摘要
采用高能球磨法制备超细WC-Co硬质合金。研究了1 390℃真空通Ar常规烧结后再热等静压烧结(HIP),烧结温度1 320℃,80 MPa下保温60 min对WC-Co硬质合金组织和性能的影响。结果表明:1 390℃真空通Ar烧结,可获得组织细小、综合性能好的YG8、YG10超细硬质合金。其中YG8超细硬质合金硬度达93.8 HRA,抗弯强度达2 290 MPa,YG10超细硬质合金硬度达93.3 HRA,抗弯强度达2 250 MPa。真空通Ar常规烧结再HIP能提高合金的致密度,但会使WC晶粒长大,硬度、抗弯强度、矫顽磁力等性能均下降。
Ultra-fine WC-Co cemented carbides were prepared by high energy ball milling in this paper. The effects of HIP（1 320 ℃, 80 MPa, keeping for 60 min） after vacuum-sintering in Ar at 1 390 ℃ on properties of ultra-fine WC-Co cemented carbides were investigated. Experimental results show that ultra-fine YG8 and YG10 cemented carbides with fine structure and good comprehensive performance can be prepared by vacuum-sintering in Ar at 1 390 ℃. The hardness of YG8 reaches 93.8 HRA and the TRS is 2 290 MPa. The hardness of YG10 reaches 93.3 HRA and the TRS is 2 250 MPa after vacuum-sintering. HIP after vacuum-sintering can improve the density of ultra-fine WC-Co cemented carbides, but the average zrain size of WC is increased and the hardness. TRS. coercive force and other oroperties are reduced.
出处
《硬质合金》
CAS
2012年第2期101-105,共5页
Cemented Carbides
基金
国家科技重大专项(2009ZX04012-023)高效可转位刀具系列及超硬工具的研究及产业化
重庆市科委自然科学基金计划重点项目(CSTC.2010YZ0009)高效YG类稀土硬质合金的制备关键技术及应用研究
关键词
超细WC-Co硬质合金
真空
HIP
性能
ultra-fine WC-Co cemented carbides
vacuum-sintering in Ar
HIP
properties
