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摘要: 以TiC与过渡族金属Nb为原料,在机械合金化(MA)下制备了多种非化学计量比的(Ti, Nb)Cx PCD刀具结合剂。通过X射线衍射仪(XRD)对复合材料烧结体进行了物相组成检测,并用jade软件对复合材料进行处理分析。通过扫描电子显微镜(SEM)对复合材料的断口形貌进行了观察,并用维氏硬度计对复合材料的硬度和断裂韧性进行力学性能测试。结果表明,在1300 ℃到1700 ℃的范围内,烧结温度越高,TiC和 Nb的固溶程度越高。在同一烧结温度下,(Ti, Nb)Cx复合材料的硬度随着金属Nb占比量变大逐渐升高,同一金属Nb占比下,温度越高,Nb与TiC的固溶程度越高。其中复合材料(Ti, Nb) C0.5的力学性能最优异,(Ti, Nb) C0.5复合材料在1600 ℃时达到最好硬度23.0 GPa,断裂韧性7.20 MPa·m1/2。
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关键词:
- TiC /
- Nb /
- (Ti Nb) Cx /
- 非化学计量比 /
- 性能
Abstract: In this paper, A variety of non-stoichiometric (Ti, Nb)Cx PCD tool binders were prepared by mechanical alloying (MA) of TiC and transition metal Nb. The phase composition of the sintered composite was detected by X-ray diffractometer (XRD), and the composite was treated and analyzed by jade software. The fracture morphology of the composites was observed by scanning electron microscope (SEM), and the hardness and fracture toughness of the composites were measured by Vickers hardness tester. The results show that in the range of 1300 ℃ to 1700 ℃, the higher the sintering temperature, the higher the degree of solid solution of TiC and Nb. Under the same sintering temperature, the hardness of (Ti, Nb)Cx composite gradually increases with the increase of metal Nb proportion. Under the same metal Nb proportion, the higher the temperature, the higher the degree of solid solution of Nb and TiC. Among them, the mechanical properties of composite material (Ti, Nb) C0.5 are the best, and the best hardness of (Ti, Nb) C0.5 composite material is 23.0 GPa and the fracture toughness is 7.20 MPa·m1/2 at 1600 ℃.-
Key words:
- TiC /
- Nb /
- (Ti Nb) Cx /
- Non-stoichiometric ratio /
- property
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