针对新一代耐高温、抗辐照、抗氧化、高强韧热结构材料的应用需求,通过三维干法球磨,冷等静压制坯,高温氩气气氛烧结制备不同ZrC-AlN含量的Mo基复合材料。采用扫描电子显微镜、X射线衍射仪和同步热分析仪等,研究陶瓷含量对复合粉末分散性以及复合材料微观结构、氧化行为和性能的影响。结果表明：通过三维干法球磨可获得均匀分散的金属陶瓷复合粉末。从室温到1 200 ℃氧化后,随陶瓷相含量增加,复合材料的质量损失率大幅降低,抗氧化陶瓷相的引入改善了复合材料的抗氧化性能。陶瓷相引入后,复合材料的抗压强度大幅升高,最高达1 315.8 MPa,相比纯Mo提高约一倍,这是因为硬度高、模量大、不易压缩的陶瓷相增强了复合材料的抗压性能。然而,闭孔、界面反应、各物相自身力学性能的综合作用使复合材料抗弯强度降低。
In order to meet the application needs of a new generation thermal structure materials of high temperature resistance, anti-radiation, oxidation resistance, and high strength and toughness, Mo-based composites with different ZrC-AlN contents were prepared by three-dimensional dry ball milling, cold isostatic pressing, and high-temperature argon atmosphere sintering. The influences of ceramic content on the dispersion of composite powders, as well as the microstructures, oxidation behavior, and properties of composites, were studied using scanning electron microscope, X-ray diffractometer, and simultaneous thermal analyzer. The results indicate that uniformly dispersed metal ceramic composite powders can be obtained through three-dimensional dry ball milling. After oxidation from room temperature to 1 200 ℃, the mass loss rate of the composites decreases greatly with the increase of ceramic phase content, indicating the improved oxidation resistance of composites by introducing antioxidant ceramic phases. When introducing ceramic phase, the compressive strength of the composites increase greatly with the maximum of 1 315.8 MPa, increasing by about one time compared to pure Mo, it’s because the ceramic phases with high hardness, high modulus, and low compressibility which enhance the compressive property of the composites. However, the bending strength of composites decrease, which is a comprehensive result of closed pores, interface reactions, and the mechanical properties of each phase itself.
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