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PHASE INTERACTIONS IN MONOCLINIC ZIRCONIA REINFORCED HYDROXYLAPATITE BIOCERAMICS

机译:单相氧化锆增强羟基磷灰石生物陶瓷中的相相互作用

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Hydroxylapatite composites with pure zirconia were prepared with pressureless air sintering and hot pressing for 1 hour at different temperatures between 900℃ and 1300℃. The interaction between the phases was monitored with XRD and thermal analysis. At sintering temperatures higher than 1000℃, an apparent Ca diffusion occurred from hydroxylapatite to pure zirconia phase and changed its structure from monoclinic to tetragonal/cubic. In the mean time, hydroxylapatite decomposed and formed tricalcium phosphate. Also, a reaction was occurred at 1220℃ between hydroxylapatite and zirconia phase forming CaZrO_3. The existence of air in the processing environment increased the reactivity between hydroxylapatite and zirconia.
机译:采用无压空气烧结法,在900℃至1300℃的不同温度下热压1小时,制备了纯氧化锆羟基磷灰石复合材料。用XRD和热分析监测相之间的相互作用。在高于1000℃的烧结温度下,Ca从羟基磷灰石向纯氧化锆相发生了明显的扩散,其结构从单斜晶变为四方晶/立方晶。同时,羟磷灰石分解并形成磷酸三钙。另外,在1220℃下,羟基磷灰石与氧化锆相之间发生了反应,形成CaZrO_3。加工环境中空气的存在增加了羟基磷灰石与氧化锆之间的反应性。

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