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Super-hard bits, super-hard tips for same, tools comprising same and methods for making same
Super-hard bits, super-hard tips for same, tools comprising same and methods for making same
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机译:超硬钻头,用于超硬钻头的超硬刀头,包括其的工具及其制造方法
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摘要
A super-hard (PCD) bit for a tool, having a super-hard volume 102, substrate 112 and support body 120, where the super-hard volume is sinter-joined to a distal end of the substrate and a proximal end 117 of the substrate joined to the support body. A substrate side 113 connects the proximal and distal ends of the substrate, and where the proximal and distal ends of the substrate each having a respective proximal 113 and distal 101 peripheral edge. The proximal and distal peripheral edges define a respective proximal and distal circumscribing circle in which the substrate side includes a divergent area that diverges from the distal end towards the proximal end. The substrate is such that the diameter D2 of the proximal circumscribing circle is greater than the diameter D2 of the distal circumscribing circle. In an alternative embodiment a method of making super-hard tip involves forming a precursor aggregation having super-hard material grains against the distal end to form a pre-sinter assembly and having a density of at least 60% the density of the super-hard material. The pre-sinter assembly is placed in a capsule for an ultra-high pressure, high temperature (HPHT) press and subjected to an HPHT condition.
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