The densification behavior and mechanical properties of B4C hot-pressed at 2000 °C for 1 h with additions of Al2O3 up to 10 vol% were investigated. Sinterability was greatly improved by the addition of a small amount of Al2O3. The improvement was attributed to the enhanced mobility of elements through the Al2O3 near the melting temperature or a reaction product formed at the grain boundaries. As a result of this improvement in the density, mechanical properties, such as hardness, elastic modulus, strength, and fracture toughness, increased remarkably. However, when the amount of Al2O3 exceeded 5 vol%, the level of improvement in the mechanical properties, except for fracture toughness, was reduced presumably because of the high thermal mismatch between B4C and Al2O3.
|Number of pages||3|
|Journal||Journal of the American Ceramic Society|
|Publication status||Published - 2000 Nov 1|
ASJC Scopus subject areas
- Ceramics and Composites