| 引用本文: | 何攀,王文,强凤鸣,张莹,乔柯,王快社.热压烧结新型WC/Al0.5CoCrFeNiTi0.5硬质合金摩擦磨损性能研究[J].材料科学与工艺,2024,32(6):68-75.DOI:10.11951/j.issn.1005-0299.20230119. |
| HE Pan,WANG Wen,QIANG Fengming,ZHANG Ying,QIAO Ke,WANG Kuaishe.Research on friction and wear properties of novel WC/Al0.5CoCrFeNiTi0.5 cemented carbide fabricated by hot pressing sintering[J].Materials Science and Technology,2024,32(6):68-75.DOI:10.11951/j.issn.1005-0299.20230119. |
|
| 摘要: |
| 为抑制传统WC硬质合金在烧结制备过程中的晶粒长大,提高其使用寿命,本文以Al0.5CoCrFeNiTi0.5高熵合金为粘结剂,在不添加晶粒生长抑制剂的前提下,采用热压烧结工艺制备了粘结剂含量分别为17wt.%、20wt.%和25wt.%的WC/Al0.5CoCrFeNiTi0.5的新型硬质合金,并以相同工艺制备WC/20wt.%Co作为对照样品。研究了WC/Al0.5CoCrFeNiTi0.5新型硬质合金的微观组织、力学性能,及其在室温和800 ℃高温条件下的摩擦磨损性能。研究结果表明,在不添加晶粒生长抑制的条件下,以Al0.5CoCrFeNiTi0.5为粘结剂可以获得超细晶WC/Al0.5CoCrFeNiTi0.5硬质合金。WC/20wt.%Al0.5CoCrFeNiTi0.5硬质合金具有最好的综合力学性能,其硬度和断裂韧性分别为(2 389±12)HV30和(15.95±0.5) MPa·m1/2,均优于相同工艺制备的WC/20wt.%Co硬质合金。在室温下,WC/17wt.%Al0.5CoCrFeNiTi0.5硬质合金磨损率最小,耐磨性能最好。随着粘结剂含量增加,耐磨性能逐渐降低。WC/Al0.5CoCrFeNiTi0.5硬质合金在室温下的磨损机理主要为磨粒磨损。在800 ℃高温条件下,WC/20wt.%Al0.5CoCrFeNiTi0.5硬质合金磨损率最小,磨损机理为磨粒磨损、氧化磨损和粘着磨损。在室温和800 ℃以下,WC/Al0.5CoCrFeNiTi0.5硬质合金的磨损率均低于相同工艺制备的WC/20Co硬质合金。 |
| 关键词: 硬质合金 高熵合金粘结剂 力学性能 摩擦磨损 磨损率 |
| DOI：10.11951/j.issn.1005-0299.20230119 |
| 分类号:TG711 |
| 文献标识码:A |
| 基金项目:国家自然科学基金优秀青年科学基金项目(52222410)；陕西省杰出青年科学基金资助项目(2022JC-24). |
|
| Research on friction and wear properties of novel WC/Al0.5CoCrFeNiTi0.5 cemented carbide fabricated by hot pressing sintering |
|
HE Pan, WANG Wen, QIANG Fengming, ZHANG Ying, QIAO Ke, WANG Kuaishe
|
|
(School of Metallurgical Engineering, National and Local Joint Engineering Research Center for Functional Materials Processing, Xian University of Architecture & Technology, Xian 710055, China)
|
| Abstract: |
| To suppress the grain growth of traditional WC har alloys during the sintering process and improve their service life, this study used Al0.5CoCrFeNiTi0.5 high-entropy alloy as the binder to fabricate a novel WC/Al0.5CoCrFeNiTi0.5 cemented carbide with binder contents of 17wt.%, 20wt.% and 25wt.% through hot pressing sintering without adding grain growth inhibitors. WC/20wt.%Co was prepared using the same process as a control sample. The microstructure, mechanical properties, and friction and wear properties at room temperature and 800 ℃ were studied. The results show that ultrafine grain WC/Al0.5CoCrFeNiTi0.5 cemented carbide can be obtained by using Al0.5CoCrFeNiTi0.5 as binder without adding grain growth inhibitiors. WC/20wt.%Al0.5CoCrFeNiTi0.5 cemented carbide exhibits the best comprehensive mechanical properties, with a hardness of (2 389±12)HV30 and a fracture toughness of (15.95±0.5) MPa·m1/2, both superior to WC/20wt.%Co cemented carbide prepared by the same process. At room temperature, WC/17wt.%Al0.5CoCrFeNiTi0.5 cemented carbide shows the lowest wear rate and the best wear resistance. As the binder content increases, the wear resistance gradually decreases. The wear mechanism of WC/Al0.5CoCrFeNiTi0.5 cemented carbide at room temperature is mainly abrasive wear. Under the high temperature condition of 800 ℃, WC/20wt.%Al0.5CoCrFeNiTi0.5 cemented carbide exhibits the lowest wear rate, with wear mechanism including abrasive wear, oxidation wear and adhesive wear.Moreover, at room temperature and below 800 ℃, the wear rate of WC/Al0.5CoCrFeNiTi0.5 cemented carbide is lower than that of WC/20wt.%Co cemented carbide prepared by the same process. |
| Key words: cemented carbide high entropy alloy binder mechanical properties friction wear wear rate |
