JP4216453B2 - Manufacturing method of coating member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating member suitable for densifying a sprayed coating and improving the strength of the coating, and a method for producing the same.
[0002]
[Prior art]
Coatings are widely used to impart special properties to the surface of a substrate made of a metallic material. In particular, a method of forming a film by a thermal spraying method is used in a wide range of fields. In this film forming method, the particulate material is ejected from the thermal sprayer, sprayed onto the surface of the base material, and applied over multiple layers.
[0003]
The ejected particulate material is heated by a high-temperature flame or arc in a thermal sprayer, and adheres to the surface of the substrate in a semi-molten state. The particle size is relatively large, about 30 μm. In general, gaps called pores are formed between particles forming a layer, and the formation of the pores makes the film porous and brittle.
[0004]
[Problems to be solved by the invention]
The coating formed by the thermal spraying method is unavoidable to be porous and brittle due to pores generated during construction. The properties of such a coating do not change essentially even if, for example, the processing conditions are variously changed in the thermal spraying process.
[0005]
The reason why the coating is applied to the surface of the base material is, for example, to impart desirable properties such as heat resistance and abrasion resistance to the member. When used in the original, the porous film does not have a sufficient strength compared to the base material. For example, if the allowable stress is exceeded by the action of an external force, part of the film peels off. Problems such as end up occur.
[0006]
Once such a problem occurs, it is necessary to replace the coating member, and the device in which the coating member is incorporated must be stopped from operation, resulting in a large influence on other devices. In addition, it is wasteful to replace the entire coating member due to damage to the coating alone, and in particular, it is required to increase the strength of the coating itself so as not to cause damage during service.
[0007]
It is an object of the present invention to provide a coating member and a method for producing the same, in which pores generated during the formation of a coating by thermal spraying are drastically reduced and the strength of the coating is remarkably increased.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is 1 selected from any one metal selected from Al, Fe, Cu, Ni, Mg or an alloy group mainly composed of at least one of these metals Forming a substrate made of seeds into a predetermined shape, and at least one metal selected from Cu, Al, Ag, Ti, Fe, W or at least one of these metals on the surface of the substrate Forming a film composed of one kind selected from an alloy group as a main component by thermal spraying with a thickness in the range of 1 mm to 10 mm, and stretching the film part of the base material with a pulling machine, and applying tensile stress to the material And a step of densifying by colliding a sphere having a diameter of 10 mm or less made of Fe or an alloy containing Fe as a main component against the coating surface of the substrate. .
[0009]
In such a coating member, pores generated by the formation of the film by thermal spraying are remarkably reduced by the densification treatment, or most of the pores disappear by combining with the desirable treatment conditions described later, and the strength of the coating is remarkably improved. be able to.
[0012]
In the base material forming process, the base material is formed by machining, pressing, roll processing, spinning, or other processing. In the film forming step, a film is formed on the surface of the substrate by any one of gas spraying, arc spraying, and plasma spraying. In the densification treatment step, a solid made of a metal or a non-metallic material is collided with the coating surface of the substrate.
[0018]
In addition, by carrying out a process of applying tensile stress to the film of the base material as an additional process after the film formation process , the bending strength is significantly increased compared to that which is not subjected to treatment, compared with that which is processed in a normal state. However, the bending strength can be further increased.
[0020]
Furthermore , by forming the film thickness in the film forming step in the range of 1 mm to 10 mm, the effect of the densification treatment is not lost, and the effect of the present invention can be obtained to the maximum.
[0022]
In addition , by colliding solids during or after heating the substrate and film in the densification treatment step, the bending strength is much increased compared to those not subjected to treatment, even compared to those treated at room temperature, Furthermore, the bending strength can be further increased.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Example 1
In FIG. 1A, a substrate 1 was formed from an Al material, and then a coating 2 made of Cu was formed on the surface of the substrate 1 by thermal spraying. In the thermal spraying, a uniform film thickness was maintained by plasma spraying. Next, the iron ball was accelerated using a medium, and was uniformly collided with the surface of the film 2. The state of the film 2 of the obtained coating member is shown in FIG.
[0028]
After forming the film 2 for comparison, a sample (untreated sample) in which nothing was applied to the film 2 was also produced. The volume ratio of pores in the film was determined for these coated members and untreated samples, and the obtained coated members and samples were accurately evaluated.
[0029]
FIG. 3 shows the result of comparing the bending strength ratio. It was confirmed that the bending strength increased several times or more in the coating member of Example 1 compared to the untreated sample corresponding to the conventional coating member.
[0030]
Further, FIG. 4 shows the result of comparing the bending strength ratio based on the pore volume ratio. It was confirmed that the bending strength can be improved about 5 times in the coating member of Example 1 having a volume ratio of 10% or less as compared with an untreated sample having a high volume ratio of pores in the film.
[0031]
(Example 2)
A base material 1 was formed from an alloy material containing Al as a main component, and then a coating 2 made of an alloy containing Cu as a main component was formed on the surface of the base material 1 by thermal spraying. In this thermal spraying, plasma spraying was used to change the film thickness from 1 mm to 20 m. Next, the iron ball was accelerated using a medium, and was uniformly collided with the surface of the film 2. For each coating member, the volume ratio of pores in the film 2 was determined, and these coating members were accurately evaluated.
[0032]
FIG. 5 shows a comparison result of the volume ratio of pores in the film. It was found that when the thickness of the film 2 was about 11 mm or more, the volume ratio of the pores rapidly increased and the effect of the densification treatment was lost. On the other hand, it was found that when the thickness of the film 2 is in the range of about 1 mm to about 10 mm, the volume ratio of the pores is small, and the effect of the densification treatment can be maximized. That is, it was confirmed that the thickness of the film 2 is preferably in the range of about 1 mm to about 10 mm.
[0033]
(Example 3)
A base material 1 was formed from an alloy material containing Al as a main component, and then a coating 2 made of an alloy containing Cu as a main component was formed on the surface of the base material 1 by thermal spraying. In this thermal spraying, plasma spraying was used to maintain a uniform film thickness. Next, the iron ball was accelerated using a medium in a state where both the substrate 1 and the coating 2 were heated to a certain temperature, and uniformly collided with the surface of the coating 2.
[0034]
After forming the film 2 for comparison, a sample (untreated sample) in which nothing was applied to the film 2 was also produced. The volume ratio of the pores in the film 2 was obtained for the obtained coating member and untreated sample, and these coating member and sample were accurately evaluated.
[0035]
FIG. 6 shows the result of comparing the bending strength ratio. It was confirmed that the bending strength of the coating member of Example 3 increased by 10 times or more compared to the untreated sample, and even higher than that of Example 1 treated at room temperature.
[0036]
(Example 4)
A base material 1 was formed from an alloy material containing Al as a main component, and then a coating 2 made of an alloy containing Cu as a main component was formed on the surface of the base material 1 by thermal spraying. In this thermal spraying, plasma spraying was used to maintain a uniform film thickness. Next, the iron ball was accelerated using a medium in a state where the periphery of the substrate 1 and the film 2 was filled with argon gas, and was uniformly collided with the surface of the film 2.
[0037]
After forming the film 2 for comparison, a sample (untreated sample) in which nothing was applied to the film 2 was also produced. The volume ratio of the pores in the film 2 was obtained for the obtained coating member and untreated sample, and these coating member and sample were accurately evaluated.
[0038]
FIG. 7 shows a result of comparison with respect to the bending strength ratio. It was confirmed that the bending strength of the coating member of Example 4 was increased nearly 10 times compared to the untreated sample, and was even higher than that of the coating member of Example 1 processed in the normal state.
[0039]
(Example 5)
A base material 1 was formed from an alloy material containing Al as a main component, and then a coating 2 made of an alloy containing Cu as a main component was formed on the surface of the base material 1 by thermal spraying. In this thermal spraying, plasma spraying was used to maintain a uniform film thickness. Next, the film 2 portion of the substrate 1 was stretched with a pulling machine, and a tensile stress was applied to the material. Next, the iron ball was accelerated using a medium, and was uniformly collided with the surface of the film 2.
[0040]
After forming the film 2 for comparison, a sample (untreated sample) in which nothing was applied to the film 2 was also produced. The volume ratio of the pores in the film 2 was obtained for the obtained coating member and untreated sample, and these coating member and sample were accurately evaluated.
[0041]
FIG. 8 shows a result of comparison with respect to the bending strength ratio. It was confirmed that the bending strength of the coating member of Example 5 increased by 10 times or more compared to the untreated sample, and even higher than that of the coating member of Example 1 processed in the normal state.
[0042]
(Example 6)
In FIG. 9 (a), the contact member 3 is formed from a material of an alloy containing Al as a main component, and then the end surface of the contact member 3 and the surface from the end surface to the inside are made of an alloy containing Cu as a main component by thermal spraying. Film 4 was formed. In this thermal spraying, plasma spraying was used to maintain a uniform film thickness. Next, the iron ball was accelerated using a medium, and uniformly collided with the surface of the film 4.
[0043]
Also in this contact member 3, it was confirmed that desirable strength was obtained for the film 4 by the densification treatment. In addition, it was confirmed that the rod 4 contact member 5 as shown in FIG.
[0044]
【The invention's effect】
According to the present invention, since the solid is collided with the surface of the coating formed on the surface of the substrate by thermal spraying and the coating is densified, the strength of the coating itself can be remarkably increased, and the coating member It is possible to stably use a device that incorporates a long-term use.
[Brief description of the drawings]
1A and 1B show a coating member according to the present invention, in which FIG. 1A is a cross-sectional view showing a base material on which a film is formed, and FIG. 1B is a cross-sectional view showing a base material subjected to densification treatment.
FIG. 2 is a process diagram showing a method for producing a coating member according to the present invention.
FIG. 3 is a diagram showing a bending strength ratio based on comparison with an untreated sample of a coating member of the present invention.
FIG. 4 is a graph showing the relationship between the volume ratio of pores and the bending strength ratio according to the present invention.
FIG. 5 is a graph showing the relationship between the thickness of the film according to the present invention and the volume ratio of pores.
FIG. 6 is a diagram showing a bending strength ratio based on a comparison with an untreated sample of a coating member of the present invention.
FIG. 7 is a diagram showing a bending strength ratio based on comparison with an untreated sample of the coating member of the present invention.
FIG. 8 is a diagram showing a bending strength ratio based on comparison with an untreated sample of the coating member of the present invention.
9A and 9B show an application example of a coating member according to the present invention, in which FIG. 9A is a cross-sectional view showing a main part of a contact member of a power circuit breaker, and FIG. 9B shows a main part of a contact member of a switch; Sectional drawing.
[Explanation of symbols]
1, 3, 5 ... base material, 2, 4 ... coating

Claims (1)

A base material made of any one metal selected from Al, Fe, Cu, Ni, and Mg or an alloy group mainly composed of at least one of these metals is formed into a predetermined shape. Process ,
The surface of the base material is composed of any one metal selected from Cu, Al, Ag, Ti, Fe, and W, or one selected from an alloy group containing at least one of these metals as a main component. Forming a coating with a thickness of 1 mm to 10 mm by thermal spraying ;
Stretching the film portion of the substrate with a pulling machine and applying a tensile stress to the material;
A step of densifying a sphere having a diameter of 10 mm or less made of Fe or an alloy containing Fe as a main component with respect to the coating surface of the substrate;
The manufacturing method of the coating member characterized by including.

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