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이계완,조정완,김길무 대한금속재료학회(대한금속학회) 1972 대한금속·재료학회지 Vol.10 No.1
CO·CO₂가스 분위기하에서의 Fe-W 용융체에 대한 슬래그-용강간의 반응을 1,650℃ 및 1,750℃에서 검토하였다. Pco/Pco₂=5.0 이상에서 텅스텐의 슬래그-용강간의 분포, [W]/(WO₃)는 다음 반응평형에 따라 결정된다. (WO₃)+3[Fe]=[W]+3(FeO) log K_f=-22,300/T+10.66 슬래그-용강간의 반응에 대한 평형항수, K_f는 1,650℃의 경우 Pco/Pco₂=3.3이하에서 점차로 감소하고, 1,750℃의 경우는 Pco/Pco₂=5.0 이하에서 급격히 감소한다. 슬래그상중의 (FeO)함량은 Pco/Pco₂가 감소함에 따라 다음 반응에 의하여 증가한다. [Fe]+CO₂=(FeO)+CO 공기중에서 용해할 때 슬래그-용강간의 반응을 다음과 같이 추정하였다. (WO₃)+2.5[Fe]=[W]+2.5(FeO_(1.2)) log K_i=-14,288/T+6.31 Slag-metal reactions for iron-tungsten melts under CO·CO₂ gas atmosphere are investigated at 1,650℃ and 1,750℃. When Pco/Pco₂ is more than 5.0, slag-metal distributions of tungsten, [W]/(WO₃), can be determined by the following reaction equilibriclm. (WO₃)+3[Fe]=[W]+3(FeO) log K_f=-22,300/T+10.66 The equilibrium constant, K_f, for the slag-metal reaction slightly decreases when Pco/Pco₂ is less than 3.3 at 1,650℃, and suddenly decreases below Pco/Pco₂=5.0 at 1,750℃. (FeO) contents of slag phase increase, as Pco/Pco₂ decrease according to the following reaction, [Fe]+CO₂=(FeO)+CO, An estimation for slag-metal reactions on open melting is as follows; (WO₃)+2.5[Fe]=[W]+2.5(FeO_(1.2)) log K_i=-14,288/T+6.31
수분 : 점토비에 (粘土比) 따른 주물사의 (鑄物砂) 기계적 성질에 관한 연구
이계완,이추림 ( Kye Wan Lee,Choo Lim Lee ) 한국주조공학회 1984 한국주조공학회지 Vol.4 No.2
A Study on the Mechanical Properties of Molding Sand with Various Water/Clay Ratio A standard sample of molding sand was prepared by adding a various amount of bentonite, which has water/clay ratio from 0.4 to 0.6, into artificial sand, Hanyoung #6. The results obtained by measuring the room temperature properties of green mold are as follows. 1. This compressive strength of green molds which have 4% and 10% of bentonite decreased with increasing water/clay ratio, but the maximum strengths of 4.3 (psi) and 7.2 (psi) were observed in the samples with 6%, 8% bentonite respectively when the water/clay is 0.45. 2. The optimum water/clay ratio for strength and permeability increased from 0.4 to 0.5 with increasing clay. 3. The green compressive strength was proportional to the hardness. 4. Deformation increased with increasing water/clay ratio. 5. Flowability decreased with increasing water/clay ratio and clay content in molding sand.