Evaluation of Ti-Cr-Cu alloys for dental applications

被引:32
作者
Koike, M
Itoh, M
Okuno, O
Kimura, K
Takeda, O
Okabe, TH
Okabe, T
机构
[1] Texas A&M Univ Syst, Hlth Sci Ctr, Baylor Coll Dent, Dallas, TX 75246 USA
[2] Tohoku Univ, Grad Sch Dent, Aoba Ku, Sendai, Miyagi 9808575, Japan
[3] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan
关键词
D O I
10.1361/105994905X75600
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study examined the characteristics of as-east Ti-Cr(7-19%)-Cu(3-7%) (all percentages in this article are mass%) alloys to evaluate their suitability for dental applications; studies on the alloy structures and mechanical properties, grindability, and corrosion behavior were included in the investigation. The alloys were centrifugally cast and bench-cooled in investment molds. The x-ray diffractometry of the as-cast alloys bench-cooled in the molds indicated the following phases: alpha+beta+omega in the 7% Cr and 7%Cr+3%Cu; beta+omega in the 13%Cr; and beta in the 13%Cr+3%Cu through the 19%Cr+3%Cu alloys. The strengths of the binary beta Ti-Cr and ternary beta Ti-Cr-Cu alloys with 13 and 19% Cr were approximately two times higher than those of CP Ti. The alloy ductility was dependent on the chemical composition and thus, the microstructure. The 7% Cr alloys were extremely brittle and hard due to the omega phase, but the ductility was restored in the 13 and 19% Cr alloys. The hardness (HV) of the cast 13 and 19% Cr alloys was approximately 300-350 compared with a value of 200 for CP Ti. The grindability of the cast alloys was examined using a rotating SiC wheel at speeds (circumferential) of 500 and 1250 m/min. At the higher speed, the grindability of the 13 and 19% Cr alloys increased with the Cu content. The grindability of the 13% Cr alloy with 7% Cu was similar to that of CP Ti. Evaluation of the corrosion behavior in an artificial saliva revealed that the alloys are like many other titanium alloys within the normal intraoral oxidation potential. The wear resistance testing of these alloys also showed favorable results.
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页码:778 / 783
页数:6
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