JPS62694A - Coated blade - Google Patents

Abstract

PURPOSE:To improve corrosion and erosion resistance by applying anti-corrosion coating to the first layer of the surface of an aluminum or aluminum alloy-made moving blade used in an exhaust gas ventilator, etc., and anti-erosion coating to its outer-most layer. CONSTITUTION:A 0.2mm-thick plasma flame coating of TiO2 powders is applied as anti-corrosion coating to the surface of an aluminum alloy blade 1 after surface preparation, and then, as anti-erosion coating, a 0.2mm-thick plasma flame coating of TiO2 powders blended with powders containing 20% Cr2O3 is applied to the third, fourth, and fifth layer with a TiO2-Cr2O3 ratio of 60:40, 40: and 20:80 respectively, and to the sixth layer with a 0.2mm-thick plasma flame coating of Cr2O3 to. Consequently, a coating layer 2 consisting of six layers is formed on the metal surface. The sixth layer on the outermost surface is effective for erosion resistance and the first layer for corrosion resistance, and the coatings between said two layers gradually change in proportion of the materials, to prevent peeling between the layers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a corrosion-resistant and erosion-resistant blade, and particularly to a rotor blade of an exhaust gas fan such as a boiler, such as an induced draft fan or a desulfurization fan.

[Conventional technology]

For example, a desulfurization ventilator installed in a part of a boiler exhaust system is required to withstand corrosion caused by strongly acidic exhaust gas and erosion caused by dust and mist. N1-based alloys can be cited as ones that meet the above conditions.
These are expensive and have many defects in manufacturing techniques such as forgeability and castability when enlarged, and there is no surface treatment technique that can provide both corrosion resistance and erosion resistance.

Previously, attempts have been made to apply coatings by painting or thermal spraying to the surfaces of inexpensive metal materials, but at present there is no coating material that has both corrosion resistance and erosion resistance.

[Problem that the invention seeks to solve]

The present invention solves the problems that could not be solved by the above-mentioned conventional methods, and aims to provide a lightweight rotor blade having a coating layer that has both corrosion resistance and corrosion resistance using an inexpensive material.

[Means for solving problems]

In the present invention, a coating material with excellent corrosion resistance and a coating material with excellent erosion resistance are thermally sprayed from the aluminum or aluminum alloy surface in a stepwise varying mixing ratio. 100% erosion-resistant coating material on the surface of the coating film, and in the middle, gradually changing the mixing ratio of the two to form a multilayer coating that combines corrosion resistance and erosion resistance. By doing so, the above objective is achieved.

That is, in the present invention, a corrosion-resistant material is located in contact with a wing base material made of aluminum or an aluminum alloy, and an erosion-resistant material is located on the outermost surface, and between them, out of the above-mentioned materials, the corrosion-resistant material is located in order toward the outer peripheral surface. This is a coated blade made of a multi-layer coating made of a material with an increased mixing ratio of erodible materials.

To give an example of the coating of the present invention, when applying six layers on the surface of a metal mold, for example, the blade surface is coated with a corrosion-resistant coating material as the first layer, and the second layer is coated with 80 layers of corrosion-resistant coating material. Double lotion resistant coating material 2
0% mixed material, similarly the third layer is 60chi:4 layer%, the fourth layer
The layers are 40%:60%, the 5th layer is 80%:20%, and the final 6th layer is 100% engineering-resistant p-joon coach ink material.
A coated blade, which is the object of the present invention, can be obtained by coating it to form a corrosion-resistant and erosion-resistant blade.

As a corrosion-resistant material, 'f'io,, 52chi00-
28 Chi No -17 Chi C! Tribaloy r-aoo (manufactured by Cabot Co., Ltd., USA) made of r-3chi S1 is used.

Or, O□wa+a are examples of erosion-resistant materials.

etc. can be used.

Any coating method can be used to produce the coating film, but among thermal spray coating materials, many ceramic materials have good erosion resistance, so thermal spray coating is advantageous.

〔Example〕

Figure 1 shows the case where the present invention is applied to an axial flow fan tool.
Shown in Figure 2. FIG. 1 is a sectional view when the present invention is applied to an axial flow fan tool, and FIG. 2 is an enlarged view of the arm portion of FIG. 1.

Aluminum alloy blades that have undergone surface treatment such as blasting and degreasing are first coated with T10 as a corrosion-resistant coating.
．． Plasma spray the powder to α2m thickness, then 1c 'i'
10. Or as an erosion-resistant coating on powder
The third layer is Tie, :Or, O@=60:40, and the fourth layer is T.
ie, : Or, 0. = 40: 60, 5th layer 'I' 10°: Or, 0. =20: 80, 6th
The layers were plasma sprayed with or and o, respectively (L2 mm thick). Six coating layers 2 were formed on the metal surface as described above, and the 46th layer of the surface layer was for erosion resistance, and the 46th layer was for corrosion resistance. The first layer is effective, and each intermediate layer also has corrosion resistance and erosion resistance, and the ratio of the coating material changes gradually, so the material properties are generally the same as in a multi-layered compound. It is possible to prevent peeling between the eyebrows due to changes in
+oo is also valid.

〔Effect of the invention〕

The first surface of the aluminum or aluminum alloy mold tool
By applying a corrosion-resistant coating to the layer, applying an erosion-resistant coating to the outermost layer, and changing the ratio of the two in stages in the intermediate layer, it is possible to obtain a ventilator tool that has both corrosion resistance and erosion resistance.

In addition, since the ratio of the intermediate layer is changed stepwise, the change in characteristics between each layer is small, and it is different from the conventional multilayer coating l1i.
It is possible to prevent delamination as seen in XK.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of an axial flow fan tool coated with the coating of the present invention, and Figure 2 is an enlarged view of the part in Figure 1, showing an example of six layers of multilayer coating. ) Meifuku agent Ryo Hagiwara − Sub-agent Atsuo Anzai

Claims (1)

[Claims] A corrosion-resistant material is located in contact with the wing base material made of aluminum or aluminum alloy, and an erosion-resistant material is located on the outermost peripheral surface, and between them, among the two materials,
A coated blade that is coated in multiple layers with a material in which the mixing ratio of erosion-resistant materials is gradually increased toward the outer peripheral surface.