(1. 北京礦冶研究總院 金屬材料所, 北京 100044；
2. 東北大學(xué) 材料與冶金學(xué)院， 沈陽 110004)
摘 要: 采用固態(tài)合成法制備SiCf/NiFe2O4復(fù)合材料， 研究SiCf添加量對密度、 氣孔率、 沖擊韌性、 熱震性等力學(xué)性能的影響。 結(jié)果表明, 添加SiCf可以顯著改善NiFe2O4尖晶石的力學(xué)性能， 含2%SiCf試樣的沖擊韌性比尖晶石提高約160%, 其增強機理為纖維的脫粘和拔出效應(yīng)； 經(jīng)一次熱震后強度保持率可提高至96%， SiCf添加量以2%為宜； 界面的結(jié)合狀態(tài)是影響材料性能最重要的因素。
關(guān)鍵字: SiCf/NiFe2O4復(fù)合材料； 力學(xué)性能； 顯微結(jié)構(gòu)； 界面
（1. Institute of Metal Materials, Beijing General Research Institute of Mining and Metallurgy, Beijing 100044, China;
2. School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China）
Abstract: The SiCf/NiFe2O4 composite was prepared by the solid-state reaction. The effect of addition of SiCf on the density, porosity, impact toughness and thermal shock resistance was studied. The results show that the mechanical properties of composite are improved considerably in comparison with that of the NiFe2O4 spinel. The impact toughness of specimen with 2%SiCf is raised about 160%, the prevalent toughening mechanism operating in composites is debonding and pullout of fibers. The strength retention of specimen with 2%SiCf is increased to 96% after thermal shock. The properties of specimen are appropriated when it contains 2%SiCf in comprehensive consideration. The fiber/matrix interface plays a critical role in the determination properties.
Key words: SiCf/NiFe2O4 composite; mechanical property; microstructure; interface
