Effects of Rare Earth Oxides on Microstructures and Properties of Mag nesia Refractories

摘要：

　　The effects of Y2O3,La2O3 and Nd2O3 on the sintering,microstructure and mechanical properties of magnesia refractories were investigated.Addition of rare earth oxide (ReO) to magnesia refractories increases the bulk density,decreases the porosity and improves the mechanical strength of the refractories.The improved sinterability was attributable to the vacancies generation associated with the solid-solution reactions between MgO and ReO.In the samples with ReO,rare earth silicate phases form at magnesia grain boundaries,providing additional bonding between magnesia grains and between magnesia grains and matrix.Consequently,the samples with ReO showed much higher high temperature strengths than those without ReO.

关键词： Magnesia refractory Rare earth oxides Sintering Microstructure

作者: Zhang Baoguo Wang Zhoufu Zhang Shaowei Wang Xitang Xu Ziwei

作者单位: Hubei Province Key Laboratory of Ceramics and Refractories,Wuhan University of Science and Technology,Wuhan 430081,China

会议类型: 国际会议

会议名称: The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))

会议地点: 长沙

会议语种:英文

页码: 1158-1160

在线出版日期: 2007-05-10（万方平台首次上网日期，不代表论文的发表时间）