Effect of porosity reduction by compaction on compressive strength and microstructure of calcium phosphate cement
Effect of porosity reduction by compaction on compressive strength and microstructure of calcium phosphate cement
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DOI：
10.1002/jbm.1074
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发表时间：
2002-02-01
期刊：
影响因子：
--
通讯作者：
Knowles, JC
中科院分区：
文献类型：
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作者：
Barralet, JE;Gaunt, T;Knowles, JC
羟基磷灰石（HA）磷酸钙骨水泥（CPC）是骨科应用的有吸引力的材料，因为它们可以在植入过程中成型。然而，它们的低强度和脆性性质限制了它们的潜在应用，主要是非承载应用。HA骨水泥系统几乎未被用作预置HA骨移植物的生产路线，尽管预置HA骨移植物不是可模塑糊剂，但与HA烧结陶瓷不同，HA骨移植物是可吸收的。据了解，水泥的强度可以增加到超过可达到的从浆料系统通过压实，本研究调查是否压实显着改变的比表面积和孔径分布的CPC制备根据布朗和周的方法。使用18和106 MPa之间的压实压力将孔隙率从50%降低到31%，这导致湿抗压强度从4 MPa增加到37 MPa。发现Weibull模量随着孔隙率的降低而增加;此外，大于反应物粒度的孔隙率的量随着孔隙率的降低而增加。有人提出，这是由制造中使用的水性溶剂产生的空隙和反应时发生的收缩的组合引起的。比表面积通过压实而不变。(C)John Wiley Sons，Inc.
Hydroxyapatite (HA) calcium phosphate cements (CPCs) are attractive materials for orthopedic applications because they can be molded into shape during implantation. However their low strength and brittle nature limits their potential applications to principally non-load-bearing applications. Little if any use has been made of the HA cement systems as manufacturing routes for preset HA bone grafts, which although not moldable pastes, are resorbable, unlike HA sintered ceramic. It is known that the strength of cements can be increased beyond that attainable from slurry systems by compaction, and this study investigates whether compaction significantly alters the specific surface area and pore-size distribution of CPC prepared according to the method of Brown and Chow. Compaction pressures of between 18 and 106 MPa were used to decrease the porosity from 50 to 31%, which resulted in an increase in the wet compressive strength from 4 to 37 MPa. The Weibull modulus was found to increase as porosity decreased; in addition the amount of porosity larger than the reactant particle size increased as porosity decreased. It is proposed that this was caused by a combination of voids created by the aqueous solvent used in fabrication and shrinkage that occurs on reaction. The specific surface area was unchanged by compaction. (C) 2001 John Wiley Sons, Inc.