| 학회 |
한국재료학회 |
| 학술대회 |
2007년 가을 (11/02 ~ 11/02, 성균관대학교) |
| 권호 |
13권 2호 |
| 발표분야 |
구조재료 |
| 제목 |
폴리타이포이드 기능경사를 이용한 Si3N4-Al2O3 계 이종 세라믹 간 접합을 위한 기능경사재료(FGM) 적층의 저감 (Reduction of functionally graded material (FGM) layers for joining dissimilar ceramics in Si3N4-Al2O3 system using polytypoid functional gradients) |
| 초록 |
Reduction of functionally graded material (FGM) layers for joining dissimilar ceramics has been demonstrated in Si3N4-Al2O3 system using polytypoid functional gradients using three-dimensional analysis methods to check residual stress for FGM sample in this work. In the past, hot press sintering of multi-layered FGMs with 20 layers of thickness 500 um each has been fabricated successfully. The sample was hot pressed at 25 MPa, at 1700℃ and it was cooled at 2℃/min to minimize residual stress during processing. FEM(finite element method) program using Maximum principal stress theory was used to analyze the origin of the crack. As a result, we find that the experimental crack position matched the predicted crack position, obtained using simulation. Moreover, the fracture strength of each graded layer was calculated so that the position of low fracture strength across the graded layer was estimated to predict the position of the crack. Therefore, we were able to successfully estimate the crack position which matched the experimental results and calculate the fracture strength using FEM analysis. Such analyses are especially useful for graded FGM samples where the residual stresses are very difficult to measure experimentally. |
| 저자 |
류새희1, 박종하1, 이선영1, 이재철2, 안성훈2, 홍현정3, 류도형3
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| 소속 |
1한양대, 2서울대, 3요업기술원 세라믹 기술원 |
| 키워드 |
Si3N4-Al2O3 joining; FGM(functionally graded material); polytypoid; FEM(finite element method); hot press
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| E-Mail |
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