ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Dense zirconium boride (ZrB2)-based materials with and without tungsten (W) have beenfabricated directly from mixtures of constituent elemental powders by pulsed electric currentpressure sintering (PECPS) at 1800°C for 10 min under 30 MPa in a vacuum. Formation processesof monolithic, W-doped ZrB2 solid solutions (Zr1-xWx)B2 (0〈x≤0.12), and composites consisting ofZrB2(ss) and WB2 were investigated. Their mechanical properties of Vickers hardness (Hv), fracturetoughness (KIC), and bending strength (σb) at room temperature were evaluated. Solid solution andcomposite materials gave higher Hv (~20.7 GPa), KIC (∼4.4 MPam1/2), and σb (~600 and 690 MPafor the former and the latter, respectively) than those (14.1 GPa, 3.21 MPam1/2, and ~500 MPa) ofthe monolithic ZrB2 fabricated under the same conditions. Furthermore, the latter two materialsexhibited excellent high-temperature σb values (~550-600 MPa) up to 1600°C in N2, in comparisonwith that (~320 MPa) of monolithic ZrB2 materials
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.527.pdf
Permalink