Ti6A14V的激光涂层

 <正> 1.引言 钛和钛合金的抗磨性差且难于润滑,为改善其抗磨性,尝试过许多表面处理方法,如氮化,氰化、在碳酸钾中控制氧化、电镀和硼化等,但是共同缺点是所得涂层太薄及处理过程不同程度地损害基体。目前工程上需要同基体结合力强且无缺陷的厚涂层。激光涂层处理对基体影响小,涂层质量高且厚度易调整,能在很大程度上满足工程上要求,所以激光涂层很有发展前途。

LASER COATING OF TI6A14V

This paper deals with coatings on the surface of Ti6A14V with laser treatment for improving its poor resistance to wear and susceptibility to galling and seizing during contacts with most metals and alloys. A 1,5 kW continuous wave CO2 gas laser was utilized to melt powder of hexagonal BN with or without Ni-Cr-Cc-Al-Y powder on- the sur-face of Ti6A14V for obtaining coatings. X-ray diffractometer, optical metallograph and Vic-kers microhardness. tester were employed to characterize the coatings. Results show that hard compounds TiN and TiB2 were emerged in the coatings and the average thickness of high hardness area was 0.5mm. The coatings formed from 75 vol. % BN+25 vol. % (Ni-Cr-Co-Al) was of no cracks and had surface hardness of 1200HV. The wear behavour of such coatings was studied using a pin-to-bar wear tester.The laser coatings improved wear-resistant properties of Ti6A14V very significantly.