ZHANG Xue-fei, REN Li-min. Microstructural Characteristics and Wear Performance of Plasma Sprayed Al2O3-13 wt. % TiO2 Coating on the Surface of Extrusion Wheel[J]. International Journal of Plant Engineering and Management, 2013, 18(3): 165-172

Microstructural Characteristics and Wear Performance of Plasma Sprayed Al2O3-13 wt. % TiO2 Coating on the Surface of Extrusion Wheel
ZHANG Xue-fei, REN Li-min
College of Mechanical Engineering,Changzhou University,Changzhou 213016, P.R. China
The conventional Al2O3-13 wt. % TiO2composite ceramic coatings are fabricated by plasma spraying on the surface of extrusion wheel. The microstructure,morphology and phase compositions of the substrate and coating are investigated by using X-ray diffractometry( XRD),scanning electron microsopy( SEM) and energy dispersive spectroscopy( EDS). Moreover,the microhardness of the substrate and the coating are investigated using Vickers microhardness tester,the friction and wear behaviors of the substrate and the coating are investigated by using a block-on-ring tribometer under dry sliding conditions with the load of 245 N. The results show that bothγ-Al2O3and α-Al2O3phases are observed in the as-sprayed coatings,the mian phase is γ-Al2O3. There are white particulates Al2O3on its surface. The Al2O3-13 wt. % TiO2coating possesses higher microhardness which is about1018HV and 1. 6 times that of the substrate. The wear performance of coating is better than that of the substrate.In a practical application,the life of the extrusion wheel which is plasma sprayed Al2O3-13 wt. % TiO2coating on the surface is 1. 2 times that of the conventional extrusion wheel,and the life is about 330 h.
Key words:    extrusion wheel    plasma spraying    Al2O3-13 wt.% TiO2 ceramic coating    wear performanc   
Received: 2013-07-08     Revised:
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[1] Lu P M,Wang Y H,Li B. Failure analysis on continuous extrusion-wheel die in root[J].Material & Heat Treatment,2010,39(22):191 ~193 (In Chinese)
[2] Wang D S,Tian Z J,Shen L D. Microstruc-tural characteristics and formation mechanism of Al2O3-13wt. % TiO2 coatings plasma-sprayed with nanostructured agglomerated powders[J]. Surface and Coatings Technolo-gy,2009, 203 (10/11):1298 ~ 1303 ( In Chinese)
[3] Wang S F,Liu H Y,Zhou P,Fei Y. Hot work die steel used for extrusion wheel[J].Heat Treatment of Metals,2012, 37(7):98~100 (In Chinese)
[4] Wang Y,Fan Z X,Song B Y. Measurement and simulation of temperature field on the wheel of TLJ400 continuous extrusion ma-chine[J]. Nonferrous Metals Processing,2007, 36(4):42 ~45 (In Chinese)
[5] Deng C M,Zhou K S,Liu M,Deng C G,Zhu H C. Properties of air plasma sprayed Al2O3-3% TiO2 coatings[J]. China Surface Engineering, 2010, 23(1):19 ~23 (In Chi-nese)
[6] Rao X X,Luo C,Hu S B,Li X Z. Study on performence of Al2O3-based ceramics coating prepared by plasma spraying[J]. Material &Heat Treatment, 2010, 39(20):99 ~103 (In Chinese)
[7] Tian W,Wang Y,Yang Y. Toughening and strengthening mechanism of plasma sprayed nanostructured Al2O3-13 wt. % TiO2 coat-ings[J]. Surface and Coatings Technology,2009, 204(5):642 ~649 (In Chinese)
[8] Wang Y,Tian W,Yang Y. Investigation of stress field and failure mode of plasma sprayed Al 2O3-13%TiO2 coatings under ther-mal shock[J]. Materials Science & Engi-neering,2009, 516 (1/2):103 ~ 110 ( In Chinese)
[9] Song R G, Wang C, Jiang Y, Lu G. Microstruc-ture and properties of plasma sprayed Al2O3/TiO2nano ceramic composite coatings[J]. Transac-tions of Materials and Heat Theatent,2012,11(33):145 ~150 (In Chinese)
[10] Tian Z J,Wang D S,Shen L D,Liu Z D,Huang Y H. Study on nanostructured Al2O3-13% TiO2 ceramic coatings by plasma-spraying[J]. Rare Meterials and Engineer-ing,2009, 38 (10):1740 ~ 1744 (In Chi-nese)