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Journal of the Korean Ceramic Society 1989;26(4): 453. |
| Al-isopropoxide로부터 합성한 AlN 세라믹스의 기계적 성질 |
| 박세민, 이홍림, 조덕호1 |
연세대학교 요업공학과
1국립 공업 시험원 |
| Mechanical Properties of AlN Ceramics Prepaerd from Al-isopropoxide |
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| ABSTRACT |
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Aluminum nitride powder prepared from the hydroxides, AlOOH and Al(OH)3 which were obtained by hydrolysis of Al-isopropoxide, was densified at 1750 and 180$0^{circ}C$ for 60 min by hot-pressing under the pressure of 25kg/$textrm{cm}^2$. Theoretical density could be obtained at 175$0^{circ}C$. Their flexural strengths were 450MPa and 395MPa for the specimens obtained from Al(OH)3 and AlOOH, respectively. There was no remarkable change in flexural strength up to 100$0^{circ}C$. Fracture toughness values were 3.50MN/m3/2 for Al(OH)3 and 3.11MN/m3/2 for AlOOH. It is assumed that these differences in mechanical properties are due to the abnormal grain growth for the AlN ceramics obtained from AlOOH. |
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