【摘要】 采用SiC收尘粉和石油焦为原料,粉体经提纯和表面改性后,凝胶注模成型(Gelcasting,GC)制备坯体,在真空炉中1600℃液相渗硅2h制备反应烧结SiC(Reaction bonded silicon carbide,RBSC)陶瓷。Zeta电位值和流变曲线显示,酸洗和粉体改性有效改善了SiC粉的分散性能。浆料粘度随石油焦添加量的增加上升。添加16~18wt%的石油焦,浆料的浓度为50vol%时,粘度介于600~900 mPa.s,满足凝胶注模成型的要求。素坯碳密度(c)可控制在0.81~0.84g/cm3之间,RBSC的密度和三点抗弯强度分别为3.07~3.10g/cm3和425~653MPa,而且材料的显微结构均匀。实现了以SiC收尘粉和石油焦为原料GC成型制备高性能RBSC材料的目标。更多还原

【Abstract】 SiC dust-collecting powders and petroleum coke were used as raw materials to prepare reaction bonded silicon carbide(RBSC) after refinement and surface modification treatment.The green body of RBSC was obtained using a gelcasting method,the RBSC ceramics were sintered through infiltration of liquid silicon at 1600°C in a vacuum furnace for 2 hours.The analysis results of the Zeta value and rheological properties of powdered SiC suspensions indicated that the dispersibility of the SiC powers was improved after refinement and surface modification treatment.The viscosity of the suspensions increased with the content of petroleum coke in the suspensions increasing.Adding 16~18wt% petroleum coke,a viscosity of 600~900mPa·s could be obtained,the carbide density of the green body prepared could be controlled between 0.81~0.84g/cm3.The density and flexural strength of the obtained RBSC were 3.05~3.10 g/cm3 and 425~653MPa,respectively,and the RBSC had a uniform microstructure.A high-performance RBSC was successfully fabricated using SiC dust-collecting powder and petroleum coke by gelcasting and reaction sintering techniques.更多还原