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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 강명창
- 발행연도
- 2015
- 저작권
- 부산대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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In the present study, Si3N4/hBN ceramic composites with different hBN
contents were fabricated by ball milling and spark plasma sintering
process. To confirm hBN orientation in Si3N4/hBN ceramic composites,
sintering temperature and holding time were fixed to 1500℃ and 10min
respectively and then sintering pressure was maintained at 23MPa and 50MPa. Relative density, hBN orientation, hardness, fracture toughness
and microstructure were investigated by X-ray diffraction, vickers
indentation and field emission scanning electron microscope. Moreover,
micro-drilling was performed in order to identify effect of sintering
pressing direction with acquisition of cutting force signal on hBN
contents in Si3N4/hBN ceramic composites. Relative density of Si3N4/hBN
ceramic composites was decreased with increasing hBN contents. The
results of X-ray diffraction analysis showed high intensity of hBN (002)
plane on vertical plane with respect to sintering pressing direction. While
low intensity of hBN (002) plane was confirmed at parallel plane with
respect to sintering pressing direction for Si3N4/hBN ceramic composites.
Vickers hardness and fracture toughness was associated with hBN
orientation. Delamination factor of hole shape machined by
micro-drilling was investigated at entrance and exit zone. Cutting force
was decreased with increasing hBN contents in micro-drilling of
Si3N4/hBN ceramic composites. Also, cutting force also was increased
with increasing feed speed. The Si3N4/30wt% hBN composite shows the
best machinability among the composites in the evaluation of machined
hole shape and cutting force.
contents were fabricated by ball milling and spark plasma sintering
process. To confirm hBN orientation in Si3N4/hBN ceramic composites,
sintering temperature and holding time were fixed to 1500℃ and 10min
respectively and then sintering pressure was maintained at 23MPa and 50MPa. Relative density, hBN orientation, hardness, fracture toughness
and microstructure were investigated by X-ray diffraction, vickers
indentation and field emission scanning electron microscope. Moreover,
micro-drilling was performed in order to identify effect of sintering
pressing direction with acquisition of cutting force signal on hBN
contents in Si3N4/hBN ceramic composites. Relative density of Si3N4/hBN
ceramic composites was decreased with increasing hBN contents. The
results of X-ray diffraction analysis showed high intensity of hBN (002)
plane on vertical plane with respect to sintering pressing direction. While
low intensity of hBN (002) plane was confirmed at parallel plane with
respect to sintering pressing direction for Si3N4/hBN ceramic composites.
Vickers hardness and fracture toughness was associated with hBN
orientation. Delamination factor of hole shape machined by
micro-drilling was investigated at entrance and exit zone. Cutting force
was decreased with increasing hBN contents in micro-drilling of
Si3N4/hBN ceramic composites. Also, cutting force also was increased
with increasing feed speed. The Si3N4/30wt% hBN composite shows the
best machinability among the composites in the evaluation of machined
hole shape and cutting force.
목차
1. 서 론 11.1. 연구배경 11.2. 연구목적 32. 이론적 배경 52.1. 쾌삭성 세라믹 개요 52.1.1 hBN계 쾌삭성 세라믹 52.1.2 운모계 쾌삭성 세라믹 82.2. 방전 플라즈마 소결법 개요 92.2.1 방전 플라즈마 소결법의 원리 92.2.2 방전 플라즈마 소결법의 적용분야 112.2.3 난소결성 재료의 소결법 122.3. 세라믹의 기계가공 메카니즘 132.4. 마이크로 드릴링의 특성 142.4.1 마이크로 드릴의 구조 142.4.2 마이크로 드릴의 종류 142.5. 스텝이송방식을 이용한 마이크로 드릴링 가공 162.5.1 스텝이송방식의 필요성 162.5.2 스텝이송방식의 종류 163. 실험장치 및 방법 183.1. Si3N4/hBN 복합소재 제조 및 전처리 183.1.1 Si3N4/hBN 복합분말 준비 183.1.2 방전 플라즈마에 의한 Si3N4/hBN 복합소재 소결 193.1.3 Si3N4/hBN 복합소재 전처리 과정 223.2. Si3N4/hBN 복합소재 재료특성 평가 233.2.1 Si3N4/hBN 복합소재의 재료물성 평가 233.2.2 Si3N4/hBN 복합소재의 결정상 분석 263.2.3 hBN 배향도에 따른 균열전파거동 관찰 283.2.4 Si3N4/hBN 복합소재의 미세구조 분석 283.3. Si3N4/hBN 복합소재의 마이크로 드릴링 가공 294. 실험결과 및 고찰 334.1. Si3N4/hBN 복합소재 특성 334.1.1 Si3N4/hBN 복합소재 소결거동에 따른 복합소재의 밀도분석 334.1.2 Si3N4/hBN 복합소재의 물성 및 미세구조 파악 464.2. Si3N4/hBN 복합소재의 드릴링 가공성 494.2.1 hBN 첨가량 및 이송속도에 따른 가공홀 입구와 출구 형상 494.2.2 hBN 첨가량 및 이송속도에 따른 박리영역 정량화 534.2.3 hBN 첨가량 및 이송속도에 따른 절삭력 변화 565. 결 론 58참고문헌 60Abstract 68
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