Fractal Characters and Thermal Conductive Properties of Self-assembled Material Texture of Silicon Nitride/Stainless Steel (SUS316L) Composites

Abstract

The dispersion of self-assembled β-Si 3 N 4 (SN) agglomerates in stainless steel (SUS316L) was decided with the multifractal analysis to investigate characters of the aggregated morphology of the average secondary particle area of SN particles. The thermal conductivity (λ e) of SN/SUS316L with the average particle diameter of SUS316L powder of 3 μm was higher than that expected from Kanenari model because SN agglomerations were formed. On the other hand, λ e of SN/SUS316L with the average particle diameter of SUS316L powder of 8 μm was lower than that expected from Kanenari model. On the multifractal analysis, the results showed that the capacity dimension (D 0) was not changed with adding SN particles. It suggested that the SN agglomerations were formed with similarity. λ e was increased with increasing the average secondary particle area of SN particles. D 0 was not increased with increasing λ e. It indicated that the forming the network of the thermal conductive particles played an important role in improving λ e. KEY WORDS β-Si 3 N 4 /SUS316L composite material, multifractal analysis, self-assembly, aggregated morphology, thermal conductivity

Self-assembly process under a solid-state reaction of β-Si3N4/austenitic stainless-steel composites: stirring conditions and material texture

“…Recently, we reported that the construction of a material texture through a self-assembly process in a composite material, manufactured by combining SUS316L and SN, was effective in improving the thermal conductivity. 7 Therefore, a self-assembly process involving solids is important for improving the composite material properties. However, there are few examples of improving the material properties through self-assembly in a solid-state reaction system.…”