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Novel Polysilazanes as Precursors for Silicon Nitride/silicon Carbide Composites Without “Free” Carbon by Markus Hörz; Achim Zern; Frank Berger; Jörg Haug; Klaus Müller; Fritz Aldinger; Markus Weinmann is a Materials Science article available to read on EtoBox.
What is Novel Polysilazanes as Precursors for Silicon Nitride/silicon Carbide Composites Without “Free” Carbon about?
Polysilazanes with chemical composition Si 4 N 4 CH x (x = 12-14) were obtained on two different reaction pathways. In the first route three equivalents of dichlorosilane, H 2 SiCl 2 , were mixed with one equivalent of methyldichlorosilane, H 3 CSiHCl 2 , and reacted with ammonia to yield [(SiH 2 -NH) 3 (H 3 CSiH-NH)] n (1) after appropriate work-up. In the second route, dichlorosilane was reacted with methylamine and ammonia in a 3:1 ratio to deliver [(SiH 2 -NH) 3 (SiH 2 -NCH 3 )] n (2). The raw products were further cross-linked by base-catalyzed dehydrocoupling reactions involving Si H and N H units to yield products 1a and 2a, respectively. The molecular structure of 1 and 2 was investigated by means of high resolution 1 H, 13 C{ 1 H}, and 29 Si{ 1 H} NMR spectroscopy in C 6 D 6 solution as well as by IR spectroscopy. Because of the insolubility of the cross-linked products 1a and 2a solid state 1 H, 13 C, and 29 Si CP-MAS NMR in combination with IR spectroscopy were applied for their spectroscopic characterization. Chemical compositions were determined using elemental analysis. Thermolysis in an argon atmosphere up to 1400 • C of the cross-linked products delivered Si 3 N 4 /
Who reads Novel Polysilazanes as Precursors for Silicon Nitride/silicon Carbide Composites Without “Free” Carbon?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Markus Hörz; Achim Zern; Frank Berger; Jörg Haug; Klaus Müller; Fritz Aldinger; Markus Weinmann
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)
- Published
- 2005
- Language
- EN
- Field
- Materials Science (Physical Sciences)