Silicone Resin Applications for Ceramic Precursors and Composites

Abstract

This article reviews the applications of silicone resins as ceramic precursors. The historical background of silicone synthesis chemistry is introduced to explain the production costs and supply availability of various silicones. Thermal degradation processes of silicones are classified in terms of the main chain structure and cyclic oligomer expulsion process, which determine the resulting ceramic yield and the chemical composition. The high temperature decomposition of Si-O-C beyond 1,400 °C in an inert atmosphere and formation of a protective silica layer on material surfaces beyond 1,200 °C in an oxidative atmosphere are discussed from the viewpoints of the wide chemical composition of the Si-O-C materials. Applications of the resins for binding agents, as starting materials for porous ceramics, matrix sources with impregnation, fiber spinning and ceramic adhesions are introduced. The recent development of the process of filler or cross-linking agent additions to resin compounds is also introduced. Such resin compounds are useful for obtaining thick coatings, MEMS parts and bulk ceramics, which are difficult to obtain by pyrolysis of simple organometallic precursors without additives.

Processing of polysiloxane-derived porous ceramics: a review

“…Because silicone resins can accept various kinds of fillers, plasticizers, blowing agents and cross-linking agents, a proper control over cell size, cell density and cell connectivity is fundamentally possible by employing simple plastic-foaming methods [34]. Excellent dimensional stability after the pyrolysis of the polysiloxane-derived porous ceramics is associated with the thermosetting nature and high ceramic yield of silicones.…”

“…The cross-linked elastomers can accept relatively high extension without cracks when compared to other polycarbosilane, polysilazane and polysilanes. This particular property is useful to shape the starting materials into desired forms by molding, casting, injection, impregnation or extrusion [34]. The advantages of using polysiloxane precursor for porous ceramics include easy storage and processing, the highest ceramic yield [37], low processing temperature (1000-1200…”

“…Polysiloxanes are generally denoted as silicones and are superior in heat and chemical resistance when compared to many other polymers. Thus, silicones are widely used as sealants, electric insulator coatings, surface treatments for glass materials, heat resistant oils and chemically stable elastomers [10,34]. The general synthesis method for the preparation of polysiloxanes comprises the reaction of chloro (organo) silanes with water [10].…”

“…• C, respectively [34][35][36]. The cross-linked elastomers can accept relatively high extension without cracks when compared to other polycarbosilane, polysilazane and polysilanes.…”

A novel method for joining aluminum foil and alumina by polysiloxane coating

“…The peaks at 36, 40, 50, and 54°s uggest the existence of aluminum silicate. Some papers have reported that siloxanes can easily form glass or nanocrystalline aluminum silicate after heating, 14)16) so the presence of aluminum silicate was reasonable. In addition, there were many tiny peaks in the pattern, which may indicate the presence of polycrystalline aluminum silicate phases.…”