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Vol.49, No.9, 692 ~ 699, 2011
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| Title |
| Improvement of Surface Properties of CP-Titanium by Thermo-Chemical Treatment (TCT) Process |
| 정현경 Hyeon Gyeong Jeong , 이동근 Dong Geun Lee , O. Yaskiv , 이용태 Yong Tai Lee , 허보영 Bo Young Hur |
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| Abstract |
| The thermo-chemical treatment (TCT) process was applied to achieve surface hardening of CP titanium. The following three different surface modification conditions were tested so that the best surface hardening process could be selected:(a) PVD, (b) TCT+PVD, and (c) TCT+Aging+PVD. These specimens were tested and analyzed in terms of surface roughness, wear, friction coefficient, and the gradient of hardening from the surface of the matrix. The three test conditions were all beneficial to improve the surface hardness of CP titanium. Moreover, the TCT treated specimens, that is, (b) and (c), showed significantly improved surface hardness and low friction coefficients through the thickness up to 100㎛. This is due to the functionally gradient hardened surface improvement by the diffused interstitial elements. The hardened surface also showed improvement in bonding between the PVD and TCT surface, and this leads to improvement in wear resistance. However, TCT after aging treatment did not show much improvement in surface properties compared to TCT only. For the best surface hardening on CP titanium, TCT+PVD has advantages in surface durability and economics. |
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| Key Words |
| titanium, thermo-chemical treatment, oxy-nitriding, surface hardening |
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