Method of toughening and modifying ceramic and ceramic products
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United States of America Patent
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Apr 26, 2005
Grant Date -
Aug 28, 2003
app pub date -
Mar 20, 2003
filing date -
Sep 21, 2000
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Abstract
When a sintered body of ceramic is shot-blasted at normal temperatures to plastically deform the crystal structure of the shot-blasted surface to apply residual stress and is heat-treated to recrystallize fine cracks, dislocated cells in the grain boundary are formed, crystals are finely divided, and the fracture toughness is significantly improved. When the sintered body of ceramic is a thin product, an effective toughening can be attained by shot blasting both the front and back sides. After heat treatment, mechanical strength is significantly improved by removing a part of the modified surface layer by an abrasion treatment.
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