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| Abstract No.: |
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Scheduled at:
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Friday, May 23, 2014, Hall H3 12:20 PM
Pre- & Post-Treatment
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| Title: |
Post-treatment of plasma sprayed amorphous ceramic coatings by spark plasma sintering
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| Authors: |
Tomas Chraska* / Czech Academy of Sciences, Czech Republic
Jan Medricky / Institute of Plasma Physcis ASCR, Czech Republic
Jakub Cinert/ Institute of Plasma Physcis ASCR, Czech Republic
Tomas Kubatik/ Institute of Plasma Physcis ASCR, Czech Republic
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| Abstract: |
Two different ceramic materials have been plasma sprayed using a water stabilized plasma torch (WSP) to produce free standing coatings. The as-sprayed materials have very low porosity and are mostly amorphous. Both of the amorphous materials crystallize at temperatures above 900 C. A spark plasma sintering apparatus has been used to heat the as-sprayed samples to temperatures above 900C to induce crystallization while at the same time a uniaxial pressure of 80 GPa has been applied to the their surface. After such post-treatment, the ceramic samples are crystalline and exhibit very low open porosity. The as-sprayed amorphous materials also exhibit high hardness and high abrasion resistance. Both properties are significantly improved in the heat-treated samples whose microstructure is best described as nanocomposite with the very small crystallites embedded in an amorphous matrix.
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