激光熔覆工艺参数对生物陶瓷涂层组织性能的影响

Influence of Technological Parameters on Microstructure and Properties of Bioceramic Coatings by Laser Cladding

采用激光熔覆技术,在Ti-6Al-4V合金表面制备了生物陶瓷复合涂层,并对激光熔覆工艺参数与涂层组织及性能的关系进行了对比分析。结果表明,激光熔覆生物陶瓷复合涂层的优化工艺参数为:输出功率2.5kW,扫描速度140mm/min,光斑尺寸15mm×1mm。在优化工艺参数下获得了表观质量完好且与基体形成冶金结合的生物陶瓷复合涂层,涂层中最高显微硬度值达到1474HV0.3,物相组成主要为CaTiO3、HA(Ca10(PO4)6(OH)2)、α-TCP(α-Ca3(PO4)2)、β-TCP(β-Ca3(PO4)2)等。

The bioceramic composite coatings were fabricated on the surface of Ti-6Al-4V alloy by laser cladding. The relationship between technological parameters and microstructure and properties was studied. The results show that the optimal technological parameters of laser cladding are as follows： laser output power 2.5 kW, scanning speed 140 mm/min, laser beam size 15 mm × 1 mm. Based on the optimal technological parameters, the surface of bioceramic coatings is excellent and the coatings are metallurgical bond to the substrate. The maximum microhardness of bioceramic coatings reaches 1 474 HV0.3. Furthermore, the phases of bioceramic coatings are mainly composed of CaTiO3, HA（Ca10（PO4）6（OH）2）, α-TCP（α-Ca3（PO4）2） and β-TCP（β-Ca3（PO4）2）.