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首页> 外文期刊>Acta biomaterialia >Sol-gel synthesis and characterization of macroporous calcium phosphate bioceramics containing microporosity.
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Sol-gel synthesis and characterization of macroporous calcium phosphate bioceramics containing microporosity.

机译：含微孔的大孔磷酸钙生物陶瓷的溶胶-凝胶合成和表征。

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摘要

Amorphous calcium phosphate powders were precipitated from calcium metal and phosphoric acid in ethanol. Depending on the quantity of reagent, the CaP powders had different chemical compositions and, after heating, formed beta-tricalcium phosphate (beta-TCP), hydroxyapatite (HA) or BCP mixtures. Dilatometric measurements indicated that shrinkage of compacted CaP powders occurred first at around 650 degrees C and continued up to 1200 degrees C. The amorphous CaP powders were mixed with urea beads, compacted under isostatic pressure at 140 MPa and sintered at 1100 degrees C for 5 h. Scanning electron microscopy indicated that macro-microporous ceramics were produced. The ceramics had spherical macropores of 700-1200 microm in diameter, with limited interconnections and a macroporosity of 42% as determined by microcomputed tomography. The micropores ranged from 0.1 to 1 microm in diameter. These ceramics made of HA, beta-TCP or BCP exhibiting both macroporosity and microporosity can be used as bone fillers.
机译：从乙醇中的金属钙和磷酸中沉淀出无定形磷酸钙粉末。根据试剂的量，CaP粉末具有不同的化学组成，并且在加热后会形成β-磷酸三钙（β-TCP），羟基磷灰石（HA）或BCP混合物。膨胀计测量表明，压实的CaP粉末的收缩首先在650摄氏度左右发生，并持续到1200摄氏度。无定形CaP粉末与尿素珠混合，在等静压下于140 MPa压实，并在1100摄氏度下烧结5 h 。扫描电子显微镜表明产生了大孔微孔陶瓷。陶瓷具有直径为700-1200微米的球形大孔，具有有限的互连性，并且通过微计算机断层扫描法测定的大孔隙率为42％。微孔的直径范围为0.1至1微米。这些由HA，β-TCP或BCP制成的陶瓷同时具有大孔率和微孔率，可以用作骨填充剂。

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