チタン鋳造用埋没材開発のための基礎的研究

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As a basic study for development of investment for casting titanium, two commercial investments for high-fusing alloy were tested. The phosphate bonded investment (SS) and the alumina-magnesia investment (MT) were used. The relationship between the stability of the investments or each components of the investments and the reactive layer formed on the casting surface were examined at a high-temperatures under a reducing atmosphere. The following results were obtained : 1. SS was consisted of α-quartz (SiO_2), α-cristobalite (SinO_2) , MgO, Mg_3 (PO_4)_2 and Mg_2P_2O_7,on the other hand, MT was consisted of Al_2O_3,MaO, ZrO_2 and MgAl_2O_4 after firing. 2. On the activation energy (kJ/mol) of two investments, SS was 12. 3 and MT was 194. 1. And also the activation energy (kJ/mol) of each components of both investments, was 66. 2 on SiO_2,69.9 on Mg_3 (PO_4)_2,88.9 on MgAl_2O_4,103.3 on Al_2O_3 and 211.4 on ZrO_2. 3. Observation and element analysis by EPMA on the surface layers of the cast revealed that the reactivity of the components of two investments for the cast titanium was high in the order of Si>P>Al>Zr>Mg. 4. It was clearly that there should be strong relationship between the investments which had low activation energy and the thickness of reactive layer on the surface of cast titanium. At a high-temperatures, activation energy of the investment was lower, the reactive layer was thicker. 5. It was clearly that there should be strong relationship between the components of investments which had low activation energy and the products of reactive layer. At a high-temperatures, the reactive layer was produced from the components which had low activation energy in investment. 6. Compounds such as zirconium oxide or magnesium oxide were found as excellent components for titanium investment. From the describe above, it is conclude that the excellent investments for casting titanium could be obtained, if compounds having a high activation energy at a high-temperature were selected as refractory, inflating and binding components.
福岡歯科大学学会の論文
1994-06-30

著者

大坪裕一
福岡歯科大学大学院歯学研究科歯科補綴学ii専攻

チタン鋳造用埋没材開発のための基礎的研究

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