钻石
微观结构
化学
微晶
聚晶金刚石
金刚石材料性能
粒度
复合材料
化学气相沉积
晶粒生长
结晶学
晶界
材料科学
作者
Minoru Akaishi,Toshikazu Ohsawa,Shinobu Yamaoka
出处
期刊:ChemInform
[Wiley]
日期:1991-04-16
卷期号:22 (15)
标识
DOI:10.1002/chin.199115297
摘要
Sintering of a fine-grained polycrystalline diamond compact with grains less than 1 μm in size was successfully carried out by making a laminate on a WC/Co powder compact under sintering conditions of 5.8 GPa and 1430° to 1480°C for 30 min, in which small amounts of poly(ethylene glycol) and fine powder of cubic boron nitride were added to the starting diamond powder. The former played the role of preventing agglomeration of the diamond powder and the latter of suppressing abnormal grain growth during sintering. Microstructural observation of the polycrystalline diamond showed that in the regions near the WC/Co layer a comparatively large amount of Co metal was present between diamond grains, but in other regions the amount of Co decreased, and the diamond grains were seen to be bonded strongly. The Vickers hardness of the polycrystalline diamond was 55 ± 5 GPa with 19.6 N load.
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