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KMID : 0362120050270010057
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Journal of Technologic Dentistry
2005 Volume.27 No. 1 p.57 ~ p.63
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Surface Reaction between Phosphate bonded SiO2 Investment and Ti-Zr-(Cu) based Alloys for Dental castings
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Joo Kyu-Ji
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Abstract
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Experimental Ti-13%Zr and Ti-13%Zr-5%Cu alloys were made in an argon-arc melting furnace. The grade 2 CP Ti was used to control. To investigate the surface reaction layers produced by the reaction with mold materials and the influence of the reaction layers on the hardness of castings, A phosphate bonded SiO2 base investment was used as mold material, and microstructure observation and hardness test were performed. The surface reaction layers of Ti-13%Zr and Ti-13%Zr-5%Cu alloys were thinner than that of CP Ti had a clearly multiple structure. A difference of the hardness between surface and inner of the Ti-13%Zr and Ti-13%Zr-5%Cu alloys became less than that of CP Ti. From the results, it was found that the Ti-Zr-(Cu) based alloys were possible to cast with SiO2 base investment without the great changes of mechanical properties of the castings.
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KEYWORD
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argon-arc melting furnace, the surface reaction layers, phosphate bonded SiO2 base investment, microstructure observation
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