New wear-resistant materials for mining applications
AbstractEconomic and political driving forces are leading to an ambitious search for substitutes for fused
tungsten carbide (FTC) in ultra-high wear-resistant metal matrix composites (MMC), which are
used for mining applications. In the presented paper, possible substitutes such as alumina (Al2O3),
zirconia (ZrO2) and silicon carbide (SiC) are discussed. To enhance the wettability of oxides (e. g.
Al2O3, ZrO2) by Fe-base melts or to counteract strong dissolution of metastable covalent bonded
hard-particles (e.g. SiC) it is proposed to coat the particles with a thin titanium nitride (TiN) layer by
means of chemical vapor deposition (CVD). For this reason a CVD-apparatus for particle coating
was constructed and is shown in this paper. In addition, it is demonstrated that such a TiN coating
on the oxide particles can increase the wettability and therefore improve the embedding behavior
of the particles into a Fe-base matrix. In addition, it is shown that TiN coatings on covalent bonded
hard-particle SiC can be used as a diffusion barrier coating, thus counteracting a dissolution of the
hard-particles during processing by sintering techniques. However, due to the difference in linear
thermal expansion coefficients the coating tends to delaminate, partially.
How to Cite
Brust, S., Röttger, A., & Theisen, W. (2015). New wear-resistant materials for mining applications. International Conference on Stone and Concrete Machining (ICSCM), 3, 272–280. https://doi.org/10.13154/icscm.3.2015.272-280