电参数对钛合金微弧氧化生物活性陶瓷层钙磷成分的影响

采用自行研制的微弧氧化设备于(CH3COO)2Ca-CaC3H5(OH)2PO4溶液中制备了富含Ca、P成分的钛合金微弧氧化陶瓷层,研究了电压、电流密度、占空比等电参数对陶瓷层中Ca、P成分的影响及Ca、P在膜层中的分布.结果表明:随着电压或电流密度的升高,膜层中Ca、P相对含量增大,但Ca的增长速度远快于P,使得Ca、P的摩尔比随电压或电流密度的升高而增大;而占空比对膜层中Ca、P成分影响略有不同,随着占空比的增大,P相对含量先减少,而后很快趋于平缓,Ca相对含量和Ca、P摩尔比则呈上升趋势;沿膜层由表及里,Ca元素在膜层的含量分布呈现类似二次曲线递减趋势,P膜层中含量则大体均匀,但在膜基交界面迅速降为零.

Effect of electric parameter on calcium and phosphorus component of bioactivity micro-arc oxidation coatings on titanium alloy

Ceramic oxide coatings containing calcium and phosphorous were formed on titanium alloy in (CH_3COO)_2 Ca-CaC_3H_5(OH)_2PO_4 solution by micro-arc oxidation. The effects of electric parameters including voltage, current density and duty cycle on calcium, phosphorous component and distribution of the coatings were studied. The results show that calcium and phosphorous comparative contents increase with voltage or current density increasing, but calcium increases more quickly than phosphorous, and the mole ratio of Ca and P increases with the voltage or current density increasing. The effects of duty cycle on the calcium and phosphorous component are slightly different. With duty cycle increasing, the phosphorous comparative contents decrease firstly, then tend to stable, while calcium comparative content and mole ratio of Ca and P increase. From the surface to inner, calcium content decreases gradually in a similar trend of conic and the phosphorous content remains generally uniform in the coating, but decreases quickly to zero in the coating-substrate interface.