摘要
采用湿法合成的方法,利用Ca(OH)2和H3PO4反应,通过控制反应温度和pH大小,探讨形成HA相的纯度、粒子的尺寸和形貌.试验表明:初期产物的胶体溶液形貌为竹叶状,干燥后呈小颗粒的团聚状,烧结后HA呈六方晶体形貌.在pH=8,25℃/10h合成时,主要形成β-Ca3(PO4)2,并有Ca8H2(PO4)6的残留和Ca9HPO4(PO4)5OH生成.随着温度提高,主要相为HA,当温度为60℃时,可生成纯HA.当pH=10时,生成HA相与反应温度关系不大,均为纯HA.纳米HA的晶粒大小随着温度升高,粒子长大加剧,分散效果下降.可以通过温度来控制纳米HA的大小,通过提高碱度来提高反应合成HA的纯度.
Hydroxyapatite(HA) was synthesized by a wet chemical method using phosphoric acid(H_3PO_4) and calcium hydroxide(Ca(OH)_2) aqueous solution. The effect of synthesizing temperature and alkalinity on the purity, size and shape of HA was investigated. Results showed that the initial HA powder was needle-like shape in colloid solution and gathered to be granule after being dried, then hexagonal shape after being calcined. In the condition of pH 8, the main product was β-Ca_3(PO_4)_2 with a little of Ca_8H_2(PO_4)_6 and Ca_9HPO_4(PO_4)_5OH at 25℃ for 10 hours. When the synthetic temperature raised, the main product was HA and some Ca_9HPO_4(PO_4)_5OH still remained. When the synthetic temperature reached 60℃, pure HA were obtained. In the condition of pH 10, the product was HA and the synthetic temperature had little influence on the products. Companied with the raise of temperature, the size of HA particle increased. In a summary, it can be concluded that pH values have important effect on the purity of HA and particle size is closely related with the synthetic temperature.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2005年第3期284-286,共3页
Materials Science and Technology
基金
黑龙江省自然科学基金资助项目(E0232).
