大气等离子喷涂TiB2-316L不锈钢基复合涂层及其耐磨性能
Wear resistance of TiB2-316L stainless steel matrix composite coatings deposited by atmospheric plasma spraying
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摘要: 分别采用高能球磨制备了TiB2含量(质量分数)为10%的316L不锈钢基复合粉,高能球磨与喷雾干燥造粒工艺制备了TiB2含量(质量分数)为40%的316L不锈钢基复合粉,大气等离子喷涂制备相应的TiB2-316L不锈钢基金属陶瓷涂层与316L不锈钢涂层。室温下采用高速环块磨损试验研究TiB2-316L不锈钢基金属陶瓷涂层的磨损特性。采用X射线衍射分析涂层物相,扫描电镜分析喷涂粉末、涂层结构和摩擦副磨损表面形貌。结果表明,大气等离子喷涂两种制粉工艺获得的316L不锈钢基TiB2复合粉能获得较耐磨的316L不锈钢基TiB2复合涂层,耐磨性高于316L不锈钢涂层,且TiB2在复合涂层中增强涂层耐磨性的原因是TiB2颗粒在涂层316L韧性基体中充当强化相,且TiB2在摩擦接触处摩擦氧化形成的氧化产物具有自润滑特性,能减少涂层的磨损量。Abstract: TiB2-316L stainless steel matrix composite powders contained 10mass% and 40mass% TiB2 were prepared by high energy ball milling and spray-drying processes respectively.Atmospheric plasma spraying deposited corresponding coatings and 316 L stainless steel coating.High velocity block-on-ring wear tester was used to test wear resistance of as-sprayed coatings.X-ray diffraction analyzed the constitution of as-sprayed coatings.Scanning electron microscope was employed to character as-sprayed coatings, feedstocks and the worn surface morphology.Results show that wear resistance of as-sprayed TiB2-316L stainless steel matrix composite coatings is prior to 316L stainless steel coating.TiB2 particles act as reinforcement component in the coating and oxides from tribo-oxidation of TiB2 in the tribo contact, which possessed self-lubricating function, can reduce mass loss of the coatings during sliding wear.
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Keywords:
- titanium-diboride /
- 316L stainless steel /
- ballmilling /
- spray-drying /
- atmospheric plasma spray
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