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Suspension High Velocity Oxy-Fuel (SHVOF)-sprayed alumina coatings: microstructure, nanoindentation and wear

机译：悬浮高速氧燃料（SHVOF）喷涂氧化铝涂层：微观结构，纳米压痕和磨损

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Suspension High Velocity Oxy Fuel Spraying (SHVOF) can be used to produce thermally sprayed coatings from powdered feedstocks too small to be processed by mechanical feeders, allowing formation of nanostructured coatings with improved density and mechanical properties. Here, alumina coatings were produced from sub-micron sized feedstock in aqueous suspension, using two flame combustion parameters yielding contrasting microstructures. Both coatings were tested in dry sliding wear conditions with an alumina counterbody. The coating processed with high combustion power of 101 kW contained 74 wt% amorphous phase and 26 wt% crystalline phase (95 wt% gamma and 3 wt% alpha alumina) while the 72 kW coating contained lower 58 wt% amorphous phase and 42 wt% crystalline phases (73 wt% was alpha and 26 wt % gamma). The 101 kW coating had a dry sliding specific wear rate between 4-4.5 x 10-5 mm3/Nm, 2 orders of magnitude higher than the 72 kW coating wear rate of 2-4.2 x 10-7 mm3/Nm. A severe wear regime dominated by brittle fracture and grain pull out of the coating was responsible for the wear of the 101 kW coating, explained by mean fracture toughness three times lower than the 72 kW coating, owing to the almost complete absence of alpha alumina.
机译：悬浮液高速含氧燃料喷涂（SHVOF）可用于从粉状原料生产热喷涂涂层，而粉状原料太小而无法由机械给料机处理，从而可以形成密度和机械性能得到改善的纳米结构涂层。在此，使用两个火焰燃烧参数从水悬浮液中的亚微米级原料生产氧化铝涂层，从而形成对比鲜明的微观结构。两种涂层均在干燥滑动条件下使用氧化铝配体进行测试。用101 kW的高燃烧功率处理的涂层包含74 wt％的非晶相和26 wt％的结晶相（95 wt％的γ和3 wt％的α氧化铝），而72 kW的涂层包含较低的58 wt％的非晶相和42 wt％结晶相（73重量％是α，26重量％是γ）。 101 kW涂层的干滑比磨损率在4-4.5 x 10-5 mm3 / Nm之间，比72 kW涂层的2-4.2 x 10-7 mm3 / Nm高2个数量级。 101 kW涂层的磨损主要由脆性断裂和拉出涂层引起的严重磨损引起，这是由于几乎完全没有α氧化铝造成的平均断裂韧性比72 kW涂层低三倍。

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