High-temperature friction of refractory compounds

 
D.Yurchenko,
 
Y.Tkachenko
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2008, #01/02
http://www.materials.kiev.ua/article/697

Abstract

The paper examines the phase composition, structure, and properties of AlN-MoSi2 alloys and associated electrospark-deposited coatings on titanium. It is shown that the best values of erosion and mass transfer are characteristic of alloys containing 60-80 wt. % MoSisub>2 and that the erosive characteristics essentially depend on the electrospark treatment parame- ters. A protective coating with a thickness of 30-40 μm and hardness no less than 1 GPa is formed on the substrate. There is a thermal impact area up to 300 μт deep and 1.4 GPa hard under the coating. The high-temperature holding of coated samples promotes the rapid for- mation of heat-resistance phases in the coating and the formation of a secondary structure in the thermal impact area. As a result, this area becomes thicker and the hardness of its mate- rial increases up to 1.9 GPa.


FRICTION, HIGH TEMPERATURE, REFRACTORY COMPOUNDS, SURFACE STRUCTURE, WEAR