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용침에 의해 제조한 TiC-Mo2C-Ni 합금의 기계적 성질
은광용,김도연,전동일 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.3
The TiC-Mo₂C-Ni hard metals were prepared by infiltrating Ni infiltrant into porous skeletons of carbides, and microstructures and mechanical properties of the specimens were compared to those of conventionally sintered specimens. The density of residual porosity was decreased and formation of large grains could be inhibited by utilizing the infiltration technique. The infiltrated specimens showed higher transverse rupture strength than conventionally sintered specimens. The maximum value of transverse rupture strength was obtained when mole fractions of Ni and Mo₂C were the same.
Cu-30% Sn 합금분말로부터 제조된 함유축수의 성질
은광용,윤덕용 대한금속재료학회(대한금속학회) 1977 대한금속·재료학회지 Vol.15 No.2
The possibility of producing bronze oilless bearings from prealloyed copper-30% tin powder was investigated. The possibility of studying the dimensional change and homogenization during the sintering of Cu-Sn alloys with this prealloyed powder was also explored. The copper-30% tin prealloyed powder was made by gas atomization. The specimens of bearing shape were prepared by usual powder metallurgy techniques from the mixture of copper powder and the prealloyed powder. The copper powder sizes were similar to the commercial grade powder and the prealloyed powders were -200∼+270 mesh and -400 mesh. The specimens were sintered in hydrogen nitrogen atmosphere at temperatures ranging from 740℃ to 820℃ for times up to 24 minutes. Specimens sintered for 12 minutes showed large dimensional growth between 780℃ and 870℃ and the growth was larger for the specimens made from larger prealloyed powder. During sintering at 820℃ large dimensional growth occurred between 6 and 12 minutes and small growth up to 24 minutes. The changes occurring during sintering could be easily observed from the shape changes in the spherical prealloyed powders showe in the microstructure . The composition homogenization was also revealed in X-ray diffraction measurement. The results crsuggest that the dimensional growth occurs when the tin rich melt flows to copper clusters froming homogeneous & bronze. Measurements of oil impregnation and radial ushing strength indicate that oilless bearings with satisfactory properties can he produced from the copper-30% tin prealloyed powder. The results also show that the Cu-30% Sn prealloyed powder may provide a useful tool for studying the dimensional growth and homogenization during sintering of Cu-Sn mixtures.
T-15 고속도강에서의 계면이동 현상에 대한 실험적 해석
은광용,박종구 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.6
Interface migration was observed during the CAP process of the T-15 high speed steel with addition of boron or boric acid. The reason of the interface migration was an alyzed by EDAX analysis and model experiments. The main cause of this phenomenon was attributed to the occurrence of coherence strain by the composition change of tungsten atoms during cooling.
은광용,박종구,윤덕용 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.10
The liquid phase sintering behaviors of WC-Co compacts with milled and unmilled WC powders and large Co powder had been observed and compared to those observed previously in W-Ni and Fe-Cu alloys which show spherical grains. The compacts with milled WC powder show steady densification even during heating to the liquid phase sintering temperature. The compacts with unmilled WC powders show pronounced local densification during the liquid phase sintering, producing large pores. This observation is attributed to the rearrangement of the polyhedral grains under asymmetric capillary forces. In the compacts with large Co powder, large pores are initially produced when the Co particles melt and flow into the surrounding fine capillaries, but during the subsequent sintering treatment, the pores are filled by the Co-rich liquid as has been observed in W-Ni and Fe-Cu powder compacts. The mechanism of the pore filling process in WC-Co is expected to be quite complex because of the polyhedral grain shape.