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AssigneesAgency of Industrial Science and Technology, Ministry of International Trade & Industry
InventorsHideyo Tabata, Yoshitaka Kuwahara, Michihide Machida, Shyoichi Kume, Takeo Iga, Kazuo Saitoh, Shinji Tomura
Estimating the term…
A high-strength sintered article of chemical substances having the .beta.-silicon nitride type crystal structure is produced by blending 50 to 99.9 weight percent of a .beta.-silicon nitride and/or .beta.'-Sialon and 50 to 0.1 weight percent of a mixture, as a sintering aid, consisting of BeO, Ga.sub.2 O.sub.3, and Al.sub.2 O.sub.3 in respective amounts such as to have a Ga.sub.2 O.sub.3 /BeO ratio in the range of from 2.8 to 9.4, an Al.sub.2 O.sub.3 /BeO ratio in the range of from 0.0 to 2.6, and an Al.sub.2 O.sub.3 /Ga.sub.2 O.sub.3 ratio in the range of from 0.0 to 1.1, all ratios being ratios by weight and sintering the resultant blend.
A method for the manufacture of a high-strength sintered article of .beta.-silicon nitride composition, which comprises blending 50 to 99.9 wt. % of a composition which, on being burned, acquires the structure of .beta.-silicon nitride composition with 50 to 0.1 wt % of a mixture, as a sintering aid, consisting of BeO, Ga.sub.2 O.sub.3, and Al.sub.2 O.sub.3 of respective amounts such as to have a Ga.sub.2 O.sub.3 /BeO ratio in the range of from 2.8 to 9.4, an Al.sub.2 O.sub.3 /BeO ratio in the range of from 0.0 to 2.6, and an Al.sub.2 O.sub.3 /Ga.sub.2 O.sub.3 ratio in the range of from 0.0 to 1.1, all ratios being ratios by weight, molding the resultant blend, and sintering the molded blend at a temperature in the range of from 1300.degree. to 1850.degree. C.
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