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通过Ti-SiC反应体系,选择粒径为45μm的基体TC4,5μm的增强相SiC(质量分数为5%和10%),经过低能球磨混粉后,微波烧结原位合成颗粒增强钛基复合材料。采用X射线衍射仪(XRD)、扫描电镜(SEM)和能谱仪(EDS)对制备的钛基复合材料进行组织结构分析,并对钛基复合材料的致密度、显微硬度、压缩强度、抗拉强度、耐磨性和抗氧化性进行测试研究。结果表明,钛基复合材料主要由增强相TiC,Ti_5Si_3及基体Ti_3种物相组成。TiC呈颗粒状,有明显的棱角,而Ti_5Si_3呈熔融状颗粒,但是颗粒没有明显的棱角,增强相呈准连续网状分布,随着SiC含量的增加,网状结构不清晰,部分增强相团聚在一起。复合材料的相对密度、显微硬度和压缩强度随SiC含量的增加而增加,分别达到98.76%,HV729和2058MPa,但是复合材料的室温拉伸强度随SiC含量增加而降低。引入增强相后,复合材料的抗氧化性和耐磨性均高于基体,且耐磨性和抗氧化性随SiC含量增加而增加,其室温磨损机制主要为粘着磨损。
Through the Ti-SiC reaction system, the substrate TC4 with a size of 45μm and the reinforced phase SiC with the mass of 5μm and 5% (mass fraction 5%) were selected. After low-energy ball milling and powder mixing, the microstructure of the particle reinforced titanium matrix composites . The microstructure and mechanical properties of the prepared titanium matrix composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The microstructure, mechanical properties, Tensile strength, wear resistance and oxidation resistance were tested. The results show that the titanium matrix composites consist mainly of the phases TiC, Ti_5Si_3 and Ti_3. TiC is granular, with obvious edges, while Ti_5Si_3 is a molten particle, but the particles have no obvious edges and the reinforcing phase is in a quasi-continuous reticular distribution. As the SiC content increases, the network structure is unclear and the partially enhanced phase agglomeration Together The relative density, microhardness and compressive strength of the composites increased with the SiC content increasing, reaching 98.76%, HV729 and 2058MPa, respectively. However, the tensile strength at room temperature of the composites decreased with the increase of SiC content. The introduction of enhanced phase, the composite oxidation resistance and wear resistance are higher than the matrix, and wear resistance and oxidation resistance increases with increasing SiC content, the room temperature wear mechanism is mainly adhesive wear.