Spark plasma sintering of HfB2 with low additions of silicides of molybdenum and tantalum
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Add time:08/03/2019 Source:sciencedirect.com
HfB2-based composites containing 3 vol% silicides of molybdenum or tantalum as sintering additives are densified by spark plasma sintering at 1900–2000 °C. Mechanical properties are measured up to 1500 °C in air. 4-pt Flexural strength values at 1500 °C are 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 is insensitive to the temperature change and reaches 5 MPa m1/2 for the TaSi2-doped ceramic.
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