Purpose

Aviation field requires a material with greater tribological characteristics to withstand the critical climate conditions. Hence, it is of paramount importance to enhance the wear resistance of material. AZ91D magnesium alloy is a light weight material used in the aviation field for the construction work. The purpose of this study is to augment the wear properties of AZ91D alloy by reinforcing with hard particles such as tungsten carbide (WC) and silicon dioxide (SiO₂).

Design/methodology/approach

In this work, three types of composites were fabricated, namely, AZ91D – WC, AZ91D – SiO₂ and AZ91D – (WC + SiO₂) by ball milling method, and the tribological properties were analyzed using pin-on-disc apparatus.

Findings

Results showed that the hardness of AZ91D alloy was greatly improved due to the reinforcing effects of WC and SiO₂ particles. Wear study showed that wear rate of AZ91D alloy and its composites increased with the increase of applied load due to ploughing effect and decreased with the increase of sliding speed owing to the formation of lubricating tribolayer. Further, the AZ91D – (WC + SiO₂) composite exhibited the lower wear rate of 0.0017 mm3/m and minimum coefficient of friction of 0.33 at a load of 10 N and a sliding speed of 150 mm/s due to the inclusion of hybrid WC and SiO₂ particles. Hence, the proposed AZ91D – (WC + SiO₂) composite could be a suitable candidate to be used in the aviation applications.

Originality/value

This work is original which deals with the effect of hybrid particles, i.e. WC and SiO₂ on the wear performance of the AZ91D magnesium alloy composites. The literature review showed that none of the studies focused on the reinforcement of AZ91D alloy by the combination of carbide and metal oxide particles as used in this investigation.

中文翻译：

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AZ91D镁合金复合材料的摩擦学行为：混合WC-SiO2纳米颗粒的影响

目的

航空领域需要具有更大摩擦学特性的材料来承受恶劣的气候条件。因此，提高材料的耐磨性至关重要。AZ91D 镁合金是一种轻质材料，用于航空领域的建筑工作。本研究的目的是通过用硬质颗粒如碳化钨 (WC) 和二氧化硅 (SiO ₂ )增强来增强 AZ91D 合金的磨损性能。

设计/方法/方法

在这项工作中，通过球磨法制备了三种类型的复合材料，即 AZ91D – WC、AZ91D – SiO ₂和 AZ91D – (WC + SiO ₂ )，并使用针盘装置分析了摩擦学性能。

发现

结果表明，由于WC和SiO ₂颗粒的增强作用，AZ91D合金的硬度大大提高。磨损研究表明，AZ91D合金及其复合材料的磨损率由于耕作效应随着施加载荷的增加而增加，并且由于润滑摩擦层的形成而随着滑动速度的增加而降低。此外，AZ91D – (WC + SiO ₂ ) 复合材料在 10 N 负载和 150 mm/s 滑动速度下由于包含混合材料，表现出较低的磨损率 0.0017 mm3/m 和 0.33 的最小摩擦系数WC和SiO ₂颗粒。因此，提议的 AZ91D – (WC + SiO ₂ ) 复合材料可能是用于航空应用的合适候选材料。

原创性/价值

这项工作是原创的，它涉及混合颗粒，即WC 和SiO ₂对AZ91D 镁合金复合材料的磨损性能的影响。文献综述表明，没有一项研究侧重于通过本研究中使用的碳化物和金属氧化物颗粒的组合来增强 AZ91D 合金。