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: The nanocrystalline β-SiC powder was successfully synthesized by ball milling the Si-50%C elemental powder. During ball milling, a solid solution of C in Si, Si(C), firstly forms, followed by SiC... time increasing. After 40 h milling, there exists only β-SiC in the milled powder. The grain size of β-SiC is about 6.4 nm after the powder is milled for 60 h. After the 60 h-milled Si-50%C elemental......
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文章编号:1004-0609(2007)11-1833-05 近净成形制备SiC/Al复合材料Ⅰ:SiC预成形坯的制备 刘君武,郑治祥,吴玉程,王建民,汤文明,吕 君,徐光青 (合肥工业大学 材料学院,合肥 230009) 摘 要:以微米级的碳化硅粉和石墨粉为原料,采用氧化结合法制备出不同孔隙含量的,适合液态铝无压渗透的SiC预成形坯.研究SiC多孔陶瓷的低温烧结机理和石墨添加量对SiC陶瓷骨架烧结密度和尺寸变化的影响.结果表明:在1 100 ℃烧结时,碳化硅和石墨粉同时发生氧化反应;SiC氧化产生的结晶态SiO2膜将SiC粉体粘结成陶瓷骨架,石墨氧化去除后形成孔隙;SiC粉体间本征孔隙和石墨去除后留下的孔隙构成三维互连通状态;因SiC氧化导致陶瓷骨架产生4%左右的线膨胀,但坯体不发生形状改变;通过调整石墨含量,能获得孔隙率从0.47~0.63的SiC陶瓷......
Numerical Analysis of Powder Properties in Low Power Plasma Torch AN Lian-tong1,GAO Yang1,Yan Zhi-jun1,HEI Zhu-kun1 (1.Marine Engineering Collage, Dalian Maritime University, Dalian Liaoning 116026, China) 摘要:A mathematical model was presented to describe the particle trajectory, velocity and temperature properties in the low power plasma spraying torch (3.6 kW)in which powder particles were......
J. Cent. South Univ. (2017) 24: 1934-1940 DOI: https://doi.org/10.1007/s11771-017-3601-y Corrosion behavior of SiC foam ceramic reinforced Al-23Si composites in NaCl solution ZHU Jian-bin(诸建彬)1, 2... Institute of Technology, Nanchang 330099, China Central South University Press and Springer-Verlag GmbH Germany 2017 Abstract: SiC foam ceramic reinforced aluminum matrix composites (SFCAMCs) were......
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KINETIC MODEL FOR POWDER INJECTION DESULFURIZATION S.R. Yu1,X.G. Bi1,Y. Jin1 (1.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China) Abstract:The kinetic model for desulfurization using CaO-based powder injection has been proposed,which accords with the actual process of the experiment......