Optimizing Electrical and Mechanical Properties of Reaction-Sintered SiC by using Different-Sized SiC Particles in Preform

Abstract

A series of reaction-sintered SiC was fabricated from preforms with varying volume fractions of two resin-coated SiC particles of different sizes (63 and 18 µm). The electrical resistivity and mechanical strength were eventually optimized at the small particle volume fraction of 0.3~0.4, at which point the porosity of the preform was minimized. This study experimentally proves that additional processes after the formation of the preform, such as silicon infiltration and reaction sintering, do not apparently alter the optimum volume fraction of the preform packing, predicted by an existing analytical model based on solid packing. Thus, the volume fraction of particles of different sizes can be determined practically through the solid packing model to fabricate RSSCs with optimal properties.

Electrical Resistivity and NTC/PTC Transition Point of a Nitrogen-Doped SiC Igniter, and Their Correlation to Electrical Heating Properties

“…Recently, the current research group reported that residual silicon can be eliminated by a post process such as evaporation at temperatures higher than those of the reaction sintering. 9,10) For the initial fast rising of temperature by joule heating of a SiC igniter, a decreased electrical resistivity is highly important. In this regard, nitrogen doping can be a good approach.…”