Preparation of Composite Ceramic Powder by the Constant Composition Method

用等组成方法控制羟基磷灰石在各种陶瓷粉末晶种上的生长，该方法是由G.H.Nancollas为了测量难溶的磷酸钙晶体的生长速度而发展起来的。以氟化钙、方解石和水滑石等钙盐为晶种，在氧化锌和氧化铝上晶化磷灰石，制备了钙磷陶瓷复合粉末。在羟基磷灰石的高过饱和度条件下，在氧化锆晶化的磷灰石中生成磷酸八钙。采用KF溶液浸渍法制备的氟化钙和含氟氧化锆粉制备了含氟磷灰石。氟的存在可以抑制磷酸八钙对磷灰石结晶的污染。刷石和方解石上均未发现磷灰石。

The crystal growth of hydroxyapatite on seed crystals of various ceramic powder was controlled by the constant composition method, which was developed by G.H. Nancollas for the purpose of measurement for growth rates of sparingly soluble calcium phosphate crystals. For the purpose of preparation of calcium-phosphate-and ceramic composite powder, calcium salts such as calcium fluoride, calcite and brushite were used for seed crystals while apatites were crystallized on zerconia and alumina. Under the conditions of high oversaturation to hydroxyapatite, octacalcium phosphate formed in crystallized apatites on zircoia. Fluorine-bearing apatites were obtained on calcium fluoride and fluorine-containg zirconia prepared by immersion of KF solution. The presence of fluorine may restrain contamination of octacalcium phosphate on crystallization of apaties. No apatite was obtained on brushite or calcite.