Method of toughening and modifying ceramic and ceramic products
AssigneesSintokogio, Ltd., Sinto V-Cerax, Ltd., Hiroyasu Saka
InventorsHiroyasu Saka, Syoji Uchimura, Hideki Morimitsu
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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.
Claims12
A method of toughening and modifying ceramic comprising a step of applying residual stress to a sintered body of ceramic by a shot-blasting treatment, a step of heat-treating the resulting sintered body to recrystallize it, and a step of removing a part of a modified surface layer having dislocated cells resulting from the two preceding steps.
A method of toughening and modifying ceramic comprising (a) a step of applying residual stress to a sintered body of ceramic by a shot-blasting treatment, (b) a step of heat-treating the sintered body treated by step (a) to recrystallize ceramic near fine cracks, and (c) a step of removing a part of a modified surface layer having dislocated cells of the sintered body of ceramic heat-treated by step (b).
A method of toughening and modifying ceramic comprising (a) a step of applying residual stress or of introducing a cell defect to a sintered body of ceramic by a shot-blasting treatment, (b) a step of heat-treating the sintered body treated by step (a) to recrystallize a part of ceramic near fine cracks to form a sub-boundary, and (c) a step of removing a part of a modified surface layer having dislocated cells of the sintered body of ceramic heat-treated by step (b).
A method of toughening and modifying ceramic comprising (a) a step of applying residual stress to a sintered body of ceramic by a shot-blasting treatment with fine particles having an average particle diameter of 100 μm or less, and (b) a step of heat treating the sintered body treated by step (a) to recrystallize a part of ceramic near fine cracks generated by the shot-blasting treatment.
A method of toughening and modifying ceramic characterized by comprising (a) a step of applying residual stress or of introducing a cell defect to a sintered body of ceramic by a shot-blasting treatment with fine particles having an average particle diameter of 100 μm or less, and (b) a step of heat-treating the sintered body treated by step (a) to recrystallize a part of ceramic near fine cracks generated by the shot-blasting treatment to form a sub-boundary.
Dependencies are inferred from the claim text.