【摘要】 用热膨胀仪、X射线衍射仪和扫描电镜对沉淀法所制的羟基磷灰石(HA)粉体和其陶瓷坯体的烧结行为进行了研究。结果表明,球磨处理和粉体煅烧温度对HA坯体的烧结行为均有明显影响。球磨处理能减少粉体团聚,经球磨处理后,不同煅烧温度下的粉体粒径均小于100 nm,坯体在1050℃时收缩达到最大值,比未球磨处理时约低100℃。在相同烧结条件下,700℃、750℃和800℃煅烧粉体所得坯体最大收缩率分别为18%、21%和16.8%,最大收缩率对应温度分别为990℃、950℃和1000℃。750℃煅烧后的粉体的烧结性能最好,其坯体在1050℃无压烧结可得到相对密度98%的HA材料。更多还原

【Abstract】 The sintering behavior of Hydroxyapatite(HA) powders prepared by precipitation method was investigated by means of XRD,SEM and thermal dilatometer.The results showed that ball-milling treatment and calcining temperature exert an influence on sintering process of HA.Ball-milling could reduce aggregation.The average size of particles calcined at different temperatures is less than 100 nm.The temperature of the highest shrinkage of sintering body is 1050 ℃,100 ℃ lower than that without ball-milling.On the same sintering condition,the powders calcined at 700 ℃,750 ℃ and 800 ℃ showed different sintering behaviors.The highest shrinkage is 18%,21% and 16.8%,respectively.And the temperature corresponding to the highest shrinkage rate is respectively 990 ℃,950 ℃ and 1000 ℃.The powder calcined at 750 ℃ possesses a better sintering behavior.A relative density of 98% can be obtained when the powder is pressureless sintered at 1050 ℃.更多还原