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由于新的喷涂材料不断发展,涂层日趋精密,使这个工艺得到日益广泛的应用。飞机工业使用热喷涂涂层的零件也不断增加。现已可以选用多种性能与使用要求相匹配的涂层。 精密件的理想表面涂层应有下列特点: 1.用现有方法操作及评定方便; 2.对基体强度无显著影响; 3.能提高零件寿命; 4.涂层容易除去,除去后也不会过分减少基体的尺寸。 经过长期的努力,热喷涂涂层能符合上面这几项要求。本文将强调在运输机上使用喷涂涂层有关的一些问题。 一、起落架零件上使用的涂层 一些起落架零件如主轴、内汽缸、牵引拉杆、支撑及制动转矩等是由4340M或H11型等低合金钢热处理后使用,其表面一般镀铬以防止微振磨损,铬层被磨损后,基体就要受到微振磨损及锈蚀两方面的影响。
As the new spray materials continue to evolve, the coatings become more sophisticated, making the process an increasingly widespread application. Aircraft industry using thermal spray coating parts also continue to increase. Now available in a variety of performance and application requirements to match the coating. The ideal surface coating precision parts should have the following characteristics: 1. With the existing method of operation and assessment of convenience; 2. No significant impact on the strength of the substrate; 3. Can improve the life of parts; 4. The coating is easy to remove, remove Will reduce the size of the substrate too much. After long-term efforts, thermal spray coating can meet the above requirements. This article will highlight some of the issues related to the use of spray coatings on transport aircraft. First, landing gear parts on the coating Some landing gear parts such as the spindle, the cylinder, traction rod, support and braking torque is 4340M or H11 type low alloy steel after heat treatment, the surface is generally chrome to prevent Micro-vibration wear, chromium layer is worn, the substrate will be subject to fretting wear and corrosion both.