Effect of TiO 2 content on wear performance and mechanisms of aluminum oxide based ceramic coatings

Sun Hui Yao, Yean-Liang Su, Wen Xian Gao

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Abstract

The effect of TiO 2 content on crystalline structure and constituent phases, micro-harness, friction-wear performance and wear mechanisms of air plasma sprayed Al 2 O 3 based coatings was studied. Three variations of 0, 13% and 40% for TiO 2 content in weight ratio percentage were selected, namely, pure Al 2 O 3 , Al 2 O 3 -13%(wt)TiO 2 and Al 2 O 3 -40%(wt)TiO 2 ceramic coatings. XRD was used to analyze crystalline structure and constituent phases of coatings and Vickers micro-hardness tester to measure micro-hardness of coatings. An SRV wear tester was employed to evaluate friction-wear performance of the coatings under dry condition using two types of wear counterparts with extremely discrepant material nature, i. e. AISI52100 steel ball and Al 2 O 3 ceramic ball. Wear mechanisms were examined with SEM. The results showed that the hardness of coatings decreased with the increase of TiO 2 content. The Al 2 O 3 based ceramic coatings showed the same trend irrespective of material nature of wear parts, indicating that the wear resistance decreased with increasing TiO 2 content. No strengthening in wear performance was obtained with Al 2 O 3 based coatings with TiO 2 .

Original languageEnglish
Pages (from-to)204-208
Number of pages5
JournalSichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition)
Volume43
Issue number3
Publication statusPublished - 2011 May 1

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Ceramic coatings
Wear of materials
Aluminum
Oxides
Coatings
Microhardness
Friction
Crystalline materials
Wear resistance
Hardness
Plasmas
Scanning electron microscopy
Steel
Air

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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title = "Effect of TiO 2 content on wear performance and mechanisms of aluminum oxide based ceramic coatings",
abstract = "The effect of TiO 2 content on crystalline structure and constituent phases, micro-harness, friction-wear performance and wear mechanisms of air plasma sprayed Al 2 O 3 based coatings was studied. Three variations of 0, 13{\%} and 40{\%} for TiO 2 content in weight ratio percentage were selected, namely, pure Al 2 O 3 , Al 2 O 3 -13{\%}(wt)TiO 2 and Al 2 O 3 -40{\%}(wt)TiO 2 ceramic coatings. XRD was used to analyze crystalline structure and constituent phases of coatings and Vickers micro-hardness tester to measure micro-hardness of coatings. An SRV wear tester was employed to evaluate friction-wear performance of the coatings under dry condition using two types of wear counterparts with extremely discrepant material nature, i. e. AISI52100 steel ball and Al 2 O 3 ceramic ball. Wear mechanisms were examined with SEM. The results showed that the hardness of coatings decreased with the increase of TiO 2 content. The Al 2 O 3 based ceramic coatings showed the same trend irrespective of material nature of wear parts, indicating that the wear resistance decreased with increasing TiO 2 content. No strengthening in wear performance was obtained with Al 2 O 3 based coatings with TiO 2 .",
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