材料,通过密度和增重率的测定及DSC,SEM和XRD分析,探讨烧结过程中导致合金粉性质发生变化的原因,研究合金粉粒径对材料蓄热性能的影响规律。结果表明:烧结过程中,合金粉中Al被氧化并与基体中SiO_2发生反应,破坏了部分合金粉的原有性能,导致
High temperature form-stable composite phase change materials were prepared by mixed sintering method with Al-Si eutectic alloy powder as phase change medium and fly ash as matrix material.The density,weight gain rate,DSC,SEM and XRD were measured and characterized to study the effect of particle size of phase change media on material properties.The reason for the properties change of the alloy during sintering was discussed.The results show that during the sintering process,Al in the alloy powder is oxidized and reacts with SiO_2 in the matrix,which destroys the original properties of the alloy powder and results in the decrease of latent heat of phase change.The smaller the particle size of the alloy powder,the greater the degree of oxidation and reaction with the matrix,leading to more compact compound but lower latent heat of phase change.On the contrary,larger particle size of the alloy powder contributes to higher latent heat but lower density.Therefore,The appropriate balance between latent heat and density can be achieved by adjusting the content of large particle size(40μm
引文
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