|
Abstract No.: |
|
Scheduled at:
|
Friday, May 23, 2014, Hall H3 12:20 PM Pre- & Post-Treatment
|
|
Title: |
Post-treatment of plasma sprayed amorphous ceramic coatings by spark plasma sintering
|
|
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
|
|
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.
|
|