α, β-SiAlON의 微細構造 形成과 特性에 關한 硏究 = (A) study on the microstructure formation and mechanical properties of α, β-SiAlON

다국어 초록 (Multilingual Abstract)

The specimens which were prepared from α-Si_(3)N_(4) with additions of YAG(3Y_(2)O_(3)· 5Al_(2)O_(3))-10wt% and various A1N content were sintered in N_(2) atmosphere at 1700℃. The effects of α, β-solid solution contents and sintering time on mechanical properties were investigated. As the content of β-solid solution and sintering time increased, the hardness is reduced, but the hardness of specimen sintered over 10 hours is constant irrespective of sintering time. While the fracture toughness increased with increasing of β -solid solution and sintering time. The fracture toughness of specimen with 80% β-solid solution content increased from 3.89 to 6.66 MPam^(1/2) with sintering time, up to 20 hours. But, the amount of increased fracture toughness of specimen with below 20% β -solid solution content is not significant.

목차 (Table of Contents)

• 목차
• 1. 서론 = 1
• 2. 문헌조사 = 3
• 2.1 Si_(3)N_(4)의 결정구조와 상관계도 = 3
• 2.2 Si_(3)N_(4) 제조 = 9
• 2.3 Si_(3)N_(4) 소결 = 11
• 2.4 Si_(3)N_(4) 물성 = 14
• 3. 실험방법 = 16
• 3.1 성형 및 소결 = 16
• 3.1.1 실험조성의 결정 = 17
• 3.1.2 분말제조 = 20
• 3.1.3 성형 및 소결 = 21
• 3.1.4 중량손실, 수축율 및 밀도 측정 = 21
• 3.2 상분석, 경도, 파괴인성 측정 및 미세조직 분석 = 22
• 3.2.1 XRD분석 = 22
• 3.2.2 경도 및 파괴인성 측정 = 23
• 3.2.3 미세조직 분석 = 24
• 4. 실험결과 및 토의 = 25
• 4.1 α-Si_(3)N_(4) 소결 = 25
• 4.1.1 상분석 및 고용화 = 29
• 4.2 β-Si_(3)N_(4) 소결 = 35
• 4.3 미세조직 = 38
• 4.4 기계적 물성 = 45
• 4.4.1 경도 = 45
• 4.4.2 파괴인성 = 48
• 5. 결론 = 53
• 6. 참고문헌 = 54
• Abstract = 62