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 5MPa m1/2 for the TaSi2-doped ceramic.
Spark plasma sintering of Hfb2 with low additions of silicides of molybdenum and tantalum
Sciti D;Silvestroni L
2010
Abstract
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 5MPa m1/2 for the TaSi2-doped ceramic.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
