| 摘要 |
A method of forming a diamond impregnated cutting structure such as a cutter insert, involves placing uniformly coated diamond particles in a mould, cold pressing the coated particles and then heating the compacted coated particles with a matrix material to form the diamond impregnated cutting structure. The matrix material can be selected from various metal carbides and nitrides. The heating step may be at between 1500 F and 2100 F and may be a high temperature, high pressure process or an isostatic pressing. The heating step may also comprise a hot-pressing process followed by a high pressure, high temperature process. Also claimed is an insert for a drill bit characterised by a thermally stable shearing portion on a diamond impregnated body, where at least one of the structures has a thermally stable coating. |
