SURFACE TOUGHENING METHOD OF BRITTLE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a method for improving surface toughening properties of a brittle crystalline material by accumulating lattice defects such as sub- boundaries (dislocations) together with deformation in the crystal of the brittle crystalline material. ;SOLUTION: This surface toughening method for a brittle material is to strike an indenter, or the like, into the surface of the brittle crystalline material at room temperature, e.g. to strike minute impressions each having a groove width of 0.001-1 μm into the surface of the brittle crystalline material at room temperature by means of a Vickers hardness tester with an apical wide angle of 136o in a number density of 500-10,000/mm2 under a load of 100-500 g, and then to perform simple annealing (healing or annealing) in an atmosphere at a temperature not lower than 0.5 TM, and not higher than TM (wherein TM is the absolute temperature of the melting point) in such a way that the impressions substantially disappear and dislocation sub-boundaries are introduced at the same time.;COPYRIGHT: (C)2001,JPO