WC粒径对WC-Co硬质合金高温耐磨性的影响  

Effect of WC Particle Size on High Temperature Wear Resistance of WC-Co Cemented Carbide

作　　者：张洪 熊计[1] 郭智兴[1] 杨天恩[1] 易建松 杨善东 梁磊 ZHANG Hong;XIONG Ji;GUO Zhixing;YANG Tian'en;YI Jiansong;YANG Shandong;LIANG Lei(School of Mechanical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学机械工程学院,四川成都610065

出　　处：《热加工工艺》2022年第2期21-24,30,共5页Hot Working Technology

基　　金：四川省重大科技专项项目(2020ZDZX0001);四川大学自贡市校地科技合作专项资金项目(2020CDZG-16);四川省科技支撑项目(2021JDTD0025)。

摘　　要：使用粉末冶金的方法制备了不同WC粒径的硬质合金,对不同WC粒径的硬质合金材料的组织和性能进行了研究,并进行了高温摩擦实验。结果表明,平均晶粒尺寸随着WC粒径的增加而增加,其WC晶粒发生异常长大的趋势更明显,晶粒分布范围更大。此外,除了韧性,硬度和强度都会随着WC粒径的增加而减小,WC粒径为2.5μm的硬质合金具有较好的综合力学性能。在室温和350℃的摩擦条件下,WC粒径为2.5μm的硬质合金的磨损率最小,但是在700℃的摩擦条件下,WC粒径为2.5μm的硬质合金与WC粒径为1μm的硬质合金的磨损率相近,且WC粒径为3.5μm的硬质合金的磨损率是其他组的2.5倍左右。硬质合金在高温摩擦下主要会形成剥落坑,磨屑以及氧化磨损,形成的WO_(3)氧化物会加剧硬质合金的磨损。Cemented ca rbides with different WC grain sizes were prepared by powder metallurgy. The structure and properties of cemented carbide materials with different WC particle size were studied, and high-temperature friction experiments were carried out. The results show that the mean grain size increases with the increase of the WC particle size.The abnormal growth of the WC grains is more obvious, and the grain distribution range is larger. In addition to toughness, in addition, hardness and strength will decrease with the increase of WC particle size. Cemented carbide with WC particle size of2.5 μm has good comprehensive mechanical properties. Under the friction conditions of room temperature and 350 ℃, the wear rate of cemented carbide with a WC particle size of 2.5 μm is the smallest, but under the friction condition of 700 ℃,and the wear rate of the cemented carbide with a WC particle size of 2.5 μm is similar to cemented carbide with WC particle size of 1 μm, and the wear rate of cemented carbide with a WC particle size of 3.5 μm is about 2.5 times that of other groups.Cemented carbide mainly forms peeling pits, wear debris and oxidative wear at high temperatures, and the formed WO_(3) oxide aggravate the wear of cemented carbide.

关 键 词：粒径 WC 硬质合金 高温摩擦 性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程]