Abstract The paper presents the results of studying the structure and wear resistance of compacts produced from fine dispersed reduced iron powder (average particle size 3– 5 μ m) with the addition of tungsten carbide (WC) nanopowder with the average particle size of 25–30 nm. The mass fraction of tungsten carbide (wolfram carbide) in the powder composition was 5% and 10% of the total mass. Impulse pressing was conducted using the modified Kolsky method at compacting temperatures of 20 °C to 300 °C. The produced compacts had relative density of over 90%. Metallographic studies using the scanning electronic microscopy method on a TESCAN VEGA II electronic microscope have shown that the produced compacts have a fairly homogeneous fine-grained structure, with a uniform pattern of pore distribution, the form of the pores being close to spherical. X-ray microanalysis using an INCA Energy 250 energy-dispersion spectrometer with scanning along the surface line and transversal laps testifies to the fact that, in the considered temperature range, dynamic compaction does not lead to any noticeable changes in the distribution of the Fe, W and C elements over the bulk of the specimens. The conducted measurements of micro-hardness of the compacts have shown that it increases considerably with the pressing temperature. The produced compacts were tested for wear resistance in a dry friction regime, using the ‘rotating disk – stationary specimen’ configuration. Mass loss of the compacts as a function of testing time is presented. Wear resistance of compacts depends on pressing temperature and concentration of the WC powder in the matrix of reduced iron. It has been experimentally determined that maximal wear resistance is observed in the compacts with the mass fraction of WC equal to 10%, produced at a pressing temperature of 300 °C.

中文翻译：

---

脉冲压制制备的细分散铁粉和一碳化钨纳米粉体的耐磨性实验分析

摘要 本文介绍了由细分散的还原铁粉（平均粒径 3-5 μ m）与平均粒径为 25- 的碳化钨 (WC) 纳米粉末制成的压块的结构和耐磨性研究结果。 30 纳米。粉末组合物中碳化钨（碳化钨）的质量分数为总质量的 5% 和 10%。使用改进的 Kolsky 方法在 20 °C 至 300 °C 的压实温度下进行脉冲压制。生产的压块的相对密度超过90%。在 TESCAN VEGA II 电子显微镜上使用扫描电子显微镜方法进行的金相研究表明，生产的压块具有相当均匀的细晶粒结构，孔隙分布均匀，孔隙形状接近球形。使用 INCA Energy 250 能量色散光谱仪进行 X 射线微量分析，沿表面线和横向重叠进行扫描，证明在所考虑的温度范围内，动态压实不会导致 Fe 分布的任何显着变化，大部分试样上的 W 和 C 元素。对压坯的显微硬度进行的测量表明，随着压制温度的升高，显微硬度显着增加。使用“旋转盘-固定试样”配置，对生产的压块在干摩擦状态下的耐磨性进行了测试。介绍了作为测试时间函数的压块的质量损失。压块的耐磨性取决于压制温度和还原铁基体中WC粉末的浓度。