论文部分内容阅读
通过对WC-TiC-(Ta,Nb)C-Co硬质合金在1 300～1 380℃的渗氮气氛处理和随后的脱N烧结制得了不同脱β层厚度的合金基体,通过化学气相沉积(CVD)工艺制成从内到外依次为TiN/MT-TiCN/Al2O3/TiN的涂层硬质合金。采用光学显微镜、扫描电镜和能谱仪、抗弯(TRS)和切削试验对合金基体涂层前后的组织特征与性能进行了研究。结果表明,随着脱β层厚度的增加,试样涂层前后的抗弯强度均增加,在厚度达到20μm以上时,增加不明显。CVD涂层硬质合金可转位刀片的抗冲击性能也有相应的规律,而耐磨性则基本上保持一致。
The alloy matrix with different thickness of β-layer was obtained by nitriding treatment of WC-TiC- (Ta, Nb) C-Co cemented carbide at 1300 ~ 1 380 ℃ and subsequent de-N sintering. The alloy matrix was obtained by chemical vapor deposition (CVD) process is made from inside to outside followed by TiN / MT-TiCN / Al2O3 / TiN coated cemented carbide. The microstructures and properties of the alloy matrix coating before and after the coating were studied by using optical microscope, scanning electron microscope and energy dispersive spectrometer, bending resistance (TRS) and cutting test. The results show that the bending strength before and after the coating increases with the increase of the thickness of the desilium β layer, and the increase is not obvious when the thickness is over 20 μm. CVD coated carbide indexable blade impact resistance also has the corresponding rules, while the wear resistance is basically the same.