Method of surface modification for thermal shock resistance and a member thereof

Abstract

A method for improving surface thermal shock resistance of a member made of ceramics to which thermal shock resistance is required comprising, forming homogeneously distributed linear dislocation structure on the surface of the member made of ceramics to which thermal shock resistance is required by blasting abrasives composed of fine particles whose average particle size is from 5 μm to 200 μm and whose surface shape is convex, wherein Vickers hardness (HV) of said fine particles is 800 or more and equal to or less than the hardness of the member made of ceramics to which thermal shock resistance is required.

1 . A method for improving surface thermal shock resistance of a member made of ceramics to which thermal shock resistance is required comprising, forming homogeneously distributed linear dislocation structure on the surface of the member made of ceramics to which thermal shock resistance is required by blasting abrasives composed of fine particles whose average particle size is from 5 μm to 200 μm and whose surface shape is convex, wherein Vickers hardness (HV) of said fine particles is 800 or more and equal to or less than the hardness of the member made of ceramics to which thermal shock resistance is required wherein the homogeneously distributed linear dislocation on the surface of the member made of ceramics to which thermal shock resistance is required forms a dislocation structure whose dislocation density is measured with the transmission electron microscope and is from 1×10 4  to 9×10 13  cm −2 . 
     
     
         2 . (canceled) 
     
     
         3 . The method for improving surface thermal shock resistance of a member made of ceramics to which thermal shock resistance is required of  claim 1 , wherein working using blasting abrasives is carried out by blasting pressure; 0.1-1.0 MPa, blasting rate; 20 m/sec-250 m/sec, blasting amount; 50 g/min-800 g/min, blasting time; 1 sec/cm 2 -60 sec/cm 2 . 
     
     
         4 . The method for improving surface thermal shock resistance of a member made of ceramics to which thermal shock resistance is required of  claim 3 , wherein the homogeneously distributed linear dislocation on the surface of the member made of ceramics to which thermal shock resistance is required forms a dislocation structure whose dislocation density is measured with the transmission electron microscope and is from 1×10 4  to 9×10 13  cm −2 . 
     
     
         5 . (canceled) 
     
     
         6 . (canceled)