| 摘要 |
<P>PROBLEM TO BE SOLVED: To synthesize a heat-shrinkable ceramic which has a size and a density comparable to or larger than those obtained through press-molding, without press-molding a precursor powder. <P>SOLUTION: In the process for synthesizing the heat-shrinkable ceramic, Zr(<SB>1-x)</SB>X<SB>x</SB>W<SB>2</SB>O<SB>8</SB>(wherein X is an element substituting for Zr; and 0≤X<<1) having a negative coefficient of thermal expansion is synthesized. A raw material, prepared by mixing zirconium oxide ZrO<SB>2</SB>and a substitutional element X corresponding to the substitution rate x are mixed with tungsten trioxide WO<SB>3</SB>in a stoichiometric ratio yielding a molar ratio of WO<SB>3</SB>to the total of ZrO<SB>2</SB>and X of 2, is pulverized into a powder having a bipolar particle size distribution comprising small particles with a particle size of 0.1-1 μm and large particles with a particle size of 5-50 μm. The obtained precursor powder is mixed, introducted into a desired mold and sintered. <P>COPYRIGHT: (C)2004,JPO |
