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一、概述根据德比尔斯工业金刚石公司的理查德·沙夫特博士分析,热稳定的多晶金刚石钻头旋转凿岩对勘探岩芯的钻进,可能具有与镶嵌式细粒金刚石钻头相同的影响。新式的多晶金刚石钻头钻进速度为镶嵌式金刚石钻头的3～4倍,并能持续钻进。在抗压强度为240兆帕坚硬的南非辉长岩中钻孔时,钻进速度可达600毫米/分,孔深超过16米。多晶金刚石是将微米级的人造金刚石置于碳化钨基体上,在大约1500℃温度和60千巴压力下经烧结而成的。在烧结过程中,碳化钨基体中的钴转移到金刚石相内,催化形成多品金刚石。这一过程只能在高压下发
I. Overview According to Dr Richard Schafft of the De Beers Industrial Diamond Company, the drilling of a prospecting core by a thermally stabilized polycrystalline diamond bit rotary drill may have the same dimensions as a mosaic type fine diamond bit influences. New polycrystalline diamond drill bit drilling speed of 3 to 4 times the embedded diamond drill, and can continue drilling. Drilling speeds up to 600 mm / min and drilling depths of more than 16 m were drilled in the South African gabbro at a compressive strength of 240 MPa. Polycrystalline diamond is made by placing micrometer-sized synthetic diamond on a tungsten carbide substrate sintered at a temperature of about 1500C and a pressure of 60kbar. During the sintering process, the cobalt in the tungsten carbide matrix is transferred into the diamond phase and catalyzes the formation of multi-product diamond. This process can only be issued under high pressure