders demonstrated a higher deposition effi-ciency(35%)due to their smaller,uniformly distributed particles,which enhanced melting during the spraying process.These coatings also exhibited significantly lower porosity(7.9%),resulting in denser structures with superior mechanical properties,including a hardness of HV1647,fracture toughness of 1.41 MPa·m0.5,and a smoother surface finish with a roughness(Ra)of 6.1μm.Residual stress analysis showed that wet-milled coatings had higher residual stresses,reaching up to 165.95 MPa,compared to dry-milled coatings.This increase is attributed to finer particle sizes and rapid thermal cycling during deposition,which intensified tensile stresses within the coating.These results highlight the importance of optimizing milling parameters to enhance coating performance and process efficiency. 展开更多
关键词 mechanical alloying plasma spray coating mullite nano-fly ash nanocomposite
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Recent Advancements in the Additive Manufacturing of Mullite Ceramic Filter Elements for High-Temperature Melt Filtration 认领 引用
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作者 Shitong Wei Hongyu Xing +5 位作者 Yingbo Lv Guangchao Hao Hanwen Yu Zhenzhong Zhang Xinfeng Wang Bin Zou 《Additive Manufacturing Frontiers》 CSCD 2025年第1期159-176,共18页
Porous ceramic filters are key components in high-temperature metal-melt filtration processes.Mullite ceramics are widely used owing to their good high-temperature resistance,excellent chemical stability,and solid was... Porous ceramic filters are key components in high-temperature metal-melt filtration processes.Mullite ceramics are widely used owing to their good high-temperature resistance,excellent chemical stability,and solid waste green synthesis characteristics.However,traditional manufacturing processes face challenges in pore structure control for mullite ceramics and obtaining desirable mechanical properties,which limits their application.Recently,ceramic 3D-printing technology has emerged as a research hotspot,and its effectiveness for manufacturing complex 3D porous ceramic structures and controlling their mechanical properties has been demonstrated.This paper provides a detailed overview of the precursor system and toughening mechanisms of mullite,3D-printing technology for mullite ceramics,3D porous structure design for filters,and the melt purification mechanisms of these filters.The objective of this study was to use 3D-printing technology to efficiently manufacture mullite ceramic filter elements with customized structures,controllable pore characteristics,and desirable mechanical properties. 展开更多
关键词 3D printing Mullite ceramic Ceramic filter Solid waste
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Preparation and sintering properties of zirconia-mullite-corundum composites using fly ash and zircon 认领 引用 被引量：24
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作者 马北越 厉英 +1 位作者 崔绍刚 翟玉春 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第12期2331-2335,共5页
Zirconia-mullite-corundum composites were successfully prepared from fly ash,zircon and alumina powder by a reaction sintering process.The phase and microstructure evolutions of the composite synthesized at desired te... Zirconia-mullite-corundum composites were successfully prepared from fly ash,zircon and alumina powder by a reaction sintering process.The phase and microstructure evolutions of the composite synthesized at desired temperatures of 1 400,1 500 and 1 600°C for 4 h were characterized by X-ray diffractometry and scanning electronic microscopy,respectively.The influences of sintering temperature on shrinkage ratio,apparent porosity and bulk density of the synthesized composite were investigated.The formation process of the composites was discussed in detail.The results show that the zirconia-mullite-corundum composites with good sintering properties can be prepared at 1 600°C for 4 h.Zirconia particles can be homogeneously distributed in mullite matrix,and the zirconia particles are around 5μm.The formation process of zirconia-mullite-corundum composites consists of decomposition of zircon and mullitization process. 展开更多
关键词 zirconia mullite sintering properties reaction sintering process fly ash zircon
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Preparation and oxidation resistance of mullite/SiC coating for carbon materials at 1150 ℃ 认领 引用 被引量：18
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作者 杨鑫 苏哲安 +1 位作者 黄启忠 柴立元 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期2997-3002,共6页
To protect carbon materials from oxidation, mullite/SiC coatings were prepared on graphite by chemical vapor reaction (CVR) and slurry sintering. The XRD analyses show that the phase of the outer-layer coating is comp... To protect carbon materials from oxidation, mullite/SiC coatings were prepared on graphite by chemical vapor reaction (CVR) and slurry sintering. The XRD analyses show that the phase of the outer-layer coating is composed of SiO2 and mullite, and the inner-layer coating is mainly composed of β-SiC. The anti-oxidation behavior of the coating and the Rockwell hardness (HRB) of the coating after oxidation were investigated. The oxidation test shows that the as-prepared multi-layer coating exhibits excellent antioxidation and thermal shock resistance at high temperature. After oxidation at 1150 ℃ for 109 h and thermal shock cycling between 1150 ℃ and room temperature for 12 times, the mass gain of the coated sample is 0.085%. Meanwhile, the indentation tests also demonstrate that the as-prepared coating has good bonding ability between the layers. 展开更多
关键词 carbon materials oxidation resistance coating SiC mullite
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Cu含量对Mullite/Al-Cu复合材料时效硬化行为的影响 认领 引用 被引量：14
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作者 李伟 沈保罗 +6 位作者 景山 高升吉 涂铭旌 王鸿华 吴桢干 张荻 吴人洁 《中国有色金属学报》 EI CAS 北大核心 2001年第2期254-257,共4页
用挤压铸造方法制备了Mullite/Al Cu复合材料。用硬度测试仪、差示扫描量热仪 (DSC)和透射电镜(TEM)等设备研究了铝基复合材料及其基体合金中Cu含量变化对时效硬化行为的影响 ,同时还研究了增强纤维对时效相的析出序列、析出相和位错结... 用挤压铸造方法制备了Mullite/Al Cu复合材料。用硬度测试仪、差示扫描量热仪 (DSC)和透射电镜(TEM)等设备研究了铝基复合材料及其基体合金中Cu含量变化对时效硬化行为的影响 ,同时还研究了增强纤维对时效相的析出序列、析出相和位错结构的影响。结果表明 ,无论是在复合材料中还是在基体合金中 ,随着Al Cu合金中Cu含量的增加 ,时效硬化过程均有不同程度的加速 ;Mullite纤维的引入提高了Al Cu合金的时效硬度 ,明显加速了Al Cu合金的时效硬化过程 ,对GP区的形成有抑制作用 。 展开更多
关键词 Mullite短纤维 铝-铜合金 时效 位错 复合材料
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Preparation of Mullite Whiskers and Their Enhancement Effect on Ceramic Matrix Composites 认领 引用 被引量：10
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作者 张锦化 WU Hongdan +2 位作者 ZHANG Suxin Yu Jishun 侯书恩 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第3期471-475,共5页
Mullite whiskers were facilely prepared by sintering kyanite at high temperature, with the addition of AlF3·3H20. The as-prepared whiskers have been characterized systematically in terms of phase composition, mor... Mullite whiskers were facilely prepared by sintering kyanite at high temperature, with the addition of AlF3·3H20. The as-prepared whiskers have been characterized systematically in terms of phase composition, morphology, and structure. Results showed that the morphology and size of mullite whiskers were strongly depended on the content of AlF3·3H20 and sintering temperature. At temperatures in the range of 1 100 to 1 500 ℃ with 4 wt% addition of AlF3·3H20, the well-shaped mullite whiskers were obtained. For an instance, the mullite whiskers with 5-10 μm in length and 0.1-0.2 μm in cross-section could be formed at 1 400 ℃, with 4 wt% addition of A1F3·3H20. Moreover, results showed that the addition of mullite whiskers into ceramic matrix enhanced its fracture toughness significantly. 展开更多
关键词 mullite whiskers kyanite ceramics SEM nanocrystalline materials
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Kinetics of decomposition of mullite and corundum in coal fly ash under highly alkaline condition 认领 引用 被引量：6
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作者 Chun-li LIU Shu-hua MA +3 位作者 Jian DING Yang LUO Shi-li ZHENG Yi ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第4期868-875,共8页
Decomposition kinetics of mullite and corundum in coal fly ash with highly alkaline solution was studied.The effects of the reaction temperature and reaction time on decomposition rates of mullite and corundum and alu... Decomposition kinetics of mullite and corundum in coal fly ash with highly alkaline solution was studied.The effects of the reaction temperature and reaction time on decomposition rates of mullite and corundum and alumina extraction efficiency were investigated.The results show that increasing reaction temperature and reaction time increases the decomposition rates of mullite and corundum and alumina extraction efficiency,with the decomposition temperature of mullite lower than that of corundum.After 90 min reaction at 220℃,more than 100 g alumina was extracted when recycling 1 L of alkaline solution.The decomposition processes of mullite and corundum corresponded with the shrinking unreacted core model,and the reaction rate was under chemical reaction control,with the activation energies of mullite and corundum being 67.46 and 161.82 kJ/mol,respectively. 展开更多
关键词 coal fly ash mullite corundum decomposition kinetics alumina
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Mullite Oxidation Resistant Coating for SiC-coated Carbon/Carbon Composites by Supersonic Plasma Spraying 认领 引用 被引量：7
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作者 Chao Ma Hejun Li +7 位作者 Heng Wu Qiangang Fu Can Sun Xiaohong Shi Yulei Zhang Zhengzhong Zhang Jun Tao Zhihai Han 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2013年第1期29-33,共5页
To improve the oxidation resistance of carbon/carbon （C/C） composites, mullite coating was prepared on the surface of SiC-coated C/C composites by supersonic plasma spraying. Phases and microstructures of mullite co... To improve the oxidation resistance of carbon/carbon （C/C） composites, mullite coating was prepared on the surface of SiC-coated C/C composites by supersonic plasma spraying. Phases and microstructures of mullite coating were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The coating primarily consists of a single phase of mullite （3AI203-2SIO2）. The SEM results show that mullite coating was continuous and well bonded with the SiC inner layer without penetrating crack. Mullite coating exhibited good oxidation resistance, After 98.5 h oxidation at 1773 K and 9 thermal shock cycles between 1773 K and room temperature, the weight loss of the coated C/C composites was only 2.57%. 展开更多
关键词 Mullite coating Supersonic plasma spraying Carbon/carbon composites Oxidation
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PIP法制备3D NextelTM 720/Mullite复合材料 认领 引用 被引量：6
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作者 张福平 陈照峰 +2 位作者 张立同 成来飞 徐永东 《航空材料学报》 EI CAS 2002年第2期33-36,共4页
采用先驱体浸渗热解法制备了 3DNextelTM 72 0 Mullite复合材料 ,并对基体的组分控制、复合材料致密化以及热处理温度对复合材料强度的影响进行了研究。结果表明 ,采用正硅酸已酯和异丙醇铝作为先驱体可以在相对低温 (≤ 12 0 0℃ )通... 采用先驱体浸渗热解法制备了 3DNextelTM 72 0 Mullite复合材料 ,并对基体的组分控制、复合材料致密化以及热处理温度对复合材料强度的影响进行了研究。结果表明 ,采用正硅酸已酯和异丙醇铝作为先驱体可以在相对低温 (≤ 12 0 0℃ )通过循环浸渗热解制备孔隙率低于 2 0 %的复合材料。 展开更多
关键词 PIP法 制备 3D Nextel^TM720/Mullite 复合材料 先驱体热解浸渗热解 致密化
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Molten salt synthesis of mullite nanowhiskers using different silica sources 认领 引用 被引量：3
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作者 Tao Yang Peng-long Qiu +3 位作者 Mei Zhang Kuo-Chih Chou Xin-mei Hou Bai-jun Yan 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第8期884-891,共8页
Mullite nanowhiskers with Al-rich structure were prepared by molten salt synthesis at 1000°C for 3 h in air using silica, amorphous silica, and ultrafine silica as the silica sources. The phase and morphology of ... Mullite nanowhiskers with Al-rich structure were prepared by molten salt synthesis at 1000°C for 3 h in air using silica, amorphous silica, and ultrafine silica as the silica sources. The phase and morphology of the synthesized products were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and transmission electron microscopy. A thermogravimetric and differential thermal analysis was carried out to determine the reaction mechanism. The results reveal that the silica sources play an important role in determining the morphology of the obtained mullite nanowhiskers. Clusters and disordered arrangements are obtained using common silica and amorphous silica, respectively, whereas the use of ultrafine silica leads to highly ordered mullite nanowhiskers that are 80-120 nm in diameter and 20-30 μm in length. Considering the growth mechanisms, mullite nanowhiskers in the forms of clusters and highly ordered arrangements can be attributed to heterogeneous nucleation, whereas disordered mullite nanowhiskers are obtained by homogenous nucleation. 展开更多
关键词 mullite nanowhiskers morphology silica molten salt
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微波加热制备SiC/Mullite球体的工艺和性能 认领 引用 被引量：5
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作者 张磊 杨久俊 王雪平 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2011年第3期526-529,共4页
以粉煤灰微珠和炭黑为原料,通过微波加热碳热还原法原位合成了SiC/Mullite球体。利用X射线衍射(XRD),场发射扫描电子显微镜(FESEM)对产物进行了物相和结构表征。研究表明:在1100～1300℃之间,微珠表面的SiO2通过固(SiO2)-固(C)反应机理... 以粉煤灰微珠和炭黑为原料,通过微波加热碳热还原法原位合成了SiC/Mullite球体。利用X射线衍射(XRD),场发射扫描电子显微镜(FESEM)对产物进行了物相和结构表征。研究表明:在1100～1300℃之间,微珠表面的SiO2通过固(SiO2)-固(C)反应机理而形成SiC,而内部Mullite依然维持微珠球形骨架,从而形成SiC/Mullite球体。温度高于1300℃时,SiC通过固-液-气机理定向生长为晶须且Mullite亦参与反应,从而使粉煤灰微珠失去其球形形貌。本试验的最佳工艺条件为n(C):n(SiO2)=4.2,温度1200℃下恒温1h。 展开更多
关键词 粉煤灰微珠 微波加热 碳热还原 SiC/Mullite球体 SiC晶须
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Microstructure and properties of mullite-based porous ceramics produced from coal fly ash with added Al_2O_3 认领 引用 被引量：14
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作者 Jian-bin Zhu Hong Yan 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2017年第3期309-315,共7页
Using coal fly ash slurry samples supplemented with different amounts of Al2O3, we fabricated mullite-based porous ceramics via a dipping-polymer-replica approach, which is a popular method suitable for industrial app... Using coal fly ash slurry samples supplemented with different amounts of Al2O3, we fabricated mullite-based porous ceramics via a dipping-polymer-replica approach, which is a popular method suitable for industrial application. The microstructure, phase composition, and compressive strength of the sintered samples were investigated. Mullite was identified in all of the prepared materials by X-ray diffraction analysis. The microstructure and compressive strength were strongly influenced by the content of Al2O3. As the Al/Si mole ratio in the starting materials was increased from 0.84 to 2.40, the amount of amorphous phases in the sintered microstructure decreased and the compressive strength of the sintered samples increased. A further increase in the Al2O3content resulted in a decrease in the compressive strength of the sintered samples. The mullite-based porous ceramic with an Al/Si molar ratio of 2.40 exhibited the highest compressive strength and the greatest shrinkage among the investigated samples prepared using coal fly ash as the main starting material. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg. 展开更多
关键词 Aluminum Amorphous materials Ceramic materials Coal Coal ash Fly ash Microstructure Mullite Porous materials Silicate minerals Sintering Strength of materials X ray diffraction analysis
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