Volume 32, Number 2 (Dec 2013)                   jame 2013, 32(2): 101-115 | Back to browse issues page


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E. Sadri, F. Ashrafizadeh, M. Ramazani. Production and characterization of Cr2O3-Ag nanostructured composite powders in plasma spraying process. jame. 2013; 32 (2) :101-115
URL: http://jame.iut.ac.ir/article-1-563-en.html

Department of Materials Engineering, Isfahan University of Technology,
Abstract:   (1645 Views)
In plasma sprayed nanostructured composite coatings with ceramic matrix, the feedstock must consist of nanoparticles of appropriate specifications. In this research, the procedure for production of Cr2O3-Ag agglomerated nanostructured composite powder to produce comosite coatings has been investigated. Nanopowders of Cr2O3 with 0, 2, 5, and 10 volume percentages of silver were dispersed to obtain a homogeneous aqueous dispersion appropriate for spray drying process. In the second stage, Cr2O3-Ag composite powders were produced by agglomeration process. The nanostructured composite powders were, then, used in the atmospheric plasma spray (APS) process to deposit a series of composite coatings for evaluation. The composite powders, with a granulated morphology, had uniform distribution of silver in a ceramic matrix and the coatings were composed of nanoparticles and particles of nano-sized crystallites. Experimental results indicated that presence of nanoparticle zones within the microstructure led to non-uniform porosities formed between splats and these zones. Furthermore, use of nanopowders in the feedstock caused a reduction in lamellae thickness of plasma sprayed coatings.
Full-Text [PDF 2303 kb]   (373 Downloads)    
Type of Study: Research | Subject: General
Received: 2015/02/9 | Accepted: 2015/05/6 | Published: 2015/05/6

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