Beneficial Effects of AlN as Sintering Aid on Microstructure and Mechanical Properties of Hot‐pressed ZrB2

F Monteverde, A Bellosi - Advanced Engineering Materials, 2003 - Wiley Online Library
F Monteverde, A Bellosi
Advanced Engineering Materials, 2003Wiley Online Library
Higher density of ZrB2 ceramics than with the pure material is achieved when 4.6% of
aluminum nitride are added before hot‐pressing as a sintering aid. AlN supports
densification and prevents grain coarsening, mainly by virtue of its ability to remove the
boron oxide layer that otherwise covers ZrB2 particles. The new material (see Figure for an
SEM image of a polished section) has outstanding mechanical properties, eg strength
values of 600 and 200 MPa at 25 and 1500° C.
Higher density of ZrB2 ceramics than with the pure material is achieved when 4.6 % of aluminum nitride are added before hot‐pressing as a sintering aid. AlN supports densification and prevents grain coarsening, mainly by virtue of its ability to remove the boron oxide layer that otherwise covers ZrB2 particles. The new material (see Figure for an SEM image of a polished section) has outstanding mechanical properties, e.g. strength values of 600 and 200 MPa at 25 and 1500 °C.
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