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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Whisker-reinforced bioactive composites containing calcium phosphate cement fillers: Effects of filler ratio and surface treatments on mechanical properties
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Whisker-reinforced bioactive composites containing calcium phosphate cement fillers: Effects of filler ratio and surface treatments on mechanical properties

机译：晶须增强的含磷酸钙水泥填料的生物活性复合材料：填料比例和表面处理对机械性能的影响

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Calcium phosphate cement (CPC) sets to form microporous solid hydroxyapatite with excellent osteoconductivity, but its brittleness and low strength prohibit use in stress-bearing locations. The aim of this study was to incorporate prehardened CPC particles and ceramic whiskers in a resin matrix to improve the strength and fracture resistance, and to investigate the effects of key microstructural variables on composite mechanical properties. Two types of whiskers were used: silicon nitride, and silicon carbide. The whiskers were surface-treated by fusing with silica and by silanization. The CPC particle fillers were either silanized or not silanized. Seven mass ratios of whisker-silica/CPC were mixed: 0:1 (no whisker-silica), 1:5, 1:2, 1:1, 2:1, 5:1, and 1:0 (no CPC). Each powder was blended with a bisphenol-a-glycidyl methacrylate-based resin to harden in 2 X 2 X 25 mm molds by two-part chemical curing. The specimens were tested in three-point flexure to measure strength, work-of-fracture (toughness), and elastic modulus. Two-way analysis of variance was used to analyze the data, and scanning electron microscopy was used to examine specimen fracture surfaces. The whisker-silica/CPC ratio had significant effects on composite properties (p < 0.001). When this ratio was increased from 0:1 to 1:0, the strength was increased by about three times, work-of-fracture by five times, and modulus by two times. Whisker surface treatments and CPC filler silanization also had significant effects (p < 0.001) on composite properties. Scanning electron microscopy revealed rough fracture surfaces for the whisker composites with steps and whisker pullout. Resin remnants were observed on the surfaces of the pulled-out whiskers, indicating strong whisker-matrix bonding. In conclusion, incorporating highly osteoconductive CPC fillers and ceramic whiskers yielded composites with substantially improved mechanical properties compared with composites filled with CPC particles without whiskers. The composite properties were determined by whisker-to-CPC ratio and filler surface treatments.
机译：磷酸钙水泥（CPC）固结形成具有优异骨传导性的微孔固体羟基磷灰石，但其脆性和低强度使其无法在承受应力的位置使用。这项研究的目的是在树脂基体中加入预硬化的CPC颗粒和陶瓷晶须，以提高强度和抗断裂性，并研究关键的微结构变量对复合材料力学性能的影响。使用了两种类型的晶须：氮化硅和碳化硅。晶须通过与二氧化硅融合和硅烷化进行了表面处理。将CPC颗粒填料硅烷化或不硅烷化。混合了七个质量比的晶须/ CPC：0：1（无晶须-二氧化硅），1：5、1：2、1：1、2：1、5：1和1：0（无CPC） 。将每种粉末与基于双酚-a-缩水甘油基甲基丙烯酸酯的树脂混合，以通过两部分化学固化在2 X 2 X 25 mm模具中硬化。对样品进行三点弯曲测试，以测量强度，断裂功（韧性）和弹性模量。使用方差的双向分析来分析数据，并使用扫描电子显微镜检查试样的断裂表面。晶须/ CPC比对复合材料的性能有显着影响（p <0.001）。当该比率从0：1增加到1：0时，强度增加大约3倍，断裂功增加5倍，模量增加2倍。晶须表面处理和CPC填料硅烷化对复合材料的性能也有显着影响（p <0.001）。扫描电子显微镜显示晶须复合材料的粗糙断裂表面具有阶梯和晶须拔出。在拔出的晶须表面上观察到树脂残留物，表明晶须与基体之间的牢固结合。总之，与填充无须晶须的CPC颗粒的复合材料相比，掺入具有高骨传导性的CPC填料和陶瓷晶须所制得的复合材料的机械性能大大提高。通过晶须与CPC之比和填料表面处理来确定复合材料的性能。

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