Fabrication and Mechanical Properties of Si3N4/SiC Nanocompoisites under Pressureless Sintering.

• Yang Jian-Feng

  Institute of Scientific and Industrial Research, Osaka University

• Choa Yong-Ho

  Institute of Scientific and Industrial Research, Osaka University

• Sekino Tohru

  Institute of Scientific and Industrial Research, Osaka University

• Niihara Koichi

  Institute of Scientific and Industrial Research, Osaka University

書誌事項

タイトル別名

• Fabrication and Mechanical Properties o

抄録

To meet the practical application, a kind of commercially available Si₃N₄ powder by direct Si nitridation was used to fabricate dense Si₃N₄/SiC nanocomposite by pressureless sintering method. The price of this kind of powder is much lower than that of powder by imide decomposition. 5-30 vol% of SiC powder (average particle size: 80 nm) were added in the composite to investigate the effect of SiC particle. Totally 15 wt% of MgAl₂O₄ and ZrO₂ (50 wt% each) were used as sihtering additives. With increasing SiC content, the densities of the composites decreased. α-β Si₃N₄ phase transformation was enhanced at low temperatures, but prohibited at high temperatures for large SiC content. The sample with larger SiC content gave a relatively smaller Si₃N₄ grain size because SiC particles limit the Si₃N₄ grain growth by pinning and prohibiting the grain boundary movement. An improvement of Young's modulus, flexural strength and hardness by the SiC addition was found. Further increase in SiC content resulted in a decrease of these properties because of the decreasing density for the samples sintered at low temperatures. With an intermediate sintering temperature, the samples with 20 vol% SiC reached to high flexural strength as 1050 MPa as a result of good density and relatively fine grain size structure. The decreased fracture toughness with increasing the SiC content was observed by the refinement of Si₃N₄ grain. However, it was improved with the increasing sintering temperature. The result of this study provided an economic way to fabricate the Si₃N₄/SiC nanocomposite with a strength higher than 1 GPa and appropriate fracture toughness.

収録刊行物

• 粉体および粉末冶金

  粉体および粉末冶金 45 (12), 1172-1177, 1998

  一般社団法人 粉体粉末冶金協会

キーワード

• silicon nitride
• silicon carbide
• nanocomposite
• silicon nitrided
• densification
• mechanical properties

詳細情報

• CRID: 1390282681284930432
• NII論文ID: 10002053436
• NII書誌ID: AN00222724
• DOI: 10.2497/jjspm.45.1172
• ISSN: 18809014
• ISSN: 05328799
• NDL書誌ID: 4629455
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4629455
• 本文言語コード: en
• データソース種別:
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