宽带激光熔覆工艺参数对梯度生物陶瓷复合涂层组织与烧结性的影响

The Effect of Technological Parameters of Wide-Band Laser Cladding on Microstructure and Sinterability of Gradient Bioceramics Composite Coating

采用宽带激光熔覆技术,在T i-6A l-4V合金上制备了梯度生物陶瓷复合涂层,并研究了宽带激光熔覆工艺参数对梯度生物陶瓷涂层显微组织与烧结性的影响。结果表明:当光斑尺寸D、扫描速度V不变时,随着输出功率P的增加,生物陶瓷涂层的致密度逐渐下降;随着输出功率P的增加,生物陶瓷层中的孔隙率逐渐增大。当P=2.3 KW时,生物陶瓷层中组织致密,孔隙率低(5.11%),当P=2.9 KW时,生物陶瓷涂层组织致密度差,孔隙率高达21.32%。生物陶瓷涂层显微硬度分析表明,P=2.3 KW时,显微硬度最高值约为1 100 HV。本实验条件下,宽带激光熔覆梯度生物陶瓷复合涂层的最佳工艺参数为P=2.3 KW,V=145 mm/m in,D=16mm×2mm。

The gradient bioceramics coating was prepared on the surface of Ti-6Al-4V alloy by using wideband laser cladding. And the effect of technological parameters of wide-band laser cladding on microstructure and sinterability of gradient bioceramics composite coating was studied. The experimental results indicated that in the circumstances of size of laser doze D and scanning velocity V being fixed, with the increasement of power P,the density of microstructure in bioceramics coating gradually degraded; with the increasement of power P, the pore rate of bioceramics gradually became high. While P= 2.3 KW,the bioceramics coating with dense structure and lower pore rate（5.11% ）was obtained; while P=2.9 KW,the bioceramics coating with disappointing density was formed and its pore rate was up to 21.32%. The microhardness of bioceramics coating demonstrated that while P = 2, 3 KW,the largest value of microhardness of bioceramics coating was 1100 HV. Under the condition of our research work,the optimum technological parameters for preparing gradient bioceramics coating by wide-band laser cladding are：P=2.3 KW, V=145 mm/min,D=16 mm×2 mm.