Hydroxyapatite was prepared by co precipitation method.PVA,anhydrous ethanol and citric acid were used as dispersing agents to compare the dispersion effects of three dispersants and to explore the optimum parameters for the preparation of hydroxyapatite.The experimental results show that the use of 0.2 mol/L Ca(NO3 )2 solution as raw materials and 0.5 mol/L ethanol as dispersant for preparation of HAP powder particle size minimum;after 1100 ℃ strength of ce-ramic samples after sintering best;adding glass powder can increase the strength of ceramics,and glass powder content in-creased with increased intensity of glass powder is added;in HAP powder,ceramic shrinkage,density becomes smaller, and can improve the ceramic porosity and acid resistance,the porosity rate and acid resistant ceramic ashes best.%采用共沉淀法制备羟基磷灰石,并在制备过程中引入PVA、无水乙醇和柠檬酸作分散剂,比较这3种分散剂的分散效果并探讨了最佳工艺参数.实验结果表明:使用0.2mol/L的Ca(NO3)2溶液为原料,以0.5mol/L无水乙醇作为分散剂制备的HAP粉体产物粒径最小;经过1100℃烧结的陶瓷样品强度最高;添加玻璃粉可增加陶瓷强度,并随着玻璃粉含量的增加,强度也增大;在HAP粉体中添加玻璃粉,使陶瓷的线收缩率、密度变小,同时可提高陶瓷的气孔率和耐酸性,其中骨灰陶瓷的气孔率和耐酸性最好.
展开▼
