The samples were attained through altering the cooling system of producing glass-ceramics.The X-ray diffraction was used to test the stress value of different samples.The relation of the cooling system and internal st...The samples were attained through altering the cooling system of producing glass-ceramics.The X-ray diffraction was used to test the stress value of different samples.The relation of the cooling system and internal stress were also investigated.The experimental results show that the stress of glass-ceramic had a close relation with starting cool temperature.Above 800~C,glass-ceramic could be accelerated cooling and did not bring stress.Temperature between 500℃and 800℃was an important temperature range of the formation of stress in glass-ceramic,in which the glass-ceramic stress would change obviously.Cool system was the key on how to control and eliminate internal stress in order to reduce the destroy of materials crated by internal stress.In addition,glass particles size increase,glass-ceramic stress increase in consequent.展开更多
The sintering characteristics at 1350℃ and leaching property at 80℃ of calcium aluminate clinkers in the CaO-Al2O3-SiO2 (C-A-S) system with different additions of FeO and Fe2O3 were investigated. FeO inhibits the ...The sintering characteristics at 1350℃ and leaching property at 80℃ of calcium aluminate clinkers in the CaO-Al2O3-SiO2 (C-A-S) system with different additions of FeO and Fe2O3 were investigated. FeO inhibits the conversion of β-Ca2SiO4 to γ-Ca2SiO4 and makes the clinker not pulverizable. FeO and Fe2O3 inhibit the formation of CaAl2O4, but promote the formation of Ca12Al14O33. The interplanar spacing at (2 1 1) crystal face of Ca12 Al14O33 in the clinker increases with the increase of FeO addition, which indicates that FeO forms solid solutions in Ca12Al14O33. The clinkers with Fe2O3 addition form a new phase Ca2Fe2O5, and the amount of Ca2Fe2o5 increases with the in crease of Fe2O3 addition. Both FeO and Fe2O3 do not affect the Al2O3 leaching rate of calcium aluminate clinker in sodium carbonate solution, but they increase the molar ratio of caustic Na2O to Al2O3 in the leached liquor.展开更多
A near infrared to visible blue, green, and red upconversion luminescence in a Tb^3+-doped CaO-Al2O3-SiO2 glass was studied, which was excited using 800 nm femtosecond laser irradiation. The upconversion luminescence...A near infrared to visible blue, green, and red upconversion luminescence in a Tb^3+-doped CaO-Al2O3-SiO2 glass was studied, which was excited using 800 nm femtosecond laser irradiation. The upconversion luminescence was attributed to ^5D3→^7F5, ^5D3→^7F4, ^5D3→^7F3, ^5D4→^7F6, ^5D4→^7F5, ^5D4→^7F4, and ^5D4→^7F3 transitions of Tb^3+. The relationship between upconversion luminescence intensity and the pump power indicated that a three-photon simultaneous absorption process was dominant in this upconversion luminescence. The intense red, green, and blue upconversion luminescence of Tb^3+-doped CaO-Al2O3-SiO2 glass may be potentially useful in developing three-dimensional display applications.展开更多
基金National Natural Science Foundation of China(50272043)Natural Science Foundation of Hubei Province(2002AB077)+1 种基金Natural Science Foundation of Wuhan University of Technology(2003XJJ013)Natural Science Foundation of Key Laboratory of Silicate Materials Science and Engineering of Ministry of Education,Wuhan University of Technology
摘要The samples were attained through altering the cooling system of producing glass-ceramics.The X-ray diffraction was used to test the stress value of different samples.The relation of the cooling system and internal stress were also investigated.The experimental results show that the stress of glass-ceramic had a close relation with starting cool temperature.Above 800~C,glass-ceramic could be accelerated cooling and did not bring stress.Temperature between 500℃and 800℃was an important temperature range of the formation of stress in glass-ceramic,in which the glass-ceramic stress would change obviously.Cool system was the key on how to control and eliminate internal stress in order to reduce the destroy of materials crated by internal stress.In addition,glass particles size increase,glass-ceramic stress increase in consequent.
基金Item Sponsored by National Natural Science Foundation of China(51174054,51104041,51374065)
摘要The sintering characteristics at 1350℃ and leaching property at 80℃ of calcium aluminate clinkers in the CaO-Al2O3-SiO2 (C-A-S) system with different additions of FeO and Fe2O3 were investigated. FeO inhibits the conversion of β-Ca2SiO4 to γ-Ca2SiO4 and makes the clinker not pulverizable. FeO and Fe2O3 inhibit the formation of CaAl2O4, but promote the formation of Ca12Al14O33. The interplanar spacing at (2 1 1) crystal face of Ca12 Al14O33 in the clinker increases with the increase of FeO addition, which indicates that FeO forms solid solutions in Ca12Al14O33. The clinkers with Fe2O3 addition form a new phase Ca2Fe2O5, and the amount of Ca2Fe2o5 increases with the in crease of Fe2O3 addition. Both FeO and Fe2O3 do not affect the Al2O3 leaching rate of calcium aluminate clinker in sodium carbonate solution, but they increase the molar ratio of caustic Na2O to Al2O3 in the leached liquor.
基金supported by the Education Department of Zhejiang Province (20050359)
摘要A near infrared to visible blue, green, and red upconversion luminescence in a Tb^3+-doped CaO-Al2O3-SiO2 glass was studied, which was excited using 800 nm femtosecond laser irradiation. The upconversion luminescence was attributed to ^5D3→^7F5, ^5D3→^7F4, ^5D3→^7F3, ^5D4→^7F6, ^5D4→^7F5, ^5D4→^7F4, and ^5D4→^7F3 transitions of Tb^3+. The relationship between upconversion luminescence intensity and the pump power indicated that a three-photon simultaneous absorption process was dominant in this upconversion luminescence. The intense red, green, and blue upconversion luminescence of Tb^3+-doped CaO-Al2O3-SiO2 glass may be potentially useful in developing three-dimensional display applications.