遷移アルミナ粉末から調製したアルミナセラミックスのパルス通電焼結と強度に及ぼす粉砕メデイアの純度の影響

概要

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Alumina ceramics were densified at sintering temperatures of 1250-1550℃ by pulse electric current sintering (PECS) using transition alumina powder of mixed phases of y- and /-alumina prepared from polyhydroxoaluminum (PHA) gel. The starting high-purity powder (HP) was obtained by grinding the alumina powder with a planetary ball mill using a high-purity alumina (purity: 99.9%) pot and balls to prevent contamination derived from the abrasion powder worn during the milling. The HP thus obtained realized full densification at sintering temperatures 50-100℃ lower than those of the corresponding lowerpurity powder (LP), which was obtained by grinding with a planetary ball mill using a 93%-pure alumina pot and 99.9%-pure alumina balls. The HP could also provide alumina ceramics with higher bending strengths (approximately 860 MPa) than those obtained using LP.
社団法人日本セラミックス協会の論文
2003-10-01