Formation of Nano-scale Coating on Micro-scale Substrate by EPD Method

Abstract

Ceramic-based fiber reinforced composites based on silicon carbide (SiC) and alumina (Al₂O₃) have been expected to be applied in the aerospace, environment and energy fields as next-generation highly reliable heat-resistant materials. The fiber/matrix interface in ceramic-based fiber reinforced composites plays an important role to develop excellent mechanical properties, and it is important to form optimal interface layers in the composites and to control the interface. The aim of this study is to develop the novel formation process of nano-scale coating layer (interfacial layer) with the thickness of several tens to several hundreds of nanometers on the surface of ceramic fibers (micro-scale substrate) by electrophoretic deposition (EPD) method, and the formation process of carbon coating layer and hexagonal boron nitride coating layer on the conductive and low-conductive SiC fibers by EPD was studied.

Graphical Abstract

SEM micrographs of the surface of (a) as-received SiC fiber and carbon-coated SiC fiber by EPD using (b) 0.1 wt%, (c) 0.2 wt% and (c) 0.3 wt% colloidal graphite suspension.