Micromechanical behaviour and wear resistance of hybrid plasma-sprayed TiC reinforced Tribaloy-400Show others and affiliations
2021 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 425, article id 127682Article in journal (Refereed) Published
Abstract [en]
Cobalt-based alloys such as Tribaloy-400 are known for their sliding wear resistance at room as well as elevated temperature. However, further enhancement in terms of hardness and wear resistance could be achieved by creating metal matrix composites reinforced by ceramic particles. For this purpose, Tribaloy-400 based coatings were deposited with the addition of different amounts of TiC reinforcement (≈25 vol%, ≈40 vol%, ≈60 vol%) through a “hybrid” plasma spray process, using a dry Tribaloy-400 powder with 10–45 μm particle size and a water-based TiC suspension (d50 = 2.2 μm). Pure Tribaloy and pure TiC coatings were employed for comparison. During spraying, TiC was partly oxidized but could nonetheless be embedded between the bigger Tribaloy-400 lamellae. Specifically, the coating containing ≈ 25 vol% TiC shows a homogeneous microstructure, whilst greater amounts of hard phase lead to some agglomeration. Accordingly, the coating with 25 vol% TiC exhibits a good combination of hardness and toughness (the latter being assessed by scratch testing) and low sliding wear rates of ≈10−5–10−6 mm3/(N·m) from room temperature up to 700 °C in ball-on-disc tests against an Al2O3 counterbody. At room temperature, the tribological behaviour of the coatings is controlled by abrasive grooving and spallation due to surface fatigue. With increasing temperature, tribochemical phenomena take on an ever-increasing role and, at 700 °C, a uniform, oxide-based tribofilm is developed, so that the wear rates are often lower than are recorded at 400 °C.
Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 425, article id 127682
Keywords [en]
Alumina; Aluminum oxide; Cobalt alloys; Hardness; Metallic matrix composites; Particle reinforced composites; Particle size; Plasma jets; Plasma spraying; Reinforcement; Suspensions (fluids); Tribology; Wear of materials; Wear resistance, Ceramic reinforcements; Ceramics particles; Cobalt-based alloys; Elevated temperature; Hybrid suspension; Hybrid suspension-powder plasma spray; Micromechanical behaviour; Sliding wear; Tribaloy 400; Wear-rate, Titanium carbide
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-17467DOI: 10.1016/j.surfcoat.2021.127682ISI: 000697568100010Scopus ID: 2-s2.0-85114681941OAI: oai:DiVA.org:hv-17467DiVA, id: diva2:1595743
Note
cited By 0
2021-09-202021-09-202022-03-31Bibliographically approved