Characterization of pyrolysed silacyclobutasilazane

Autor:	C. K. Saha, H. A. Freeman
Rok vydání:	1992
Předmět:	chemistry.chemical_classification Materials science Mechanical Engineering Polymer Microstructure Amorphous solid Crystal Amorphous carbon chemistry Chemical engineering Mechanics of Materials Organic chemistry General Materials Science Graphite Pyrolytic carbon Pyrolysis
Zdroj:	Journal of Materials Science. 27:4651-4656
ISSN:	1573-4803 0022-2461
DOI:	10.1007/bf01166001
Popis:	Silacyclobutasilazane (SCBZ) is a candidate organosilicon polymer suited to many hightemperature applications. Pyrolysis of SCBZ occurs over two distinct temperature ranges 400–800 and 1400–1800 °C. X-ray diffraction analysis showed that amorphous SCBZ transforms to crystalline SiC above 1400 °C. Thin foils of the pyrolysed (1800 °C) SCBZ were prepared and examined using the analytical electron microscope. The material was found to contain ∼ 200 nmβ-SiC particles scattered through a matrix consisting of ∼ 50 nm radiating clusters of pyrolytic graphite crystals and a highly carbonaceous amorphous background. It is suggested that during 1400–1800 °C pyrolysis two major reactions occurred. Initially, SCBZ through nitrogen loss, decomposed to crystalline SiC and amorphous carbon. Subsequent graphitization then produced the radiating crystal clusters.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d14d1c83078e54e91614173d24f79db4 https://doi.org/10.1007/bf01166001 Zobrazit plný text záznamu Full text from SpringerLink