SiC_p/Al复合材料的孔隙度测定

通过对理论计算、腐蚀称重、碳含量测定等方法的比较，研究了ＳｉＣｐ／Ａｌ复合材料孔隙度的测定方法。结果表明，采用理论计算法来表征复合材料的孔隙度很不准确，腐蚀称重法虽然精确但比较繁琐，碳含量测定存在较大的误差。提出了一种新的方法—车屑法，并用此方法研究了复合材料搅拌时间和孔隙度的关系，表明孔隙度随搅拌时间的上升而增加。

MEASUREMENT OF POROSITY IN SiC p/Al COMPOSITES

The porosity of SiC p/Al MMCs was quantitatively investigated by means of theoretic calculation, chemical dissolution and carbon content measuring methods. It was found that theoretic calculation method will bring errors in some cases, chemical dissolution method is the most accurate but overelaborate, carbon content measuring method also brings about big errors; thus the cuttings method, whose essential lies in fact of that the specimen was cut into small cuttings of porous free and then measured its density after degreasing and drying, was established and used to study the relationship of porosity with stirring time in stirring casting process. The results indicate that the porosity increases with the increase of stirring time, and the cuttings method can be used to measure the porosity of SiC p/Al MMCs in stead the traditional methods.