Boron Nitride Doped Transparent Polycrystalline Silicon Nitride Ceramics

Abstract:

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The addition of h- BN to a polycrystalline Si3N4 was to increase the fracture toughness and other mechanical properties such as flexural strength and hardness of the material. The hot pressed samples were prepared from the mixture of α-Si3N4, AlN, MgO and h-BN. The composite contained from 0 to 2 wt.% BN powder with sintering aids (9% AlN + 3% MgO). The transparency, mechanical properties and microstructure of hot pressed polycrystalline Si3N4-BN composite materials were investigated by UV/VIS spectrophotometer, scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The transparency decreased with increasing the content of h-BN into Si3N4.

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Periodical:

Edited by:

Hyungsun Kim, JianFeng Yang, Tohru Sekino, Masakazu Anpo and Soo Wohn Lee

Pages:

428-431

DOI:

10.4028/www.scientific.net/MSF.658.428

Citation:

B. Joshi et al., "Boron Nitride Doped Transparent Polycrystalline Silicon Nitride Ceramics", Materials Science Forum, Vol. 658, pp. 428-431, 2010

Online since:

July 2010

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$35.00

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