alsial2o3sic核壳结构颗粒的制备与性能表征word格式论文.docxVIP

粒子热导率的影响，同时对核壳粒子的抗热渗漏性进行了研究分析。结果表明 核壳粒子的热导率随 SiC 含量的增加而增加。宏观颗粒抗热渗漏性对比实验 结果表明，经包裹后的核壳颗粒具有明显的抗热渗漏性。关键词：Al-Si/Al2O3-SiC；核壳结构；储能控温；相变潜热；微封装AbstractPhase change materials has the function of storing energy and controlling temperature. Compared to other phase change materials, Al-Si alloy has the property of high density of energy storage, high thermal stability, small undercooling, high thermal conductivity, rich material sources, low manufacturing cost. It is a kind of promising phase change and energy storage materials. However, its high causticity and incompatibility are primary problems obstructing its application, when Al-Si alloy changes from solid phase to liquid at high temperatures. Therefore, it is very significant for the practical applications to achieve the effective encapsulation of Al-Si melt under high temperature conditions. Based on the micro-encapsulation technology of Al-Si/Al2O3 core-shell structure particles, SiC particles with high inertness and thermal conductivity were introduced into the Al2O3 shell in order to improve its thermal conductivity which is a useful method to improve the heat storage speed of Al-Si alloy so as to enhance the effect of energy storage.Some of experiments and analysis methods, such as Zeta potential measurement, transmission electron microscope(TEM), were adopted to research the dispersion and modification of SiC nano-meter powders in order to analyze the preparation mechanism of Al2O3-SiC composite shell. When SiC powders were dispersed by KH550, only a small amount of sol particles were adhered on there surface. After dispersed by sodium dodecyl benzene sulfonate (SDBS), however, SiC powders were wrapped by the alumina sol particles on the surface. The reason is that the surface of SiC powder dispersed by SDBS is negatively charged, which is benefit to attract positively charged Al2O3 sols to form Al–O–Si bonds. Thus, it is more effective to to graft compounds on the surface of SiC powders so as to synthesize the mo