Abstract

In the present study, WC-10Co with TiC, VC and (Ta, Nb)C as the inhibitors to the grain growth was prepared using high energy ball milling and the subsequent HIP process at various temperatures. Phase evolution and microstructural studies were performed for the milled and sintered samples by x-ray diffraction, vibrating sample magnetometry, field emission scanning electron microscopy and transmission electron microscopy. Also, the density and microhardness of the sintered samples were measured. It was found that densification and grain-growth rate were sensitive to the sintering temperature, type and overall content of the additives. The samples sintered at the higher temperature showed better densification and hardness, with lower porosities. The additives were found to have significant influence on the microstructure and properties of the sintered products. Sintered samples containing additives had considerably improved microhardness, but densification was lowered up to 4.8%. However, the highest microhardness was 1920 HV for the sample with the three types of additives sintered at 1480 °C.

Graphical Abstract

中文翻译：

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WC-Co 与 TiC、VC 和 (Ta, Nb)C 添加剂的烧结行为：微观结构和机械特征

摘要

在本研究中，WC-10Co 与 TiC、VC 和 (Ta, Nb)C 作为晶粒生长抑制剂使用高能球磨和随后的 HIP 工艺在不同温度下制备。通过 X 射线衍射、振动样品磁强计、场发射扫描电子显微镜和透射电子显微镜对研磨和烧结样品进行相演变和微观结构研究。此外，还测量了烧结样品的密度和显微硬度。发现致密化和晶粒生长速率对烧结温度、添加剂的类型和总含量敏感。在较高温度下烧结的样品显示出更好的致密化和硬度，以及更低的孔隙率。发现添加剂对烧结产品的微观结构和性能有显着影响。含有添加剂的烧结样品显微硬度显着提高，但致密化降低了 4.8%。然而，三种添加剂在 1480°C 下烧结的样品的最高显微硬度为 1920 HV。

图形概要