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首页> 外文期刊>Journal of Materials Engineering and Performance >Improvement in Tribological Properties of Plasma-Sprayed Alumina Coating upon Carbon Nanotube Reinforcement
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Improvement in Tribological Properties of Plasma-Sprayed Alumina Coating upon Carbon Nanotube Reinforcement

机译：碳纳米管加固上等离子体喷涂氧化铝涂层摩擦学性能的改善

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摘要

Crushed alumina powder heterocoagulated with 1 or 2 wt.% carbon nanotube (CNT) was used to produce plasma-sprayed coatings with improved tribological properties. Heterocoagulation is a colloidal processing technique, and it was used to produce a homogenous mixture of CNT in alumina. These coatings were compared with a pristine alumina coating using a pin-on-disk setup under various speed-load conditions. A 6-mm-diameter WC-Co ball was used as counterbody. The wear resistance of the coatings increased in the following order: pristine alumina, alumina with 1 wt.% CNT, and alumina with 2 wt.% CNT. Wear progressed by low cycle fatigue, microfracture, and finally pulverization of the already dislodged wear debris on repeated rubbing by the counterbody. The higher wear resistance of the reinforced coatings is attributed to their higher hardness and fracture toughness. The pristine alumina coating was found to crumble owing to diffuse intergranular fracture beneath the surface during rubbing under higher speed and load. Upon crumbling, the pulverized debris assumed a paste-like form and was ejected at the top under the compressive action exerted by the counterbody at its leading edge. The high wear of the pristine alumina coating is attributed to this effect.
机译：用1或2重量％的氧化铝粉末杂蛋白杂蛋白。％碳纳米管（CNT）用于生产具有改善的摩擦性质的等离子体喷涂的涂层。杂橡胶是一种胶体加工技术，它用于在氧化铝中产生CNT的均匀混合物。使用在各种速度载荷条件下使用销盘型设置与原始氧化铝涂层进行比较这些涂层。 6毫升直径的WC-CO球用作鼠标体。涂层的耐磨性按以下顺序增加：原始氧化铝，氧化铝，1重量％的CNT，和2重量％CNT的氧化铝。通过低循环疲劳，微折衷，并最终粉碎已经脱落的磨损碎片的粉碎，对靶反复摩擦。增强涂层的较高耐磨性归因于其更高的硬度和断裂韧性。发现原始氧化铝涂层在摩擦下升高和载荷下摩擦下方表面下弥漫性骨折裂缝。在粉碎时，粉碎的碎片呈现糊状的形式，并在其前缘处施加的压缩作用下在顶部喷射。原始氧化铝涂层的高磨损归因于这种效果。

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