Abstract：For aluminum matrix composites that are difficult to distinguish between reinforcements and matrix structures by metallographic microscope, it is difficult to accurately measure the volume fraction of reinforcements in aluminum matrix composites by national standard method (GB/T 32496—2016). Dissolution method was applied to the determination of volume fraction of SiC reinforcement in aluminum matrix composites. The aluminum matrix was firstly digested with HCl (1+1), HF and H2O2. Then SiC reinforcement was collected by glass filter crucible and quantitative filter paper, respectively. The corrosion behavior of the dissolving solution on SiC reinforcement was investigated. The results showed that aluminum matrix could be completely dissolved by adding 10-20mL HCl (1+1), 3-5mL HF and 3-6mL H2O2 sequentially. The precision results showed that the relative standard deviation (RSD) were not more than 0.1% (n=9), which could satisfy the determination demand of SiC volume fraction in aluminum matrix composites. The result of filter paper method was more economical and stable than that of glass filter crucible suction method. The filter paper method was recommended to determine SiC volume fraction in aluminum matrix composites. The analytical values of the aluminum matrix composite sample analyzed by filter paper method were in agreement with the theoretical values.
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