コロイダルフィルトレーション成形法によるムライト/ジルコニアセラミックスの調製と評価

概要

論文の詳細を見る
Processing of mullite and mullite/ 4Y.ZrO<SUB>2</SUB> composites compacts was investigated through a colloidal filtration route to consolidation. The green compacts consolidated from a powder suspension by a colloidal filtration method did exhibit uniformly-packed microstructure with a smaller particle size and a narrower particle-size distribution, compared with those of the compacts fabricated by a uniaxially pressing technique. The dispersion states of powder suspensions were controlled by adjusting pH and/or by adding a surfactant. The filtration rate and strength of the colloidal-filtered compacts were improved by the addition of an optimum amount of the surfactant, which was determined by a zeta-potential technique. A higher sinterability and superior mechanical property of mullite/4Y.Zr0<SUB>2</SUB> composites can be achieved by using the colloidal filtration method relative to the uniaxial pressing technique, reflecting the uniformity of the green compact microstructure.