Sintering Behavior of Spark Plasma Sintered SiC with Si-SiC Composite Nanoparticles Prepared by Thermal DC Plasma Process

Abstract

The Si-coated SiC (Si-SiC) composite nanoparticle was prepared by non-transferred arc thermal plasma processing of solid-state synthesized SiC powder and was used as a sintering additive for SiC ceramic formation. Sintered SiC pellet was prepared by spark plasma sintering (SPS) process, and the effect of nano-sized Si-SiC composite particles on the sintering behavior of micron-sized SiC powder was investigated. The mixing ratio of Si-SiC composite nanoparticle to micron-sized SiC was optimized to 10 wt%. Vicker’s hardness and relative density was increased with increasing sintering temperature and holding time. The relative density and Vicker’s hardness was further increased by reaction bonding using additional activated carbon to the mixture of micron-sized SiC and nano-sized Si-SiC. The maximum relative density (97.1%) and Vicker’s hardness (31.4 GPa) were recorded at 1800 °C sintering temperature for 1 min holding time, when 0.2 wt% additional activated carbon was added to the mixture of SiC/Si-SiC.

Improving the Through-Thickness Thermal Conductivity of Carbon Fiber/Epoxy Laminates by Direct Growth of SiC/Graphene Heterostructures on Carbon Fibers

“…By controlling the deposition conditions, we manipulate the synthesized 3D hybrid architectures and tune their thermal transport performance. Generally, SiC crystals exhibit high thermal conductivity (∼490 W/mK) and hence are used as thermal conductivity fillers . As mentioned previously, much effort has been dedicated over the last few years to enhancing the thermal performance of CFRPs via modification of the epoxy matrices utilizing mixtures of graphene/graphitic nanoplatelets and SiC crystals at different weight fractions.…”

“…Generally, SiC crystals exhibit high thermal conductivity (∼490 W/mK) and hence are used as thermal conductivity fillers. 30 As mentioned previously, much effort has been dedicated over the last few years to enhancing the thermal performance of CFRPs via modification of the epoxy matrices utilizing mixtures of graphene/graphitic nanoplatelets and SiC crystals at different weight fractions. However, to date, there is no related research work reporting the direct growth of a graphene/SiC heterostructure on CF in the literature with a view to enhancing the thermal conductivity in the through-thickness direction in laminates.…”

High rate synthesis of graphene-encapsulated silicon nanoparticles using pulse-modulated induction thermal plasmas with intermittent feedstock feeding

“…[16][17][18][19][20][21][22][23][24] Such the ICTP method has also actively been tested for synthesizing Si-based nanomaterials for anode material in LIB, including carbon-coated Si nanoparticles, Si/C nanocomposites, etc. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] On the other hand, we have developed a novel technique of the PMITP+TCFF method for high rate production of nanoparticles. [41][42][43][44][45][46][47][48] The pulse-modulated induction thermal plasma (PMITP) is the PMITP, which is sustained by amplitude-modulated coil current.…”