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주동원(Dong Won Joo),구광덕(Kwang Duk Koo),성장현(Jang Hyun Sung) 대한금속재료학회(구 대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.12
To investigate the applicability of a coarse powder to the metal injection molding, coarse iron podwers were combined up to 60% in weight fraction with fine iron powders in the injection molding process. With increasing relative fraction of a coarse powder, the green density of the compacts increased slowly up to 97% at 60 wt. % addition of coarse powder and it became possible to remove a binder completely out of the compact through the broader channels of binder flow during the debinding stage. The increase in the porosity of the compact owing to the increasing portion of a coarse powder resulted in the decrease in the sintered density and volume shrinkage. And then it brought the tensile strength and elongation of the final product down. In this experiment the maximum amount of a coarse powder replacing a fine powder with the equivalence in densification behavior, microstructure and tensile property to injection molded-fine carbonyl iron powder was found to be 20% in weight fraction.
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카보닐 철분말의 사출성형시 결합제의 왁스 함량이 성형성에 미치는 영향
구광덕,성장현 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1
The effect of wax contents on the moldability in metal injection molding of the carbonyl iron powder was investigated. The binders were consisted with high molecular weight polymer of PMMA, PS and EVA, and with waxes of PW and CW. On increasing the relative weight fraction of wax contents up to 79wt.% in the polymer-wax binder mixture, the moldability and thermal properties of the binder was found to be improved. The moldability of the powder-binder mixture showed to be improved with increasing wax contents. But the agglomeration and separation of powder-binder mixture was shown at 56vol.% powder and 79wt.% wax. The experimental conditions for good molding into tensile mold appeared that the flow distance of spiral mold above 150㎜ and the mold temperature at 40℃. The amounts of binder removed and sintered densities were increased with increasing the wax contents.
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還元鐵 粉末을 混合한 카보닐鐵 粉末의 射出成形時 結合劑 選擇
具光德,李奭羲,成章鉉 東亞大學校 大學院 1993 大學院論文集 Vol.18 No.-
To select the optimum binder composition in the metal injection molding of the mixed powders of carbonyl and reduction powders, the PW, CW, SA and HDPE were selected as a multi-component binder and optimum applicable compostion of the multi-component binder was determined during the metal injection molding process. With increasing the HDPE content in the multi-component binders, the moldability(spiral length) decreased. The multi-component binder were condensed separated above 30wt.% of the HDPE. and the improvement of the moldability did not appear above 2wt.% addition of the Sa in the multicomponent binders. Considering the irregular particl size and proous holes at the surface of the reduction powder, it is possible to obtain a sound component for the composition of the binders of 82wt.%PW< 11wt.%CW, 5wT.%HDPE and 2wt.%SA in spited of the secrifice of the st4rength of the green part. The moldability and density decreased with increasing the weight fraction of the reduction powder. The minimum spiral length to obtain a sound green parts of the tensile testing specimen could be determined by using the moldability test. With increasing the weight fraction of the reduction ppoweder, the linear shrinkage decreased and also the sintered density incrased after decreasing at the 10wt.% addition of reduction powders.
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Fe-Ni계 혼합분말의 사출성형시 소결 분위기에 따른 탄소량과 기계적 성질
구광덕,성장현 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.1
After changing the Ni powder contents from 0 wt.% to 8 wt.%, the effect of H₂/N₂ sintering gas atmosphere on the carbon contents and mechanical properties during the metal injection molding process of carbonyl iron-nickel powders was carried out. The relative density of the most sintered specimen showed 94∼95%, except 96% density of 2 wt.% and 4 wt.% Ni specimen after sintering in the atmosphere of 60% H₂/N₂ gas mixture. The retained carbon content of the sintered specimen decreased with increasing the H₂ gas content. The carbon contents of the specimen were 0.46∼0.6 wt.% in the N₂ gas atmosphere, while they appeared extremely low above 40% H₂ gas. The microstrure became fine with increasing Ni content. With increasing the H₂ gas contents, tensile strength and hardness decreased gradually, hence elongation increased due to the reduction and decarbrization reaction with carbon and hydrogen.
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김영삼,정은,구광덕,이석의,김영주,성장현 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.8
The oxide reduced iron powders have been applied up to 60wt.% in the mix with the carbonyl iron powders to the injection molding process, and experimental measurements are presented to provide the basis for the practical usefulness of this novel approach. The hydrogen reduction of iron oxide powders is employed to produce fine, rounded powders of agglomerates with a great number of microscopic pores. The apparent and tap density of such an agglomerate as a reduced iron powder are determined to be 1.435g/㎤ and 2.573g/㎤, respectively. Both the spiral length (moldability) and the density of an injected green body decrease with increasing the relative fraction of oxide reduced iron powders in the mix, while the shrinkage ratio and sintered density increase. It is also found that tensile properties and hardness values reach the maximum with the 50wt.% addition of oxide reduced iron powders.
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