原位生成陶瓷相结合Ti(C,N)复合材料及其性能研究  

In-situ formed ceramic bonded Ti(C,N)composites and their properties

作　　者：邹起良 邓承继[1] 董博 丁军[1] 朱万政 王周福[1] 祝洪喜[1] 王琳 余超[1] Zou Qiliang;Deng Chengji;Dong Bo;Ding Jun;Zhu Wanzheng;Wang Zhoufu;Zhu Hongxi;Wang Lin;Yu Chao(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;不详)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]天津炜润达新材料科技有限公司,天津301800 [3]安徽省萧县华龙耐火材料有限责任公司,安徽宿州110819

出　　处：《耐火材料》2023年第2期93-98,共6页Refractories

基　　金：国家自然科学基金联合基金项目(U21A2057);湖北省重点研发计划项目(2021BAD002)。

摘　　要：以TiO_(2)粉、鳞片石墨和Si粉为原料,采用碳热还原氮化法在1450℃保温2 h制备了陶瓷相结合Ti(C,N)复合材料。研究了Si粉加入量(加入质量分数分别为0、5%、15%、25%)对材料物相组成、显微结构、物理性能及抗氧化性的影响。结果表明:适量Si粉的引入有利于细化Ti(C,N)晶粒,提高Ti(C,N)复合材料的常温力学性能与抗氧化性。当Si粉加入量为5%(w)时,原位生成陶瓷相结合Ti(C,N)复合材料的综合性能较优,其显气孔率、常温抗折强度和常温弹性模量分别约为(38.8±1.6)%、(62.5±2.4)MPa及(59.6±2.2)GPa。随Si粉加入量(w)进一步增加至15%或25%,复合材料的体积密度和力学性能下降。Ceramic bonded Ti(C,N)composites were prepared by carbothermal reduction nitridation at 1450℃for 2 h using TiO_(2) powder,flake graphite and Si powder as raw materials.The effects of the Si powder addition(0%,5%,15%,and 25%,by mass)on the phase composition,the microstructure,the physical properties,and the oxidation resistance of the material were investigated.The results show that the appropriate addition of Si powder refines the Ti(C,N)grains and improves the cold mechanical properties and the oxidation resistance of Ti(C,N)composites.The in-situ formed ceramic bonded Ti(C,N)composite with 5%Si powder has the optimal comprehensive properties,with the apparent porosity of(38.8±1.6)%,the cold modulus of rupture of(62.5±2.4)MPa,and the cold elastic modulus of(59.6±2.2)GPa.When the Si powder addition increases to 15%or 25%,the bulk density and the mechanical properties of the composite decrease.

关 键 词：Ti(C N)复合材料 原位生成 SI粉 碳热还原氮化 力学性能 

分 类 号：TQ175[化学工程—硅酸盐工业]