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Two types of soft solution preparation methods were investigated for the production of zirconia in the presence of alumina or yttria from mixed aqueous solution of zirconyl chloride and aluminum or yttrium chloride. Tetragonal zirconia powder was obtained below 1000 o C by firing the mixed solution gel, which was prepared by adding citric acid. The particle size distribution was much narrower...
Dense sintered composites of ZrO 2 (2 mol% Y 2 O 3 ) and WSi 2 have been fabricated by hot isostatic pressing for 2 h at 1500°C under 196 MPa. They contain a small amount of W 5 Si 3 ; during sintering, WSi 2 decomposes into W 5 Si 3 and amorphous Si. The ZrO 2 particles in the composites consist of only t-ZrO 2 ...
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