在低温摩擦下进行激光覆盖的球形WB增强的共基涂层
Li Fan1, Haiyan Chen2, Guangkuo Zhu2
1College of Mechanical and Electronic Engineering, Shanghai Jian Qiao University, Shanghai 201306, China.
Materials (Basel, Switzerland)
|October 14, 2023
概括
将球形碳化物 (WB) 添加到 (Co) 基涂料中,可显著提高低温耐磨性. 该Co + 45%WB涂层表现出异常的耐磨性,使其适用于苛刻的应用.
科学领域:
- 材料科学 材料科学 材料科学
- 部落学 (tribology) 是一个学科.
- 表面工程是什么?表面工程是什么?
背景情况:
- 基于的合金广泛用于耐磨应用.
- 增强涂料的三元学性质,特别是在低温下,对于在寒冷环境中的性能至关重要.
- 碳化 (WB) 是一种硬陶材料,以其耐磨性而闻名.
研究的目的:
- 研究球形WB增强对激光涂层Co-based涂料微观结构和低温tribological特性的影响.
- 为了评估这些涂料的磨损机制在干滑和在-20°C的NaCl溶液下.
- 为了确定最佳的WB含量,以提高耐磨性.
主要方法:
- 使用激光涂层制造具有不同WB含量 (0%,15%,45%) 的基于Co的涂层.
- 微结构和相位分析使用扫描电子显微镜 (SEM) 与能量分散光谱 (EDS) 和X射线衍射 (XRD).
- 在-20°C的低温 tribological 测试,包括摩擦系数测量,轨道磨损概况 (2D 和 3D) 和表面形态分析.
主要成果:
- 在WB增强涂层中识别的相包括γ-Co,Cr23C6C7C3,WB和WO.
- 在干滑下-20°C时,增加的WB含量与较低的摩擦系数和显著降低的磨损率相关,Co + 45%WB涂层的磨损率为3.567 × 10-4mm/N·m-1.
- 磨损磨损是WB添加涂料粗表面的主导机制.
- 在3.5%重量NaCl溶液中,由于塑料变形和滑,磨损轨迹较浅,带有延长的槽槽.
结论:
- 球形WB增强有效地提高了Co-based涂料在低温下的耐磨性.
- 与基础Co涂层和Co + 15%WB涂层相比,Co + 45%WB涂层显示出更高的磨损性能.
- WB颗粒的存在和操作环境 (干燥与NaCl溶液) 影响着磨损机制和整体的 Tribological 行为.
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