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KMID : 0362120050270010073
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Journal of Technologic Dentistry
2005 Volume.27 No. 1 p.73 ~ p.78
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Surface Reaction between Phosphate bonded Investment and Ti-Zr-Cr based Alloy for Dental castings
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Jung Jong-Hyun
Joo Kyu-Ji
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Abstract
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The surface-reacted layer of titanium castings greatly affects their mechanical properties. This study analyzed the interfacial zone of Ti-20%Zr-5%Cr alloy castings obtained from phosphate bonded investment and examined the relationship between the surface-reacted layer and hardness. The Vickers hardness of cast disks were tested at 20 ㎛ intervals from the surface to 120 ㎛ in depth. The cross-section was observed metallurgically, and line profile of the reacted layer was conducted under the EDX. The surface-reacted layer of Ti-20%Zr-5%Cr alloy is showed a similar tendency to Ti-6%Al-4%V alloy in thickness, and also Si diffusion in multiple reacted layer of Ti-20%Zr-5%Cr alloy is less than cp Ti and similar to Ti-6%Al-4%V alloy. The Vickers hardness in the surface layer was greater than in the inner part, and the Vickers hardness of Ti-20%Zr-5%Cr alloy ranged 650 to 390 and cp Ti ranged 810 to 160, Ti-6%Al-4%V alloy ranged 710 to 530 respectively.
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KEYWORD
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Surface-reacted layer, phosphate bonded investment, Vickers hardness, EDX
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