首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Comparison of slurry and dry erosion behaviour of some HVOF thermal sprayed coatings
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Comparison of slurry and dry erosion behaviour of some HVOF thermal sprayed coatings

机译:某些HVOF热喷涂涂料的浆液和干腐蚀行为的比较。

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摘要

The performance of 10 high velocity oxy-fuel (HVOF) sprayed coatings has been evaluated under both dry particle and slurry erosion conditions at 90° and 20° impingement angles. The coatings were six WC cermets with Co- or Ni-based matrices, a Cr__2-NiCr composite and three metallic alloys. Slurry jet erosion experiments were carried out using a 9 wt.% alumina/water slurry with 35 and 200 µm angular alumina particles, at an impingement velocity of 15 m/s and flow rate of 18 l/min in a re-circulating loop apparatus. Dry erosion was effected in a once-through mode with 50 µm diameter alumina particles at a velocity of 84 m/s and feed rate of 2 g/min. Dry erosion rates three orders of magnitude greater than slurry erosion rates were due mainly to the differences in actual particle-target impact velocities. Coating composition, microstructural integrity and hardness were the major determinants of relative erosion resistance in all tests, with matrix corrosion resistance influencing the surface damage resistance of cermets in longer duration aqueous slurry tests.
机译:已经在90°和20°的冲击角下,在干粉和泥浆侵蚀条件下评估了10种高速氧-燃料(HVOF)喷涂涂料的性能。涂层是六种带有Co或Ni基基体的WC金属陶瓷,Cr__2-NiCr复合材料和三种金属合金。在循环回路设备中,以15 m / s的撞击速度和18 l / min的流速,使用具有35和200 µm角氧化铝颗粒的9 wt。%氧化铝/水浆料进行浆料喷射侵蚀实验。 。用直径为50 µm的氧化铝颗粒以84 m / s的速度和2 g / min的进料速度以一次通过模式进行干法腐蚀。干腐蚀速率比泥浆腐蚀速率大三个数量级,这主要是由于实际的颗粒目标撞击速度不同所致。在所有测试中,涂层组成,微观结构完整性和硬度是相对耐蚀性的主要决定因素,而在较长时间的水浆料测试中,耐基体腐蚀性能会影响金属陶瓷的抗表面损伤性。

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