Tampere University of Technology

TUTCRIS Research Portal

High Temperature 3-body Abrasive Wear of HVOF and HVAF Sprayed Cr3C2-NiCr Coatings

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Details

Original languageEnglish
Title of host publicationSurface Modification Technologies XXVIII
Subtitle of host publicationProceedings of the Twenty Eighth International Conference on Surface Modification Technologies
EditorsT.S. Sudarshan, Petri Vuoristo, Heli Koivuluoto
PublisherValardocs
Pages67-75
Volume28
ISBN (Print)978-81-926196-1-3
Publication statusPublished - Jan 2015
Publication typeA4 Article in a conference publication
EventInternational Conference on Surface Modification Technologies - , Finland
Duration: 1 Jan 2000 → …

Conference

ConferenceInternational Conference on Surface Modification Technologies
CountryFinland
Period1/01/00 → …

Abstract

Wear protection is used in the industry to increase the lifetime of tribologically loaded components. One of the most widely applied wear protection is hard coating technology to protect the surface of a component from harsh wear conditions. Among them, thermal spraying is commonly adopted technique to deposit wear-resistant surface layers.

For wear protection at high service temperatures, chromium carbide based coatings deposited with high velocity oxy-fuel (HVOF) and high velocity air-fuel HVAF techniques are most suitable.

In this study, various Cr3C2-NiCr powders were sprayed with both HVOF and HVAF processes. The microstructure, porosity level and hardness values of the deposited coatings were measured. In addition, three-body abrasive wear resistance of these coatings was tested at 300°C, 500°C and 700°C. The wear tracks and cross sections of tested coatings were studied with scanning electron microscopy (SEM), in order to characterize the wear mechanisms at high
temperatures.

The results show that at lower testing temperatures, powder selection and spraying process defines the wear rate of the coating. However, at maximum testing temperature, the differences in wear rates between tested coatings decreases. This is due to microstructural changes in coating at high temperatures.

Publication forum classification

Field of science, Statistics Finland