Abstract
In the past twenty years, Si-B-C-N ceramic has attracted wide attention due to its special structure and outstanding properties. The ceramic generally has an amorphous or a nano-crystalline structure, and has excellent structural stability, oxidation resistance, creep resistance and high-temperature mechanical properties, etc. Thus, Si-B-C-N ceramic attracts many researchers and finds potential applications in transportation, aerocraft, energy, information, microelectronics and environment, etc. Much work has been carried out on its raw materials, preparation processes, structural evolution, phase equilibrium and high-temperature properties. In recent years, many researchers focus on its new preparation methods, the preparation of dense ceramic sample with large dimensions, ceramic matrix composites reinforced by carbon fiber or SiC whisker, or components with various applications. Research on Si-B-C-N ceramic will develop our insight into the relationship between structures and properties of ceramics, and will be helpful to the development of novel high-performance ceramics. This paper reviews the preparation processes, general microstructures, mechanical, chemical, electrical and optical properties, and potential applications of Si-B-C-N ceramic, as well as its matrix composites.
Highlights
Introduction to SiB-C-N ceramicSi-B-C-N ceramic is originally prepared by the organic polymer pyrolyzing route [1,2]
Pyrolysis of this precursor at 1000 °C in the argon atmosphere produces a kind of Si-B-C-N ceramic, whose structure is amorphous at temperatures lower than 1700 °C in air and does not lose weight even at 2000 °C in an inert atmosphere
Most of the Si-B-C-N ceramics have a common structural character, that is, no matter the as-pyrolyzed bulk ceramic or ceramic fiber prepared by the organic polymer pyrolyzing route, the as-deposited ceramic film prepared by reactive magnetron sputtering, or the as-milled ceramic powder fabricated by mechanical alloying, they all have amorphous structures [17,41,42]
Summary
Si-B-C-N ceramic is originally prepared by the organic polymer pyrolyzing route [1,2]. In 1992, Baldus et al employed the aminolysis and polycondensation reactions between tri(chlorosilylamino)borane and methylamine to synthesize poly(boro)silazanes [1] Pyrolysis of this polymer precursor in an inert atmosphere produces a SiBN3C ceramic, whose structure is still amorphous even at 1900 °C in the nitrogen atmosphere. In 1996, Riedel et al prepared a kind of white poly(boro)silazanes powder, using hydroboration, aminolysis and polycondensation reactions between methylvinylchlorosilane and borane [15] Pyrolysis of this precursor at 1000 °C in the argon atmosphere produces a kind of Si-B-C-N ceramic, whose structure is amorphous at temperatures lower than 1700 °C in air and does not lose weight even at 2000 °C in an inert atmosphere. Status of Si-B-C-N ceramic, including its main preparation processes, general microstructures, properties and potential applications, as well as those of its matrix composites
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