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Study on Polycrystalline Diamond for Rock Drilling Application Utilizing Shock Consolidation Technique

聚晶金刚石冲击固结技术凿岩应用研究

基本信息

批准号：
07505018
负责人：
SAWAOKA Akira
金额：
$ 9.02万
依托单位：
Materials and Structures Laboratory, Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07505018/
关键词：
Diamond Drilling bit Shock consolidation Dynamic compaction Tungsten carbide 掘削ドット

项目摘要

This project has been conducted in Fy 1995-79 as a feasibility study for industrialization of polycrystalline diamond for rock drilling application utilizing shock consolidation technique. The rock drilling bit consists of tungsten carbide alloy body and polycrystalline diamond layr, which formed by shock wave consolidation processing. The most serious problem is crack generation in the diamond layr during shock processing. Number of macro and micro cracks generated in the daiamond layr were decreased drastically by addition of silicon to diamond powder. Suitable contents of silicon is 3-7% for rock drilling bit application. Results of this study is summarized as following ;(1) Grain boundary between diamond particles in the compact was observed by high resolution electron microscope. Diamond particles are bonded with high dense from glassy carbon having Sp^3 chemical bond transformed from diamond. Very fine silicon carbide particles dispersed in the carbon layr.(2) The above boundary layr in the diamond compact has a kind of nano composite structure and it is expected a kind of mechanical toughening effect.(3) A few micron size coarse silicon carbide and graphite particles were observed in the diamond layr. these particles with comparatively large size deteriorate its mechanical property.Generation of both micron size particles is caused by lack of uniform mixing of silicon and diamond particles.(4) A plasma silicon coating technique was applied to form homogeneous coating to diamond particles with 2-4 micron. However coarse silicon particles were formed during the coating process. Industrialization of this technology is realized by development of extreme uniform coating method of silicon to diamond particles.

本项目于1995- 1979年度进行，是利用冲击固结技术实现凿岩用聚晶金刚石产业化的可行性研究。岩石钻头由碳化钨合金本体和多晶金刚石层组成，是通过冲击波固结加工形成的。最严重的问题是金刚石层在冲击加工过程中产生裂纹。在金刚石粉中加入硅后，金刚石层中产生的宏观和微观裂纹数量明显减少。硅的适宜含量为3-7%，适用于凿岩钻头。本研究结果总结如下：(1)采用高分辨电镜观察致密体中金刚石颗粒的晶界。金刚石粒子是由由金刚石转化而来的具有Sp^3化学键的玻碳高密度结合而成的。非常细小的碳化硅颗粒分散在碳层中。(2)金刚石致密体中的上述边界层具有一种纳米复合结构，有望产生一种机械增韧效果。(3)在金刚石层中观察到少量微米大小的粗碳化硅和石墨颗粒。这些颗粒尺寸较大，使其力学性能恶化。这两种微米级颗粒的产生都是由于硅和金刚石颗粒没有均匀混合造成的。(4)采用等离子体硅涂层技术，在2 ~ 4微米的金刚石颗粒表面形成均匀涂层。然而，在涂层过程中形成了粗糙的硅颗粒。该技术的产业化是通过开发极均匀的硅-金刚石颗粒涂层方法实现的。