Abstract

Calcium phosphate ceramics, with the phase composition represented by β-calcium pyrophosphate β-Ca₂P₂O₇, was obtained from a powder mixture of calcium hydroxyapatite Ca₁₀(PO₄)₆(OH)₂, monocalcium phosphate monohydrate Ca(H₂PO₄)₂ · H₂O, and sodium hydrogen phosphate Na₂HPO₄. The powder mixture was preliminarily homogenized in acetone using a planetary mill. This treatment resulted in the chemical reaction between the starting components to form monetite, calcium hydrogen phosphate CaHPO₄ (precursor of calcium pyrophosphate Ca₂P₂O₇). According to the XRD data, sodium hydrogen phosphate Na₂HPO₄ when present in an amount of 5 wt % in the starting mixture had no effect on the phase composition of the powder after homogenization and of the ceramics after annealing. Sodium pyrophosphate Na₄P₂O₇ formed from sodium hydrogen phosphate Na₂HPO₄ as a result of thermal conversion had a significant effect on sintering mechanism and the microstructure of the ceramics. A ceramics with a low sintering temperature based on β-calcium pyrophosphate β-Ca₂P₂O₇ was obtained for the first time from a powder system, upon preparation of which under mechanical activation conditions homogenization of components and synthesis of the main crystal phase precursor were combined.

中文翻译：

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基于机械活化条件下均质的羟基磷灰石钙，一水合一磷酸钙和磷酸氢钠粉末混合物的陶瓷

摘要

磷酸钙陶瓷，与相组成表示由β-焦磷酸钙β-的Ca ₂ P ₂ ö ₇，从钙羟基磷灰石的Ca的粉末混合物，得到₁₀（PO ₄）₆（OH）₂，磷酸一钙一水合物的Ca（H ₂ PO ₄）₂ ·H ₂ O和磷酸氢钠Na ₂ HPO ₄。使用行星式研磨机将粉末混合物在丙酮中预先均化。该处理导致起始组分之间发生化学反应，从而形成三水铝石，磷酸氢钙CaHPO ₄（焦磷酸钙Ca ₂ P ₂ O _7的前体）。根据XRD数据，当磷酸氢钠Na ₂ HPO ₄以5重量％的量存在于起始混合物中时，对均质化后的粉末和退火后的陶瓷的相组成没有影响。热转化的结果是由磷酸氢钠Na ₂ HPO ₄形成的焦磷酸钠Na ₄ P ₂ O ₇对陶瓷的烧结机理和微观结构有重大影响。具有低烧结温度的陶瓷基于β-焦磷酸钙β-的Ca ₂ P首次从粉末系统中获得₂ O ₇，在制备时在机械活化条件下将组分均化和主晶相前体的合成结合在一起。