| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a diamond sintered compact block with high precision and in a high yield, used for anvils for research under an ultrahigh pressure, forming dies for hard materials and component materials of cutting tools such as a glass-fiber cutter and a scriber. SOLUTION: This method comprises; (1) preparing a forming die 11, 12 composed of a heat-resisting material and having, in its inside, a cavity of a solid form in which, between the maximum length (axial length) in a pressing direction and the maximum size (cross-sectional length) perpendicular to the pressing direction, the smaller dimension is >=10 mm and the larger dimension is >=20 mm; (2) constituting starting materials in the form of a powder mixture 17 containing super-abrasive powder and binder raw-material powder; (3) charging the starting materials into the above forming die, closing the opening of the die, and arranging heaters for electric heating around the die; (4) charging the whole into a uniaxial press and adjusting the central axis of the forming die to the pressing direction; (5) subjecting the starting materials to pressure/temperature conditions within a region where the super abrasives are thermodynamically stable to integrally sinter the starting materials; and (6) carrying out cooling and pressure release and then recovering the resultant sintered-compact block.
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