Abstract
Titanium- and chromium-based carbides are attractive coating materials to impart wear resistance. Suspension plasma spraying (SPS) is a relatively new thermal spray process which has shown a facile ability to use sub-micron and nano-sized feedstock to deposit high-performance coatings. The specific novelty of this work lies in the processing of fine-sized titanium and chromium carbides (TiC and Cr3C2) in the form of aqueous suspensions to fabricate wear-resistant coatings by SPS. The resulting coatings were characterized by surface morphology, microstructure, phase constitution, and micro-hardness. The abrasive, erosive, and sliding wear performance of the SPS-processed TiC and Cr3C2 coatings was also evaluated. The results amply demonstrate that SPS is a promising route to manufacture superior wear-resistant carbide-based coatings with minimal in situ oxidation during their processing.
Highlights
Wear is a severe problem in a vast majority of industrial applications, leading to reduced durability of engineering components and increased frequency of replacement shutdowns
(100 nm–5 μm diameter) [5], and has already shown promise for yielding thermal barrier coatings (TBCs) with improved performance compared to atmospheric plasma spraying (APS) [6]
This implies minimal reported similar findings related to amorphous phase content in tungsten-carbide-based coatings decarburization, considerable amounts of titanium oxides were noted to have formed during deposited by high velocity oxy-fuel (HVOF) [17]
Summary
Wear is a severe problem in a vast majority of industrial applications, leading to reduced durability of engineering components and increased frequency of replacement shutdowns. The reason for the minimal oxidation of carbides in SPS-processed coatings compared to APS can be attributed to the presence of a solvent (ethanol or water) which has been ona TBCs. In particular, have been very few prior efforts to deposit pure carbidefeedstock coatings consumes considerable part ofthere the plasma energy during its evaporation, minimizing by SPS, which are ideal candidates for mitigating wear. Carbide (TiC)etand reported similar findings (minimal oxidation) for WC-Co coatings, demonstrating chromium carbide (Cr3C2) coatings (without any metal or alloy binder) produced by SPS. Water-based suspensions modes wasby were chosen due to their higher surface tension versus ethanol, which promotes the formation of Experimental relatively denserWork coatings [9]. Water-based suspensions were chosen due to their higher surface tension versus ethanol, which promotes the formation of relatively denser
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