Low-Temperature Spark Plasma Sintering of Pure Nano WC Powder

For the first time we have demonstrated the densification of high‐purity nanostructured (davg ≈ 60 nm) tungsten carbide by High Pressure Spark Plasma Sintering (HPSPS) in the unusually low temperature range of 1200°C–1400°C. The high‐pressure sintering (i.e., 300 MPa) produced dense material at a te...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2013-06, Vol.96 (6), p.1702-1705
Main Authors: Grasso, Salvatore, Poetschke, Johannes, Richter, Volkmar, Maizza, Giovanni, Sakka, Yoshio, Reece, Michael J.
Format: Article
Language:English
Subjects:
Ceramics
Chemical compounds
Densification
Fracture toughness
Grain growth
Inhibitors
Nanocomposites
Nanomaterials
Nanostructure
Nanostructured materials
Plasma sintering
Sintering (powder metallurgy)
Spark plasma sintering
Temperature effects
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Summary:For the first time we have demonstrated the densification of high‐purity nanostructured (davg ≈ 60 nm) tungsten carbide by High Pressure Spark Plasma Sintering (HPSPS) in the unusually low temperature range of 1200°C–1400°C. The high‐pressure sintering (i.e., 300 MPa) produced dense material at a temperature as low as 1400°C. In comparison with more conventional sintering techniques, such as SPS (80 MPa) or hot isostatic pressing, HPSPS lowered the temperature required for full densification by 400°C–500°C. High Pressure Spark Plasma Sintering, even in absence of any sintering aid or grain growth inhibitor, retained a very fine microstructure resulting in a significant improvement in both hardness (2721 HV10) and fracture toughness (7.2 MPa m1/2).
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.12365