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研究了热压成型气氛对超高分子量聚乙烯(UHMWPE)力学和生物摩擦学性能的影响.分别在常规气氛和10-3 Pa的低真空环境下通过热压成型工艺制备UHMWPE试样,对其断口形貌、密度、球压痕硬度、冲压剪切强度、抗划痕性能和生物摩擦学性能进行测试分析.结果表明,常规气氛模压成型UHMWPE会在试样内部残留有气孔缺陷;低真空环境下模压成型UHM-WPE能有效地消除试样内的气孔缺陷,并增加其密度、硬度、冲压剪切强度和抗划痕性能.小牛血清润滑下的往复式摩擦磨损结果显示,低真空环境模压成型UHMWPE试样的耐磨性能比常规气氛模压成型的耐磨性能提高18.9%.
The effects of hot press forming atmosphere on the mechanical and biological tribological properties of ultrahigh molecular weight polyethylene (UHMWPE) were studied.The UHMWPE samples were prepared by hot press molding under normal atmosphere and low vacuum environment of 10-3 Pa respectively, Fracture surface morphology, density, ball indentation hardness, punching shear strength, scratch resistance and biological tribological properties were tested and analyzed.The results showed that conventional atmospheric molding UHMWPE residual pores in the sample defects; low vacuum environment Under the molding of UHM-WPE can effectively eliminate the porosity defects in the sample, and increase its density, hardness, punching shear strength and scratch resistance performance under reciprocal frictional wear of bovine serum lubrication results show that the low vacuum environment The wear resistance of the molded UHMWPE samples increased by 18.9% compared with that of the conventional molding.