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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.
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김동의 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.2
The diffusion of silicon and carbon atoms was studied in γphase of Fe-Si-C ternary alloy at 1000℃ under the steady-state condition. Diffusion cell assembly, essentially, consisted of a thin sheet of pure iron and a silicon powder (60 mesh) which was packed on one side of the membrane, while the other side was packed with manganese powder. Both sides of the pure iron membrane, were packed with 0.7 mm φcarbon rods to maintain the equal carbon potentials. Atomic rnobilitics of silicon were measured along each of the steady-state diffusion concentration profiles. Diffusion coefficient of silicon D_(22) was found to be, 39∼5.79×10^(-11) ㎠/s in Fe-2.8∼1.5 at. pct Si-2.2∼1.5 at, pct C system, where the diffusivity of silicon was increased by the addition of silicon and carbon atoms. Interstitial carbon atoms diffuse more rapidly than the substitutional silicon atoms. The carbon atoms on the gradient of slow moving component, will easily become a state of a transient equilibrium. The ratios of diffusivity of carbon D_(11) and cross term D_(12) were calculated by D_(12)/D_(11) ∼ 0.1∼0.19 at Yc=0.019∼0.021 in a Fe-Si-C alloy.
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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.
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