【摘要】 用凝胶注模和压力铸造两步法制备具有双连续结构的Si₃N₄/1Cr18Ni9Ti复合材料并分析其物相组成、宏观和微观结构,研究了材料的冲蚀率与攻角、流速、含沙量以及时间的关系。结果表明,与1Cr18Ni9Ti材料相比,Si₃N₄/1Cr18Ni9Ti复合材料具有双连续结构,界面结合良好;其冲蚀率随着攻角变化的幅度小,冲蚀率与流速之间的关系由1Cr18Ni9Ti材料的线性关系转变为指数关系（E∝V0.67）,且随着时间的延长冲蚀率降低;冲蚀率与含沙量之间的关系仍呈线性。具有双连续结构的Si₃N₄/1Cr18Ni9Ti复合材料,具有更加优异的耐冲蚀性能。更多还原

【Abstract】 Composites with co-continuous structure of Si₃N₄/1Cr18Ni9 Ti were prepared via a twostep process, namely gel casting and pressure casting. The phase composition, macro-and micro-structure of the composites were characterized. The erosion rate in flow slurry composed of water and quartz sand, as a function of impingement angle, flow velocity, sand content and erosion time was assessed in comparison with the plain 1Cr18Ni9 Ti. Results show that Si₃N₄/1Cr18Ni9 Ti composites exhibited a perfect co-continuous phase structure with a good combination between Si₃N₄ and 1Cr18Ni9Ti; the fluctuation of erosion rate as a function of impingement angle of this composites is smaller than that of 1Cr18Ni9Ti; the erosion rate of composites has an exponent relationship with flow velocity（E∝V0.67）, while there is a linear relationship between the erosion rate and flow velocity for 1Cr18Ni9Ti; the erosion rate of this composites decreases gradually with the increasing erosion time and then stabilizes, while that of 1Cr18Ni9 Ti is hardly changed; There is a linear relationship between the erosion rate and sand content in the slurry for the two materials. The composite with co-continuous structure of Si₃N₄/1Cr18Ni9 Ti exhibits superior erosion resistance, in contrast with the plain 1Cr18Ni9 Ti steel.更多还原