Sintering Study of Al₂O₃/NbC/Wc Micro-Nanocomposite

Abstract:

Ceramic materials based on alumina are considered excellent for produce cutting tools used to machining hard metals. However, low mechanical strength and toughness presented by these materials limit their application. Traditionally particles, such as TiC, TiN and ZrO₂, are added to the alumina matrix to improve their mechanical properties, increasing the range of applications. Recent studies have shown that the addition of particles of different sizes in alumina matrix can promote simultaneous increase in mechanical strength and tenacity. In this work sintering behavior of Al₂O₃ micro-nanocomposite containing nanometric particles of NbC and micrometric particles of WC, was studied by dilatometry using heating rate of 20°C/min up to 1800°C. The addition of carbides in alumina matrix is prejudicial to sintering causing an increase in temperature of shrinkage.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 597-602
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.597
• Online since: August 2012
• Authors: Vania Trombini, Karolina Pereira Santos Tonello, Thais Santos, José Carlos Bressiani, Ana Helena de Almeida Bressiani
• Keywords: Alumina, Micro-Nanocomposite, NbC, Sintering, WC

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