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Simultaneous Synthesis and Consolidation of W-Added ZrB<sub>2</sub> by Pulsed Electric Current Pressure Sintering and their Mechanical Properties
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Dense zirconium boride (ZrB2)-based materials with and without tungsten (W) have been
fabricated directly from mixtures of constituent elemental powders by pulsed electric current
pressure sintering (PECPS) at 1800°C for 10 min under 30 MPa in a vacuum. Formation processes
of monolithic, W-doped ZrB2 solid solutions (Zr1-xWx)B2 (0<x≤0.12), and composites consisting of
ZrB2(ss) and WB2 were investigated. Their mechanical properties of Vickers hardness (Hv), fracture
toughness (KIC), and bending strength (σb) at room temperature were evaluated. Solid solution and
composite materials gave higher Hv (~20.7 GPa), KIC (∼4.4 MPam1/2), and σb (~600 and 690 MPa
for the former and the latter, respectively) than those (14.1 GPa, 3.21 MPam1/2, and ~500 MPa) of
the monolithic ZrB2 fabricated under the same conditions. Furthermore, the latter two materials
exhibited excellent high-temperature σb values (~550-600 MPa) up to 1600°C in N2, in comparison
with that (~320 MPa) of monolithic ZrB2 materials.
Trans Tech Publications, Ltd.
Title: Simultaneous Synthesis and Consolidation of W-Added ZrB<sub>2</sub> by Pulsed Electric Current Pressure Sintering and their Mechanical Properties
Description:
Dense zirconium boride (ZrB2)-based materials with and without tungsten (W) have been
fabricated directly from mixtures of constituent elemental powders by pulsed electric current
pressure sintering (PECPS) at 1800°C for 10 min under 30 MPa in a vacuum.
Formation processes
of monolithic, W-doped ZrB2 solid solutions (Zr1-xWx)B2 (0<x≤0.
12), and composites consisting of
ZrB2(ss) and WB2 were investigated.
Their mechanical properties of Vickers hardness (Hv), fracture
toughness (KIC), and bending strength (σb) at room temperature were evaluated.
Solid solution and
composite materials gave higher Hv (~20.
7 GPa), KIC (∼4.
4 MPam1/2), and σb (~600 and 690 MPa
for the former and the latter, respectively) than those (14.
1 GPa, 3.
21 MPam1/2, and ~500 MPa) of
the monolithic ZrB2 fabricated under the same conditions.
Furthermore, the latter two materials
exhibited excellent high-temperature σb values (~550-600 MPa) up to 1600°C in N2, in comparison
with that (~320 MPa) of monolithic ZrB2 materials.
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