Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 37, Issue 5, Pages 2031-2037Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.01.005
Keywords
FAST/SPS; Ceramic matrix composites; WC-MgO; X-ray diffraction; Mechanical properties
Categories
Funding
- Dr.-Erich-Kruger Foundation
- Cluster of Excellence Structure Design of Novel High-Performance Materials via Atomic Design and Defect Engineering (ADDE) by the European Union (European Regional Development Fund)
- Ministry of Science and Fine Arts of Saxony (SMWK) [100125123]
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Two different preparation routes were applied to process WC-MgO composites with varying MgO contents (4.1 wt.% and 5.9 wt.% MgO). WC-MgO powder mixtures were synthesized by a milling process at 600 rpm for 6 h of partially oxidized WC (WC + WO3), Mg-3 N-2 and C. Alternatively, WC and MgO as initial powders were used. For consolidation of the powder mixtures the field-assisted sintering technology (FAST) was used. X-ray diffraction shows that samples out of different powder mixtures and sintered between 1600 degrees C and 1750 degrees C exhibited WC, MgO and the W2C phase independent of the preparation route of the powder mixtures. A higher density and better mechanical properties (hardness and indentation fracture toughness) of WC-MgO were achieved of pure WC and MgO as initial powders were consolidated by FAST. It was found that a lower MgO content results in higher hardness values and in a slightly decreased indentation fracture toughness. (C) 2017 Elsevier Ltd. All rights reserved.
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