ZrO_2与HA复合粉体的烧结行为

Sintering Behavior of Zirconia-hydroxyapatite Composite Powder

将Ca3（PO3）2和Ca（OH）2粉以不同的比例混合后，加入不同量的ZrO2粉，制成料浆后球磨，然后压制，经预烧结合成HA，再在不同温度烧结来合成ZrO2／HA复合材料；用X射线衍射仪进行了物相分析。结果表明：原料粉在1000℃预烧结10h后，ZrO2／HA复合粉体中出现了β-Ca3（PO4）2和t-ZrO2相；复合粉体在1050-1350℃烧结4h后，当ZrO2加入量低（〈10％）时，在相对高的温度下（〉1200℃），复合材料中只有CaZrO3相存在；当ZrO2加入量高（30％）时，在各个温度段t-ZrO2相随着CaZrO3相的减少而增加；在1050-1200℃范围内，HA的分解加快，t-ZrO2的稳定性增强，但在1200-1300℃，HA的分解停滞；不同相的出现导致没有得到理想的ZrO2／HA复合材料，并使得复合材料的密度远小于纯HA的。

The mixed-powder of Ca3 （PO4）2 and Ca（OH）2 in different proportions with different ZrO2 powder contents was made into slurry. The hydroxyapatite （HA） was obtained after the pressed milled slurry was presintered. ZrO2/HA composite powders were synthesized at different sintering temperatures, which phaseds were analyzed by using XRD. The results show that β-Ca3 （PO4）2 and t-ZrO2 phases were formed in the ZrO2/HA composite powder after sintering the raw material powders at 1 000℃ for 4 h. After sintering at 1 050- 1 350 ℃ for 4 h, the composite with lower ZrOz content （〈10%） sintered at relative high temperature （〉1 200 ℃）, CaZrO3 phase was found. And the composite with higher ZrO2 content （〉30%）, t-ZrO2 phase amount increased as CaZrO3 phase amount decreased at each temperature period. In 1 050-1 200 ℃, HA decomposed faster and t-ZrO2 stability was improved. In 1 200--1 300 ℃, HA stopped decomposing. No ideal ZrO2/HA composite was obtained , which was caused of various phases forming that leading to a overall reduced density as compared to that of pure HA.