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Tribological properties of high velocity suspension flame sprayed (HVSFS) ceramic coatings

机译：高速悬架火焰喷涂（HVSFS）陶瓷涂层的摩擦学性质

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摘要

Ceramic coatings were manufactured by high-velocity suspension flame spraying (HVSFS). Finely dispersed isopropanol-based suspensions with submicron- and nanoscaled Al2O3, 3-YSZ and TiO2 powders were used as feedstock material. Microhardness, surface, microstructure, and phase composition of the final coating were characterized. The tribological properties were investigated via ball-on-disc test in NaCl solution and compared to those of high velocity oxy liquid fuel (HVOLF) sprayed WC/Co coatings. The ceramic coatings exhibited material specific hardness. The high surface roughness of Al2O3, mainly composed of gamma-phase, and TiO2, composed of anatase and rutile, could be explained by process inhomogeneities. While WC/Co was subjected to continuous wear due to abrasive processes and surface disruption, ceramic surfaces underwent a layer build-up, causing separation of the interacting surfaces and thus protection from increased wear. Considering tribo-chemical interactions between contacting materials and liquid medium, high chemical reactivity leads to high wear rates but moderate friction, whereas low reactivity results in low wear but high friction. Regarding potential application in pumps with SiC as standard material for sliding parts, 3-YSZ might be the most promising coating candidate due to moderate tribochemical interactions and therefore stable friction coefficients on a tolerable level and a similar wear rate compared with WC/Co.
机译：通过高速悬浮火焰喷涂（HVSF）制造陶瓷涂层。用亚微米和纳米级Al 2 O 3，3-YSZ和TiO 2粉末的基于基于异丙醇的悬浮液作为原料材料。表征了最终涂层的显微硬度，表面，微观结构和相组合物。通过NaCl溶液中的球形盘试验研究了摩擦学性质，并与高速氧液燃料（Hvolf）喷涂的WC / CO涂层相比。陶瓷涂层表现出材料特异性硬度。 Al 2 O 3的高表面粗糙度，主要由丙糖酶和金红石组成的γ相和TiO 2组成，可以通过工艺不均匀来解释。虽然WC / CO由于磨料过程和表面破坏而持续磨损，但陶瓷表面经历了层积聚，导致相互作用表面的分离，从而防止磨损增加。考虑到接触材料和液体介质之间的摩擦化学相互作用，高化学反应性导致高磨损率，但摩擦力为温度，而低反应性导致低磨损但高摩擦。关于用SiC作为滑动部件的标准材料泵的潜在应用，3-YSZ可能是由于中等的曲线化学相互作用，因此稳定的摩擦系数与WC / CO相比稳定的摩擦系数和类似的磨损率。

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