The mechanical (hardness and elastic modulus) and tribological (friction force and wear rate) properties of the Fe–Cu–Ni–Sn–VN composites produced by cold pressing and subsequent vacuum hot pressing at different temperatures are studied. The starting iron, copper, nickel, and tin powders have 5–50 μm particles and the vanadium nitride powder has 0.1–0.7 μm particles. When vacuum hot pressing temperature rises from 800 to 1000°C, the hardness increases from 3.75 to 5.37 GPa and the elastic modulus decreases from 176 to 125 GPa. As a result, the friction force reduces from 115 to 80 mN and the wear rate from 1.93 ∙ 10 –5 to 0.45 ∙ 10 –5 mm 3 ∙ N –1 ∙ m –1 . The factors promoting improvement of the mechanical and tribological properties of the sintered composites are discussed. In particular, the main factor improving the mechanical properties is that the grains are refined from 5–50 μm to 20–400 nm through the α → γ → α transformation when VN dissolves in α-Fe. In this case, the composite consists of a supersaturated solid solution of nitrogen and vanadium in α-iron, intermetallic Cu 9 NiSn 3 , and primary and secondary particulate vanadium nitride phases. A relationship between the structure and mechanical and tribological properties is established. The H / E and H 3 / E 2 parameters that describe the elastic strain resistance and plastic strain resistance correlate with the wear resistance. The sintered composites are regarded as promising materials for developing a new generation of diamond-containing composites for stone processing industry.

中文翻译：

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真空热压温度对 Fe-Cu-Ni-Sn-VN 复合材料力学和摩擦学性能的影响

研究了通过冷压和随后的真空热压在不同温度下生产的 Fe-Cu-Ni-Sn-VN 复合材料的机械（硬度和弹性模量）和摩擦学（摩擦力和磨损率）性能。起始铁、铜、镍和锡粉的颗粒为 5-50 μm，氮化钒粉的颗粒为 0.1-0.7 μm。当真空热压温度从800℃升高到1000℃时，硬度由3.75GPa增加到5.37GPa，弹性模量由176GPa减少到125GPa。结果，摩擦力从 115 减少到 80 mN，磨损率从 1.93 ∙ 10 –5 减少到 0.45 ∙ 10 –5 mm 3 ∙ N –1 ∙ m –1 。讨论了促进烧结复合材料力学和摩擦学性能改善的因素。特别是，提高力学性能的主要因素是当 VN 溶解在 α-Fe 中时，通过 α → γ → α 转变，晶粒从 5-50 μm 细化到 20-400 nm。在这种情况下，复合材料由氮和钒在 α-铁中的过饱和固溶体、金属间化合物 Cu 9 NiSn 3 以及初级和次级颗粒状氮化钒相组成。建立了结构与机械和摩擦学特性之间的关系。描述弹性应变阻力和塑性应变阻力的 H / E 和 H 3 / E 2 参数与耐磨性相关。烧结复合材料被认为是开发用于石材加工行业的新一代含金刚石复合材料的有前途的材料。