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Sintering of Potassium Doped Hydroxy-Fluorapatite Bioceramics

机译：烧结掺杂羟基 - 氟磷灰石生物陶瓷的烧结

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摘要

The present study describes the influence of potassium and hydroxyl substitutions on the structural, thermal and mechanical properties of fluorapatite bioceramics. A set of non-stoichiometric ion-substituted compounds, with a chemical formula of Ca10?xKx(PO4)6F(2?2x)(OH)x with 0 ≤ x ≤ 1 synthesized by the wet precipitation method, were found to be single-phase apatites crystallizing in the hexagonal P63/m space group. The structural parameters, as well as the crystallite sizes, increased accordingly to the amount of added dopant-ions. The thermal behavior of these compounds, studied within the temperature range 500–1200 °C, indicated a partial decomposition of the apatitic phase and its transformation to tricalcium phosphate β-Ca3(PO4)2 at temperatures exceeding 750 °C. A relative density of the sintered samples achieved the highest value with x = 0.25 and reached about 95% after sintering at 1050 °C for 1 h. The microstructures of the sintered samples were of a trans-granular aspect and experienced an increase in the radius of their pores as x increased. The prepared bioceramic materials were mechanically characterized by means of Young’s modulus, flexural strength and fracture toughness measurements. The overall trend of these parameters evolved comparably to the relative density, and the maximum values obtained for x = 0.25 were measured to be 96 MPa, 47 MPa and 1.14 MPa·m1/2, respectively.
机译：本研究描述了钾和羟基取代对氟磷酸盐生物陶瓷的结构，热和力学性能的影响。发现一组非化学计量离子取代的化合物，具有通过湿沉淀法合成0≤x≤1的Ca10〜XKx（PO4）6F（2×2x）（OH）x的化学式，是单一的 - 在六边形p63 / m空间组中结晶的磷灰石。结构参数以及微晶尺寸，相应地增加到添加的掺杂剂 - 离子的量。在500-1200℃的温度范围内研究这些化合物的热行为，表明素质相的部分分解及其在超过750℃的温度下对磷酸三钙β-CA3（PO4）2的转化。烧结样品的相对密度达到X = 0.25的最高值，并且在1050℃下烧结1小时后达到约95％。烧结样品的微观结构是反式颗粒的方面，并且随着X增加而经历了孔的半径的增加。制备的生物陶瓷材料通过杨氏模量，弯曲强度和断裂韧性测量机械表征。这些参数的总体趋势与相对密度相当地演变，并分别测量X = 0.25的最大值为96MPa，47MPa和1.14MPa·M1 / 2。

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