DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Lee, June-Gunn | - |
dc.contributor.advisor | 이준근 | - |
dc.contributor.author | Kim, Young-Wook | - |
dc.contributor.author | 김영욱 | - |
dc.date.accessioned | 2011-12-15T01:00:41Z | - |
dc.date.available | 2011-12-15T01:00:41Z | - |
dc.date.issued | 1990 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=61571&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/50040 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 재료공학과, 1990.2, [ v, 146 p. ] | - |
dc.description.abstract | Pressureless sintering has been studied in $Al_2O_3$-TiC particulate and $Al_2O_3$-SiC whisker composites. The current widespread fabrication method for these composites is hot pressing. Sintering and SIN/HIP(sintering followed by hot isostatic pressing) are more desirable methods of fabrication, since complex shapes can be made economically and these processes lend themselves to mass production of near-net-shape material. The densification of $Al_2O_3$-TiC composites is detrimentally affected by chemical reactions between $Al_2O_3$ and TiC. These reactions must be suppressed in order to promote sintering. In this study, the specific reactions occurring in $Al_2O_3$-TiC composites were modeled, using thermodynamic calculations, and verified by experiments. The reaction between $Al_2O_3$ and TiC was suppressed by the use of specially prepared embedding powders allowing pressureless sintering to closed porosity. The $Al_2O_3$-TiC composites were subsequently hot isostatically pressed to $> 99\%$ of theoretical density without encapsulation. Typical flexural strength and fracture toughness of $Al_2O_3$-26 vol% TiC composites were 690 MPa and 4.3 MPa.$m^{1/2}$, respectively. High density compacts, up to 88% of theoretical density, of $Al_2O_3$-SiC whiskers were prepared by pressure casting and impregnation technique. Starting with these green bodies, composites of $Al_2O_3$-20 vol% SiC whiskers were pressureless-sintered to higher than 95% of theoretical density. They were further densified by hot isostatic pressing up to 99% of theoretical density, resulting rupture strength of 680 MPa and fracture toughness of 4. 70 MPa.$m^{1/2}$. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | 상압 소결 | - |
dc.subject | 알루미나이드 | - |
dc.title | Pressureless sintering of $Al_2O_3$-based composites | - |
dc.title.alternative | $Al_2O_3$ 기지 복합재료의 상압소결 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 61571/325007 | - |
dc.description.department | 한국과학기술원 : 재료공학과, | - |
dc.identifier.uid | 000815050 | - |
dc.contributor.localauthor | Kim, Young-Wook | - |
dc.contributor.localauthor | 김영욱 | - |
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