KR20070067802A - Spaying powder composition for swash plate of car air conditioning system and method for preparing of swash plate for car air conditioning system using it - Google Patents

Abstract

A spaying powder composition comprising a Cu-Sn based powder, a graphite powder, a Cu-Si based powder, Cu, Fe and impurities for a swash plate of an automotive air conditioner, which can improve low friction characteristics and burning characteristics by forming a coating layer capable of improving lubricity even without using lead that is very harmful to the environment, and a method of manufacturing a swash plate for an automotive air conditioner using the same are provided. A spaying powder composition for a swash plate of an automotive air conditioner comprises: (a) 65 to 95 wt.% of a Cu-Sn based powder; (b) 1 to 10 wt.% of a graphite powder; (c) 5 to 15 wt.% of a Cu-Si based powder; and (d) the balance of Cu, Fe and impurities. The Cu-Sn based powder, the graphite powder, and the Cu-Si based powder are prepared through the steps of: (a) weighing the components correspondingly to standard amounts of respective components; (b) melting the respective weighed components; (c) simultaneously tapping the molten components, and injecting a high pressure nitrogen gas into the molten components at a high speed to cool and atomize the molten components; and (d) sorting the respective atomized components per particle sizes. The tapping process is performed at a temperature that is about 80 deg.C higher than a melting point of alloy elements(the Cu-Sn based powder, the graphite powder, and the Cu-Si based powder).

Description

SPRAYING POWDER COMPOSITION FOR SWASH PLATE OF CAR AIR CONDITIONING SYSTEM AND METHOD FOR PREPARING OF SWASH PLATE FOR CAR AIR CONDITIONING SYSTEM USING IT}

The present invention relates to a spray powder composition for automobile air conditioner swash plate and a method for manufacturing a swash plate for automobile air conditioner using the same, and more particularly, to form a coating layer that can improve the lubricity without using lead that is very harmful to the environment. And to improve the adhesion characteristics, wear resistance, slip resistance, and service life significantly improved, and relates to an environmentally friendly thermal spraying spray composition for a car air conditioner swash plate and a method for manufacturing a swash plate for a car air conditioner using the same.

In general, the swash plate for the automotive air conditioner is used under high load and high speed rotation, and high wear resistance is required along with the low friction property of the material.

Recently, in accordance with the trend of lighter weight and higher functionality of automobiles, the situation is gradually changing to a variable swash plate, which is much better in cooling efficiency than a fixed swash plate used in the past.

This variable swash plate is characterized by a high load, high speed rotation compared to the conventional fixed type requires a significantly improved low friction and wear resistance compared to the fixed swash plate composed of the Al-Si casting structure of the model.

In accordance with the requirements of the variable swash plate as described above, U.S. Patent No. 5,875,702 describes a coating layer of swash plate by mixing alumina, silica and the like having excellent abrasion resistance on a base of Sn, Al, etc. centering on a low friction material Pb. U.S. Patent No. 6,123,009 describes coating of low friction materials such as MoS ₂ on Cu + Sn bases with epoxy resins, and U.S. Patent No. 6,344,280 uses Al bases to improve light weight and high wear resistance properties. after the addition of Si in a large amount (60%), MoS _2, and adding a low-friction material such as carbon to the substrate with respect to improving the low friction-wear characteristics of the swash plate.

In addition, Korean Patent Application No. 2000-99642 prepared a swash plate by forming a thermal spray coating layer by mixing Cu-Pb-Sn powder and Al-Si powder, wherein Pb of Su-Pb-Sn powder was used as a low friction material. In order to improve the wear resistance of the swash plate by alloying a large amount of Si on the Al-Si alloy powder, high hardness properties of Si were used.

However, the prior arts described above were inadequate to improve the anti-sintering property in forming the thermal spray coating layer on the variable swash plate, and thus, inevitably, a large amount (10 to 16%) of lead (Pb) had to be used. As it is well known, it is very harmful to the environment and its use is strictly regulated around the world, so there is an urgent need for a new alternative to solve it.

In order to solve the problems of the prior art as described above, the present invention forms a coating layer that can improve the lubricity without using lead that is very harmful to the environment, the thermal spraying powder for automobile air conditioner swash plate which can improve the low friction characteristics and sintering characteristics An object of the present invention is to provide a composition and a method of manufacturing a swash plate for an automobile air conditioner using the same.

Another object of the present invention is to improve the low friction characteristics, significantly improved wear resistance, slip resistance, and service life, and does not use lead environmentally friendly thermal spraying spray composition for a car air conditioner swash plate and a method of manufacturing a swash plate for a car air conditioner using the same To provide.

In order to achieve the above object, the present invention in the thermal spraying powder composition for swash plate of automobile,

a) 65-95 wt.% Cu—Sn based powder;

b) 1 to 10% by weight graphite powder;

c) 5 to 15% by weight of Cu-Si-based powder; And

d) residual Cu, Fe, and impurities

It provides a spray powder composition for automobile air conditioner swash plate comprising a.

In another aspect, the present invention provides a method of manufacturing a swash plate for a car air conditioner comprising the step of forming a coating layer by thermal spraying the thermal spraying powder composition on the swash plate of the car air conditioner.

Hereinafter, the present invention will be described in detail.

The present inventors have studied the composition of the components that can achieve improved adhesion, wear resistance, and slip resistance of the coating layer to be formed on the swash plate, it was confirmed that Cu-Sn-based, Cu-Si-based spray powder is suitable for this , As a result of adding a certain amount of graphite powder to the above, it was confirmed that the characteristics are excellent, to complete the present invention based on this.

The thermal spraying powder composition for automobile air conditioner swash plate of the present invention is 65 to 95% by weight of Cu-Sn-based powder, 1 to 10% by weight of graphite powder, 5 to 15% by weight of Cu-Si-based powder, and residual amounts of Cu, Fe, and impurities Characterized in that it comprises a.

The Cu-Sn-based powder, graphite powder, and Cu-Si-based powder used in the present invention may be weighed to correspond to a reference amount of each component; Dissolving each component after completion of basis weight; Cooling and micronizing by injecting a high pressure nitrogen gas at a high speed at the same time as tapping after the melting; And through the step of classifying the finely divided components can be obtained a final Cu-Sn-based powder, graphite powder, and Cu-Si-based powder.

First, the Cu-Sn-based powder, graphite powder, and Cu-Si-based powder are basis weights so that each component corresponds to a predetermined reference amount, wherein the basis weight may be performed using a conventional basis weight machine.

For example, when 100 g is used for the composition, the Cu-Sn system is weighed at 100 g, and the Cu-Si system is weighed at 100 g. Among them, the ratio of Cu: Sn in the Cu-Sn system is The ratio refers to the basis weight so that the entire Cu-Sn system is 100 regardless of any ratio, depending on the desired characteristics (for example, Cu = 70, Cn = 30, such that the Cu-Sn system is 100). The same applies to the remaining Cu-Si type.

When the basis weight of each component is completed as above, it is dissolved for each component. At this time, the melting is preferably carried out in a melting furnace, preferably induction furnace.

At the same time as the melting and tapping process, high-pressure nitrogen gas is sprayed at high speed to cool and micronize each component.

The tapping process is preferably carried out by maintaining a temperature higher than the desired temperature in order to ensure the fluidity of the molten metal is melted, in particular the melting temperature of alloying elements (Cu-Sn-based powder, graphite powder, and Cu-Si-based powder) It is preferable to tap the water at a temperature higher than about 80 ° C.

High-speed nitrogen gas high-speed injection is carried out at the same time as the tapping process serves to cool the molten metal to be tapped and at the same time to finely differentiate.

Each of the micronized components as described above are mixed in various particle sizes, and a particle size classification process is performed to separate coarse particles therefrom. At this time, the particle size classification can be carried out using a conventional constitution.

When the particle size classification is completed as described above, it is possible to obtain a Cu-Sn-based powder of 75 µm or less, a graphite powder of 20 µm or less, and a Cu-Si-based powder of 75 µm or less.

Cu-Sn-based powder, graphite powder, and Cu-Si-based powder obtained through the above process are 65 to 95% by weight, 1 to 10% by weight, and 5 to 15% by weight, respectively, of the thermal spray powder composition of the present invention. It is included in, in addition to the remaining amount of Cu, Fe, and impurities further.

When the Cu-Sn-based powder is included in the thermal spraying powder composition by less than 65% by weight, there is a problem in that brittleness increases in the coating layer due to a large amount of graphite and high hardness Cu-Si powder, and when it exceeds 95% by weight On the contrary, there is a problem in that the ductility of the coating layer is increased and the wear resistance of the coating layer is lowered.

When the graphite powder is included in less than 1% by weight, there is a problem that there is little lubricating effect on the coating layer. When the graphite powder exceeds 10% by weight, there is a segmentation part in the graphite, and the tungsten sulfide is concentrated in this part. There is a problem in that dropping to lower the durability life of the coating layer.

In addition, when the Cu-Si-based powder is included in less than 5% by weight, there is a problem that the wear resistance of the coating layer is lowered, and when the Cu-Si-based powder exceeds 15% by weight, brittleness is increased in the coating layer to cause the peeling phenomenon of the coating layer. There is this.

The thermal spraying composition for swash plate of the air conditioner of the present invention comprising the above composition of the composition is finally 1 to 10% by weight of graphite, 5 to 15% by weight of CuSi, 2 to 3% by weight of Sn, and the remaining amount of Cu, Fe, and impurities It contains.

In addition, the present invention provides a method of manufacturing a swash plate for a car air conditioner comprising the step of forming a coating layer by thermal spray coating the automotive air conditioner swash plate spray composition on the car air conditioner swash plate.

The swash plate is used to compress the refrigerant for automobile air conditioners, the coating method for coating the spray powder composition of the present invention for the production of the swash plate is preferably carried out by a low temperature spray coating method. This is because, by using the conventional thermal spray coating method, graphite having excellent low friction characteristics is very unstable with heat, so that it cannot be oxidized during thermal spraying or maintain proper characteristics.

The low-temperature spray coating is a high-pressure spraying nitrogen gas of about 25 Kgf / ㎠ to about 300 ℃ by spraying a high-speed nitrogen gas with the spray powder through a supersonic nozzle to coat the high-speed spray powder composition to adhere to the base material It is good.

Hereinafter, preferred examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention, and the scope of the present invention is not limited to the following examples.

EXAMPLE

Example 1

A spray powder was prepared prior to the thermal spray coating on the swash plate used to compress the refrigerant for automobile air conditioners.

First, the thermal spray powder was prepared Cu-Sn-based and Cu-Si-based thermal spray powder, the composition of the thermal spray powder is designed for the purpose of improving the adhesion resistance, wear resistance, and slip resistance of the coating layer, the powder is prepared in the desired alloy design The constituents were determined through the determination, weighed out and dissolved in an induction furnace.

Subsequently, tapping was performed at a temperature of about 80 ° C. higher than the dissolution temperature of the alloying element analyzed through the state diagram. At this time, nitrogen gas was injected into the molten metal at high speed to prepare a powder.

The powders prepared above were classified to a suitable size to obtain a powder of 75 μm or less.

94% by weight of Cu-Sn-based powder and 5% by weight of Cu-Si-based powder were uniformly mixed with 1% by weight of graphite powder to prepare a final spray powder composition.

A coating layer was formed on the swash plate used to compress the refrigerant for automobile air conditioners by using the prepared thermal spray powder by a low temperature spray coating method. At this time, the low-temperature spray coating is heated to about 300 ℃ high pressure nitrogen gas of about 25 Kgf / ㎠ to spray high-speed nitrogen gas with the spray powder through the supersonic nozzle so that the high-speed spray powder composition is attached to the base material It was.

Examples 2-5 and Comparative Example 1

Except for using the composition shown in Table 1 in Example 1 was carried out in the same manner as in Example 1.

Comparative Example 2

A swash plate manufactured by Sanden, Japan was used.

The unit in Table 1 below is weight percent.

division Cu-Sn system Cu-Si system Graphite Example 1 94 5 One Example 2 91 5 4 Example 3 81 15 4 Example 4 83 10 7 Example 5 80 10 10 Comparative Example 1 75 15 10

In order to measure the quenching characteristics using the swash plates of Examples 1 to 5 and Comparative Examples 1 to 2, friction coefficients were measured under boundary lubrication conditions, and the results are shown in Table 2 below.

division Example Comparative example One 2 3 4 5 One 2 Coefficient of friction 0.09 0.07 0.04 0.04 0.11 0.13 0.2

As shown in Table 2, the spray powder composition containing 65 to 95% by weight of Cu-Sn-based powder, 1 to 10% by weight of graphite powder, and 5 to 15% by weight of Cu-Si-based powder according to the present invention. In Examples 1 to 5 coated with the swash plate, the friction coefficient was lower than that of Comparative Examples 1 and 2, and it was confirmed that the low friction characteristics were excellent. In addition, through Examples 1 to 5 according to the present invention, the friction coefficient was mainly influenced by the content of graphite, and the content of the friction coefficient decreased as the content of graphite increased.

In addition, the wear test was performed to measure the wear characteristics using the swash plate of Examples 1 to 5 and Comparative Examples 1 to 2.

The abrasion test was carried out in the marginal lubricaton area of 28 kgf and RPM 1,000, which is the standard of the abrasion test of the swash plate use company. Table 3 shows.

division Example Comparative example One 2 3 4 5 One 2 Wear (mg) 3.1 2.9 3.6 3.9 8.0 12.8 29

As shown in Table 3, the thermal spraying powder composition containing 65 to 95% by weight of Cu-Sn-based powder, 1 to 10% by weight of graphite powder, and 5 to 15% by weight of Cu-Si-based powder. In Examples 1 to 5 coated with the swash plate, it was confirmed that the wear and friction characteristics were significantly superior to those of Comparative Examples 1 and 2.

According to the present invention, it is possible to form a coating layer capable of improving lubricity without using lead that is extremely harmful to the environment, thereby improving low friction and quenching properties, and at the same time, significantly improving wear resistance, slippage, and service life. It does not use lead, so it is environmentally friendly.

Although only described in detail with respect to the described embodiments of the present invention, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, it is natural that such variations and modifications belong to the appended claims. .

Claims (6)

In the thermal spraying powder composition for automobile air conditioner swash plate, a) 65-95 wt.% Cu—Sn based powder; b) 1 to 10% by weight graphite powder; c) 5 to 15% by weight of Cu-Si-based powder; And d) residual Cu, Fe, and impurities Spray powder composition for automobile air conditioner swash plate comprising a. The method of claim 1, The Cu-Sn-based powder, graphite powder, and Cu-Si-based powder a) weighing to correspond to a reference amount of each component; b) dissolving for each component after completion of basis weight; c) cooling and micronizing by injecting high-pressure nitrogen gas at a high speed while simultaneously tapping each other after the dissolution; And d) classifying the finely divided components Thermal spraying composition for swash plate of a car air conditioner, characterized in that it is prepared through. The method of claim 2, The hot water spraying powder composition for automobile air conditioner swash plate, characterized in that the tapping is carried out at a temperature of about 80 ℃ higher than the melting temperature of the alloying elements (Cu-Sn-based powder, graphite powder, and Cu-Si-based powder). A method of manufacturing a swash plate for an automobile air conditioner comprising the step of forming a coating layer by thermally spraying the thermal spraying composition for an automobile air conditioner swash plate according to claim 1. The method of claim 4, wherein The thermal spray coating is a low-temperature spray coating method of manufacturing a car air conditioner swash plate. The method of claim 5, The low-temperature spray coating is heated to about 300 ℃ high pressure nitrogen gas of about 25 Kgf / ㎠ to spray high-speed nitrogen gas with the spray powder through a supersonic nozzle so that the high-speed spray powder composition is attached to the base material and coated Method for manufacturing a car air conditioning swash plate characterized in that.