Thermally-sprayed alumina based materials, e.g., alumina-titania (Al2O3-TiO2), are commonly applied as wear resistant coatings in industrial applications. Properties of the coatings depend on the spray process, powder morphology, and chemical composition of the powder. In this study, wear resistant coatings from Al2O3 and Al2O3-13TiO2 powders were sprayed with plasma and high-velocity oxygen-fuel (HVOF) spray processes. Both, fused and crushed, and agglomerated and sintered Al2O3-13TiO2 powders were studied and compared to pure Al2O3. The coatings were tested for abrasion, erosion, and cavitation resistances in order to study the effect of the coating structure on the wear behavior. Improved coating properties were achieved when agglomerated and sintered nanostructured Al2O3-13TiO2 powder was used in plasma spraying. Coatings with the highest wear resistance in all tests were produced by HVOF spraying from fused and crushed powders.
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机译：热喷涂氧化铝基材料，例如氧化铝-二氧化钛（Al 2 O 3 -TiO 2 ）通常用作耐磨涂层在工业应用中。涂层的性能取决于喷涂过程，粉末形态和粉末的化学组成。在这项研究中，Al 2 O 3 和Al 2 O 3 -13TiO 的耐磨涂层将2 粉末进行等离子喷涂和高速氧燃料（HVOF）喷涂工艺。研究了熔融，粉碎，团聚和烧结的Al 2 O 3 -13TiO 2 粉末并与纯Al 2进行了比较 O 3 。测试了涂层的耐磨性，耐蚀性和抗气蚀性，以研究涂层结构对磨损行为的影响。将团聚和烧结的纳米结构Al 2 O 3 -13TiO 2 粉末用于等离子喷涂可改善涂层性能。在所有测试中，具有最高耐磨性的涂层是通过HVOF喷涂熔融和压碎的粉末制成的。
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