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Enhanced thermal shock resistance of SPS sintered h-BN based ceramics with Al3BC3 addition 认领 引用
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作者 Hao-Tian Li Chao Yu +6 位作者 Hao Yan Xu Cheng Jun Ding Zheng-Long Liu Bei-Yue Ma Hong-Xi Zhu Cheng-Ji Deng 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第2期75-87,共13页
The exceptional properties of h-BN based ceramics are fundamental to their advancement in practical applications.The introduction of Al3BC3into h-BN based ceramics effectively enhanced the thermal shock resistan... The exceptional properties of h-BN based ceramics are fundamental to their advancement in practical applications.The introduction of Al3BC3into h-BN based ceramics effectively enhanced the thermal shock resistance and maintained the mechanical integrity.h-BN based ceramics were fabricated using a discharge plasma sintering process,wherein the residual flexural strength ratio of all specimens exceeded 100%when incorporating varying amounts of Al3BC3.Furthermore,parameters R and were examined to describe the crack initiation and propagation induced by thermal strain under steady-state heat flux,respectively.The observed improvements in residual flexural strength at elevated thermal shock temperatures can be primarily attributed to the matrix evolution through the formation of an in-situ reinforcing phase,along with the generation of Al18B4O33 whiskers via surface oxidation.At a content of 30 wt.%Al3BC3,the optimized values for residual flexural strength and the corresponding ratio,when temperature difference reached 1200℃,were measured at 252.4 MPa and 110.1%,respectively. 展开更多
关键词 h-BN Al3BC3 Thermal property Thermal shock resistance Residual strength
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Enhancement in erosion resistance of Al2O3-SiC-C refractories for high scrap steel ratio ladles:role of MgAl2O4 spinel 认领 引用
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作者 Chen Hu Cheng-Ji Deng +4 位作者 Chao Yu Jun Ding Zheng-Long Liu Jin-Tao Wang Bei-Yue Ma 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期100-109,共10页
To resolve severe slag penetration and erosion in Al2O3-SiC-C refractories during high scrap ratio iron ladle operation,a novel strategy utilizing exogenous MgAl2O4 spinel as a sacrificial FeOx scavenge... To resolve severe slag penetration and erosion in Al2O3-SiC-C refractories during high scrap ratio iron ladle operation,a novel strategy utilizing exogenous MgAl2O4 spinel as a sacrificial FeOx scavenger was proposed.Al2O3-SiC-C refractories produced with plate-like corundum,silicon carbide,and flake graphite incorporating MgAl2O4 additives were cured at 1400℃ in the condition of carbon embedding.The impacts of additives on phase composition,microscopic morphology,and performance of materials were studied.The results indicated that Al2O3-SiC-C refractories with the addition of 2 wt.%MgAl2O4 exhibited a smaller oxidation area after oxidation tests compared to samples without MgAl2O4,resulting in 28%improvement in oxidation resistance compared to blank samples.In the erosion test,the results informed that adding 4 wt.%MgAl2O4 induced significant interfacial slag modification:MgAl2O4 dynamically dissolved FeOx to form protective Mg(Fe,Al)2O4 solid solution on the slag-refractory interface.This sacrificial dissolution effectively immobilized FeOx,elevated local slag viscosity,and fundamentally inhibited slag penetration and matrix dissolution.The erosion index decreased from 50%in the blank group to 27.4%. 展开更多
关键词 Al2O3-SiC-C refractory MgAl2O4spinel Erosion resistance Oxidation resistance High scrap ratio
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Effect of Eu2O3 on sintering properties and resistance to slag wetting and penetration of MgO-MgAl2O4 refractory materials 认领 引用
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作者 Wen-yu Zan Bei-yue Ma +11 位作者 Rui-qi Cao Zhang-yan Zhou Jian-huai Tang Jia-long Tian Chao Yu Guang-yi Zhao Guang-ming Li Cheng-cheng Zhang Cheng-ji Deng Hong-tao Shen Yu-xiang Wang Qing-dong Hou 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第12期4510-4527,共18页
Alkaline slag is vital in rare earth steel refining,making it crucial to study the wetting and penetration mechanisms between refractory materials and slag.The effect of Eu2O3 doping on the sintering properties ... Alkaline slag is vital in rare earth steel refining,making it crucial to study the wetting and penetration mechanisms between refractory materials and slag.The effect of Eu2O3 doping on the sintering properties of MgO-MgAl2O4 refractory materials was investigated while simulating the wetting behavior between the refractory and the CaO-Al2O3-SiO2-MgO quaternary alkaline slag during rare earth steel smelting to improve the material’s resistance to alkaline slag corrosion.The doping of Eu2O3 can alter the crystal structure parameters of MgAl2O4 and MgO,causing lattice distortion.This lattice activation promotes interionic mass and diffusion,helping reduce porosity and promote densification of the material,further improving sintering properties.At the equilibrium wetting temperature(1723 K),Eu2O3 doping increases the interfacial free energy between the slag and refractory material,reducing the spreading coefficient of the molten slag.The contact angle increases from 32.1°to 42.2°,and the residual slag volume increases from 17.9%to 23.5%.The results of thermodynamic analysis show that MgAl2O4 and EuAlO3 formed at the interface block the penetration of molten slag at high temperatures,improving the resistance of MgO-MgAl2O4 refractories to alkaline slag corrosion.Based on the capillary theory model,it was calculated that the capillary tension of the slag gradually increases with the addition of Eu2O3,while the theoretical penetration depth of the slag gradually decreases.The experimental results showed that the slag erosion depth of the sample decreased from 102.54 to 68.28μm. 展开更多
关键词 MgO-MgAl2O4refractory Rare earth oxide Molten slag Sintering property Wetting behavior
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Effect of talc powder on properties of Y2O3-based ceramics 认领 引用
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作者 Wei Fan Wen-yu Zan +5 位作者 Bei-yue Ma Shao-gang Cui Hao Liu Chao Yu Zhou-fu Wang Cheng-ji Deng 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第10期3398-3409,共12页
The rapid advancement of superalloy melting technology has increased the demands on crucible materials.Y2O3 is a promising candidate for nickel-based superalloy melting due to its outstanding high-temperature st... The rapid advancement of superalloy melting technology has increased the demands on crucible materials.Y2O3 is a promising candidate for nickel-based superalloy melting due to its outstanding high-temperature stability and non-wetting behavior with various alloys.However,its poor sintering performance limits its development.High-density Y2O3 ceramics were successfully prepared via pressureless sintering at 1600℃ in a carbon-embedded atmosphere with talc powder as an additive.The resulting ceramics achieved optimal properties,including a bulk density of 4.27 g cm−3,apparent porosity of 1.1%,and cold compressive strength of 311.27 MPa.The talc powder introduced a liquid phase during sintering,which accelerated mass transfer and promoted grain growth and densification.During cooling,this liquid phase remained at the grain boundaries and acted as an intergranular bonding agent,strengthening grain cohesion.Nevertheless,excessive liquid phase hindered grain growth,negatively affecting sintering.Additionally,the extremely low porosity and the formation of the Mg2SiO4 phase reduced the residual strength retention ratio of the Y2O3 ceramic after thermal shock. 展开更多
关键词 Talc powder additive Y2O3ceramic Liquid-phase sintering Sintering property Thermal shock resistance
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Preparation and microstructure regulation of MgO–CaO–Y2O3 refractories with enhanced slag resistance 认领 引用
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作者 Hu-lin Jin Yan Ma +10 位作者 Zhou-fu Wang Hao Liu Yun-jie Dong Nian Yi Xi-tang Wang Cheng-ji Deng Zhong-feng Xia Zheng-huang Quan Ling Zhang Guang-da Tong Wei-dong Fu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第10期3381-3397,共17页
MgO–CaO refractories have attracted much attention in the field of clean steel due to the ability of their internal CaO to adsorb elements such as S and P in molten steel.However,there are still some problems such as... MgO–CaO refractories have attracted much attention in the field of clean steel due to the ability of their internal CaO to adsorb elements such as S and P in molten steel.However,there are still some problems such as difficult sintering and insufficient corrosion resistance existing in this system.Different contents of Y2O3 were introduced into MgO–CaO system to prepare MgO–CaO–Y2O3 ternary refractories via traditional and induction sintering methods.The influence of microstructural regulation on the slag-resistant properties of the refractories was investigated.The results show that the introduction of Y2O3 in the MgO–CaO refractories prepared via the two sintering methods leads to the grain boundary reconstruction effect.Under the condition of traditional sintering,when a smaller amount of Y2O3 is introduced into the MgO–CaO refractories,Y2O3 is able to activate the lattice,promote sintering,and improve the densification of the refractories.However,when more Y2O3 is introduced,the excess Y2O3 hinders the sintering densification process.Combined with lamellar intergranular phase generated in the refractories,Y2O3-based solid solution can react with the slag,increase the slag viscosity and inhibit the penetration of the slag into the refractories.Under the condition of induction sintering,the solid solution of yttrium ions in CaO is increased by using the coupling of electromagnetic and thermal fields.Compared with the MgO–CaO refractories with high Y2O3 content prepared by traditional sintering,the induction sintered refractories have higher densification,which further increases the corrosion resistance.The results provide a new path for developing long-life MgO–CaO based refractories. 展开更多
关键词 MgO-CaO refractory Grain boundary reconstruction Induction sintering Slag resistance
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Fabrication and mechanical properties of in-situ Si3N4bonded MgO-C refractories by nitrogen gas pressure sintering 认领 引用 被引量：1
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作者 Xu Cheng Chao Yu +6 位作者 Guang-chao Xing Bei-yue Ma Jun Ding Zhou-fu Wang Ji-xiang Zhang Hong-xi Zhu Cheng-ji Deng 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第7期2016-2026,共11页
Nitrogen gas pressure sintering was successfully employed to achieve the in-situ formation of Si3N4-bonded MgO-C refractories.The primary objective was to investigate the influence of different gas pressures on ... Nitrogen gas pressure sintering was successfully employed to achieve the in-situ formation of Si3N4-bonded MgO-C refractories.The primary objective was to investigate the influence of different gas pressures on the mechanical properties and microstructure of MgO-C refractories.The results indicate that higher nitrogen pressure promotes the transformation of silicon nitride from theαphase to theβphase.This phase transition positively impacts the mechanical properties of Si3N4-bonded MgO-C refractories,leading to an enhancement in their overall strength.Notably,when the nitrogen pressure was set at 3 MPa,exceptional compressive strength of 109.7 MPa and an elastic modulus of 142.4 GPa were achieved by these prepared refractories.These findings highlight the great potential for utilizing gas pressure sintered Si3N4-MgO-C refractories. 展开更多
关键词 MgO-C refractory Si3N4 Gas pressure sintering Physical property
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Enhanced oxidation resistance of low-carbon MgO-C refractories with ternary carbides:a review 认领 引用 被引量：10
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作者 Chao Yu Bo Dong +5 位作者 Yu-feng Chen Bei-yue Ma Jun Ding Cheng-ji Deng Hong-xi Zhu Jing-hui Di 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2022年第7期1052-1062,共11页
The demand for low-carbon MgO–C refractories is ever growing to meet the development of advanced steelmaking technologies and efficient energy conservation.Meanwhile,to improve the oxidation resistance and inhibit th... The demand for low-carbon MgO–C refractories is ever growing to meet the development of advanced steelmaking technologies and efficient energy conservation.Meanwhile,to improve the oxidation resistance and inhibit the weakness of low-carbon MgO–C refractories,antioxidants are necessary.The application of ternary carbides that focused on improving the oxidation performance of MgO–C refractories has been explored,and the ternary carbides including Al4O4C,Al8B4C7,Al4SiC4,Ti2AlC,Ti3AlC2,and Ti3SiC2have been proved effective.The crystal structure,physical properties,oxidation behavior,and synthesis of these ternary carbides were summarized,and their oxidation mechanism in assisting antioxidation of MgO–C refractories was discussed.In addition,the potential aspects related to the usage and development of ternary carbides in low-carbon MgO–C refractories were proposed. 展开更多
关键词 Low-carbon MgO–C refractory Ternary carbide MAX phase Oxidation mechanism Oxidation resistance
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Effect of micro-Al2O3 powders on oxidation and corrosion behaviors of low-carbon MgO-C refractories 认领 引用
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作者 Yang Chen Zeng-yi Li +4 位作者 Hao-bo Tan Yu-ran Fu Jun Ding Cheng-ji Deng Chao Yu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第6期1522-1534,共13页
To solve the problem of poor high-temperature service performance caused by low carbonization of MgO-C refractories,low-carbon MgO–C refractories with excellent thermal shock,oxidation and corrosion resistances were ... To solve the problem of poor high-temperature service performance caused by low carbonization of MgO-C refractories,low-carbon MgO–C refractories with excellent thermal shock,oxidation and corrosion resistances were successfully designed by using SiC whiskers as reinforcing phases and introducing micro-Al2O3 powders as additives.The results indicated that the addition of micro-Al2O3 powders optimized the internal structure of the material,like the columnar β-Si3N4 with a stepped distribution and the mosaic structure formed between granular and flaky Mg2SiO4,which synergistically strengthened and toughened the material and gave the material excellent mechanical properties and thermal shock resistance.Specifically,the cold modulus of rupture and cold crushing strength after thermal shock were increased by 4.1 and 20.3 MPa,respectively.Moreover,the addition of micro-Al2O3 powders promoted the formation of fine particles of Mg2SiO4,MgAl2O4 and MgO,as well as a dense protective layer of Mg2SiO4 in the material under high-temperature environment.Furthermore,spinel and high-temperature solid solution were formed in the corrosion environment.The oxidation and corrosion resistances were greatly improved by 41%and 15%,respectively. 展开更多
关键词 Low-carbon MgO-C refractory Oxidation resistance Corrosion resistance Thermal shock resistance Micro-Al2O3powder
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A review on graphite surface modification methods towards low carbon-containing refractories 认领 引用 被引量：1
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作者 Ting-ting Zhang Jun Ding +3 位作者 Bei-yue Ma Zheng-long Liu Chao Yu Cheng-ji Deng 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第6期1291-1303,共13页
The rapid development of iron and steel metallurgy technology has promoted the continuous innovation and iteration of carbon-containing refractories for clean steel smelting.To meet the high-quality requirements for c... The rapid development of iron and steel metallurgy technology has promoted the continuous innovation and iteration of carbon-containing refractories for clean steel smelting.To meet the high-quality requirements for clean steel production and full exploit the performance advantages of carbon-containing refractories in dynamic smelting environment,it is necessary to explore the role of graphite and modified graphite in carbon-containing refractories.Based on this,graphite surface modification methods,including surfactants,surface oxidation,and surface coating,and their applications in carbon-containing refractories are reviewed.The advantages and disadvantages of each method are analyzed for practical use.Furthermore,combined with the existing problems,the application prospect of improved graphite in carbon-containing refractories is discussed. 展开更多
关键词 Graphite Carbon-containing refractory Clean steel Surface modification Service performance
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Effect of nano-graphite on mechanical properties and oxidation resistance of ZrB2-SiC-graphite electrode ceramics 认领 引用 被引量：1
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作者 Bo-lin Yang Chang-liu Kuang +3 位作者 Zheng-long Liu Chao Yu Cheng-ji Deng Jun Ding 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第6期1502-1513,共12页
ZrB2-based ceramic composites were prepared by spark plasma sintering using ZrB2 powder prepared by molten salt method as raw material and SiC and nano-graphite as additives.The effects of nano-graphite addition... ZrB2-based ceramic composites were prepared by spark plasma sintering using ZrB2 powder prepared by molten salt method as raw material and SiC and nano-graphite as additives.The effects of nano-graphite addition on the physical properties and oxidation resistance of ZrB2-based ceramic samples were investigated.The results show that the addition of an appropriate amount of nano-graphite can effectively improve the density of ZrB2-based ceramic composites and improve the physical properties of the materials.The flexural strength of the ceramic sample with 8 vol.%nano-graphite reached 418.54 MPa,which was 53.14% higher than that of ZrB2-SiC ceramic material(273.31 MPa),and its oxidation resistance was also significantly improved.It demonstrats that the addition of an appropriate amount of nano-graphite can effectively improve the physical properties and oxidation resistance of ZrB2-SiC ceramic composites.Via prolonging its service life in application and promoting the development of ZrB2-based ceramic composites,it is of great significance for clean steel smelting. 展开更多
关键词 ZrB2-SiC-graphite electrode ceramic ZrB2-based ceramic composite Nano-graphite Physical property Oxidation resistance
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Selective sintering of magnesia-calcia materials by utilizing hot spots during induction sintering process 认领 引用
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作者 Yun-jie Dong Zhou-fu Wang +7 位作者 Hao Liu Yan Ma Xi-tang Wang Nian Yi Zhong-feng Xia Yu-xuan Zhu Cheng-ji Deng Ling Zhang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第8期1914-1922,共9页
Magnesia-calcia refractories are widely used in the production process of clean steel due to their excellent high-tem-perature stability,slag resistance and ability to purify molten steel.However,there are still probl... Magnesia-calcia refractories are widely used in the production process of clean steel due to their excellent high-tem-perature stability,slag resistance and ability to purify molten steel.However,there are still problems such as difficult sintering and easy hydration.Magnesia-calcia materials with various calcium oxide contents were prepared by using induction sintering,and the sintering property combined with the hydration resistance of the materials was investigated.The experimental results showed that the magnesia-calcia materials prepared under induction field had higher density,microhardness and hydration resistance.In particular,the relative density of induction sintered magnesia-calcia materials with 50 mo1%CaO was greater than 98%,and the average grain size of CaO was 4.56μm,which was much larger than that of traditional sintered materials.In order to clarify the densification and microstructure evolution mechanism of the magnesia-calcia materials,the changes in temperature and magnetic field throughout the sintering process were analyzed by using finite element simulation.The results showed that the larger heating rate and higher sintering temperature under the induction sintering mode were beneficial to the rapid densification.In addition,the hot spots generated within the material due to the difference in high-temperature electric conductivity between MgO and CaO were the critical factor to realize selective sintering in MgO-CaO system,which provides a novel pathway to solve the problem of difficult sintering and control the microstructure of high-temperature composite material used in the field of high-purity steel smelting. 展开更多
关键词 Magnesia-calcia material Induction sintering Hot spot Selective sintering Density Microstructure control Hydration resistance
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