Abstract
Laser cladding coating has many advantages in surface modification, such as a small heat-affected zone, and good metallurgical bonding. However, some serious problems such as pores, and poor forming quality still exist in the coating. To suppress these problems, a novel process of ultrasonic vibration-assisted laser cladding process was adopted to in-situ synthesize TiC/TiB composite ceramic coating on the surface of titanium alloy. Results showed that the introduction of ultrasonic vibration effectively improved the surface topography of the coating, reduced the number of pores in the coating, refined the crystal grains of the coating, decreased the residual tensile stress in the coating, and increased the micro-hardness of the coating. The tribological properties of the coating were significantly improved by the ultrasonic vibration, the wear resistance of the coating fabricated with ultrasonic vibration at power of 400 W increased about 1.2 times compared with the coating fabricated without ultrasonic vibration, and the friction coefficient decreased by 50%.
Highlights
Titanium alloy has excellent biomechanical properties, outstanding formability and machinability, good corrosion resistance and favourable biocompatibility, which has been widely used in the field of artificial joint replacement [1]
[15] TiC/TiB bioinert composite ceramic coating was in-situ synthesized on the surface of Ti6Al4V titanium alloy by the laser cladding process, which significantly improved wear resistance of the titanium alloy surface, and the residual stress and crack sensitivity of the coating were reduced via post-heat treatment
In order to solve the above problems and further improve the tribological properties of the coating, we introduced ultrasonic vibration into the laser cladding process based on the original experiments, and used ultrasonic vibration-assisted laser cladding process to prepare ceramic coatings
Summary
Titanium alloy has excellent biomechanical properties, outstanding formability and machinability, good corrosion resistance and favourable biocompatibility, which has been widely used in the field of artificial joint replacement [1]. Ultrasonic vibration technology has been applied in laser engineering net shaping of ceramic and metal parts [17,18,19] and preparation of metal-based coatings by laser cladding [20,21,22] due to its characteristics such as refining crystal grains, reducing macro/micro defects, and improving mechanical properties. Ultrasonic vibration with a frequency of 20 kHz was introduced into the molten pool through an amplitude transformer by using the ultrasonic vibrationassisted laser cladding process, and a TiC/TiB composite bioinert wear-resistant ceramic coating was prepared on the Ti6Al4V alloy surface by in-situ synthesis with mixed B4C powder and Ti powder as cladding raw material. The substrates with the mixed powder layer were pre-dried at a constant temperature heating platform (Dongguan Shenwu Electronic Technology Co., Ltd., Dongguan, China) at 70 °C for 30 min, and put into a vacuum drying oven (Shenzhen Aiske Instrument Equipment Co., Ltd., Shenzhen, China) for continuous drying at 50 °C for 12 h
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