| 摘要 |
PURPOSE:To manufacture a sintered body of high pressure phase BN having high strength, superior wear resistance and toughness by converting the material of the surfaces of high pressure phase BN particles into low pressure phase BN by treatment under temp. and pressure conditions under which high pressure phase BN is unstable, mixing the particles with binder powder, and sintering the mixture under temp. and pressure conditions under which high pressure phase BN is stable. CONSTITUTION:The material of the surfaces of high pressure phase BN (cubic BN) particles is converted into low pressure phase BN by treatment under temp. and pressure conditions under which high pressure phase BN is unstable, e.g., at about 1,300 deg.C under about 15kb pressure. The particles are then mixed with binder powder and sintered under temp. and pressure conditions under which high pressure phase BN is stable, e.g., at about 1,400 deg.C under about 50kb pressure. Powder of one or more kinds of components selected among alkali metals, alkaline earth metals, the nitrides and boronitrides of the metals, Pb, Sb, Sn and alloys of Pb, Sb and Sn is used as the binder powder.
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