Structure and characteristics of Si-coated diamond grits
- 出版年：2005
- 作者：Lu Jing；Wang Yanhui；Qi Xuehai；Huang Hao；Zang Jianbing
- 单位1：Key Laboratory ofMetastable Materials Science Technology
- 出生年：1981
- 学历：postgraduate student
- 语种：英文
- 作者关键词：Diamond；Silicon films；Atomic layer deposition（ALD）
- 起始页：13
- 总页数：3
- 经费资助：Supported by National Natural Science Foundation of China（50372056），Natural Science Foundation of Hebei Province（503263）and Hebei Education Department（B2004524）.
- 刊名：金刚石与磨料磨具工程
- 是否内版：否
- 刊频：双月刊
- 主办单位：郑州磨料磨具磨削研究所
- 主编：王琴
- 地址：郑州市华山路121号
- 邮编：450007
- 电子信箱：diamond@371.net
- 期：6
- 期刊索取号：P666.06 836
- 数据库收录：全国中文核心期刊；中国科技论文统计源期刊；Ei收录用刊；CA收录用刊
- 核心期刊：全国中文核心期刊
摘要
During sintering process of diamond tools，metal bond containing graphitizing elements such as Fe，Co，Ni seriously e-rodes diamond grits，which reduces the strength of the diamond grits.In this paper，silicon films were coated on the surface of dia-mond grits by means of atomic layer deposition（ ALD） from gaseous SiH4.Fourier transform infrared （FTIR） spectra，X-ray dif- fraction（XRD） and Atomic force microscopy（AFM） were utilized to analyze the structure and the morphology of Si-coated dia-mond respectively.The results suggested that the film was cubic-phase polycrystalline silicon and the surface of thefilm was smoothand continuous. According with the adsorption mechanism of SiH4 on the surface of diamond grits，the stretching and bending modes of SiH2 and SiH3 both existed.Differentjal thermal analysis（DTA） was used to compare the thermal stability of coated dia-mond and uncoated diamond.Owning to the protection of silicon films the starting oxidation temperature of coated diamond reachedas high as 920°C，which was much higher than that of uncoated diamond. Bending experiment was conducted to measure the ben-ding strength of Fe-Cu-Sn-Ni based metal bond diamond blade. In comparison with uncoated diamond，the bending strength of Si-coated diamond blade increased by 16.2%，scan electron microscope（SEM） observation of the blade fracture revealed that the de-posited silicon films not only protected the diamond grits from erosion during sintering process but also realized the strong bindingbetween the diamond grits and the bond.