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Study on Termo-Chemical Wear Mechanism of Diamond and Its Application to High Efficiency Polishing

金刚石热化学磨损机理研究及其在高效抛光中的应用

基本信息

批准号：
05650117
负责人：
SHIMADA Shoichi
金额：
$ 1.41万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650117/
关键词：
Diamond Diamond tool Tool.wear Thermo-chemical wear Wear Process Thermodynamics Quantum chemistry

项目摘要

Thermo-chemical process is considered to be an essential mechanism of wear of diamond cutting edge in ultraprecision metal cutting, because the cutting edge under attritious contact with workmaterial is inevitably subject to elevated temperature. To understand the wear mechanism, the simplified experiments simulating the wear process of cutting edge are carried out. Analyzes on the behavior of chemical reaction between diamond and metal are also made based on the thermodynamics and first principal quantum calculation. The results of the experiments and analyzes show that the thermo-chemical wear by oxidation on the diamond surface contacting with a metal is predominant process when it is heated under the temperature that the metal can be oxidized and also the metal oxide can be deoxidized by diamond. The wear of diamond is also accelerated carbonization of the contacting metal or the diffusion of carbon atoms on diamond surface into the metal. Using the termodynamics analyzes, the conditions on temperature and oxygen partial pressure under which the diamond shows termo-chemical wear can be predicted. Based on the first principal calculation, the wear processes of diamond due to oxidation and carbonization can be well understood. The wear control of diamond tool seems to be difficult under the condition of realistic atmosphere attainable. However, the application of thermo-chemical process seems to be useful for the high efficiency polishing of diamond.

在超精密切削中，由于切削刃与被切削材料的摩擦接触不可避免地要承受高温，因此热化学过程被认为是金刚石切削刃磨损的一个重要机理。为了解其磨损机理，进行了模拟切削刃磨损过程的简化试验。从热力学和第一主量子计算的角度分析了金刚石与金属的化学反应行为。实验和分析结果表明，在金刚石既能氧化金属又能还原金属氧化物的温度下，金刚石与金属接触表面的热化学磨损以氧化磨损为主。金刚石的磨损也是由于接触金属加速碳化或金刚石表面碳原子向金属中扩散。通过热力学分析，可以预测金刚石发生热化学磨损的温度和氧分压条件。基于第一原理计算，可以很好地理解金刚石的氧化和碳化磨损过程。金刚石工具的磨损控制在现实大气条件下似乎是困难的。然而，热化学过程的应用似乎是有用的高效抛光的金刚石。