| 摘要 |
PURPOSE:To obtain the title sintered form improved in toughness, hardness and mechanical strength by sintering aluminum oxide powder using a carbon- coated composite to incorporate the aluminum oxide with carbon in high dispersibility so as to continuously spreading the carbon throughout crystal grain boundaries to effect suppress grain growth. CONSTITUTION:Firstly, such composite powder that the surface of powder predominant in aluminum oxide is coated with carbon is prepared. Second, this composite powder is mixed with a substance capable of producing composite oxide by reaction with aluminum oxide followed by forming. Thence, the resultant form is sintered in a non-oxidative atmosphere to obtain the objective sintered form made up of 0.03-3wt.% of carbon and a matrix predominant in aluminum oxide. This matrix contains, other than Al and O, 0.2-40vol.%, based on the final sintered form, of composite oxides containing elements such as Sr and/or Ba. |
