Spark plasma sintering of HfB2 with low additions of silicides of molybdenum and tantalum

HfB2-based composites containing 3 vol% silicides of molybdenum or tantalum as sintering additives were densified by spark plasma sintering at 1900-2000 C. The mechanical properties were measured up to 1500 C in air. The four-point flexural strength values at 1500 C were 480 MPa (64% of the RT value...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2010, Vol.30 (15), p.3253-3258
Main Authors: Sciti, D, Bonnefont, G, Fantozzi, G, Silvestroni, L
Format: Article
Language:English
Subjects:
Ceramics
Engineering Sciences
Flexural strength
Fracture toughness
Materials
Mechanical properties
Modulus of rupture in bending
Molybdenum
Silicides
Spark plasma sintering
Tantalum
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Summary:HfB2-based composites containing 3 vol% silicides of molybdenum or tantalum as sintering additives were densified by spark plasma sintering at 1900-2000 C. The mechanical properties were measured up to 1500 C in air. The four-point flexural strength values at 1500 C were 480 MPa (64% of the RT value) for the MoSi2-doped composite and 290 MPa (49% of the RT value) for the TaSi2-doped composite. The fracture toughness was insensitive to the temperature change and reached 5 MPa.m1/2 for the TaSi2-doped ceramics.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2010.06.006