纳米颗粒对Sn-Bi-Zn储热合金显微组织及热物理性能的影响OA

Specific heat capacity plays a crucial role in the heat transfer efficiency of materials.This study focuses on exploring the effects of second-phase nano samarium oxide,nano tungsten carbide,and nano nickel particles with densities similar to that of the alloy matrix on the microstructure and thermophysical properties of the alloy matrix.The phase composition and microstructure of the alloy were characterized using methods such as X-ray diffraction phase analysis,electron probe microanalysis,and X-ray fluorescence spectroscopy.The thermal and physical properties of the alloy were comprehensively analyzed using differential scanning calorimetry and laser flash analysis.The results indicate that the addition of second-phase nanoparticles changes the morphology of the eutectic phase and induces the formation of ultrafine grains in the composite alloy,altering the contribution ratio of electron and phonon heat transfer in the alloy.In the liquid state,an ordered structure is formed between the second-phase solid nanoparticles and the molten metal.As the temperature increases,breaking these ordered structures requires additional heat absorption,which increases the specific heat capacity.