서지주요정보
W-Ni-Fe 중합금계 소결체내의 잔존기공에 대한 연구 = Formation of residual porosities in the W-Ni-Fe heavy alloy
서명 / 저자 W-Ni-Fe 중합금계 소결체내의 잔존기공에 대한 연구 = Formation of residual porosities in the W-Ni-Fe heavy alloy / 조융국.
저자명 조융국 ; Cho, Yoong-Goog
발행사항 [서울 : 한국과학기술원, 1985].
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소장정보

등록번호

4103302

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 8545

SMS전송

도서상태

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반납예정일

초록정보

The formation of residual pores in a W-Ni-Fe alloy have been investigated. In order to confirm that these were due to the solidification shrinkage of the liquid matrix, the bar specimen of 90.8W-6.45Ni-2.75Fe with length of 40 mm was slowly cooled by pulling it along the tube at 10℃/$\min$ after being sintered at 1460℃ for 8hr in $H_2$, so that the temperature gradient might be set up along the bar specimen. A number of shrinkage pores were observed in the rear parts of the bar specimen in which liquid matrix solidified later than front parts but the front parts solidified earlier were nearly fully densified. The gas-filled pores instead of shrinkage pores formed during initial stage of liquid phase sintering were observed in the specimen dipped into the liquid of the same composition with the matrix. The sintering of the powder mixture with artificially added oxides resulted in no difference in microstructure with the other specimen. Diffusing out hydrogen from the specimen by resintering the bar specimen for 20 min in Ar gave the same result with the bar specimen with no such treatment. These results excluded the possibility that the gas formation due to oxides or difference in hydrogen solubility between the liquid and the solid might be responsible for the formation of residual pores. It was concluded that the solidification shrinkage of the liquid matrix is the direct cause of the residual pores.

서지기타정보

서지기타정보
청구기호 {MMS 8545
형태사항 [iii], 37 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Yoong-Goog Cho
지도교수의 한글표기 : 윤덕용
공동교수의 한글표기 : 강석중
지도교수의 영문표기 : Duk-N. Yoon
공동교수의 영문표기 : S.J. L. Kang
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 수록
주제 Tungsten alloys.
Porosity.
Solidification.
텅스텐 합금. --과학기술용어시소러스
소결체. --과학기술용어시소러스
기공 (주조) --과학기술용어시소러스
수축. --과학기술용어시소러스
응고. --과학기술용어시소러스
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