치과주조용 Ti-Zr-(Cu)계 합금의 경도 및 미세조직
Hardness and Microstructures of Ti-Zr-(Cu) based Alloys for Dental Castings
주규지,
소속 상세정보
주규지 ( Joo Kyu-Ji ) - 비젼치과기공소
KMID : 0362120050270010065
Abstract
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. The alloys were cast into phosphate bonded SiO2 investment molds using an argon-arc casting machine, and The hardness and microstructures of the castings were investigated in order to reveal their possible use for new dental casting materials and to collect useful data for alloy design. The hardness of the Ti-13%Zr-5%Cu alloy(379Hv) became higher than that of Ti-13%Zr(317Hv) alloy, and the hardness of this alloys became higher than that of CP Ti(247Hv). Increasing in the hardness of the Ti-13%Zr-5%Cu alloy was considered to be solid solution hardening as the Ti-Zr system shows a completely solid solution for both high temperature phase and low temperature phase and also the inclusion of the eutectoid structure( Ti+Ti2Cu). No martensitic structures are observed in the specimen made of CP Ti, but Ti-13%Zr and Ti-13%Zr-5%Cu alloys show a kind of martensitic structure. Ti-13%Zr-5%Cu shows the finest microstructure.
From these results, it was concluded that new alloys for dental casting materials should be designed as Ti-Zr-Cu based alloys.
키워드
an argon-arc melting furnace;solid solution hardening;high temperature βphase;low temperature α phase; the eutectoid structure( αTi+Ti2Cu)
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