2004年1月
Differential sintering by improper selection of sintering parameters during pulse electric current sintering
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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- ,
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- 巻
- 87
- 号
- 1
- 開始ページ
- 159
- 終了ページ
- 161
- 記述言語
- 英語
- 掲載種別
- 出版者・発行元
- AMER CERAMIC SOC
Recently, we reported on the retention of fine-grained microstructure in Al2O3/3 vol% 3Y-ZrO2 composites using the pulse electric current sintering (PECS) technique. It was demonstrated that a high heating rate is beneficial for the retention of fine grains and homogeneous microstructure. As there are few reports on microstructural inhomogeneity and excessive grain growth in compacts densified by the PECS technique, we carried out a series of experiments on monolithic alumina by varying the sintering parameters and discussed the characteristic results. All specimens that were densified under selective sintering conditions attained high density (similar to99% of the theoretical density) at 1250degreesC in <5 min. The average fracture strength of monolithic alumina was observed to be 741 +/- 25 MPa and the fracture toughness was 2.2 MPa.m(1/2), and these were reasoned out to small grains. However, compacts sintered under very low compaction pressure attained similar to92%-93% of the theoretical density, and these specimens had undesirable microstructural inhomogeneity owing to differential sintering. Hence, in the present study, we address the problem of differential sintering.
- リンク情報
- ID情報
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- ISSN : 0002-7820
- identifiers.cinii_nr_id : 9000239248799
- Web of Science ID : WOS:000188429200027