JPH108231A - High speed flame spraying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high speed flame spraying method capable of performing easily thermal-spraying coating having wear resistance, seizing resistance and pressure resisting strength on the surface of the substrate to be thermal-sprayed at a high speed under the conditions of high speed rotation, high loads and nonlubrication. SOLUTION: High speed flame is generated using a combustion gas, and thermal spraying raw material powder is thermal-sprayed on the surface of the substrate to be thermal-sprayed using the above high speed flame to form coating on the surface of the substrate to be thermal-sprayed. In this case, as the thermal spraying raw material powder, a powdery mixture contg. 98 to 70vol.% Cu base bronze alloy powder of 77 to 89wt.% Cu, 4 to 11wt.% Sn, 4 to 11wt.% Pb, and the balance impurities and 2 to 30vol.% Cu base aluminum bronze alloy powder of 81 to 91wt.% Cu, 8 to 12wt.% Al, 1 to 6wt.% Fe, and the balance impurities is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a method in which a high-speed flame (flame) is generated by using a combustion gas, and the material to be sprayed is sprayed on the surface of a substrate to be sprayed by using the high-speed flame. The present invention relates to a high-speed flame spraying method for forming a coating on the surface of a base material, and in particular, lubricating a part or all of the surface of a swash plate for an air compressor pump made of aluminum alloy, cast iron or a steel-based alloy, It is suitably used for forming a film having excellent wear resistance.

[0002]

2. Description of the Related Art Conventionally, for example, a swash plate of an air compressor pump is configured to reciprocate a piston through a shoe which is in contact with a circumference of both sides of the swash plate by rotating, and accordingly, the swash plate is Is configured such that the shoe slides on the circumferential surface.

[0003] Usually, the swash plate is made of aluminum alloy, cast iron or steel-based alloy, and the shoe of the mating part to be slid is made of SUJ2. Occurs. Therefore, conventionally, the surface of the swash plate has been subjected to a treatment such as Sn plating or Teflon coating, and further application of MoS ₂ (lubricant).

[0004]

However, under the operating conditions in which the Sn-plated swash plate is in a non-lubricated state and is subjected to high load at high speed rotation, the amount of wear on the surface of the swash plate increases, and finally, And the shoe will burn. or,
In the case of performing Sn plating, it takes about 30 minutes to form a 10 μm plating film, and at the time of plating, it is necessary to mask a portion of the swash plate that does not need to be plated, and a masking material is applied and peeled off. It takes a lot of time, and there is a problem in workability.

[0005] Similarly, under the operating conditions in which the swash plate coated with Teflon is in a non-lubricated state and a high load is applied at a high speed, the amount of wear on the surface of the swash plate increases. Also, at the time of Teflon coating, as in the case of Sn plating, it is necessary to mask a coating unnecessary portion on the surface of the swash plate. For this reason, much time is required as described above. There is a problem in terms of gender.

At present, as far as the present inventors know, a shoe made of material SUJ2 exhibits abrasion resistance, seizure resistance and pressure resistance under high-speed rotation, high load and no lubrication conditions. For example, there is no suitable coating material for a swash plate made of aluminum alloy, cast iron or steel-based alloy.

[0007] Further, there is no surface modification method that can easily mask portions that do not require film formation by a wet method, can be quickly peeled off after film formation, and have a high film formation (film formation) speed.

Accordingly, an object of the present invention is to spray a coating having abrasion resistance, seizure resistance and pressure resistance on a surface of a substrate to be sprayed at a high speed and easily under a condition of high speed rotation, high load and no lubrication. And a high-speed flame spraying method.

Another object of the present invention is to provide a high-speed coating capable of producing a good coating with good adhesion without the possibility of falling off of the coating when machining the coating, and capable of producing a sound finish without burrs. An object of the present invention is to provide a flame spraying method.

Still another object of the present invention is to provide a swash plate for an air compressor pump made of an aluminum alloy, a cast iron or a steel alloy, which has excellent lubricity and wear resistance. It is an object of the present invention to provide a high-speed flame spraying method capable of forming a coated film.

[0011]

The above object is achieved by a high-speed flame spraying method according to the present invention. In summary, the present invention is a thermal spraying method in which a high-speed flame is generated by using a combustion gas, and a thermal spraying raw material powder is sprayed on the surface of the substrate to be sprayed by using the high-speed flame to form a coating on the surface of the substrate to be sprayed. In the method, as the thermal spraying raw material powder, Cu-based lead bronze alloy powder 98-70 comprising Cu = 77-89% by weight, Sn = 4-11% by weight, Pb = 4-11% by weight and the balance of impurities.
% By volume, Cu = 81 to 91% by weight, Al = 8 to 12% by weight, Fe = 1 to 6% by weight, and Cu
A high-speed flame spraying method using a mixed powder containing 2 to 30% by volume of a base aluminum bronze alloy powder. Preferably, the Cu-based lead bronze alloy powder and the Cu-based aluminum bronze alloy powder have a particle size of 10
６０60 μm. According to a preferred embodiment of the present invention, the substrate to be sprayed has a surface having a roughness of μRz =
Grit blasting is performed so as to obtain a thickness of 10 to 60, followed by heating to 50 to 150 ° C., followed by thermal spraying, and a coating having a thickness of 0.02 to 0.5 mm is formed on the surface of the substrate to be sprayed. Further, a flame speed of 1000 to 2500 m / sec using any mixed gas of oxygen / propane, oxygen / propylene, oxygen / natural gas, oxygen / ethylene, oxygen / kerosene or oxygen / hydrogen as the combustion gas,
A high-speed flame having a flame temperature of 2200 to 3000 ° C. is generated, and a thermal spraying distance is maintained at 170 to 350 mm to perform thermal spraying.

According to a preferred embodiment of the present invention,
The coating formed on the surface of the substrate to be sprayed has a surface roughness Ra
= 0.4-6.0S.

[0013] The thermal spraying method of the present invention comprises an aluminum alloy,
It is suitably used for thermal spraying on a swash plate for an air compressor pump made of cast iron or a steel alloy.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The high-speed flame spraying method according to the present invention will be described below in more detail with reference to the drawings.

FIG. 1 shows a schematic configuration of a thermal spraying apparatus (thermal spray gun) 1 for implementing the high-speed flame spraying method of the present invention. In brief, the spray gun 1 has a powder injection port 2 for introducing a spraying material powder at a central portion thereof, and a nozzle insert 3 and a shell around the same center from the inside to the outside. 4 and an air cap 5 are arranged to form a combustion gas passage 8 and compressed air passages 7 and 9.
Further, an air cap body 6 is provided outside the air cap 5.
Is arranged. Since the structure of such a spray gun 1 is well known to those skilled in the art, further detailed description will be omitted.

The material powder for thermal spraying is conveyed by an inert gas such as nitrogen gas, supplied to the powder input port 2, and ejected from the tip of the port into a combustion flame. On the other hand, the high-pressure combustion gas supplied from the combustion gas passage 8 burns at the outer periphery of the tip of the nozzle insert 3 and the shell 4. This combustion flame is wrapped in compressed air and is jetted from the air cap 5 at high temperature and high pressure to form a cylindrical ultra-high-speed flame (frame). The thermal spray raw material powder ejected from the tip of the port 2 by the ultrahigh-speed frame is heated at the center of the frame, melted, accelerated, and ejected at a high speed from the thermal spray gun 1. The sprayed raw material droplets are separated by a predetermined distance, that is, 170 to 3
It collides with a desired base material 100 arranged at 50 m, and a thermal spray coating 102 is formed on the surface.

Next, the thermal spraying raw material powder used in the present invention will be described.

In the present invention, as the thermal spraying raw material powder, a Cu-based lead bronze alloy containing lead, which has low seizure resistance and low aggressiveness to the partner and has self-lubricating properties, is used.
Cu-based aluminum bronze alloy is 2-3 in u-based lead bronze alloy
A mixed powder with 0% by volume added is used. By mixing a Cu-based aluminum bronze alloy with a Cu-based lead bronze alloy, it is possible to enhance the bonding strength of the film and obtain a film having high hardness.

More specifically, a Cu-based lead bronze alloy is made of C
u = 77-89% by weight, Sn = 4-11% by weight, Pb =
4 to 11% by weight and the balance of impurities. Examples of the impurities include Zn, Fe, Sb, P, Al, and Si.

In a Cu-based lead bronze alloy, 77% by weight of Cu
If it is less than 90%, brittleness occurs, whereas if it exceeds 89% by weight,
The effect of seizure resistance of other additive metals Sn and Pb is impaired. Therefore, the amount of Cu is 77-89% by weight, preferably 7%.
7 to 86% by weight. Sn is dissolved in Cu to improve hardness and tensile strength. If Sn exceeds 11% by weight, a brittle δ phase is likely to be formed, while if less than 4% by weight, toughness decreases. Therefore, the amount of Sn is preferably 4 to 11% by weight, preferably 6 to 9% by weight. Pb is a metal having a self-lubricating property, and has extremely excellent seizure resistance to a metal structure of martensite or carbide such as carbon steel. Pb hardly forms a solid solution in the Cu-Sn alloy, but exists between primary crystal grains. If Pb exceeds 11% by weight, the bonding strength of the thermal spray coating deteriorates, while if less than 4% by weight, the self-lubricating property is not sufficient. Therefore, the amount of Pb is 4
To 11% by weight, preferably 6 to 9% by weight.

The Cu-based aluminum bronze alloy is made of Cu
= 81-91% by weight, Al = 8-12% by weight, Fe = 1
-6% by weight and the balance of impurities. As impurities,
Usually, Ni, P, Si, Sb, etc. are mentioned.

In a Cu-based aluminum bronze alloy, if Cu is less than 81% by weight, brittleness occurs, and if it exceeds 91% by weight, the tensile strength is reduced.
% By weight, preferably 83 to 89% by weight. Al
Dissolves in Cu to improve hardness and tensile strength. However, if Al exceeds 12% by weight, a brittle phase is likely to be formed, while if less than 8% by weight, the hardness and tensile strength decrease. Therefore, the amount of Al is set to 8 to 12% by weight, preferably 8.5 to 11% by weight. Further, Fe combines with Al of the Cu—Al bronze alloy to form a κ phase (FeAl) intermetallic compound and affects mechanical properties. If Fe is less than 1% by weight, it does not contribute much to improvement in tensile strength, while if it exceeds 6% by weight, the κ phase increases and embrittles. Therefore, Fe
Is between 1 and 6% by weight, preferably between 2.5 and 6% by weight.

When a Cu-based aluminum bronze alloy is added to a Cu-based lead bronze alloy, the bonding strength of the coating increases in accordance with the amount of the addition. Therefore, it is preferable to use a mixed powder in which a Cu-based aluminum bronze alloy is added to a Cu-based lead bronze alloy at a volume ratio of 2% or more, rather than using a Cu-based lead bronze alloy alone. However, when the addition amount of the Cu-based aluminum bronze alloy exceeds 30% by volume,
The ratio of the amount of lead that is deposited in the Cu-based lead bronze alloy is reduced, and the seizure resistance is impaired. Therefore, under high load sliding conditions, the amount of Cu-based aluminum bronze alloy added is 2% by volume.
-30%, preferably 5-25%. Also, Cu
When the base aluminum bronze alloy is added, Pb is prevented from falling off from the coating when the coating is machined, and a sound-free finish without burrs becomes possible.

The above-mentioned C to be used in the present invention in the form of powder
The particle size of the u-based lead bronze alloy and the Cu-based aluminum bronze alloy is desirably 10 to 60 μm. In other words, when the particle size exceeds 60 μm, the particle temperature during thermal spraying decreases,
The amount of unmelted particles increases, which makes it difficult to form a dense film. On the other hand, if the particle size is less than 10 μm, the powder melts remarkably, and the coating contains a large amount of oxide and becomes brittle. In addition, the supply of the thermal spray raw material is reduced, and continuous thermal spraying becomes difficult. Therefore, as described above, the particle size is 10 to 60 μm
And preferably 10 to 45 μm.

The combustion gas used in the thermal spraying method of the present invention is preferably a mixed gas of oxygen / propane, oxygen / propylene, oxygen / natural gas, oxygen / ethylene, oxygen / kerosene or oxygen / hydrogen. Used for 1000 to 25
A frame speed of 00 m / s is obtained. As the flame speed increases, the speed of the sprayed particles also increases, and the particles dig into the substrate when colliding with the substrate to be sprayed, in other words, the anchoring effect is increased, so that the adhesion is improved. Further, when the speed of the particles is high, the thermal energy converted from the kinetic energy at the time of collision increases, and the outermost surface of the substrate is melted, so that the adhesion is improved. The frame speed required to ensure this adhesion is 1000 m / sec or more. On the other hand, the maximum speed of the frame is limited to 2500 m / sec due to the structure of the current thermal spray gun 1 having the above configuration. Further, in the combustion of the mixed gas as described above, the flame temperature is 2200 to 30.
00 ° C.

For example, when using a mixed gas of oxygen / propane as the combustion gas, the gas conditions during thermal spraying include:
Oxygen gas pressure 9-13Bar, flow rate 150-400L
Propane gas pressure 5-8B to PM (liter / min)
ar, flow rate of 50 to 120 LPM, compressed air of pressure 5 to
7 Bar, flow rate 250-700 LPM. Further, the flow ratio of propane gas to oxygen gas is set so that the combustion efficiency becomes optimal propane: oxygen = 1: 3.8 to 4.8 (when converted to a standard state). If the ratio of oxygen to propane is less than 3.8, the amount of unreacted propane increases and the cost increases. On the other hand, if the ratio of oxygen to propane exceeds 4.8, the amount of unreacted oxygen increases, and an oxide is formed on the sprayed coating, resulting in deterioration of the coating.

When using a mixed gas of oxygen / propylene as the combustion gas, the gas conditions during thermal spraying are as follows: oxygen gas at a pressure of 9 to 13 Bar and a flow rate of 150 to 380 LPM.
At a pressure of 5 to 8 Bar and a flow rate of 40 to 1
30 LPM, compressed air pressure 5-7 Bar, flow rate 25
0-700 LPM. The flow rate ratio of propylene gas to oxygen gas is determined by the optimum combustion efficiency of propylene: oxygen =
1: 3.5 to 4.5 (when converted to the standard state). The ratio of oxygen to propylene is 3.
If it is less than 5, the amount of unreacted propylene increases and the cost increases. On the other hand, if the ratio of oxygen to propylene exceeds 4.8, the amount of unreacted oxygen increases, and an oxide is formed on the sprayed coating, resulting in deterioration of the coating.

When using a mixed gas of oxygen / hydrogen as the combustion gas, the gas conditions during thermal spraying are as follows: oxygen gas at a pressure of 9 to 13 Bar, flow rate of 150 to 400 LPM, hydrogen gas at a pressure of 8 to 12 Bar, flow rate of 500 to 900 LPM.
And compressed air at a pressure of 5 to 7 Bar and a flow rate of 250 to 700.
Change to LPM. The flow rate ratio between oxygen gas and hydrogen gas is set so that the combustion efficiency is optimal: oxygen: hydrogen = 1: 2.0 to 2.6 (when converted to a standard state). If the ratio of hydrogen to oxygen is less than 2.0, the amount of unreacted oxygen increases, and oxides are generated in the thermal sprayed coating to cause deterioration of the coating,
If the ratio of hydrogen to oxygen exceeds 2.6, the amount of unreacted hydrogen increases and the cost increases.

In the present invention, the spraying distance during spraying (the distance between the spray gun 1 and the substrate to be sprayed 100) is 170 to 350 mm.
To The reason is that the powder accelerates below 170 mm,
If the powder is not heated and exceeds 350 mm, the temperature and speed of the powder once accelerated and heated are reduced, and the adhesion strength between the substrate and the powder particles and between the particles is decreased, which is not preferable.

The surface of the base material 100 to be sprayed must be a part of the surface of the base material to be sprayed before forming the coating, in order to enlarge the adhesion surface and maintain a high adhesion strength with the spray coating 102. Alternatively, it is necessary to remove all scales, perform cleaning beforehand, and perform a roughening treatment. The surface roughening treatment is preferably performed by grit blasting, in which grit such as SiC or alumina is sprayed onto the surface of the substrate to be sprayed at a pressure of about 0.5 MPa. The surface of the substrate after the surface roughening treatment preferably has irregularities with a surface roughness μRz = 10 to 60. These irregularities increase the contact area between the thermal spray coating and the substrate, and enhance the anchoring effect, that is, the mechanical coupling. Here, when the surface roughness is less than 10 μRz, the anchoring effect is insufficient, so that the adhesion strength is reduced. On the other hand, when the surface roughness is more than 60 μRz, the surface roughness of the coating becomes rough, and the finishing man-hour after the coating is reduced. More and less effective.

After such a blast treatment, it is preferable that the substrate to be sprayed is heated to 50 to 150 ° C. and then sprayed. Raising the temperature to 50 ° C. or higher is necessary to suppress the occurrence of dew condensation and increase the adhesion. Also, if the base material is 1
The temperature of 50 ° C. or lower is necessary in order to prevent thermal deformation of the base material and deterioration of the strength of the base material. The thickness of the coating is preferably 0.02 mm or more in order to obtain a wear resistance effect, and 0.5 mm or less in order to prevent peeling during thermal spraying or thermal stress during sliding. The surface roughness of the coating after thermal spraying is R
It is preferable to finish-process to a = 0.4 to 6.0S.
If Ra exceeds 6.0 S, the seizure resistance is impaired, and 0.4 S
If it is less, the cost is high.

Next, the present invention will be described in more detail with reference to examples.

Example 1 As a material for thermal spraying, C having the composition shown in Table 1 below was used.
A mixed powder consisting of 70% by volume of u-based lead bronze alloy powder and 30% by volume of Cu-based aluminum bronze alloy powder having the composition shown in Table 1 below was prepared and used.

As the substrate to be sprayed, a swash plate for an air compressor pump having an outer diameter of 100 mm, an inner diameter of 50 mm and a thickness of 6 mm was used. The material of the swash plate was SS41.

First, as a pretreatment, grit blasting was performed by spraying alumina grit (particle size # 20) on the surface of the swash plate at a pressure of 0.5 MPa. By this pretreatment, the surface roughness of the swash plate was μRz = 45 to 50.

Next, a pre-heat treatment was performed using the thermal spray gun 1 shown in FIG. At this time, the spraying gun 1 was operated under the following spraying conditions, but without supplying the spraying raw material powder, maintaining the spraying distance at 300 mm, injecting only the frame, and heating the swash plate to 150 ° C. Then, moisture, water and water vapor on the surface of the swash plate were removed.

Next, a coating was formed on the swash plate using the thermal spray gun 1 under the following thermal spraying conditions.

(Spraying conditions) Combustion gas Oxygen: pressure = 11 Bar, flow rate = 310 SLM Propane gas: pressure = 7 Bar, flow rate = 60 SLM Air: pressure = 6 Bar, flow rate = 360 SLM Here, “SLM” is a standard condition. It means the converted gas flow rate (liter / minute (LPM)). Flame temperature 2650 ° C Flame speed 1350 m / sec Spray distance 200 mm Spray material powder supply 70 g / min

[0039]

[Table 1]

The thickness of the sprayed coating on the surface of the swash plate obtained in this way is 0.25 mm, and the surface of this coating has a coating thickness of 0.12 mm by buffing after cutting. Finished with roughness Ra = 0.8-1.0S. No nest with a diameter of 0.01 mm or more was present on the finished surface.

Using a swash plate having a thermal spray coating produced as described above, a shoe made of SUJ2 is pressed against the surface of the swash plate at a surface pressure of 10 MPa, and the swash plate is rotated at a peripheral speed of 1 m / sec. And a single-piece friction and wear test was conducted.
As a comparative example, a single-piece friction wear test was performed under the same conditions using a conventional swash plate (plating thickness: 0.01 mm) with Sn plating on the surface. As a result, in the case of the conventional Sn-plated product, the maximum wear depth was increased to 0.01 mm or more, and SS41 of the base was exposed and seized, whereas the amount of wear on the surface of the swash plate manufactured by the present invention was increased. Was 5 μm, which proved to be excellent in wear resistance, seizure resistance and pressure resistance.

Examples 2 and 3 and Comparative Examples 1 to 5 As the thermal spraying raw material powder, C having the composition shown in Table 2 below was used.
A mixed powder containing a u-based lead bronze alloy (A) and a Cu-based aluminum bronze alloy (B) having the composition shown in Table 2 below was prepared and used.

The substrate to be sprayed has dimensions of 120 mm in outer diameter × 60 mm in inner diameter × 5.5 mm in thickness, a ring-shaped friction and wear test piece prepared in S15C, and a 30 mm in diameter.
X A disk-shaped pressure-resistant test piece having a size of 25 mm in height and manufactured by SS41 was used.

First, as a pretreatment, alumina grit (particle size # 30) was applied to the surfaces of these test pieces at a pressure of 0.4 MPa.
a, and grit blasting was performed. In this pretreatment, the surface roughness of each test piece was μRz = 25 to 35.
It became.

Next, a pre-heat treatment was performed using the thermal spray gun 1 shown in FIG. At this time, the spraying gun 1 was operated under the following spraying conditions, but without supplying the spraying raw material powder, maintaining the spraying distance at 300 mm, injecting only the frame, and heating the test piece to 150 ° C. do it,
Moisture, water and water vapor on the surface of each test piece were removed.

Next, using the thermal spray gun 1, a coating was formed on each test piece under the following thermal spraying conditions.

(Spraying conditions) Combustion gas Oxygen: pressure = 12 Bar, flow rate = 310 SLM Propylene gas: pressure = 6.5 Bar, flow rate = 75 SLM Air: pressure = 7 Bar, flow rate = 400 SLM Here, “SLM” is a standard. It means the gas flow rate (liter / minute (LPM)) converted to the state. Flame temperature 2700 ° C Flame speed 1500 m / sec Spray distance 250 mm Spray material powder supply 80 g / min

[0048]

[Table 2]

The thickness of the thermal spray coating on the surface of each of the test pieces obtained in this manner is set to 0. 0 for the ring-shaped test piece for friction and wear.
15 mm, 0.5 mm for a disk-shaped test piece for pressure resistance
Met. The coating surface of each of these test pieces was then subjected to buffing after cutting to give a coating thickness of 0.10 mm (a test piece for friction and wear) and 0.45 mm (a test piece for pressure resistance). The surface roughness was finished to Ra = 0.6 to 0.8S.

Using a disk-shaped pressure-resistant test piece having a spray-coated film prepared as described above, compression was performed by a universal testing machine, and the pressure-resistant pressure at which the spray-coated film and the base material were sheared off was measured. As a comparative example, a disk (plating thickness 0.01 mm) made of the same shape and size and material (SS41) with Sn plating on the surface was used. The result is shown in FIG.

Similarly, a ring-shaped friction / wear test piece having a sprayed coating prepared as described above was used, and a block made of SUJ2 was applied to the surface of the test piece at a surface pressure of 220 MPa.
By pressing with a, and rotating the test piece at a peripheral speed of 20 m / sec, the wear amount of the coating and the wear amount of the mating material (block), that is, the mating aggressiveness were measured. Also, as a comparative example,
Same shape dimensions and material with Sn plating on the surface (SS41)
The disk (plating thickness: 0.01 mm) prepared in the above was used. The result is shown in FIG.

Further, the shoe made of SUJ2 is applied with a surface pressure of 22.
The test piece was pressed at 0 MPa and the test piece was rotated at a peripheral speed of 20 m / sec, and the load until seizure was measured. As a comparative example,
Same shape dimensions and material with Sn plating on the surface (SS41)
The disk (plating thickness: 0.01 mm) prepared in the above was used. FIG. 4 shows the results.

From the results shown in FIGS. 2 to 4, a comprehensive evaluation is made in terms of pressure resistance, abrasion resistance, and seizure resistance. It was found to be superior to Comparative Examples 1 to 5 and the conventional product.

[0054]

As described above, according to the high-speed flame spraying method of the present invention, Cu = 77 to 8
9% by weight, Sn = 4 to 11% by weight, Pb = 4 to 11% by weight and the balance of Cu-based lead bronze alloy powder 98 to 98%
70% by volume, Cu = 81 to 91% by weight, Al = 8 to 1
(1) High-speed rotation and high load, since a mixed powder containing 2% by weight, Fe = 1 to 6% by weight and 2 to 30% by volume of a Cu-based aluminum bronze alloy powder composed of the balance of impurities is used. In a non-lubricated condition, a coating having abrasion resistance, seizure resistance and pressure resistance can be sprayed on the surface of the substrate to be sprayed at high speed and easily. (2) It is possible to produce a good coating with good adhesion, which does not fall off when the coating is machined and can be processed without burrs. (3) In particular, a coating excellent in lubricity and abrasion resistance can be formed on a part or the entire surface of a swash plate for an air compressor pump made of an aluminum alloy, cast iron, or a steel alloy. Many effects can be achieved.

[Brief description of the drawings]

FIG. 1 is a view showing a schematic configuration of a thermal spray gun for performing a high-speed flame spraying method of the present invention.

FIG. 2 is a view showing the pressure resistance of a sprayed coating obtained by the high-speed flame spraying method of the present invention, a comparative example, and a conventional product.

FIG. 3 is a view showing wear resistance of a thermal sprayed coating obtained by the high-speed flame spraying method of the present invention, a comparative example, and a conventional product.

FIG. 4 is a view showing a baking load of a thermal sprayed coating obtained by the high-speed flame spraying method of the present invention, a comparative example, and a conventional product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal spray gun 2 Powder input port 3 Nozzle insert 4 Shell 5 Air cap 6 Air cap body 7, 9 Compressed air passage 8 Combustion gas passage 100 Substrate to be sprayed 102 Thermal spray coating

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Hashimoto 11-19 Nibancho, Chiyoda-ku, Tokyo Sulzer Inside Metco Japan Co., Ltd. (72) Inventor Toshio Hotta 11-19 Nibancho, Chiyoda-ku, Tokyo Sulzer Meteco Japan Co., Ltd.

Claims (6)

[Claims] 1. A thermal spraying method for generating a high-speed flame using a combustion gas, spraying a thermal spray raw material powder on the surface of the substrate to be sprayed using the high-speed flame, and forming a coating on the surface of the substrate to be sprayed, Cu = 77 as the thermal spraying raw material powder
-89% by weight, Sn = 4-11% by weight, Pb = 4-11
Cu-based lead bronze alloy powder 9 consisting of wt% and the balance of impurities
8 to 70% by volume, Cu = 81 to 91% by weight, Al = 8
A high-speed flame spraying method, comprising using a mixed powder containing -12% by weight, Fe = 1-6% by weight, and 2-30% by volume of a Cu-based aluminum bronze alloy powder comprising the balance of impurities. 2. The Cu-based lead bronze alloy powder and the Cu
The particle size of the base aluminum bronze alloy powder is 10 to 60 μm
2. The high-speed flame spraying method according to claim 1, wherein 3. The substrate to be sprayed has a surface having a roughness of μ.
Perform grit blasting so that Rz = 10 to 60, then heat to 50 to 150 ° C., perform thermal spraying, and apply a thickness of 0.02 to 0.5 m on the surface of the substrate to be sprayed.
The high-speed flame spraying method according to claim 1 or 2, wherein a coating of m is formed. 4. The combustion gas includes oxygen / propane,
Oxygen / propylene, oxygen / natural gas, oxygen / ethylene,
Using a mixed gas of either oxygen / kerosene or oxygen / hydrogen, a high-speed flame with a flame speed of 1000 to 2500 m / sec and a flame temperature of 2200 to 3000 ° C. is generated. 4. The high-speed flame spraying method according to claim 1, 2 or 3, wherein: 5. The high-speed flame spraying method according to claim 1, wherein the coating formed on the surface of the substrate to be sprayed is finished to have a surface roughness Ra = 0.4 to 6.0S. 6. The sprayed substrate is an aluminum alloy,
The high-speed flame spraying method according to any one of claims 1 to 5, which is a swash plate for an air compressor pump made of cast iron or a steel alloy.