Enhanced densification of TaC coating on graphite substrate via cobalt-assisted liquid phase sintering using wet powder process
Year: 2024
Type: article
Abstract: In this work, tantalum carbide (TaC) coatings were prepared on graphite substrates using a wet powder forming and sintering process with the addition of cobalt (Co) as a sintering aid. The effects of cobalt content on the densification, phase composition, microstructure, and mechanical properties of the TaC coatings were investigated. The addition of a small amount of Co promoted the densification of the coating and enhanced its hardness and elastic modulus. At a Co content of 1.53 wt%, the coating exhibited a relative density of approximately 95.7%, a hardness of 18.1 GPa, and an elastic modulus of 395.0 GPa. Morphological analysis revealed the densification mechanism of the coating during the high-temperature sintering process. Under the influence of the Co liquid phase, TaC particles rearranged and underwent dissolution-precipitation in the liquid phase, ultimately achieving densification of the coating.
Institutions: Ankang University, Xi'an University of Technology
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,670
OpenAlex ID: W4404561963