Details

Autor(en) / Beteiligte

• Zhang, Shi C.
• Hilmas, Greg E.
• Fahrenholtz, William G.

Titel

Improved Oxidation Resistance of Zirconium Diboride by Tungsten Carbide Additions

Ist Teil von

• Journal of the American Ceramic Society, 2008-11, Vol.91 (11), p.3530-3535

Ort / Verlag

Malden, USA: Blackwell Publishing Inc

Erscheinungsjahr

2008

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The effect of tungsten carbide (WC) additions on the oxidation resistance of zirconium diboride (ZrB2) was studied. Zirconium diboride ceramics, nominally pure and with the addition of 4 mol% WC, were densified by pressureless sintering. During densification, the WC that was added to the ceramic dissolved into the ZrB2 matrix, forming a solid solution. Oxidation behavior was evaluated using thermal gravimetric analysis up to 1500°C and isothermal furnace oxidation at 1500° and 1600°C. The WC additions reduced both the weight gain and the oxide scale thickness. After oxidation at 1600°C for 3 h, the mass gain decreased from 22 mg/cm2 for nominally pure ZrB2 to 8 mg/cm2 for the WC‐containing ceramic. Analysis showed that the WC additions improved the oxidation resistance of ZrB2 by promoting densification of the zirconia scale formed during oxidation through liquid‐phase sintering.