| 학회 | 한국재료학회 |
| 학술대회 | 2018년 가을 (11/07 ~ 11/09, 여수 디오션리조트) |
| 권호 | 24권 2호 |
| 발표분야 | D. 구조 재료 분과 |
| 제목 | Oxy-acetylene torch test and microstructure analyses of ceramics above 1500℃ |
| 초록 | When ceramic materials are applied for the aerospace vehicle in a high speed, the temperature increases drastically above 1500 ℃ due to air drag. To overcome external factors in harsh environment, materials should meet the outstanding thermal, mechanical properties and phase stability. The representative aerospace material is Si3N4, which has high strength and thermal stability. However, it is difficult to measure the dielectric and thermal properties of Si3N4 at the ultra -high temperature using the torch system since the Si3N4 material is easily broken owing to high thermal expansion coefficient. Another candidate is fused silica, which can tolerate above 1500 ℃ and has low dielectric constant. However, the surface of fused silica melts and changes sample thickness that they bring about increase in dielectric loss. Therefore, it is required to find adequate materials without significant deformation during applying the heat. In this work, a variety of candidate materials were tested by oxy-acetylene torch to evaluate the thermal and phase stability at the high temperature above 1500 ℃. |
| 저자 | Ho Jin Ma1, Jung Hoon Kong1, Eun Seok Heo1, Dong Gyu Kim1, Seung Yong Lee1, Jin Woo Park2, Do Kyung Kim1 |
| 소속 | 1KAIST, 2Agency of Defense Development |
| 키워드 | <P>High temperature ceramics; torch test; microstructure</P> |
