赵磊,侯金保,孟军虎,韩杰胜.电接触烧结增强NiCr-Cr3C2涂层的显微组织和摩擦磨损行为研究[J].表面技术,2019,48(4):116-121.
ZHAO Lei,HOU Jin-bao,MENG Jun-hu,HAN Jie-sheng.Microstructure and Tribological Properties of NiCr-Cr3C2 Coating Deposited by Electro-contact Sintering[J].Surface Technology,2019,48(4):116-121 |
| 电接触烧结增强NiCr-Cr3C2涂层的显微组织和摩擦磨损行为研究 |
| Microstructure and Tribological Properties of NiCr-Cr3C2 Coating Deposited by Electro-contact Sintering |
| 投稿时间：2018-12-14 修订日期：2019-04-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.04.017 |
| 中文关键词: 电接触烧结 NiCr-Cr3C2 耐磨层 结合强度 抗磨损 显微组织 |
| 英文关键词:electro-contact sintering NiCr-Cr3C2 wear-resistant layer adhesion strength wear resistance microstructure |
| 基金项目: |
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| Author | Institution |
| ZHAO Lei | 1.Key Laboratory of Aeronautical Welding and Connection Technology, AVIC Manufacturing Technology Institute, Beijing 100024, China |
| HOU Jin-bao | 1.Key Laboratory of Aeronautical Welding and Connection Technology, AVIC Manufacturing Technology Institute, Beijing 100024, China |
| MENG Jun-hu | 2.Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
| HAN Jie-sheng | 2.Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
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| 中文摘要: |
| 目的 在等离子喷涂的基础上，采用电接触烧结技术制备具有良好摩擦学性能的NiCr-Cr3C2涂层。方法 采用等离子喷涂工艺将NiCr-Cr3C2涂层预置到GH4169合金试件表面，再经过电接触烧结工艺制备增强涂层。利用OM、SEM、XRD及EDS研究耐磨层的物相、显微组织及化学组成特征，并采用球盘式摩擦磨损试验机对涂层的摩擦学行为进行评价。结果 通过电接触烧结过程中的瞬时热效应，促进了NiCr-Cr3C2等离子喷涂层界面的塑性变形及热扩散，使涂层的孔隙率由5%降到2%，结合强度由46 MPa提升到210 MPa。在400 ℃和600 ℃时，摩擦表面可形成完整的摩擦层，共晶氟化物组分使涂层摩擦系数由室温至400 ℃条件下的0.8降低到600 ℃条件下的0.45。涂层在600 ℃条件下表现出氧化磨损的特征。结论 电接触烧结工艺能实现等离子喷涂NiCr-Cr3C2涂层的性能增强，获得较高结合强度、较低孔隙率和摩擦系数，在600 ℃条件下表现出较好的摩擦磨损性能。 |
| 英文摘要: |
| The work aims to prepare NiCr-Cr3C2 coating with good tribological properties by electro-contact sintering on the basis of plasma spraying. The reinforced NiCr-Cr3C2 coating was deposited by electro-contact sintering after prefabricated on GH4169 alloy by plasma spraying. The phases, structure and interface of NiCr-Cr3C2 coating were analyzed by OM, SEM, XRD and EDS. Tribological properties of the coating were evaluated by ball-disk rotating friction and wear tester. The instantaneous heating of electro-contact sintering promoted the plastic deformation and heat diffusion of NiCr-Cr3C2 coating deposited and decreased the porosity from 5% to 2% and increased the adhesion strength from 46 MPa to 210 MPa. A complete friction layer was formed on the friction surface of coating at 400 ℃ and 600 ℃. The coefficient of friction decreased from 0.8 at 400 ℃ to 0.45 at 600 ℃ due to the components of eutectic fluoride. The coating appeared oxidative wear at 600 ℃. Electro-contact sintering can enhance the properties of NiCr-Cr3C2 coating such as higher bonding strength, lower porosity and friction coefficient. The coating exhibits better friction and wear behaviors at 600 ℃. |
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