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HIGH-DISPERSIVE POWDERS IN BORIDE–SILICIDE SYSTEMS

G.N.Makarenko,
 
L.Krushynska,
 
I.Timofeeva,
 
M.Vasylkivska,
 
V.E.Matsera,
 
D.Zyatkevich,
 
V.Medyuh,
 
R.Medyuh,
 
V.F.Labunets,
 
† I.Uvarova
 

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, 2017, #09/10
http://www.materials.kiev.ua/article/2424

Abstract

Nanosized composite powders with a composition of titanium diboride–silicides of group IV–VI transition metals are obtained in boride–silicide systems by mechanochemical synthesis for 5–30 min. The initiation effect of TiB2 on the formation of silicide phases during joint mechanochemical synthesis is shown. It is established that the powder particles are 40–70 nm in size. The powders tend to agglomerating. The properties of hot-pressed compacted TiB2–20 wt.% МоSi2 samples are studied: ultimate bending strength 421 ± 29 MPa; microhardness 25 ± 0.8 GPa. Electrolytic Ni–TiB2–MoSi2 coatings has high wear-resistance in sliding friction and can be recommended for the hardening and recovering the surface of machine and mechanism parts.


COMPOSITE POWDERS, ELECTROPLATING, MECHANOCHEMICAL SYNTHESIS, SILICIDES OF TRANSITION METALS, TITANIUM DIBORIDE

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