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Cu-Mn-Al 합금에서 Al 이 Mn 원자의 확산에 미치는 영향
김동의 대한금속재료학회(대한금속학회) 1980 대한금속·재료학회지 Vol.18 No.6
Cu-Mn-Al 삼원계합금의 FCC-γ 상영역에서, 기체-고체접촉방법에 의하여 Mn의 상호확산계수 D~_(Mn)을 Mn과 Al의 함수로 구하였다. Mn의 확산 계수는 Mn 함량이 증가하면 증가하고, 불순물로서 Al이 증가하면 오히려 감소하는 경향을 보였다. 즉, Cu-Mn의 2원계 합금에서, 10a/o Mn일 경우 D~_(Mn)은 0.50×10^(-9) ㎠/sec, 20a/o Mn에서는 0.93×10^(-9) ㎠/sec 이였으나, 0.5a/o Al이 첨가되므로서, 10a/o Mn일 경우 D~_(Mn)은 0.43×10^(-9) ㎠/sec, 20a/o Mn에서는 0.82×10^(-9) ㎠/sec로 감소하였다. Interdiffusion coefficients of manganese D~_(Mn) were investigated as the functions of solute atoms of manganese and impurity atoms of aluminum in FCC-γ phase of Cu-Mn-Al ternary alloy at 800℃ by using the vapor-solid couple method. Diffusivity of manganese are gradually increased by the addition of manganese, but decreased by the addition of aluminum. D~_(Mn) in Cu-Mn binary alloy is 0.50×10^(-9) ㎠/sec at 10a/o Mn, 0.93×10 D~_(Mn) ㎠/sec at 20a/o Mn, but it is decreased by the addition of 0.5a/o Al to 0.43×10^(-9) ㎠/sec at 10a/o Mn, 0.82×10^(-9) ㎠/sec at 20a/o Mn.
김동의,정권표,조용환 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.1
Reduction of molten iron oxide with Ar-H₂ plasma was studied using a DC 15KW power sourse. 50g of sample was melted by Ar plasma and reduced in a stream of Ar-H₂ gas, the flow rate of which was 17ℓ/min. Degree of reduction (R) was reached as much as 95% within 12 min by Ar-H₂(14%) plasma, and it was linearly propotional to both the reduction time and the partial pressure of hydrogen. Additives such as CaO, MaO, SiO₂ and A1₂O₃charged in the range of 1-20% showed only trivial effects, however in case of charging serpentine which contained same ratio of acid and basic components, there was a tendence to increase in the reduction degree Kch. Reduction rate constant was calculated, as a function of hydrogen concentration in the Ar-H₂Plasma, the 0.512. Reduction rate and gas utilization % were increased with the increase in plasma temperature, dissociation of H₂and gas ionization such as H→H^+ + e.