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采用原位反应法制备了Cr2AlC-Fe基复合材料,通过热分析、X射线衍射、扫描电子显微镜和三点弯曲实验研究了原位反应的烧结工艺对产物物相、显微结构和性能的影响。结果表明:通过高温原位反应,原料中碳化铝铬发生了分解,所生成的碳铬化合物在Fe晶界形成了网络状陶瓷增强结构,所制备的复合材料在室温下具有较好的强度和韧性。但随着碳化铝铬含量的增加,复合材料的强度与断裂韧性之间呈负相关关系。当原料中碳化铝铬的含量为50%,烧结温度为1300℃,在30MPa压力下保温30min时,复合材料的抗弯强度达1417.05MPa,但断裂韧性只有18MPa m1/2。
Cr2AlC-Fe-based composites were prepared by in situ reaction. The effects of in-situ reaction sintering process on the phase, microstructure and properties of the products were investigated by means of thermal analysis, X-ray diffraction, scanning electron microscopy and three- . The results show that aluminum chromium carbide is decomposed in situ by high temperature in situ reaction, and the resulting carbon-chromium compound forms a network-like ceramic reinforced structure at the grain boundary of Fe. The prepared composite has good strength at room temperature and toughness. However, with the increase of aluminum carbide content, the strength and the fracture toughness of the composites have a negative correlation. When the content of aluminum carbide in the raw material is 50%, the sintering temperature is 1300 ℃, and the temperature is 30min, the flexural strength of the composites reaches 1417.05MPa, but the fracture toughness is only 18MPa m1 / 2.