Abstract

Tungsten carbide reinforced brass matrix composites with 30 and 70 wt% brass were synthesized by mechanical milling and densification of brass/tungsten carbide powder mixtures. Two different sintering methods included pressureless and spark plasma sintering were applied for densification of the milled powders. The relative density of the spark plasma sintered samples was much higher than those of the pressureless sintered ones confirming higher microstructural densification during spark plasma sintering. The hardness of the spark plasma sintered composites containing 30 and 70 wt% brass were 303 and 175 Vickers, respectively which was about five times more than those of the pressureless sintered composites with similar weight percent of brass. In addition, the wear performance of the composites was investigated by the pin on disc method. The spark plasma sintered samples with 30 wt% brass showed the highest wear resistant among the processed samples owing to their higher hardness. The microscopic observations revealed that delamination and adhesion were the dominant wear mechanisms for the pressureless and spark plasma sintered composites, respectively. The bending strength of the spark plasma sintered samples with 30 and 70 wt% brass were 329 and 453 MPa, respectively.

Graphic Abstract

中文翻译：

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无压和火花等离子烧结工艺生产的WC/黄铜复合材料的显微组织、力学性能和磨损性能

摘要

通过机械研磨和致密化黄铜/碳化钨粉末混合物，合成了含 30 和 70 重量％黄铜的碳化钨增强黄铜基复合材料。两种不同的烧结方法包括无压烧结和放电等离子烧结，用于研磨粉末的致密化。放电等离子体烧结样品的相对密度远高于无压烧结样品的相对密度，这证实了放电等离子体烧结过程中更高的微观结构致密化。含有 30 和 70 wt% 黄铜的放电等离子烧结复合材料的硬度分别为 303 和 175 维氏硬度，这大约是具有类似重量百分比黄铜的无压烧结复合材料的硬度的 5 倍。此外，复合材料的磨损性能通过销盘法进行了研究。含 30 wt% 黄铜的放电等离子烧结样品由于其较高的硬度而在加工样品中表现出最高的耐磨性。微观观察表明，分层和粘附分别是无压和放电等离子烧结复合材料的主要磨损机制。含 30 和 70 重量％黄铜的放电等离子体烧结样品的弯曲强度分别为 329 和 453 MPa。

图形摘要