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KMID : 1035320170440040387
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Korean Society for Dental Materials
2017 Volume.44 No. 4 p.387 ~ p.394
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Hardness and corrosion resistance of dental Ti-Zr alloy by changes of zirconium contents
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Kong Ji-Hyun
Kang Myong-Hun
Park Jung-Eun
Kim Tae-Hwan
Kim Kyung-Seon
Bae Tae-Sung
Lee Min-Ho
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Abstract
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Titanium alloy is actively investigated as an alternative material because the value of precious metals is soaring recently, and it is successfully used for implant prosthesis, partial frameworks, and metal-ceramic copings. In this study, Ti-Zr alloys were developed, and their physical characteristics were investigated with pure Ti for use as dental implant. A series of binary Ti-Zr alloys were fabricated with Zr contents of 2, 4, 6, 8, 10 and 12 wt%, and the corrosion resistance was measured by a potentiodynamic polarization test. Also, the micro-hardness of the Ti-xZr alloy was investigated using the micro-vickers test. The hardness and corrosion resistance of all the Ti-xZr alloys were found to be significantly higher than pure Ti (p<0.05), and in particular, the hardness increased as the content of Zr increased to 8 wt%, but decreased with the addition of more than 8 wt%Zr. As a result of the potentiodynamic polarization, the current density of all groups was lower than pure Ti due to the addition of Zr, it means that the addition of Zr less than 10 wt% increased the physical and electrochemical properties of Ti.
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KEYWORD
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Ti-Zr alloys, microhardness, corrosion resistance
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