| 학회 | 한국재료학회 |
| 학술대회 | 2011년 봄 (05/26 ~ 05/27, 제주 휘닉스 아일랜드) |
| 권호 | 17권 1호 |
| 발표분야 | E. Structural Materials and processing Technology(구조재료 및 공정기술) |
| 제목 | Curing behavior of phenolic resin with humid atmosphere on the porous ZrO2 ceramics |
| 초록 | The effects of relative humidity on the properties of the porous ZrO2 ceramics were investigated in terms of the curing behavior of phenolic resin as a binder. The ZrO2 powders containing 5wt% of phenolic resin were conditioned in a consistent chamber condition at a temperature of 50°C and different humidity levels (25, 50, 75, and 95%) for 1h. The exposure of humid atmosphere caused changes of density and microstructure in the green bodies. The higher level the powders were exposed to the humid atmosphere, the lower green density was obtained and the more irregular microstructure was observed due to aggregation by the curing of phenolic resin. After firing, the porosity of specimens has risen from 35.7% to 38.1% and Young’s modulus has declined in response to the variation of green density. These results could be explained by the degree of resin cure which was associated with the area under the exothermic peak enclosed by a baseline of DSC thermogram curve. Also, the curing behavior of phenolic resin according to relative humidity has been confirmed by decrease of ether groups which have interacted with the phenolic-OH group and the hexamine as a curing agent. Consequently, it could be demonstrated that increase the relative humidity during fabrication of porous ZrO2 diminished the compaction and properties of specimens after firing owing to curing of phenolic resin. |
| 저자 | 윤상현1, 김장훈1, 김주영1, 이준태2, 이희수1 |
| 소속 | 1부산대, 2한국산업기술시험원 재료평가센터 |
| 키워드 | porous ZrO2 ceramics; relative humidity; green density; phenolic resin; curing behavior |
