生物活性玻璃陶瓷钛合金复合材料制备

采用搪瓷工艺,利用含有磷灰石和硅灰石的生物活性玻璃陶瓷(A W)对钛合金(TC4)进行两次涂层,制成了具有生物活性的复合材料·研究了第一涂层中A W粉的质量分数和气泡对烧结后涂层结合强度的影响,当A W粉的质量分数为50%时,一方面涂层中有足够的中性玻璃熔融后润湿基体,达到A W粉与基体的牢固结合;另一方面涂层中的气泡均匀细小,可缓冲烧结应力·基体与涂层的结合强度大于10MPa·第二涂层全部采用A W粉,保证了复合材料的生物活性·

Preparation of Ti-Alloy Matrix Composite with Bioactive Glass-Ceramic Coating

The bioactive glass-ceramic powder A-W in which the phosphorite and wollastonite are contained is used to coat twice the Ti-alloy TC4 by way of enamaling process so as to prepare the Ti-alloy matrix composite with bioactive glass-ceramic coating. The effects of mass fraction of the powder A-W and entrapped bubbles in primary coating on the bonding strength between matrix and coating after sintering were investigated. The results show that when the A-W mass fraction in primary coating is 50%, the amount of fused neutral glass in the coating is enough to wet down the matrix so as to bond firmly the powder A-W to the matrix, and the entrapped bubbles in the coating are so small and even as to buffer the sintering stress. It was found that the bonding strength between matrix and coating is higher than 10 MPa. The secondary coating is all of pure powder A-W to ensure the bioactivity of the composite.