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采用粉末冶金工艺制备了Fe-2.0Cr-2.0Mo-0.3C-35TiC钢结硬质合金。在1425～1455℃范围内研究了不同碳气氛对合金密度和抗弯强度的影响。不同碳气氛采用不同装舟方式来控制,即样品掩埋入TiC填料方式、样品曝露于Al2O3+4%C填料之上、样品与Al2O3+4%C之下铺一层碳黑并曝露方式。通过OM、SEM观察了合金的微观组织形貌;通过EDX手段分析了合金中各相的组成成分;测量了合金的密度和抗弯强度。结果表明,采用样品与Al2O3+4%C之下铺一层碳黑并曝露方式能够提供充足的碳气氛,改善液态Fe与TiC微粒的润湿性,1435℃下烧结1h所得的试样具有理想的致密度和抗弯强度,其密度达6.51g.cm-3,抗弯强度达1659MPa,比目前国内生产的相近成分的合金抗弯强度提高了约22%。
Fe-2.0Cr-2.0Mo-0.3C-35TiC steel-bonded cemented carbide was prepared by powder metallurgy. In the range of 1425 ~ 1455 ℃, the effects of different carbon atmospheres on the density and flexural strength of the alloy were studied. The different carbon atmospheres were controlled by different ways of loading the boats, ie, the samples were buried into the TiC packing. The samples were exposed on the Al2O3 + 4% C filler. The samples were exposed to a layer of carbon black under Al2O3 + 4% C. The microstructure of the alloy was observed by OM and SEM. The composition of each phase in the alloy was analyzed by EDX. The density and flexural strength of the alloy were measured. The results show that the sample can be exposed to a layer of carbon black under Al2O3 + 4% C to provide sufficient carbon atmosphere to improve the wettability of the liquid Fe and TiC particles. The sample sintered at 1435 ° C for 1 h has the ideal The density and flexural strength, the density of 6.51g.cm-3, flexural strength of 1659MPa, similar to the current domestic production of similar components of the alloy flexural strength increased by about 22%.