Enhanced properties of the Cu-10 wt% graphite composites by two-step spark plasma sintering method at the presence of Al addition

Results in Materials Pub Date : 2025-03-12 DOI:10.1016/j.rinma.2025.100686

R. Khosravi Zeydabadi, M. Sobhani

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Abstract

In the present study, Cu-10 wt% graphite composites were fabricated using powder metallurgy and spark plasma sintering (SPS) combined with the two-step sintering (TSS) method. The impact of 2 wt% aluminum powder additive on the sintering process and the properties of the resulting composites was investigated. Various sintering schedules were applied to achieve optimal properties in the composites. Single-step sintering was conducted at temperatures of 550, 600, and 650 °C, while two-step sintering (TSS) involved an initial temperature (T₁) of 600 °C followed by a second temperature (T₂) of 550 °C. The composites prepared using the TSS method exhibited a minimum friction coefficient of 0.23 and showed lower weight loss in sliding wear tests. The hardness of the composites containing 2 wt% Al reached approximately 88.5 BHN, while the electrical conductivity decreased by about 10 % compared to composites without Al addition. X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDX) confirmed the formation of a solid solution of aluminum in the copper matrix during sintering. Microstructural observations revealed well-dispersed graphite particles within the matrix.

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通过两步火花等离子烧结法提高铜-10 wt%石墨复合材料在添加铝时的性能

采用粉末冶金和放电等离子烧结（SPS）相结合的两步烧结（TSS）法制备了cu - 10wt %石墨复合材料。研究了2 wt%铝粉添加剂对复合材料烧结过程和性能的影响。采用不同的烧结工艺以获得最佳的复合材料性能。单步烧结在550、600和650℃的温度下进行，而两步烧结（TSS）的初始温度（T1）为600℃，第二步烧结（T2）为550℃。采用TSS方法制备的复合材料在滑动磨损试验中，摩擦系数最小为0.23，重量损失较小。与未添加Al的复合材料相比，添加2 wt% Al的复合材料硬度达到88.5 BHN左右，电导率下降约10%。x射线衍射（XRD）和能量色散x射线分析（EDX）证实，在烧结过程中，铝在铜基体中形成了固溶体。显微结构观察显示，石墨颗粒在基体中分散良好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Results in Materials

CiteScore

5.30

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0.00%

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