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냉간 가공한 팔라디움의 비정상적인 수소 고용도에 대한 분석
박충년,Flanagan,Ted B.,이호종 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.1
The anomalous hydrogen solubilities in the deformed palladiums were analyzed by employing modified Kirchheim's model with considering the partially coherent strain energy which would induced during hydride precipitation around edge dislocations. The dislocation densities, obtained by this model, of the various cold worked and/or α↔β transformed palladium samples were the order of 10^(11)㎝^(-2) The partially coherent strain energies were about 3 kJ/㏖H and nearly same in the various samples. This value could be compared with the incoherent strain energy, 0.4kJ/㏖H, which was obtained from the hysteresis on, P-C isotherm, and the coherent strain energy calculated, 9.6kJ/㏖H.
박충년 한국수소및신에너지학회 2017 한국수소 및 신에너지학회논문집 Vol.28 No.5
The volume expansions of Ti0.95Zr0.05V0.4Mn1.45Fe0.1Cr0.05 alloy during hydrogenation with various conditions have been investigated. The theoretical volume expansion measured with XRD for this alloy with hydrogenation was 21%. The apparent volume expansion of this alloy ingot with hydrogenation was composed of two effects. One is a hydrogenation and the other is a pulverization. The apparent volume of free alloy powder was 1.8 times greater than that of an ingot, implying the pulverization effect on the apparent volume expansion is 80%. The apparent volume expansion of the alloy ingot with hydrogenation under a unconstrained condition was about 80 (±15)%, much smaller than that of free alloy powder which expected as 118%. In addition, The apparent volume expansion of the alloy ingot with hydrogenation under a constrained condition(Al container) was about 50%, much smaller than that of the unconsrained. This reduced apparent volume expansion of the alloy ingot could be attributed to an arrangement of alloy powder keeping its original shape of the ingot even after hydrogenation.
박충년,정우양 한국가구학회 2019 한국가구학회지 Vol.30 No.3
In this study it was suggested a heat treatment of a cylindrical bamboo to prevent from cracking accompanied drying. Theoretical evaluation for the changes of the strain and the residual stress arisen from drying showed that cracking could be produced due to the difference of strains between the inner and outer surfaces and would be harder at a high temperature than at a low temperature because a plastic accommodation would be significant at a high temperature whereas it would be negligible at a low temperature. In addition, it was known that if crack was not found during cooling and very early time after heat treatment (high temperature drying) crack would not be produced thereafter. In order to conform these theoretical predictions the heat treatments of cylindrical bamboos were carried out at 200°C for 0.5~3 hours and the heat treated and the untreated were kept at 60°C to see crack formation. As the result, the heat treated bamboos were not cracked whereas all of the untreated were cracked. The changes of the artificial cracks formed after heat treatment showed that the compressive residual stress was produced by absorption of moisture from air on the outer surface of bamboo 5 days after the heat treatment.
금속 수소화물 전극제조에 있어서 산성 무전해 구리 도금법의 응용
박충년,최전 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.1
Electroless copper plating method was employed in copper coating of the (LM)Ni_(4.5)Co_(0.1)Mn_(0.2)Al_(0.2) hydrogen storage alloy powders for the preparation of a hydride electrode by using an acidic bath containing only CuSO₄ and H₂SO₄. The coating characteristics and the electrode properties were examined by SEM, X-ray photoelectron spectroscopy and electrochemical measurements in a half cell. The coating was being performed very fast within 5 min. without any pretreatment at room temperature. It was shown that the maximum discharge capacity was 250mAh/g in all electrodes and was degraded with increasing number of cycles. As the alloy powder used was finer, the electrode reaction was faster. However the degradation of electrode was larger. It can be suggested that this electroless copper plating method could be applied to the preparation of the rare earth-nickel based alloy electrode.