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Effect of TiO2 and ZrO2 reinforcements on properties of Al2O3 coatings fabricated by thermal flame spraying Authors

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Effect of TiO2 and ZrO2 reinforcements on properties of Al2O3

coatings fabricated by thermal flame spraying

Authors

Rassim Younes, Mohand Amokrane Bradai, Abdelhamid Sadeddine, Youcef Mouadji, Ali Bilek, Abderrahim Benabbas

Publication date

2016/5/1

Journal

Transactions of Nonferrous Metals Society of China

Volume 26 Issue 5 Pages 1345-1352 Publisher Elsevier Description

The alumina composite coatings reinforced with 25% ZrO2 (denoted as AZ-25) and 3% TiO2 (denoted

as AT-3) were deposited on low carbon steel using a thermal flame spraying. The microstructure, phase composition, microhardness and tribological properties of the coatings were investigated. The XRD results of the coatings reinforced by TiO2 (AT-3) revealed the presence of α-Al2O3 phase as

matrix and new metastable phases of γ-Al2O3 and κ-Al2O3. However, the coatings reinforced by

ZrO2 (AZ-25) consist of α-Al2O3 as matrix, q-ZrO2 and m-ZrO2. In most studied conditions, the AT-3

coating displays a better tribological performance, i.e., lower coefficient of frictions and wear rates, than the AZ-25 coating. It was also found that the microhardness of the coatings was decreased with the reinforcement of ZrO2 and increased with TiO2.

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