pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (28권6호 282-287)
A study on the Effect of Refractory Materials Composition and Slurry pH on the Reaction between Investment Casting Mold and Molten Ti
Ti 용탕과 정밀주조용 주형 간의 반응에 미치는 내화재료 조성 및 슬러리 pH의 영향에 관한 연구
Jae-Oh Shin, Won-yong Kim, Mok-Soon Kim*
Korea Institute of Industrial Technology, *Inha University,
The effect of CaO mold on the formation of reaction layer was investigated. CaO mold was prepared by mixing of Colloidal silica( NALCO® 1130) and an ZrO2, CaO at room temperature. The dried at 20 ± 3 °C, 75% humidity for 12hrs. Sample was prepared from the Cp-Ti(grade- 2) and melted by high frequence induction melting system in the vacuum condition. The react ion layer of Ti was confirmed by optical microscopy, microhardness(Hv) and X-ray diffraction. Thickness of reaction layer using the CaO stabilized ZrO2 was thinner than the CaO added ZrO2. And thickness of reaction layer were decreased with decreasing pH of slurry. CaO addition in the slurry could not controlled reaction between molten Ti and investment mold. On the other hand, the CaO chemical bonded ZrO2 by stabilization treatment could controlled reaction between molten Ti and investment mold.
CaO, Investment, Casting, Slurry pH.
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