羟基磷灰石/钛网状复合材料的制备及其性能

以Ca(OH)2和H3PO4为反应物,通过溶胶-凝胶法制备了羟基磷灰石(HA)粉体;用机械混合法制备了TiH2包覆HA的粉体;用热压法制备了纯HA陶瓷材料及HA/Ti复合材料.XRD相分析结果表明:通过溶胶-凝胶法制备的HA粉体,经过900℃煅烧2 h后,粉体的主晶相为HA,有少量的CaO;HA/TiH2包覆粉末经1 050℃热压后,复合材料中的主要相是HA和Ti,同时出现了Ca2P2O7和Ca3(PO4)2相.1 050℃热压的HA/25%Ti(体积分数)复合材料的断裂韧性为2.4 MPa.m-1/2,抗弯强度为54 MPa,均高于纯HA材料.显微组织的观察表明金属钛在材料中呈网状分布,网状...

Fabrication of Hydroxyapatite/Ti Network Composites

Hydroxyapatite (HA) powder was synthesized by sol-gel method with Ca(OH)2 and H3PO4 as reactants. The HA was coated with T1H2 powder using mechanical mixing method. Then the pure HA ceramics and HA/Ti composite were fabricated by hot-pressing. XRD results indicated that the predominant phase of the powder synthesized by sol-gel method and heat-treated at 900°C for 2 h is HA with a bit of CaO. The predominant phases of the HA/20vol%Ti composite that was hot-pressed at 1050°C were HA and Ti, with Ca2P2O7 and Ca3(PO4)2 shown at the same time. The fracture toughness and bending strength are 2.4 MPa·m^-1/2 and 54 MPa for HA-25vol%Ti composite hot-pressed at 1050°C, respectively, higher than pure HA ceramic. The microstructure showed that there is a netty distribution of the metal Ti in the composite, which is beneficial to the resistance to crack propagation because the mechanism of crack bridging.