(中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 在無壓條件下，采用添加CaF2法制備了羥基磷灰石氧化鋯致密材料， 并研究了CaF2含量對HA-ZrO2材料的致密化、 微觀結(jié)構(gòu)和力學(xué)性能的影響。 結(jié)果顯示： 在HA-ZrO2（10％～40%， 質(zhì)量分?jǐn)?shù)， 下同）復(fù)合材料中添加CaF2，使HA變成了分解溫度高的氟部分取代羥基的磷灰石FHA， 材料的密度和力學(xué)性能（抗彎強(qiáng)度和斷裂韌性）明顯提高；加入6%（質(zhì)量分?jǐn)?shù)）CaF2經(jīng)1 350 ℃燒結(jié)4 h后， HA-ZrO2（10％～40%）的相對密度均達(dá)到95%， 抗彎強(qiáng)度達(dá)到100～120 MPa， 斷裂韌性提高到1.2～1.6 MPa·m1／2； 隨ZrO2含量的升高， HA-ZrO2致密度有所下降； 而當(dāng)CaF2含量為6%， ZrO2含量高于40%時， HA-ZrO2復(fù)合材料中形成α-Ca3(PO4)2、 HA/ZrO2固溶體或立方氧化鋯， 導(dǎo)致復(fù)合材料的力學(xué)性能下降。
關(guān)鍵字: HAZrO2復(fù)合材料； 致密化； 力學(xué)性能
hydroxyapatite-zirconia composite materials
（ State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract: Densified HA-ZrO2 composites were fabricated by adding CaF2 under pressureless condition. The effects of CaF2 content on the densification, phase compositions, microstructures and mechanical properties of HA-ZrO2 composites were investigated. The results show that the reaction between CaF2 and HA leads to the formation of fluorine partially substituted hydroxyapatite FHA with higher thermal stability, which enhances the densification, microstructures and mechanical properties of HA-ZrO2 composites. When the HA(10%-40%, mass fraction)-ZrO2 composites adding 6% CaF2 were sintered at 1 350 ℃ for 4 h, their theoretical densities can reach more than 95%. Fractural strength reaches 100-200 MPa and fracture toughness can enhance 1.2-1.6 MPa·m1／2. The effects of zirconia on phase compositions and mechanical properties were also studied. The densities of HA-ZrO2 composites decrease with increasing ZrO2 contents. When the mass fraction of CaF2 is above 6% and that of ZrO2 is above 40%, formations of CaZrO3, αCa3(PO4)2, HA/ZrO2 solid solution, and c-ZrO2 lead to the poorer mechanical property of HA-ZrO2 composites.
Key words: HA-ZrO2 composites; densification; mechanical properties
