Low Temperature Sintering of Bimodal Alumina Powder Mixtures with Nanocrystalline Component

Journal of Inorganic Materials

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Low Temperature Sintering of Bimodal Alumina Powder Mixtures with Nanocrystalline Component

LI Jiang; PAN Yu-Bai; NING Jin-Wei; HUANG Li-Ping; GUO Jing-Kun

State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China

Received:2002-09-04 Revised:2002-11-25 Published:2003-11-20 Online:2003-11-20

Abstract

Abstract: Nanocrystalline α-Al₂O₃ powder was prepared by a wet-chemical method calcining the dry NH₄Al(OH)₂CO₃ precursor synthesized from NH₄Al(SO₄)₂and NH₄HCO₃. Alumina ceramics were fabricated by pressureless sintering process at 1450℃ from bimodal alumina powder mixtures with the prepared nanocrystalline component using MgO and SiO₂ as additives. The effect of nanocrystalline α-Al₂O₃ component on alumina ceramics was also studied. The materials fabricated have better mechanical properties.

Key words: Al₂O₃ ceramics, low temperature sintering, wet-chemical method, nanocrystalline

CLC Number:

TQ174

LI Jiang,PAN Yu-Bai,NING Jin-Wei,HUANG Li-Ping,GUO Jing-Kun. Low Temperature Sintering of Bimodal Alumina Powder Mixtures with Nanocrystalline Component[J]. Journal of Inorganic Materials.

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Low Temperature Sintering of Bimodal Alumina Powder Mixtures with Nanocrystalline Component

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