摘要
为了提高工业金刚石的抗氧化能力，本文用ＸＲＤ、ＳＥＭ、ＤＴＡ和ＴＧＡ等方法研究了Ｔｉ、Ｍｏ、Ｗ镀层与金刚石界面反应过程、结构特征及对金刚石抗氧化性能的影响。结果表明：Ｔｉ在高于６００℃、Ｍｏ在高于６５０℃、Ｗ在高于６５０℃与金刚石界面发生固相反应，通过反应扩散过程在金刚石表面外延生长成相应的ＴｉＣ、ＭｏＣ＋Ｍｏ２Ｃ及ＷＣ＋Ｗ２Ｃ碳化物层。该致密连续的碳化物层具有较高的抗氧化能力，延缓了金刚石表面的氧化。镀Ｔｉ、Ｍｏ、Ｗ金刚石在空气中的氧化温度达９５８℃、８７１℃和８８０℃。Ｔｉ、Ｍｏ、Ｗ镀层经真空碳化处理后，抗氧化温度分别达１０２４℃、９７７℃和９８６℃。而未镀金刚石在７８０℃以上即开始氧化。
In order to improve oxidation─resistance of diamond grit,interface reaction process,composition and structure between Ti,Mo and W coating and diamonds are studied by XRD,SEM,DAT and TGA.Influence of Ti,Mo and W coating on oxidation of diamonds is investigated.Test results show that reactions between Ti,Mo and W coating and diamonds occur separately above 600, 650 and 650℃.Corresponding epitaxial TiC,Mo2C+MoC and W2C+WC films grow on diamonds surface by reaction diffusion process.These high oxidation resistant carbides films prevent diamonds from oxidation,The diamonds with Ti,Mo and W coating oxidate in air separately above 958,87l and 880℃.After these diamonds with coatings are treated in vacuum with carbon,oxidation temperature of diamonds with Ti,Mo and W coatings are separately l024,977 and 986℃.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
1996年第2期48-52,共5页
Acta Materiae Compositae Sinica
