Sage Journals: Discover world-class research

Abstract

The polyborosilazane was prepared by coammonolysis of boron trichloride and methyldichlorosilane with hexamethyldisilazane. The decarburisation process of the polyborosilazane under ammonia was studied. The results suggested carbon was effectively removed under ammonia and the removal of carbon mainly occurred during the temperature range of 400–600°C. After pyrolysed at 900°C under ammonia, the carbon content was only 0·29 wt-%. Further heat treatment at 1500°C under argon yielded SiBN ceramic. The structure and morphological properties of SiBN ceramic were studied by solid ²⁹Si nuclear magnetic resonance, X-ray diffraction and scanning electron microscopy. The results showed that the SiBN ceramic was amorphous and possessed a smooth surface. The contents of boron, silicon and nitrogen in the SiBN ceramic are 10·9, 42·6 and 38·48 wt-% respectively.

Keywords

Polyborosilazane Decarburisation SiBN

Get full access to this article

View all access options for this article.

References

Johnson

, Evans

, Goettler

, Harmer

, Lipowitz

, Luthra

, Palmer

, Prewo

and Tressler

: ‘Ceramic fibers and coatings: advanced materials for the twenty-first century’; 1998, Washington, DC, National Academy Press.

Christin

: ‘Fabrication and applications of C/C, C/Si and SiC/SiC composite’, in ‘High temperature ceramic matrix composites’, (ed. R. N. W. Kreneletal), 729–743; 2001, Weinheim, Wiley-VCH Verlag GmbH & Co. KGaA.

Riedel

, Kienzle

, Dressler

, Ruswisch

, Bill

and Aldinger

: ‘A silicoboroncarbonitride ceramic stable to 2000°C’, Nature, 1996, 382, 796–798.

Bill

and Aldinger

: ‘Precursor-derived covalent ceramics’, Adv. Mater., 1995, 7, 775–787.

Baldus

and Jansen

: ‘Novel high performance ceramics – amorphous inorganic networks from molecular precursors’, Angew. Chem. Int. Ed., 1997, 36, 329–343.

Weinmann

, Schuhmacher

, Kummer

, Prinz

, Peng

, Seifer

, Christ

, ller

, Bill

and Aldinger

: ‘Synthesis and thermal behavior of novel Si–B–C–N ceramic precursors’, Chem. Mater., 2000, 12, 623–632.

Baldus

, Jansen

and Sporn

: ‘Ceramic fibers for matrix composites in high-temperature engine applications’, Science, 1999, 285, 699–703.

Jaschke

and Jansen

: ‘A new borazine-type single source precursor for Si/B/N/C ceramics’, J. Mater. Chem., 2006, 16, 2792–2799.

Vila

, Gonzalez

, Hernandez

and Moll

: ‘The role of C-impurities in alumina dielectrics’, J. Eur. Ceram. Soc. 2004, 24, 1513–1516.

10.

Bernard

, Weinmann

, Gerstel

, Miele

and Aldinger

: ‘Boron-modified polysilazane as a novel single-source precursor for SiBCN ceramic fibers: synthesis melt-sinning, curing and ceramic conversion’, J. Mater. Chem., 2005, 15, 289–299.

11.

Jansen

, Jaschke

and Jaschke

: ‘Amorphous multinary ceramics in the Si–B–N–C system’, Struct. Bond., 2002, 101, 137–191.

12.

Jansen

, Schon

and van Wullen

: ‘The route to the structure determination of amorphous solids: a case study of the ceramic Si(3)B(3)N(7)’, Angew. Chem. Int. Ed., 2006, 45, 4244–4263.

13.

Tang

, Wang

, Li

, Xie

, Wang

, Li

and Wang

:‘ Polymer-derived SiBN fiber for high-temperature structural/functional applications’, Chem. Eur. J., 2010, 16, 6458–6462.

14.

Brown

and Laubengayer

: ‘B-trichloroborazole’, J. Am. Chem. Soc., 1955, 77, 3699–3700.

15.

Weinmann

, Kamphowe

, Schuhmacher

, Muller

and Aldinger

: ‘Design of polymeric Si–B–C–N ceramic precursors for application in fiber-reinforced composite materials’, Chem. Mater., 2000, 12, 2112–2122.

16.

Jäschke

and Jansen

: ‘Synthesis, crystal structure, and spectroscopic characterization of the borazine derivatives [B{CH₂(SiCl₃)}NH]₃ and [B{CH₂(SiCl₂CH₃)}NH]₃’, Z. Anorg. Allg. Chem., 2004, 2004, 239–243.

17.

Peuckert

, Vaahs

and Bruck

: ‘Ceramics from organometallic polymers’, Adv. Mater., 1990, 2, 398–404.

18.

Narisawa

, Iseki

, Katase

and Okamura

: ‘Ceramization of reflux-treated polymethylsilane precursors to silicon carbide’, J. Am. Ceram. Soc., 2003, 86, 227–233.

19.

Lewis

and Maciel

: ‘Magnetic-resonance characterization of solid-state intermediates in the generation of ceramics by pyrolysis of hydridopolysilazane’, J. Mater. Sci., 1995, 30, 5020–5030.

Pyrolysis of polyborosilazane and its conversion into SiBN ceramic

Abstract

Keywords

Get full access to this article

References