摘要
为探究稀土氧化物对Ti(C,N)复合材料性能的影响,以TiO_(2)粉、石墨粉和Si粉为原料,Y_(2)O_(3)粉为烧结助剂,采用碳热还原氮化法经1600℃高温烧成制备氧化物结合Ti(C,N)材料。研究Y_(2)O_(3)添加量(加入质量分数分别为1%、2%、4%)对Ti(C,N)复合材料物相组成、显微形貌及物理性能的影响。结果表明,高温烧后试样的主物相均为Ti(C,N)、Ti_(3)O_(5)、α-石英及Y_(2)Si_(2)O_(7)。随Y_(2)O_(3)添加量的增大,试样中液相生成量增多,使Ti(C,N)晶粒粗化,Y_(2)Si_(2)O_(7)物相分布不均匀,试样的力学性能受损。当Y_(2)O_(3)添加量(w)为1%时,Ti(C,N)晶粒的平均尺寸约为0.76μm,复合材料具有较高致密度及优异的力学性能,其显气孔率、常温抗折强度和弹性模量分别为0.8%、242.2 MPa和230.3 GPa。
To investigate the effect of rare earth oxides on the properties of Ti(C,N)composites,oxide-bonded Ti(C,N)materials were prepared by carbothermal reduction nitridation at 1600℃using TiO_(2)powder,graphite powder and Si powder as raw materials,and Y_(2)O_(3)powder as sintering aids.The effect of the Y_(2)O_(3)addition(1%,2%,and 4%,by mass)on the phase composition,microstructure,and physical properties of the Ti(C,N)composites was investigated.The results show that the primary phases in the samples after high-temperature firing are Ti(C,N),Ti_(3)O_(5),α-quartz,and Y_(2)Si_(2)O_(7).As the Y_(2)O_(3)addition increases,there is a corresponding rise in the production of the liquid phase within the specimens,resulting in coarsening of Ti(C,N)grains and non-uniform distribution of Y_(2)Si_(2)O_(7),ultimately leading to a degradation in the mechanical properties of the specimens.When the Y_(2)O_(3)addition is 1%,the average size of Ti(C,N)grains is approximately 0.76μm,the composite exhibits high density and excellent mechanical properties,with the apparent porosity of 0.8%,cold modulus of rupture of 242.2 MPa,and elastic modulus of 230.3 GPa.
作者
程旭
邓承继
董博
邹起良
丁军
王周福
朱万政
肖语嫣
祝洪喜
余超
Cheng Xu;Deng Chengji;Dong Bo;Zou Qiliang;Ding Jun;Wang Zhoufu;Zhu Wanzheng;Xiao Yuyan;Zhu Hongxi;Yu Chao(不详;The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)
出处
《耐火材料》
CAS
北大核心
2024年第3期195-198,共4页
Refractories
基金
湖北省重点研发计划(2023BAB106)
国家自然科学基金联合基金项目(U21A2057)。
