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Si_3N_4/1Cr18Ni9Ti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,Si_3N_4/1Cr18Ni9Ti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Si_3N_4/1Cr18Ni9Ti复合材料,具有更加优异的耐冲蚀性能。
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.
作者
杜奇
高勇
任志恒
曹小明
王超
张劲松
DU Qi;GAO Yong;REN Zhiheng;CAO Xiaoming;WANG Chao;ZHANG Jinsong(Institute of Metal Research,Chinese Academy of Science,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Liaoning ZhuoYi New Materials Corporation,Yingkou 115004,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2019年第1期34-42,共9页
Chinese Journal of Materials Research
基金
国家重点研发计划重点专项(2017YFB0310405)~~
