在1000～1300 ℃温度范围内,就ZnO晶须(ZnO_w)对TCP/HAP双相生物陶瓷烧结行为和性能的影响进行研究,初步探讨其烧结机制,并制备出性能优良的ZnO_w增韧TCP/HAP双相生物陶瓷.采用XRD、SEM等分析手段对ZnO_w增韧TCP/HAP双相生物陶瓷的组织和性能进行了分析,并在37 ℃的模拟体液中考察了其降解性能.结果表明:ZnO_w的加入可以显著降低TCP/HAP陶瓷的烧结温度;在同一烧结温度下,随着ZnO_w添加量的增加,烧结试样的致密度增加,孔径增大,孔隙率减小;烧结后的试样主要由TCP与HAP两相组成,ZnO_w的加入未对其相组成产生明显的影响.在37 ℃的模拟体液中,ZnO_w增韧TCP/HAP双相生物陶瓷具有良好的生物降解性能.ZnO_w的加入在保证TCP/HAP双相生物陶瓷具有良好的生物降解性能的同时,使其性能接近人体松质骨,从而在骨缺损区提供一定的支撑作用.
A new kind of ZnO_w reinforced TCP/HAP composite bioceramics with good properties was fabricated with the TCP/HAP nano-composite powders in the temperature range from 1000℃ to 1300℃. The main effects of ZnO whisker (ZnO_w) on the sintering behavior and the properties of the TCP/HAP composite bioceramics were discussed. The microstructure, compositions, and properties of TCP/HAP composite bioceramics were analyzed by the means of XRD and SEM, and the degradable properties of the final products were investigated in Simulated Body Fluid (SBF) at 37℃. The results indicated that the sintering temperature could be obviously decreased with the addition of ZnO_w. At the same sintering temperature, the densities of samples were increased obviously with the increasing of ZnO_w addition. Based on XRD results, the phase composition of the sintering samples with the different contents of ZnO_w mainly consisted of TCP and HAP, which indicated that the addition of ZnO_w had no obvious effect on phase composition of the sintering products. In SBF, ZnO_w reinforced TCP/HAP composite bioceramics had good degradable properties. The addition of ZnO_w makes TCP/HAP composite bioceramics have the same properties with cancellous bone, which can act as support action in bone imperfect section.
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