Sintered ceramic articles and method for production thereof
AssigneeKabushiki Kaisha Toshiba
InventorsMichiyasu Komatsu, Isao Ikeda
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Abstract
Sintered ceramic articles and a method for the production thereof are disclosed. When a shaped Si.sub.3 N.sub.4 ceramic article is sintered in the presence of SiO.sub.2 or a SiO.sub.2 -containing substance in an inactive gas atmosphere, there is obtained a sintered ceramic article having the surface thereof coated with a thin layer formed preponderantly of silicon oxynitride (Si.sub.2 N.sub.2 O). The sintered ceramic article of this invention excels in resistance to elevated temperatures, particularly temperatures exceeding 1200.degree. C., and enjoys a good surface condition.
Claims2
A sintered ceramic article having a smooth, thin reaction-formed surface layer preponderantly of silicon oxynitride (Si.sub.2 N.sub.2 O) formed on a surface of a sintered Si.sub.3 N.sub.4 article having a density of 3.0 gr/cm.sup.3 or more, said silicon oxynitride being a reaction product of SiO.sub.2 and Si.sub.3 N.sub.4 of said sintered article.
Dependencies are inferred from the claim text.