| Title |
Sliding Wear Behavior of Chromium Nitride Coated Free Machining Ti - 3Al - 2V Alloy |
| Authors |
김용석(Yong Suk Kim); 송진화(Jin Hwa Song); 정재인(Jae In Jeong); 이영백(Young Pak Lee); 이용태(Yong Tai Lee) |
| Abstract |
The sliding wear behavior of the chromium nitride (CrN and a composite CrN+Cr₂N) coated Ti-3Al-2V free machining titanium alloy against heat-treated tool steel was investigated. The wear test was carried out using a ring--on-disc type tester under dry and lubricated conditions. Under the applied stress of 6.5 MPa and dry wear condition the chromium nitride coatings started to be peeled off from the substrate through pitting and micro fragmentation processes. The hard debris of the detached and crushed coatings worked as abrasives, which accelerated the wear even though the coefficient of friction was lowered by them. The effect of precleaning, such as sputtering, on the wear resistance was more significant under the dry wear condition than under the lubricated condition. Under the lubricated condition the wear resistance of the coated specimen increased a lot compared with the dry condition and the variation of the friction load decreased. Good correlation between the wear rates and low coefficient of friction was also observed under the lubricated condition. |