NiCr/Cr_3C_2-BaF_2·CaF_2高温自润滑耐磨涂层的制备与摩擦磨损特性
Preparation and Tribological Properties of NiCr/Cr_3C_2-BaF_2·CaF_2 High Temperature Self-lubricating Wear-resistant Coating
查看参考文献14篇
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文摘
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采用加压氢气还原和固相合金化技术,以BaF_2·CaF_2共晶、Cr_3C_2颗粒为核心,制备了NiCr合金包覆的NiCr/Cr_3C_2-BaF_2·CaF_2复合粉末,采用大气等离子喷涂技术制备相应涂层.采用扫描电子显微镜、X射线衍射和SRV摩擦磨损试验机等分析测试技术,研究了涂层组成、结构以及从室温到500 ℃涂层的摩擦磨损性能.研究结果表明:研制的NiCr/Cr_3C_2-BaF_2·CaF_2复合涂层是一种性能优良的高温自润滑耐磨涂层,表面包覆的致密NiCr层抑制了喷涂过程中颗粒的氧化、脱碳和烧蚀,涂层的显微硬度和结合强度较高;涂层在室温下的摩擦系数为0.74±0.02,随温度升高摩擦系数逐渐降低,500 ℃时降低为0.38±0.03,涂层和对偶球Si_3N_4的磨损率与室温相比显著下降.摩擦机理研究发现,高温下BaF_2·CaF_2共晶软化,导致涂层剪切强度比室温时明显变低,在摩擦表面形成了连续的BaF_2·CaF_2润滑膜. |
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其他语种文摘
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BaF_2 ·CaF_2 eutectic and Cr_3C_2 composite powders coated with NiCr alloy were prepared with the technology of hydrogen reduction hydrothermal process combined with a solid state alloying. NiCr/Cr_3C_2 - BaF_2 ·CaF_2 coating was produced by atmospheric plasma spray ( APS) using the prepared powders. The microstructure and phase compositions of the powders as well as the deposited coating were analyzed by SEM and XRD, while the friction and wear behavior of the coatings from room temperature to 500℃ were evaluated using a SRV high temperature tribometer. The NiCr/Cr_3C_2 - BaF_2 ·CaF_2 composite coating exhibited excellent wear - resistant performance by high temperature self ?lubrication with high microhardness and cohesive strength. Oxidation, decarburization and ablation of Cr_3C_2 - BaF_2 ·CaF_2 during spray were avoided due to the protection by NiCr layer. The friction coefficient of the coating, 0.74 ±0.02 at room temperature, gradually decreased with the increase of temperature, a small value of 0. 38 ±0.03 was achieved as temperature up to 500℃, which led to a significant decrease of wear rates of both of the coating and the Si_3N_4 ball. BaF_2 ·CaF_2 eutectic underwent a transition with decrease of shear strength at high temperature from brittle to plastic state, which resulted in the formation on a continuous lubricating layer in the wear track at 500 ℃. |
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来源
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摩擦学学报
,2009,29(1):68-74 【核心库】
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关键词
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包覆粉末
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等离子喷涂
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NiCr/Cr_3C_2-BaF_2·CaF_2涂层
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摩擦磨损性能
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地址
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中国科学院过程工程研究所, 多相复杂系统国家重点实验室, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1004-0595 |
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学科
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机械、仪表工业 |
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文献收藏号
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CSCD:3523304
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