不同球磨悬浮体制备WC-10NiAl硬质合金的微观结构与力学性能研究

Study on Microstructure and Mechanical Properties of WC-10NiAl Cemented Carbide Prepared by Different Ball-Milling Suspension.

作者信息

Zhang Minai, Cheng Zhun, Li Jingmao, Qu Shengguan, Li Xiaoqiang

机构信息

Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming, National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China.

Department of Materials Science and Engineering, University of California, Irvine, CA 92697, USA.

出版信息

Materials (Basel). 2019 Jul 10;12(14):2224. doi: 10.3390/ma12142224.

DOI:10.3390/ma12142224

PMID:31295883

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6678106/

Abstract

In this paper, WC-10NiAl cemented carbides were prepared by the powder metallurgy method, and the effects of ball-milling powders with two different organic solvents on the microstructure and mechanical properties of cemented carbides were studied. We show that the oxygen in the organic solvent can be absorbed into the mixed powders by ball-milling when ethanol (CHCHOH) is used as a ball-milling suspension. This oxygen leads to the formation of α-AlO during sintering, which improves the fracture toughness, due to crack deflection and bridging, while the formation of η-phase (NiWC) inhibits the grain growth and increases the hardness. Alternatively, samples milled using cyclohexane (CH) showed grain growth during processing, which led to a decrease in hardness. Therefore, the increase of oxygen content from using organic solvents during milling improves the properties of WC-NiAl composites. The growth of WC grains can be inhibited and the hardness can be improved without loss of toughness by self-generating α-AlO and η-phase (NiWC).

摘要

本文采用粉末冶金法制备了WC-10NiAl硬质合金，研究了两种不同有机溶剂球磨粉末对硬质合金微观结构和力学性能的影响。我们发现，当使用乙醇（CH₃CH₂OH）作为球磨悬浮液时，有机溶剂中的氧可通过球磨被吸收到混合粉末中。这种氧在烧结过程中导致α-Al₂O₃的形成，由于裂纹偏转和桥接作用，α-Al₂O₃提高了断裂韧性，而η相（NiWC）的形成抑制了晶粒生长并提高了硬度。另外，使用环己烷（C₆H₁₂）球磨的样品在加工过程中出现晶粒生长，导致硬度降低。因此，球磨过程中使用有机溶剂导致的氧含量增加改善了WC-NiAl复合材料的性能。通过自生α-Al₂O₃和η相（NiWC），可以抑制WC晶粒的生长并提高硬度，而不会损失韧性。