Toward vacuum sintering of YAG transparent ceramic using divalent dopant as sintering aids
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- 英文论文题名：Toward vacuum sintering of YAG transparent ceramic using divalent dopant as sintering aids
- 论文作者：Tianyuan Zhou ; Le Zhang ; Zheng Li ; Shuai Wei ; Peng Liu ; Jian Zhang ; Hao Yang ; Hao Chen
- 英文论文作者：Tianyuan Zhou ; Le Zhang ; Zheng Li ; Shuai Wei ; Peng Liu ; Jian Zhang ; Hao Yang ; Hao Chen ; Jiangsu Key Laboratory of Advanced Laser Materials and Devices ; School of Physics and Electronic Engineering ; Jiangsu Normal University
- 年：2016
- 作者机构：Jiangsu Key Laboratory of Advanced Laser Materials and Devices,School of Physics and Electronic Engineering,Jiangsu Normal University;
- 英文论文关键词：transparent ceramic ; sintering aids ; divalent doping
- 会议召开时间：2016-07-28
- 会议录名称：2016中国功能新材料学术论坛论文集
- 语种：英文
- 分类号：TN248.1;TQ171.733
- 学会代码：ZGJS
- 会议名称：2016中国功能新材料学术论坛
- 会议地点：中国浙江宁波
- 主办单位：中国稀土学会固体科学与新材料专业委员会、中国金属学会功能材料分会、宁波市材料学会、宁波新材料产学研技术创新联盟
- 学会名称：中国金属学会
- 页数：2
- 文件大小：263k
- 原文格式：O
- 会议级别：全国
摘要
Transparent YAG ceramic has become a widespread laser gain medium for solid state lasers for many years,due to its excellent mechanical and optical properties.In order to fabricate transparent YAG ceramic with low scattering loss for laser applications,sintering aids are often applied to further promote densification as well as inhibit rapid grain growth,and tetraethyl orthosilicate(TEOS) has been proved to be an effective sintering aids for YAG ceramic[1].Nevertheless,TEOS has its intrinsic disadvantages,for example,TOES doping easily leads to dramatic grain growth,which is not benefit to the mechanical property of YAG ceramic.Also,TEOS will tremendously deteriorate the conversion efficiencies of specific doping ions like Cr~(4+)orYb~(3+) in YAG ceramics[2].We investigated the microstructure evolution of YAG ceramics sintered at different temperatures in vacuum using CaO and MgO as sintering additives without TEOS doping,as is shown in Fig.1.The average grain size of the CaO doped sample was about 1.7 urn after vacuum sintered at 1780 °C held for 4 h,and 4.5 um for MgO doped YAG ceramics.For CaO doped YAG ceramics,the relative density nearly reached to its theoretical value when the sintering temperature was higher than 1700 °C,which was 80 °C higher than that of MgO doped sample.So it is obvious that although MgO can lower sintering temperature during vacuum sintering to a large extent,but not as efficient as its CaO counterpart in the suppression of grain growth as sintering aid.
Transparent YAG ceramic has become a widespread laser gain medium for solid state lasers for many years,due to its excellent mechanical and optical properties.In order to fabricate transparent YAG ceramic with low scattering loss for laser applications,sintering aids are often applied to further promote densification as well as inhibit rapid grain growth,and tetraethyl orthosilicate(TEOS) has been proved to be an effective sintering aids for YAG ceramic[1].Nevertheless,TEOS has its intrinsic disadvantages,for example,TOES doping easily leads to dramatic grain growth,which is not benefit to the mechanical property of YAG ceramic.Also,TEOS will tremendously deteriorate the conversion efficiencies of specific doping ions like Cr~(4+)orYb~(3+) in YAG ceramics[2].We investigated the microstructure evolution of YAG ceramics sintered at different temperatures in vacuum using CaO and MgO as sintering additives without TEOS doping,as is shown in Fig.1.The average grain size of the CaO doped sample was about 1.7 urn after vacuum sintered at 1780 °C held for 4 h,and 4.5 um for MgO doped YAG ceramics.For CaO doped YAG ceramics,the relative density nearly reached to its theoretical value when the sintering temperature was higher than 1700 °C,which was 80 °C higher than that of MgO doped sample.So it is obvious that although MgO can lower sintering temperature during vacuum sintering to a large extent,but not as efficient as its CaO counterpart in the suppression of grain growth as sintering aid.
Transparent YAG ceramic has become a widespread laser gain medium for solid state lasers for many years,due to its excellent mechanical and optical properties.In order to fabricate transparent YAG ceramic with low scattering loss for laser applications,sintering aids are often applied to further promote densification as well as inhibit rapid grain growth,and tetraethyl orthosilicate(TEOS) has been proved to be an effective sintering aids for YAG ceramic[1].Nevertheless,TEOS has its intrinsic disadvantages,for example,TOES doping easily leads to dramatic grain growth,which is not benefit to the mechanical property of YAG ceramic.Also,TEOS will tremendously deteriorate the conversion efficiencies of specific doping ions like Cr~(4+)orYb~(3+) in YAG ceramics[2].We investigated the microstructure evolution of YAG ceramics sintered at different temperatures in vacuum using CaO and MgO as sintering additives without TEOS doping,as is shown in Fig.1.The average grain size of the CaO doped sample was about 1.7 urn after vacuum sintered at 1780 °C held for 4 h,and 4.5 um for MgO doped YAG ceramics.For CaO doped YAG ceramics,the relative density nearly reached to its theoretical value when the sintering temperature was higher than 1700 °C,which was 80 °C higher than that of MgO doped sample.So it is obvious that although MgO can lower sintering temperature during vacuum sintering to a large extent,but not as efficient as its CaO counterpart in the suppression of grain growth as sintering aid.
引文
[1]H.Yang,X.Qin,J.Zhang,S.Wang,J.Ma,L.Wang,and Q.Zhang,J Alloy Compd.509(2011)52745279.
[2]T.Zhou,L.Zhang,H.Yang,X.Qiao,P.Liu,D.Tang,and J.Zhang,J Am Ceram Soc,98(2015)24592464.
[2]T.Zhou,L.Zhang,H.Yang,X.Qiao,P.Liu,D.Tang,and J.Zhang,J Am Ceram Soc,98(2015)24592464.