| WANG Pei,YE Yuan-sheng.Solid Self-lubricating Coatings on TC4 Titanium Alloy by Laser Cladding with h-BN[J],44(8):44-48,75 |
| Solid Self-lubricating Coatings on TC4 Titanium Alloy by Laser Cladding with h-BN |
| Received:April 20, 2015 Revised:August 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.08.008 |
| KeyWord:laser cladding TC4 titanium alloy h-BN self-lubricating coatings friction coefficient Wear resistance |
| Author | Institution |
| WANG Pei |
Northwest Institute for Nonferrous Metal Research, Xi'an , China |
| YE Yuan-sheng |
Northwest Institute for Nonferrous Metal Research, Xi'an , China |
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| Abstract: |
| Objective To optimize the process parameters for laser cladding of solid self-lubricating coatings on titanium alloy, and improve the surface wear resistance of titanium alloy. Methods Using the Nd: YAG laser, h-BN (hexagonal boron nitride) solid self-lubricating coatings were prepared on the surface of TC4 titanium alloy under conditions of high power and low power, respectively. The macro morphology, layer phase composition, microstructure, hardness and wear resistance of the ceramic layer were analyzed, and the tribological property of the ceramic layer was studied using a friction and wear tester. Results At low laser power, there was severe floating loss of cladding material, and the phase composition of the cladding layer was mainly composed of TiN, TiB, TiB2 and other hard phase components, the hardness was relatively high, with the presence of cracks. At high laser power, melting of the substrate inhibited the floating of the lubricating phase h-BN, reducing the sputtering loss, and peritectic reaction occurred, generating elemental metal Ti, the hardness value of the cladding layer was low, but the friction and wear tests showed increased h-BN content in the lubricating phase led to better formation of lubricating coating, further reducing the friction coefficient. Conclusion Under the condition of output current 400 A, pulse width 5 ms, 12 Hz frequency, scanning speed 120 mm / min, overlapping rate 50% ~ 60% , the surface state of the laser cladding coating obtained was smooth and flat, and the friction resistance was the best. |
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