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Journal of the Korean Ceramic Society 1994;31(7): 703. |
| $Ce-TZP/Al_2O_3$ 세라믹 복합재료의 소결과 미세구조 |
| 박홍채, 홍상희, 이윤복, 오기동 |
| 부산대학교 무기재료공학과 |
| Sintering and Microstructure of $Ce-TZP/Al_2O_3$ Ceramic Composite |
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| ABSTRACT |
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Sintering and microstructure of Ce-TZP/Al2O3 composite with $alpha$-Al2O3 matrix containing dispersed 5~50 vol% ZrO2 were discussed. Sintered density was increased with elevating forming pressure in range of 6~300 MPa and about >99.2% of theoretical density was obtained at 1$600^{circ}C$ for 2h in case of 300 MPa of 6~300 MPa uniaxially cold-pressed compacts containing 20 vol% ZrO2. All kinds of different batch composition exhibited nearly the same shrinkage behaviour with end-point shrinkage between 20 and 24%, and had the maximum shrinkage rate (0.41~0.54%/min) around 140$0^{circ}C$. Grain growth was occurred faster in $alpha$-Al2O3 than in {{{{ gamma }}-Al2O3 starting matrix during sintering at 1$600^{circ}C$. Bimodal pore size distribution of interaglomerate pores with size of 0.03~0.2 ${mu}{textrm}{m}$ and of interaglomerate pores with size of around 60 ${mu}{textrm}{m}$ was obtained in Ce-TZP/$alpha$-Al2O3 composite sintered at 130$0^{circ}C$. But unimodal pore size distribution with around 0.1 ${mu}{textrm}{m}$ was observed in Ce-TZP/{{{{ gamma }}-Al2O3 composite sintered at the same temperature. Microcracks were occurred due to the tlongrightarrowm transformation of ZrO2 on cooling process. |
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