(重慶大學(xué) 材料科學(xué)與工程學(xué)院， 重慶400044)
摘 要: 利用DTA和XRD分析技術(shù)對(duì)CaHPO4·2H2O-CaCO3和CaHPO4·2H2O-CaCO3-Y2O3 2種體系在加熱過(guò)程中的相變機(jī)理進(jìn)行了對(duì)比實(shí)驗(yàn)和研究。 結(jié)果表明： Y2O3對(duì)CaHPO4·2H2O-CaCO3混合體系在800℃以下的物理化學(xué)變化過(guò)程不產(chǎn)生影響； 但在900℃以上時(shí)， 稀土對(duì)HA生物陶瓷的原位燒結(jié)合成具有催化作用， 使反應(yīng)合成的開(kāi)始溫度降低了134℃左右， 且增加了β-TCP和HA的高溫穩(wěn)定性， 使β-TCP向α-TCP發(fā)生晶型轉(zhuǎn)變的溫度提高約47℃， 使HA的分解溫度提高約38℃。 這有利于生成更多的HA。
關(guān)鍵字: 原位合成； HA； 生物陶瓷； Y2O3
（College of Materials Science and Engineering,
Chongqing University, Chongqing 400044, China）
Abstract:On the basis of DTA and XRD measurements, the phases transformations involved in the processing of reactively in situ synthesis of HA were systematically analyzed. The results show that the addition of Y2Ｏ3 has no effect on CaHPO4·2H2O-CaCO3 mixed powders below 800℃. But when sintering temperature is higher than 900℃, the starting temperature of HA formation will be decreased by 134℃, the phase transformation temperature of β-TCP to α-TCP increased by 47℃ and the decomposing temperature of HA increased by 38℃. Therefore, Y2O3 is helpful to the in situ synthesis of HA.
Key words: in situ synthesis; HA; bioceramic; Y2O3
