Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지

Wettability and Microstructures of Ag System Insert Metals Manufactured by Mechanical Alloying Method:

기계적 합금화방법으로 만들어진 Ag계 삽입금속의 젖음성과 미세조직

  • 김광수 (순천향대학교 신소재·화학공학부) ;
  • 노기식 (순천향대학교 신소재·화학공학부) ;
  • 황선효 (한밭대학교, 신소재공학부)
  • Published : 2001.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Powder type Ag system insert metals were manufactured by mechanical alloying method. Alloying method was the ball milling process using zirconia ball media, and all alloying variables were constant except the milling time. The milling times were selected 24, 48 and 72 hours. The insert metals made by milling method were observed using scanning electron microscope and x-ray analyses. And also, the evaluation of wettability and microstructures of the insert metals were conducted to investigate the characteristics of the brazed joint. The wettability of the insert metals made by milling of 48 hours, was the best condition. And the insert metals contained Cd shows good wettability, however, there was the oxides residue on the brazing test specimen. The microstructures of the manufactured and the commercial insert metals were almost same displaying the Cu- rich proeutectic and Ag-rich eutectic. Further, there were some porosities. The 48 hours alloyed insert metal was exhibited the most sound brazed joint without containing porosity due to the superior wettability and good alloying condition.

Keywords

References

  1. J.Y Kang et. al. : J. of KWE, 10(2), 11 (1992)
  2. K. Roya, Processes and Materials of Manufacture. 3rd edition, Lindberg., 496
  3. G.M Slaugther : Welding J., 58(10), 17 (1979)
  4. ASM : Welding, Brazing and Soldering., 6. page
  5. C.C. Koch, O.B. Cavin, C.G. Mckamey and J.D. Scabrough : Journal of Apply physics, Letter, 43, 88 (1983) https://doi.org/10.1063/1.94213
  6. H. Fleiter : Proceedings of the 2nd Riso Symposium, Denmark, 218, (1981)
  7. R.b. Schwartz, R.R. perrich and C.K. Saw : J. Non-Crst. Solids., 76, 281 (1985)
  8. J.S. Benjamin and J.E. Volin : Metall. Trans., 5, 1929 (1974) https://doi.org/10.1007/BF02644161
  9. J.S. Benjamin : Metal Powder Report., 45, 122 (1990)
  10. Feng Li, K.N. Ishihara, P.H. Shingu : Metall Trans., 22A, 2849 (1991) https://doi.org/10.1007/BF02650245
  11. H. Okumura, K.N. Ishihara, P.h. Shingu and S. Nasu: J. Mat. Sci., 27, 153 (1992) https://doi.org/10.1007/BF00553851
  12. AWS : Welding Handbook, 398, 8th Ed.
  13. M. Schwartz : Metal Joining Manual, McGraw-Hill, New York, N.Y., 565, (1979)
  14. C.R. Heiple, S.S. Christiansen, D.L., Keller and et al., : Welding J., 69(9), 41 (1990)
  15. Silver Brazing Alloys-Cadmium Containing, Health and Saefty : The Sheffield Smelting Co. Ltd., Dec (1980)
  16. M. Schwartz: Brazing, CHAPMAN&HALL, 87, (1995)
  17. V.R. Miller and A.E. Schwanke : Weding Research Supplement., 57, 303, (1978)