机械合金化和铸造法制备的用于摩擦学应用的不同聚乳酸生物复合材料的比较研究

A Comparative Study of Different Poly (Lactic Acid) Bio-Composites Produced by Mechanical Alloying and Casting for Tribological Applications.

作者信息

Abir Anzum Al, Trindade Bruno

机构信息

CEMMPRE-Centre for Mechanical Engineering, Materials and Processes, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal.

出版信息

Materials (Basel). 2023 Feb 15;16(4):1608. doi: 10.3390/ma16041608.

DOI:10.3390/ma16041608

PMID:36837237

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9959764/

Abstract

The aim of this study was to fabricate different self-lubricating poly (lactic acid)-based bio-composites reinforced with mono- and multi-fillers of carbon fibers, graphene nanoparticles, and a soft Sn-based brazing alloy (Sn89-Zn8-Bi3) using a two-step process consisting of mechanical alloying followed by casting. The results showed that the incorporation of the different fillers on the PLA surface by mechanical alloying was quite homogenous. The volume ratio between the PLA and the fillers was 1:0.02, respectively. The PLA sample reinforced with short carbon fibers and graphene nanoparticles presented the highest hardness (84.5 Shore D, corresponding to a 10% increase compared to PLA) and the lowest specific wear rate (1.5 × 10 mm/N·m, one order of magnitude lower than PLA). With regard to the coefficient of friction, the lowest value was obtained for the sample reinforced with graphene (0.43, corresponding to a decrease of 12% compared to PLA).

摘要

本研究的目的是采用机械合金化后铸造的两步法，制备以聚乳酸为基础、用碳纤维单填料和多填料、石墨烯纳米颗粒以及一种软质锡基钎焊合金（Sn89-Zn8-Bi3）增强的不同自润滑生物复合材料。结果表明，通过机械合金化将不同填料掺入聚乳酸表面相当均匀。聚乳酸与填料之间的体积比分别为1:0.02。用短碳纤维和石墨烯纳米颗粒增强的聚乳酸样品具有最高的硬度（84.5邵氏D硬度，比聚乳酸提高了10%）和最低的比磨损率（1.5×10⁻⁶mm/N·m，比聚乳酸低一个数量级）。关于摩擦系数，用石墨烯增强的样品获得了最低值（0.43，比聚乳酸降低了12%）。