Abstract

The effect of the addition of CrB₂ in the amount of 0 to 8 wt % on the microstructure, microhardness, elastic modulus, friction coefficient, and wear resistance of the Fe–Cu–Ni–Sn composites formed by cold pressing and subsequent sintering with hot pressing is investigated. It is found that an increase in the content of CrB₂ in the composition of the composite material is accompanied by an increase in its hardness and elastic modulus. The coefficient of friction and the wear rating, as well as the H/E and H³/E² parameters—which describe the resistances of a material to the elastic fracture deformation and to plastic deformation, respectively—decrease with an increase in the content of CrB₂ to 2 wt % and increase with an increase in the content of the additive. A substantial increase in the wear resistance of the sample containing 2 wt % of CrB₂ compared to the initial sample is caused by the formation of fine-grained microstructure and by the optimal combination of hardness and elastic modulus values. Tribological tests of sintered samples on pin-on-disc and Calo testers indicate substantial improvement of functional properties of the developed composite containing 2 wt % of CrB₂.

中文翻译：

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Fe-Cu-Ni-Sn材料中不同含量的CrB 2用作含金刚石复合材料的力学和摩擦学性能

摘要

CrB ₂的添加量为0到8 wt％对通过冷压和随后烧结形成的Fe-Cu-Ni-Sn复合材料的显微组织，显微硬度，弹性模量，摩擦系数和耐磨性的影响研究热压。发现在复合材料的组成中CrB ₂含量的增加伴随着其硬度和弹性模量的增加。摩擦系数和磨损等级，以及H / E和H ³ / E ²参数（分别描述材料对弹性断裂变形和塑性变形的抵抗力）随CrB ₂含量增加到2 wt％而减小，随添加剂含量的增加而增加。与初始样品相比，包含2 wt％CrB ₂的样品的耐磨性显着提高是由于形成了细晶粒的微观结构以及硬度和弹性模量值的最佳组合。在针盘和Calo测试仪上对烧结样品进行的摩擦学测试表明，所开发的复合材料的CrB ₂含量为2 wt％，其功能性能得到了显着改善。