Boron Nitride Ceramic Composite Obtained by High Pressure and High Temperature Sintering

Ana Lucia D. Skury; Carlos A. Oliveira Monteiro; Guerold Sergueevitch Bobrovinitchii; Sérgio Neves Monteiro

doi:10.4028/www.scientific.net/MSF.727-728.736

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Boron Nitride Ceramic Composite Obtained by High Pressure and High Temperature Sintering
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HomeMaterials Science ForumMaterials Science Forum Vols. 727-728Boron Nitride Ceramic Composite Obtained by High...

Boron Nitride Ceramic Composite Obtained by High Pressure and High Temperature Sintering

Abstract:

In the present work, by selecting Si₃N₄, TiB₂ and Al₂O₃ as binding agents as well as La₃O₂ as an additive, sintered wBN composites were studied. By modifying the number of sintering cycles, the composites processed at 4.5GPa and 1800^°C showed improved mechanical properties. The degree of transformation of the wBN, as well as the chemical reactions during the sintering process were discussed. This new composite material was found to present polycrystalline structure that provides superior cutting properties. Moreover, owing to superior properties, the wBN composite sharpens itself during cutting.

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Periodical:

Materials Science Forum (Volumes 727-728)

Pages:

736-739

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.727-728.736

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Online since:

August 2012

Authors:

Ana Lucia D. Skury, Carlos A. Oliveira Monteiro, Guerold Sergueevitch Bobrovinitchii, Sérgio Neves Monteiro

Keywords:

Ceramic Binder, Densification, Hardness, HPHT Cyclic Sintering, wBN Composite, Wear Resistance

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