Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 6, Pages 3527-3534Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.12.050
Keywords
Nanocomposites; Tungsten; Alumina; Gelcasting; In situ synthesis; Colloidal processing
Categories
Funding
- National Science Centre of Poland (NCN) [2014/13/N/ST5/03438]
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Al2O3-W nanocomposites prepared by gelcasting exhibit highly homogeneous distribution of nano-tungsten particles, leading to improved mechanical properties in terms of hardness and fracture toughness compared to pure aluminum oxide.
The preparation process and the properties of Al2O3-W nanocomposites obtained by gelcasting are reported. The novelty of the synthesis path is the formation of nano-tungsten particles in an in situ reduction of water-soluble precursor during pressureless sintering. The use of water-soluble salt as a tungsten precursor ensured highly homogenous distribution of reinforcing particles and good adhesion between ceramic and metal phases. The maximum content of tungsten in the composites was approximately 0.5 wt%. The size of the reinforcing particles was less than 100 nm. Presence of metallic tungsten and tungsten carbide (W2C) in the composites lead to the improvement of mechanical parameters: an increase of hardness by about 10 % and of fracture toughness by about 20 %, compared to the reference sample of pure aluminum oxide.
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