UHMWPE的耐磨性和抗摩擦性,具有由机械压缩塑造的异型微观结构
Lucas Gimenis de Moura1, Carlos Henrique da Silva2, Rafael Mello Trommer3
1Biomechanics Engineering Laboratory, University Hospital (HU), Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.
机械压缩在超高分子量聚乙烯 (UHMWPE) 中产生异型微结构,尽管晶体性发生了变化,但增加了耐磨性. 这会影响高压力应用中的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 部落学 (tribology) 是一个学科.
- 聚合物工程 聚合物工程
背景情况:
- 超高分子量聚乙烯 (UHMWPE) 广泛用于生物医学植入物和工业应用.
- 了解UHMWPE在机械应力下的tribological行为对于优化其性能和寿命至关重要.
- 之前的研究还没有完全探索诱导的异性质微结构对UHMWPE耐磨性的影响.
研究的目的:
- 通过单轴压缩诱导的异构微观结构来研究UHMWPE的三极学行为.
- 分析滑动方向 (平行和垂直于压缩轴) 对摩擦和磨损的影响.
- 为了将微观结构的变化与严重条件下的磨损性能相关联.
主要方法:
- UHMWPE标本受到单轴压缩,以诱导异构性.
- 在超出弹性极限的负荷下进行了反复滑动试验.
- 原子力显微镜 (AFM) 和拉曼光谱被用来描述微观结构和晶体相变的特征.
主要成果:
- 单轴压缩在UHMWPE中诱导了一个永久的异型层结构.
- 滑动测试显示,与原始材料相比,塑性变形的UHMWPE的磨损易感性增加.
- 磨损测试改变了晶相分布,在两个滑动方向上观察到显著增加,甚至在LD方向上逆转异构.
结论:
- 压缩诱导的异型微结构显著影响UHMWPE的tribological行为.
- 塑性变形的UHMWPE表现出更高的磨损率,无论滑动方向或观察到的结晶性变化.
- 结果为设计高压环境的UHMWPE组件提供了关键的见解,特别是在骨科中.
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