THE EFFECT OF CHARGE COMPONENT COMPOSITION ON THE STRUCTURE AND PROPERTIES OF TITANIUM MATRIX SINTERED COMPOSITES WITH HIGH MODULUS COMPOUNDS

 
О.М.Ivasyshyn,
 
О.О.Stasyuk,
 
D.G.Savvakin
 

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, #01/02
http://www.materials.kiev.ua/article/2309

Abstract

The effect of the matrix base (Ti and TiH2) of the starting powder and the type of reinforcing additives (5wt.% TiC, TiB2, В, and В4С) on the structurization features and some properties of metallic matrix composites sintered hereof is investigated. It is shown that the application of titanium hydride powder with TiC and TiB2 additives as the starting powder base allows obtaining sintered materials with lower porosity (≤2%) and higher hardness, compared to the composites produced based on commercial titanium powder. The microstructure of sintered composites considerably depends on the type of reinforcing additives. Spherical particles of TiC are hardly interacting with the metal matrix during sintering and have a relatively equilibrium form, while TiB inclusions (in case of using TiB2 as an additive) have needle-shaped particles 1–5 μm in dia. and 10–25 μm in length. The microstructure of the composites sintered of TiH2 and B4C powder mixture contains 20–50 μm conglomerates of fine needle-shaped particles of titanium boride phases and insignificant content of globular ТіС particles.


BORIDE, CARBIDE, METAL-MATRIX COMPOSITE, POWDER ADDITION, POWDER METALLURGY, SINTERING, STRUCTURE, TITANIUM HYDRYDE