분무건조법에 의한 용사용 원적외선 세라믹/AI 복합분말제조 및 용사층의 특성

홍성준; 김병희; 민재웅; 송병길; 노재승; 서동수; S.J. Hong; B.H. Kim; Jae-Woong Min; B.G. Song; J.S. Roh; D.S. Suhr

Korean Journal of Materials Research, Vol.9, No.12, 1205-1210, December, 1999

Fabrication of Far-Infrared Ceramic/AI Composite Powders by Spray Drying Method and Characteristics of the Plasma Sprayed Coating Layer

홍성준, 김병희, 민재웅, 송병길, 노재승, 서동수

충남대학교 공과대학 재료공학과

S.J. Hong, B.H. Kim, Jae-Woong Min, B.G. Song, J.S. Roh, and D.S. Suhr

Department of Materials Science and Engineering, Chungnam National University, Korea

초록

분무건조법으로 용사용 원적외선 세라믹/알루미늄 복합분말을 제조하여 플라즈마 용사법으로 알루미늄 모재에 용사한 후, 미세구조, 결정상, 열충격저항성 그리고 분광복사율을 조사하였다. 분무건조된 복합분말의 입형은 구형으로 34~105 μm . 영역에서 높은 복사율을 보였다. 그러나 알루미늄 첨가량이 증가할수록 원적외선 방사특성은 감소하였다. 결과적으로 용사법으로 원적외선 방사특성의 큰 손실 없이 방사체를 제조하기 위해서는 20~30%wt%Al를 첨가하여 복합분말을 제조하는 것이 가장 효율적이라고 판단된다.

Far infrared ceramic/aluminum composite powders for thermal spray were fabricated by spray drying method and investigated the characteristics of the plasma sprayed coating layers, I.e. microstructure, phases, thermal shock resistance and spectral emissivity. The shape of the spray dried composite powder was spherical and the particle size distribution was 34~105 μm . Aluminum was distributed homogeneously in the spray dried composite powder. Spectral emissivity of the plasma sprayed coating layer ranges from 3 to 14 μm whereas spectral emissivity of the raw ceramic powder ranges from 8 to 14 μm . And then spectral emissivity of the coatings was better than that of the raw powder but spectral emissivity was decreased with increasing aluminum content. It was found that aluminum content ranging from 20 to 30wt% was suitable for fabricating far-infrared radiator by plasma spraying method.

[References]

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Pawlowski L, The Science and Engineering of Teermal Spary Coatings, 158 (1995)
Lukasiewicz SJ, J. Am. Ceram. Soc., 72(4), 617 (1989)
Masters K, Spray Drying Handbook, 4th ed., George Godwin, London, 6, 1985. (1985)
Correa M, Transitional plasma jet processing, 6th International Symposium on Plasma Chemistry, Montreal, Canada, paper A-3-1, (1983), (1983)
Wagner JB, Bull. Am. Cer. Soc., 53, 224 (1974)

[1] 이준근, 월간 세라믹스, 1(6), 30 (1988)

[2] Pawlowski L, The Science and Engineering of Teermal Spary Coatings, 158 (1995)

[3] Lukasiewicz SJ, J. Am. Ceram. Soc., 72(4), 617 (1989)

[4] Masters K, Spray Drying Handbook, 4th ed., George Godwin, London, 6, 1985. (1985)

[5] Correa M, Transitional plasma jet processing, 6th International Symposium on Plasma Chemistry, Montreal, Canada, paper A-3-1, (1983), (1983)

[6] Wagner JB, Bull. Am. Cer. Soc., 53, 224 (1974)