Journal ArticleDOI
Correlation of boron content and high temperature stability in Si–B–C–N ceramics II
TLDR
In this article, the preparation of polyborosilazanes which are obtained by hydroboration of oligovinylsilazane [−(H 2 CCH)SiHNH−] n with different amounts of H 3 B. SMe 2.Abstract:
This study treats the preparation of polyborosilazanes which are obtained by hydroboration of oligovinylsilazane [–(H 2 CCH)SiHNH–] n with different amounts of H 3 B . SMe 2 . Pyrolysis of these precursors yields amorphous ceramic materials, which only differ in their relative boron content whereas their Si/C/N ratio is very similar. High temperature thermogravimetric analysis reveals that with increasing boron content the material's thermal degradation is shifted toward higher temperatures. Furthermore, the observed mass loss due to nitrogen evaporation during the material's decomposition is noticeably smaller in boron-rich materials than thermodynamically calculated. X-ray diffraction (XRD) experiments support the presence of crystalline silicon nitride in heat treated samples with a minimum boron content of 5 at.%. The decomposition temperature of this phase strongly depends on the amount of boron and can exceed 2000°C. However, high temperature stable materials are not only characterized by a definite B/N ratio, but also by the ability to develop appropriate microstructures.read more
Citations
More filters
Journal ArticleDOI
Soluble and Meltable Hyperbranched Polyborosilazanes toward High-Temperature Stable SiBCN Ceramics
TL;DR: These hyperbranched polyborosilazanes with soluble and meltable characteristics provide a new perspective for the design of preceramic polymers possessing advantages for high-temperature stable polymer-derived ceramics with complex structures/shapes.
Journal ArticleDOI
Polymer Derived Si–B–C–N Ceramics: 30 Years of Research
Antoine Viard,Diane Fonblanc,David Lopez-Ferber,Marion Schmidt,Abhijeet Lale,Charlotte Durif,Maxime Balestrat,Fabrice Rossignol,Markus Weinmann,Ralf Riedel,Samuel Bernard +10 more
TL;DR: In this article, the authors present an overview of the works related to the development of Si-B-C-N ceramics through the PDC route in the last 30 years.
Journal ArticleDOI
Precursor derived Si-B-C-N Ceramics: oxidation kinetics
TL;DR: In this paper, the scale growth of precursor-derived ceramics was investigated at 1300° and 1500°C, and it was shown that at least within the experimental times these precursors develop extremely thin scales, thinner than pure SiC or Si3N4.39N2.28 (T2/1p).
Journal ArticleDOI
Processing route dramatically influencing the nanostructure of carbon-rich SiCN and SiBCN polymer-derived ceramics. Part I: Low temperature thermal transformation
TL;DR: In this paper, the significant effect of the processing route on the nanostructure evaluation of carbon-rich SiCN and SiBCN polymer-derived ceramics is reported.
Journal ArticleDOI
Processing and properties of C/Si-B-C-N fiber-reinforced ceramic matrix composites prepared by precursor impregnation and pyrolysis
TL;DR: In this article, the fabrication of C/Si-B-C-N fiber reinforced ceramic matrix composites (FRCs) is reported, which consists of three individual steps: (i) vacuum-assisted infiltration of a liquid two-component Si−B−C−N precursor into stacked woven carbon fiber fabrics, (ii) stepwise thermal cross-linking and (iii) thermal transformation of the polymer matrix composite into a ceramic matrix composite.
References
More filters
Book
The manipulation of air-sensitive compounds
TL;DR: Inert Gases and Their Purification as discussed by the authors, inert gases and their purification are used for line design and operation of vacuum line equipment and their operation is described in detail.
Journal ArticleDOI
A silicoboron carbonitride ceramic stable to 2,000°C
Ralf Riedel,Andreas Kienzle,Andreas Kienzle,Wolfgang Dressler,Lutz Ruwisch,Joachim Bill,Fritz Aldinger +6 more
TL;DR: In this paper, a boron-containing silicon nitride/carbide ceramic that does not degrade at temperatures up to 2,000 °C even in nitrogen-free environments is presented.
Journal ArticleDOI
Precursor‐derived Covalent Ceramics*
Joachim Bill,Fritz Aldinger +1 more
TL;DR: In this paper, the authors review some recent developments in the field of pyrolysis of preceramic compounds and demonstrate how several different fields of research like organoelement chemistry material processing and charcaterization can be combined for the development of novel advanced materials.
Journal ArticleDOI
Amorphous Silicoboron Carbonitride Ceramic with Very High Viscosity at Temperatures above 1500°C
TL;DR: In this paper, the viscosity of silicoboron carbonitride (Si2B1.0C3.4N2.3), which seems to have a Tg value of >1700°C, was examined.
Journal ArticleDOI