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现代世界上先进的岩芯钻探,主要是使用金刚石钻头伴同硬质合金钻头钻进各种岩石,间或配用冲击回转钻具,加快钻进速度,统称金刚石岩芯钻探.所用金刚石钻头,有天然金刚石钻头和人造金刚石钻头.后者是新近发展起来的一项新技术. 据有关资料记载,天然金刚石钻头应用于钻探生产已有一百多年的历史.1862年瑞典制造出第一个天然金刚石钻头,这是用手工铆镶的大颗粒天然金刚石钻头,金刚石粒度为1～2颗/克拉.这样的钻头一直延用了七十多年.由于大颗粒天然金刚石产量有限,价值昂贵,一些发达的资本主义国家于1936至1937年,开始采用粉末冶金法制造表镶天然金刚石钻头,金刚石粒度小到135～47颗/克拉.1940至1945年间,欧洲的一些国家开始研究采用小于46目的细粒廉价天然金刚石制造孕镶金刚石钻头.随着工业的发展,天然金刚石越来越满足不了日益增长的需要,为了解决金刚石
In the modern world, advanced core drilling mainly uses diamond bits with hard alloy bits to drill various rocks, or use impact rotary drilling tools to speed up the drilling, collectively referred to as diamond core drilling. The diamond bits used are natural Diamond bits and synthetic diamond bits, a newly developed technology that has been used for more than 100 years in the production of natural diamond bits, the first of which was made in Sweden in 1862 Drill bit, which is hand-riveted large particles of natural diamond drill, the diamond particle size of 1 ~ 2 / carat. Such a drill has been extended with more than seventy years. Due to the limited production of large particles of natural diamond, the value of some well-developed Of the capitalist countries started to use powder metallurgy from 1936 to 1937. The diamond grains were as small as 135 to 47 grains per carat from 1940 to 1945. Some countries in Europe started to study the use of fine grains smaller than 46 mesh Cheap natural diamond manufacturing impregnated diamond bits. With industrial development, natural diamonds can not meet the growing demand for To solve the diamond