| CPC C01F 17/218 (2020.01) [C09C 3/006 (2013.01); C09C 3/041 (2013.01); C09C 3/045 (2013.01); C09C 3/046 (2013.01); C09C 3/10 (2013.01); C01P 2004/50 (2013.01); C01P 2006/60 (2013.01)] | 5 Claims |
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1. A method for producing transparent ceramics, the method comprising the steps of:
obtaining a candidate composition containing a binder, and at least one of a dispersant and a plasticizer;
dissolving the candidate composition in a solvent, then reducing a contained solvent volume to 0.1% by mass or less, and measuring a glass transition temperature;
selecting the candidate composition as an organic additive composition if the candidate composition has a glass transition temperature of 25° C. or more and 60° C. or less;
preparing the organic additive composition containing the binder, and at least one of the dispersant and the plasticizer, and having the composition obtained in the selecting step;
pulverizing a raw material for sintering formed from metal oxide powder and the organic additive composition to obtain a pulverized mixture, wherein the mass of the binder in the organic additive composition is 0.5 to 2 parts by mass when the mass of the metal oxide powder is set to be 100 parts by mass;
granulating the pulverized mixture;
sintering the granulated mixture to obtain a sintered body;
pressurizing the sintered body, wherein the pressurized, sintered body does not contain any bubble defects having a size of 30 μm to 1000 μm; and
wherein the binder comprises one of the following:
a) a vinyl acetate-vinyl alcohol copolymer,
b) a vinyl butyral-vinyl acetate-vinyl alcohol copolymer containing polyvinyl butyral as a main component,
c) hydroxypropylmethylcellulose, or
d) an ethylene-vinyl acetate copolymer.
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