造孔剂含量对SiC/Al复合材料抗弯强度的影响

Effect of pore-forming agents content on bending strength of SiC/Al composites

采用无压熔浸法制备SiC/Al复合材料,并利用颗粒堆积和毛细管力的静力学理论研究造孔剂含量对SiC/Al复合材料抗弯强度的影响。通过扫描电镜对试样的断口形貌进行分析,发现造孔剂含量为20%(质量分数)时,残余孔隙较小,而造孔剂含量为10%和15%时,残余孔隙较大。造孔剂含量对抗弯强度产生影响,随造孔剂含量增加,抗弯强度先增大后减小,造孔剂为20%时,抗弯强度出现最大值343.63 MPa。

The effects of the content of pore-forming agents on bending strength of SiC/Al composites produced by pressureless infiltration technique was investigated, and the fracture of SiC/Al composite was observed using SEM. It is found that the residual porosity of the SiC/Al composites was small when pore-forming agents content up to 20%, while it was larger when pore-forming agents from 10% to 15%; the bending strength varies with the pore-making agents content, when the pore-forming agent＇s content increases 20%, the bending strength of SiC/Al composites reaches its maximum value of 343.63 MPa.