Effect of Na<sub>2</sub>WO<sub>4</sub> in Electrolyte on Microstructure and Tribological Behavior of Micro-arc Oxidation Coatings on Ti<sub>2</sub>AlNb Alloy
Micro-arc oxidation (MAO) ceramic coatings were prepared on Ti<sub>2</sub>AlNb alloy in silicate/phosphate electrolytes with different concentrations of Na<sub>2</sub>WO<sub>4</sub>. The influence of Na<sub>2</sub>WO<sub>4</sub> on the coat...
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| Format: | Article |
| Language: | zho |
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Journal of Materials Engineering
2018-02-01
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| Series: | Cailiao gongcheng |
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| Online Access: | http://jme.biam.ac.cn/CN/Y2018/V46/I2/84 |
| _version_ | 1797967006507466752 |
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| author | LIU Xiao-hui WANG Shuai-xing DU Nan ZHAO Qing KANG Jia LIU Huan-huan |
| author_facet | LIU Xiao-hui WANG Shuai-xing DU Nan ZHAO Qing KANG Jia LIU Huan-huan |
| author_sort | LIU Xiao-hui |
| collection | DOAJ |
| description | Micro-arc oxidation (MAO) ceramic coatings were prepared on Ti<sub>2</sub>AlNb alloy in silicate/phosphate electrolytes with different concentrations of Na<sub>2</sub>WO<sub>4</sub>. The influence of Na<sub>2</sub>WO<sub>4</sub> on the coating growth process, coating structure and composition was analyzed by SEM, XRD and XPS. The tribological behavior of MAO coatings was evaluated by the ball-disc wear test. The results show that the growth rate of MAO coating in electrolyte without Na<sub>2</sub>WO<sub>4</sub> is only 0.08<i>μ</i>m/min, meanwhile, the coating is loose and rough, and "networks" connecting with big pores exist on the coating surface.The main phase compositions of this coating are rutile TiO<sub>2</sub>, anatase TiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, and Nb<sub>2</sub>O<sub>5</sub>. The addition of Na<sub>2</sub>WO<sub>4</sub> in the electrolyte shortens the time before sparking of Ti<sub>2</sub>AlNb alloy, increases the growth rate of the coating, improves the uniformity of coating and meanwhile, a small amount of WO<sub>3</sub> is introduced in the coating. Besides, MAO coatings formed in the participation of Na<sub>2</sub>WO<sub>4</sub> have better wear resistance. Severe abrasive wear occurs when the test is made on Ti<sub>2</sub>AlNb alloy with Si<sub>3</sub>N<sub>4</sub>, the friction coefficient reaches 0.5-0.7. Both the friction coefficient and wear rate decrease obviously when Ti<sub>2</sub>AlNb is treated by MAO. The friction coefficient and wear rate of MAO coating prepared in the electrolyte with 4g/L Na<sub>2</sub>WO<sub>4</sub> are 0.24 and 6.2×10<sup>-4</sup>mm<sup>3</sup>/(N·m), respectively. Only "fish scales" caused by fatigue wear appears on the coating surface. |
| first_indexed | 2024-04-11T02:24:21Z |
| format | Article |
| id | doaj.art-00b947bc80464f9dbeddc060dd0df225 |
| institution | Directory Open Access Journal |
| issn | 1001-4381 1001-4381 |
| language | zho |
| last_indexed | 2024-04-11T02:24:21Z |
| publishDate | 2018-02-01 |
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| series | Cailiao gongcheng |
| spelling | doaj.art-00b947bc80464f9dbeddc060dd0df2252023-01-02T22:55:37ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43811001-43812018-02-01462849210.11868/j.issn.1001-4381.2016.001366201802001366Effect of Na<sub>2</sub>WO<sub>4</sub> in Electrolyte on Microstructure and Tribological Behavior of Micro-arc Oxidation Coatings on Ti<sub>2</sub>AlNb AlloyLIU Xiao-hui0WANG Shuai-xing1DU Nan2ZHAO Qing3KANG Jia4LIU Huan-huan5National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, ChinaNational Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, ChinaNational Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, ChinaNational Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, ChinaNational Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, ChinaNational Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, ChinaMicro-arc oxidation (MAO) ceramic coatings were prepared on Ti<sub>2</sub>AlNb alloy in silicate/phosphate electrolytes with different concentrations of Na<sub>2</sub>WO<sub>4</sub>. The influence of Na<sub>2</sub>WO<sub>4</sub> on the coating growth process, coating structure and composition was analyzed by SEM, XRD and XPS. The tribological behavior of MAO coatings was evaluated by the ball-disc wear test. The results show that the growth rate of MAO coating in electrolyte without Na<sub>2</sub>WO<sub>4</sub> is only 0.08<i>μ</i>m/min, meanwhile, the coating is loose and rough, and "networks" connecting with big pores exist on the coating surface.The main phase compositions of this coating are rutile TiO<sub>2</sub>, anatase TiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, and Nb<sub>2</sub>O<sub>5</sub>. The addition of Na<sub>2</sub>WO<sub>4</sub> in the electrolyte shortens the time before sparking of Ti<sub>2</sub>AlNb alloy, increases the growth rate of the coating, improves the uniformity of coating and meanwhile, a small amount of WO<sub>3</sub> is introduced in the coating. Besides, MAO coatings formed in the participation of Na<sub>2</sub>WO<sub>4</sub> have better wear resistance. Severe abrasive wear occurs when the test is made on Ti<sub>2</sub>AlNb alloy with Si<sub>3</sub>N<sub>4</sub>, the friction coefficient reaches 0.5-0.7. Both the friction coefficient and wear rate decrease obviously when Ti<sub>2</sub>AlNb is treated by MAO. The friction coefficient and wear rate of MAO coating prepared in the electrolyte with 4g/L Na<sub>2</sub>WO<sub>4</sub> are 0.24 and 6.2×10<sup>-4</sup>mm<sup>3</sup>/(N·m), respectively. Only "fish scales" caused by fatigue wear appears on the coating surface.http://jme.biam.ac.cn/CN/Y2018/V46/I2/84Ti<sub>2</sub>AlNb alloymicro-arc oxidationNa<sub>2</sub>WO<sub>4</sub>tribological behavior |
| spellingShingle | LIU Xiao-hui WANG Shuai-xing DU Nan ZHAO Qing KANG Jia LIU Huan-huan Effect of Na<sub>2</sub>WO<sub>4</sub> in Electrolyte on Microstructure and Tribological Behavior of Micro-arc Oxidation Coatings on Ti<sub>2</sub>AlNb Alloy Cailiao gongcheng Ti<sub>2</sub>AlNb alloy micro-arc oxidation Na<sub>2</sub>WO<sub>4</sub> tribological behavior |
| title | Effect of Na<sub>2</sub>WO<sub>4</sub> in Electrolyte on Microstructure and Tribological Behavior of Micro-arc Oxidation Coatings on Ti<sub>2</sub>AlNb Alloy |
| title_full | Effect of Na<sub>2</sub>WO<sub>4</sub> in Electrolyte on Microstructure and Tribological Behavior of Micro-arc Oxidation Coatings on Ti<sub>2</sub>AlNb Alloy |
| title_fullStr | Effect of Na<sub>2</sub>WO<sub>4</sub> in Electrolyte on Microstructure and Tribological Behavior of Micro-arc Oxidation Coatings on Ti<sub>2</sub>AlNb Alloy |
| title_full_unstemmed | Effect of Na<sub>2</sub>WO<sub>4</sub> in Electrolyte on Microstructure and Tribological Behavior of Micro-arc Oxidation Coatings on Ti<sub>2</sub>AlNb Alloy |
| title_short | Effect of Na<sub>2</sub>WO<sub>4</sub> in Electrolyte on Microstructure and Tribological Behavior of Micro-arc Oxidation Coatings on Ti<sub>2</sub>AlNb Alloy |
| title_sort | effect of na sub 2 sub wo sub 4 sub in electrolyte on microstructure and tribological behavior of micro arc oxidation coatings on ti sub 2 sub alnb alloy |
| topic | Ti<sub>2</sub>AlNb alloy micro-arc oxidation Na<sub>2</sub>WO<sub>4</sub> tribological behavior |
| url | http://jme.biam.ac.cn/CN/Y2018/V46/I2/84 |
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