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주형점결재에 (鑄型粘結材) 의한 Al-Cu 합금의 응고조직에 관한 연구
최창옥,이계완 ( Chang Ock Choi,Kye Wan Lee ) 한국주조공학회 1986 한국주조공학회지 Vol.6 No.1
The effects of various kind of molds on cast structures were studied. Al-4.5% C1i and Al-8% Cu alloys. Five kinds of sand molds which were mixed with different binders and a metal mold were used. Density, dendrite arm spacing and dendrite arm length of the cast alloys were greatly affected by quantities and materials of mold binders. The macrostructures examined were entirely equiaxed grains with little influences of types of molds. It is possibly due to the separation of growing crystals from the mold wall at the inital stage of solidification.
순 (純) Al 주괴의 (鑄塊) 응고조직에 미치는 주형 (鑄型) 점결재의 (粘結材) 영향에 관한 연구
최창옥,이계완 ( Chang Ock Choi,Kye Wan Lee ) 한국주조공학회 1985 한국주조공학회지 Vol.5 No.1
The effects of mold binders on the formation of equiaxed zone of 99.8% AL ingots were studied with various sand molds and metal mold. The formation of equiaxed crystals are increased by furan, cement, CO₂and metal mold, and decreased by greensand and shell mold. Pouring temperature moat be kept as low as possible to get a fine grain Structure and to increase of volume of equiaxed zone. The effect of surface roughness on volume of equiaxed zone were depend upon by the kind of mold binders. These are caused by separation of crystals from the mold wall in the initial stage of solidification before formation of the stable solid skin.
CO2 주형의 (鑄型) 붕괴성에 (崩壞性) 대한 잔류강도의 (殘留强度) 변화에 관한 연구
최창옥,성경훈 ( Chang Ock Choi,Kyong Hun Sung ) 한국주조공학회 1983 한국주조공학회지 Vol.3 No.3
Effects of retained compression strength on the collapsibility of CO₂mold sand using sodium silicate were studied. The results obtained from the experiment are summurized as follows; 1) The sand mixtures Increased their compression strength and retained compression strength when content of sodium silicate is high or mole ratio of sodium silicate is high. 2) Increase of retained strength has a maximum value at temperatures about 200℃. When the sample reached 800℃, the binder bridge are homogeneous The retained strength is increased 3) Decrease of retained strength at temperatures over 200℃ is caused by pore formation and additives of seacoal markedly accelerated pore formations.
후란자경성 (自硬性) 주형용 (鑄型用) 국산인조규사의 (國産人造硅砂) 활용에 관한 연구
최창옥,이상윤 ( Chang Ock Choi,Sang Yun Lee ) 한국주조공학회 1981 한국주조공학회지 Vol.1 No.3
N/A An emphasis has been placed on the importance of selecting a sand for furan sand process, which ie affected by the properties of sand. Investigations have been carried out to use the domestic artificial sands for the furan sand process. For laboratory investigations, the sands have been prepared and tested for chemical analysis, loss on ignition, sieve analysis, AFS grain fineness number, grain shape, PH value, acid demand, surface shape, theoretical surface area, moisture absorption, crushing durability and compressive strength and S. S. I. of molding sands. Most commercial sands have been found to be able to be used. The main requirement of the sands has been shown to be that 3 or 4 screen sands, AFS no.40-70 (or 100), of low acid demand, good surface area and good grain shape require less resin and catalyst to give an adequate strength.