ChemInform Abstract: WACHSTUM VON ALPHA‐AL2O3‐WHISKERN BEI DER OX. VON ALUMINIUM

Gribkov, V. N.; Isaikin, A. S.; Umantsev, É. L.; Shchetanov, B. V.

doi:10.1002/chin.197243008

Cited by 3 publications

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“…Compared to polymer-based fibres, they exhibit extremely high mechanical properties and structural stability. Furthermore they can be obtained by simple routes and from inexpensive raw materials [6][7][8]. However, disadvantages of the use of whiskers are their toxicity and the difficulty in incorporating them into matrices.…”

Section: Introductionmentioning

confidence: 99%

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Chollon

Vogt

Berroth

1998

Journal of Materials Science

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Si-N-(0) fibres were grown according to a high temperature vapour-solid process involving the reaction between SiO and NH3 on a substrate. The oxygen concentration of the fibres is related to the partial pressures of SiO and NH 3 during fibre growth, depending respectively, on the processing temperature and the ammonia flow rate. The fibres consist of amorphous silicon oxynitride of composition Si0 2 xN4(1 :_xl; 3 (0.1 < x < 0.2). They exhibit a large spread in tensile strength. The lowest values (about 1 GPa) correspond to large surface defects caused by intergrowth while the highest values reach 5 G Pa for perfect fibres.The fibres are stable in nitrogen up to 1450°C (10h) in terms of composition, structure and mechanical behaviour owing to their high processing temperature (1450 °C) and the nitrogen pressure preventing decomposition. A superficial crystallization into Si3N4 is only observed at 1500 °C inducing a moderate decrease of strength. In argon, decomposition starts at 1400 °C yielding gaseous species (SiO and N2), crystalline ShN4 and free silicon beyond 1400 °C and induce a catastrophic drop of strength. Annealing in oxygen results in a growth of a protective Si02 scale, amorphous or partially crystalline at 1400 °C.

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Section: Introductionmentioning

confidence: 99%

“…ammonia), resulting in a fibre growth on an appropriate substrate [9]. Long staples of aligned silicon nitride fibres with large diameter (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) and length (several centimetres) were obtained, which were more adaptable to the processing of fibrous textures than short whiskers.…”

Section: Introductionmentioning

confidence: 99%