Impeller is usually made of high temperature alloy, often used in aerospace, energy, industrial engines.
Abrasion prevention
The wear of fan impeller is related to abrasive composition, particle size, concentration, shape, impact velocity, impact Angle, gas chemical composition, property, temperature and humidity. The inhomogeneity of the gas flow in the impeller accelerates the wear. As the measures to prevent impeller wear: one is to reduce the dust and corrosive gas into the fan, so it is necessary to transform the fan operation system; The other is to try to make the local wear tends to uniform wear, which needs to improve the wear resistance of the impeller. If the wear resistance of the impeller is improved, high hardness and good wear resistance materials can be used. This will not only bring difficulties to the impeller manufacturing process, but also unreasonable from the economic point of view. Therefore, it is an economical and reasonable solution to improve the surface quality of the fan impeller, surfacing or spray welding (spraying) wear-resistant layer of the impeller and adding a layer of lining on the blade in order to achieve wear-resistant.
Apply anti-wear paint
The main anti - wear coatings include resin anticorrosive wear-resisting coatings, rubber anticorrosive wear-resisting coatings, quartz and water glass and ceramic anticorrosive wear-resisting materials.
Wear-resistant compound 890 is a kind of ceramic composite material used to repair and protect the surface of abraded metal. This compound has good abrasion resistance and adhesion with the base material. However, the coating thickness of 890 wear-resistant compound must reach 6mm or thicker, which is not suitable for some narrow runner or rotor with strict starting requirements. Similarly, there are also such problems as adding a layer of wear-resistant liner on the blade to solve the wear of the fan impeller.
Surfacing of blade surface
Surface surfacing is to select certain surfacing electrode (or wire), manual arc (or automatic welding) surfacing in the parts of the blade easy to wear, to improve the surface quality of the blade, in order to protect the blade and improve the life of the blade. D217, D237, D317B, D707 and D717 are generally selected for blade surfacing electrode. The surfacing metals of D217 and D237 belong to horse-body steel, which have certain anti-wear ability, but the surfacing crack tendency is larger. D317B surfacing material is a kind of surfacing alloy composed of a large number of tungsten carbide (WC) particles distributed on the metal matrix. Due to the high melting point and hardness of WC, the metal in the weld path has high hardness and impact resistance, and the hardness HRC≥60, and the crack tendency of surfacing metal is small.
Surface spray welding
Spray welding process is a process in which the powder of self-fusing alloy is sprayed and fused on the workpiece surface by a heat source to form a dense spray welding layer. The wear-resistant spray welding powders are basically nickel-based spray welding powders of Ni-Cr-B-Si series. The basic structure of the spray welding layer is Ni-Cr-Fe solid solution, and there are a lot of boron compounds and tungsten carbide. These WC particles are evenly distributed in the Ni-based spray layer. These particles are uniform and discontinuous, but can form a skeleton with hardness up to HRC70. The Ni-based material is filled in the skeleton and can withstand high abrasive wear when subjected to abrasive erosion. The surface hardness of spray welding is HRC55 ~ 70, and its basic composition is Ni60%+WC35%.
Artison is a supplier of aerospace components; Products include impeller, turbine, combustion chamber, fastener, etc.
If you have any questions or needs, please contact us. Here is our contact information:
Price Inquiry：sales.lily@superalloyparts.com
Technical Support：eng.daisy@superalloyparts.com
Quality Control：qc.jason@superalloyparts.com