SURFACE MODIFICATION OF ZrB2–SiC CERAMICS FOR IMPROVING THEIR CORROSION RESISTANCE

   
D.V.Vedel,
 
А.V.Vasin,
 
А.В.Rusavsky,
 
О.М.Nazarov
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2018, #05/06
http://www.materials.kiev.ua/article/2530

Abstract

To improve the corrosion resistance of the ZrB2–15 vol.% SiC composite, SiC, SiO2 and SiO2–Er2O3 coatings were deposited by magnetron sputtering. The surface modification of the ZrB2–15 vol.% SiC ceramics improves their corrosion resistance through the development of a dense layer consisting of high-temperature phases formed in the oxidation process. In addition, the mechanical properties become twice as high (bending strength of the coated samples is 803–875 MPa). X-ray phase diffraction and scanning electron microscopy were used to examine the phase composition of the oxidation products and the structure of the resulting oxide film.


CORROSIVE RESISTANCE, ERBIUM, MAGNETRON SPUTTERING, OXIDE FILM