Purpose

The purpose of this paper is to understand the effect of particle content, applied load and sliding speed on the tribological properties of A356-SiCP composites manufactured using a newly developed vacuum stir casting technique.

Design/methodology/approach

A356 alloy reinforced with 10, 15 and 20 vol% SiC particles was prepared by vacuum stir casting. Tribological tests were carried out on block-on-ring tribometer under dry sliding conditions, room temperature. Wear mechanism was investigated by scanning electron microscope and energy dispersion spectrum.

Findings

SiCP is homogeneously dispersed in the matrix. The increase in SiCP content decrease wear rate, but it leads to an increase in coefficient of friction. The wear rate increase and friction coefficient present different variation trends with increasing load. For A356-20%SiCP composite, when the load is less than 10 MPa, wear rate and friction coefficient under sliding speed of 400 rpm are lower than those of 200 rpm. Wear mechanism transition from abrasion, oxidation, delamination, adhesion to plastic flow as load and sliding speed increasing.

Practical implications

Results of this study will help guide the use of A356-SiCP in many automotive products such as brake rotors, brake pads, brake drums and pistons.

Originality/value

There are few paper studies the effect of particle content, applied load and sliding speed on the tribological properties of A356-SiCP composites. Aluminum matrix composites with uniform distribution of reinforcing particles were successfully prepared by using the newly developed vacuum stir casting technique.

中文翻译：

---

真空搅拌铸造A356-SiCP铝基复合材料的干滑动摩擦学性能

目的

本文的目的是了解颗粒含量、施加的载荷和滑动速度对使用新开发的真空搅拌铸造技术制造的 A356-SiCP 复合材料的摩擦学性能的影响。

设计/方法/方法

通过真空搅拌铸造制备了 10、15 和 20 vol% SiC 颗粒增强的 A356 合金。摩擦学测试是在干燥滑动条件下，室温下在块环摩擦计上进行的。通过扫描电镜和能量色散谱研究磨损机理。

发现

SiCP 均匀分散在基体中。SiCP 含量的增加会降低磨损率，但会导致摩擦系数增加。磨损率增加和摩擦系数随着载荷的增加呈现不同的变化趋势。对于A356-20%SiCP复合材料，当载荷小于10 MPa时，400 rpm滑动速度下的磨损率和摩擦系数低于200 rpm。随着载荷和滑动速度的增加，磨损机制从磨损、氧化、分层、粘附向塑性流动过渡。

实际影响

这项研究的结果将有助于指导 A356-SiCP 在许多汽车产品中的使用，例如刹车盘、刹车片、刹车鼓和活塞。

原创性/价值

很少有论文研究颗粒含量、外加载荷和滑动速度对 A356-SiCP 复合材料摩擦学性能的影响。采用新开发的真空搅拌铸造技术成功制备了增强颗粒分布均匀的铝基复合材料。