검색 상세

2차상 없는 질화규소 나노 소결체 제조

Fabrication of dense bulk nano-Si_(3)N_(4)ceramics without secondary crystalline phase,

박민후 (Park, Min-Hoo, 경상대학교 대학원 세라믹공학과)

원문보기

  • 주제(키워드) 2단계 소결법 , 2차상 , 상관계조절법
  • 주제(KDC) 2단계 소결법을 이용하여 질화규소 나노소결체 제조시 발생하는 2차상 제어
  • 발행기관 경상대학교 대학원 세라믹공학과
  • 지도교수 배원태
  • 발행년도 2006
  • 학위수여년월 2006. 2
  • 학위명 석사
  • 소속대학원 및 학과 대학원 세라믹공학과
  • 전공 세라믹공학전공
  • 원문페이지 49
  • 본문언어 한국어
초록/요약moremore
Since the properties of the bulk ceramics are closely related to the grain size, the ceramic materials with nanoscale grain size is of interest in the present study. Sintering of nanosized powder compacts to full densification with minimum grain growth is a challenging task to achieve due to its high surface energy. Two-step sintering approach was developed to enhance densification with minimum grain growth for silicon nitride ceramics with liquid phase. Two-step sintering process gives rise to a very fine-grained βSi_(3)N_(4)-matrix with large agglomerated Si_(2)N_(2)O grains due to its high surface oxygen content. Addition of Y_(2)O_(3) shifts the composition to a primary phase field with no Si_(2)N_(2)O, gives rise to β-Si_(3)N_(4) with nano scale grain size and near full density
Since the properties of the bulk ceramics are closely related to the grain size, the ceramic materials with nanoscale grain size is of interest in the present study. Sintering of nanosized powder compacts to full densification with minimum grain growth is a challenging task to achieve due to its high surface energy. Two-step sintering approach was developed to enhance densification with minimum grain growth for silicon nitride ceramics with liquid phase. Two-step sintering process gives rise to a very fine-grained βSi_(3)N_(4)-matrix with large agglomerated Si_(2)N_(2)O grains due to its high surface oxygen content. Addition of Y_(2)O_(3) shifts the composition to a primary phase field with no Si_(2)N_(2)O, gives rise to β-Si_(3)N_(4) with nano scale grain size and near full density
목차moremore
Ⅰ. 서론 = 1
Ⅱ. 이론적배경 = 3
2. 1 Si_(3)N_(4)의 미세구조 나노화 = 3
...
Ⅰ. 서론 = 1
Ⅱ. 이론적배경 = 3
2. 1 Si_(3)N_(4)의 미세구조 나노화 = 3
2. 2 Si_(3)N_(4)의 결정형 = 5
2. 3 Si_(3)N_(4)의 소결조제 = 11
2. 4 Si_(3)N_(4)의 상변태 = 12
2. 5 Si_(3)N_(4)의 고온 열분해 = 16
2. 6 Si-(3)N_(4)의 치밀화와 입성장 = 19
Ⅲ. 실험방법 = 20
3. 1 Two-step sintering process = 22
Ⅳ. 결과 및 고찰 = 26
4. 1 6Y3A분말 소결 = 26
4. 2 Y_(2)O(3) 첨가에 따른 상관계 조절 = 34
Ⅴ. 결론 = 46
Ⅶ. 참고문헌 = 47