A method of obtaining a protective coating on the surface made of cast iron parts, as well as the engine, at least one made of cast iron part, provided on its surface a protective coating

 

The invention relates to a method for producing a protective coating on the surface of parts made of cast iron. Can be used to produce a protective coating of engine parts. Method for obtaining a protective coating of aluminum bronze. A part of cast iron napravlyayut layer of aluminum bronze containing remote from cast iron soft layer and close to the iron more solid supporting layer. Alternative a coating deposited on the coating layer by deposition of an additional layer of aluminum bronze. Also described engine containing at least one piece of cast iron with a deposited coating of aluminum bronze. The technical result is the ability to simultaneously obtain a solid and durable base layer of the coating and a soft break-in layer. 3 S. and 14 C.p. f-crystals, 2 Il.

The invention relates to a method for consisting of aluminum bronze protective coating with a relatively soft remote from cast iron layer and below it, substantially harder and more wear resistant bearing layer on the surface of the parts consisting of iron as the base material, as well as to the engine, at least on the Sabbath.

From WO-A-98/25017 a method of obtaining consisting of aluminum bronze protective coating on the surface of the parts consisting of steel, cast steel or cast iron. Protective coating sprayed in the form of short covering each other layer by thermal spray method, and the integrated layer forms a covering layer, and at least one additional integrated layer - supporting layer. Supporting and covering layers sprayed in accordance with this consistently, and they are in two different, sequentially deposited layers. To achieve quality bearing and a covering layer applied special measures, such as different types of deposition. The known method is therefore relatively complicated.

Accordingly, the present invention is to provide a method of the above kind, which parts consisting of iron as the base material, a simple way would be to obtain the relatively soft remote from cast iron and a relatively rigid load-bearing layers.

This problem is solved by a method of producing a protective coating of aluminum bronze, including drawing on a piece of cast iron coatings containing soft remote from cast iron layer and balaski with the receiving layer of aluminum bronze, contains remote from cast iron soft layer and close to the iron more solid supporting layer.

It is appropriate that before welding carry out heating of the details.

The heating is carried out to a temperature of 400C.

It is preferable that napravlyayut aluminum bronze containing 8-25% aluminum, at least one component selected from the group comprising antimony, cobalt, beryllium, chromium, tin, manganese, silicon, cadmium, zinc, iron, Nickel, lead, and carbon in an amount of 0.2-10% and the rest copper.

For the formation of a relatively soft remote from the iron layer napravlyayut aluminum bronze containing components in the following ratio, %:

Aluminum 8-11

Nickel 4-6

Iron 3-5

Manganese 1-2

Copper the Rest

For the formation of a relatively solid remote from the iron layer napravlyayut aluminum bronze containing components in the following ratio, %:

Aluminum 13-16

Iron 4-5

Silicon 0,2-0,8

Manganese 1-2

Carbon Less than 0.2

Copper the Rest

Advisable is the fact that to obtain a two-layer coating napravlyayut aluminum bronze with receiving layer with a thickness of 2-3 mm, mostly 2.5 mm

It is preferable that aluminum bronze gnapelet is expected that in their close to the iron zone is significantly harder than its remote from the iron zone. Therefore, within the same layer is automatically formed close to the material-based, relatively rigid supporting layer and remote from the base material, relatively soft remote from the iron layer, which can serve as break-layer spontaneously disappearing at the stage of break-in, so then effective base layer. During experiments with deposited directly on the cast iron with a layer of aluminum bronze in the area of external remote from the iron layer were found expected the color and hardness of aluminum bronze. In downstream, close to the cast iron district was able to establish, however, a fourfold hardness than the outer layer. Because the coatings can be obtained at the same time soft remote from cast iron and solid load-bearing layers, this is the preferred way ensures high efficiency.

The task is also solved by a method of producing a protective coating of aluminum bronze, including drawing on a piece of cast iron coatings containing soft remote from cast iron layer and more solid and durable base layer, in which according to the invention the coating on the detail put by naplan additional layer of aluminum bronze, each of the layers contains a remote from cast iron soft layer and close to the iron more solid supporting layer.

When fusing two layers of aluminum bronze, and the first layer napravlyayut directly forming on the base material cast iron, and the second one-the first, in each layer are formed two layers in the form of a relatively soft, remote from cast iron and more solid in comparison with him, close to the iron layers, and the degree of hardness of the layers of the outer layer is higher than the degree of hardness of the layers below the layer. This decision should, in particular, is preferable when it is desirable particularly high degree of hardness.

It is appropriate that before welding carry out heating of the workpiece. The heating is carried out to a temperature of 400C. due to this, it is possible to increase the thickness of the solid carrier layer. It is appropriate that the aluminium bronze napravlyayut to the corresponding base by welding. It is simple and economical.

Used aluminum bronze can be cast in respect of its members in accordance with the needs of each individual case.

It is appropriate that at wybrany from the group including antimony, cobalt, beryllium, chromium, tin, manganese, silicon, cadmium, zinc, iron, Nickel, lead, and carbon in an amount of 0.2-10% and the rest copper.

It is preferable that at least one layer napravlyayut aluminum bronze containing components in the following ratio, %:

Aluminum 8-11

Nickel 4-6

Iron 3-5

Manganese 1-2

Copper the Rest

Also preferred is that at least one layer napravlyayut aluminum bronze containing components in the following ratio, %:

Aluminum 13-16

Iron 4-5

Silicon 0,2-0,8

Manganese 1-2

Carbon Less than 0.2

Copper the Rest

To obtain a two-layer coating napravlyayut aluminum bronze with receiving layer with a thickness of 2-3 mm, mostly 2.5 mm

It is appropriate that the aluminium bronze napravlyayut cast iron containing graphite.

In the engine, in particular a reciprocating engine containing at least one item made of cast iron according to the invention, the item is made of cast iron containing predominantly shallow, compacted or spherical graphite, the item coated aluminium bronze, which is a layer containing remote from cast iron layer and chosen to replace the oil, at least one cast iron piece, provided on its surface a protective coating with a relatively soft, wear on stage running remote from cast iron and below it, substantially harder and more wear resistant bearing layers, can be achieved through the application of the method according to the invention, to achieve a simple way for a long service life. When this protective coating having consisting of aluminum bronze layer contains two areas as remote from cast iron layer (9) and base layer (8), and the hardness and color forming remote from the iron layer (9) zone corresponds to normal hardness and color used aluminum bronze, and forming the underlying base layer (8) zone has four times the hardness in comparison with the external area.

Other appropriate measures given in the following description of the example run-through of the drawings, which show:

- Fig.1 is a partial view of the cylinder two-stroke diesel engine of large displacement in the context;

- Fig.2 shows an enlarged section of the device according to Fig.1, provided with a protective coating.

The presented invention can find application in cases where the item is made of chugunnoe protective coating, containing an outer, relatively soft remote from cast iron and underneath significantly more solid bearing layers. This can be, for example, various engine components such as pistons, piston rings, grooves for piston rings, skirt pistons, working surfaces of the cylinders and so on, since these items require an external soft remote from the iron layer, disappearing at the stage of break-in, and inside, the more solid the base layer, which is followed by the stage of break-in and should have a long service life.

Is depicted in Fig.1 cylinder two-stroke diesel engine has a large working volume contains the inner casing 1, provided with inlet Windows (not shown) on which is mounted a cylinder (not shown), fitted with a venting device. The inner side of the sleeve 1 cylinder is made as a working surface, with which communicates the piston 4, is equipped located in the respective grooves 2 piston rings 3. Sleeve 1 cylinder, the piston 4 and piston ring 3 is made of cast iron, usually gray cast iron containing surface, compacted or spherical graphite. In the area of the working surface of the sleeve 1 cylinder, the peripheral surface of the piston the second has better bearing properties, than consisting of a cast iron material-based, and accordingly increases the service life.

Such protective coating 5 may be self-inflicted also on other details of two-stroke diesel engine has a large working volume, subjected to similar loading conditions, for example crosshead bearings or crosshead guides.

The protective coating 5, as best seen from Fig.2, is formed by a layer 7 of a suitable aluminum bronze, deposited on the base material 6 is advisable by welding. However, as it turned out unexpectedly formed two layers 8, 9, indicated in Fig.2 a dashed dividing line. The external remote from the base material layer 9 is expected from used aluminum bronze color and hardness. This external remote from the iron layer is in accordance with this relatively soft and therefore suitable as a break-in layer, which is at the stage of running-in disappears by itself. Downstream, close to the material-based layer 8 has compared to him substantially greater hardness and may therefore serve as a wear-resistant base layer, the current in the case of the disappearance remote from the iron layer.

edema hardness of 200 HV, while the inner layer is four times higher hardness of 800 HV. The thickness of the layer 7 containing both layers 8, 9, was about 2.5 mm, and the thickness of the solid base layer was about 1.5 mm, and the outer soft remote from the iron layer is about 1 mm due to the heating of the base material 6 to approximately 400With managed to increase the width of the solid carrier layer 8.

As a material for the formation of the layer 7 can be applied aluminum bronze containing 8-25% A1, at least one of the components Sb, Co, Be, Cr, Sn, Mn, Si, Cd, Zn, Fe, Ni, Pb and in the amount of 0.2-10% and the rest of si. If must be obtained relatively soft remote from the iron layer, there can be used aluminum bronze containing 8-11% A1, 4-6% Ni, 3-5% Fe, 1-2% MP and the rest of si. When using such aluminum bronze hardness in the area of external remote from the iron layer 9 was about 200 HV. Such aluminum bronze was the basis of the above-described example. In some cases, external remote from the iron layer 9 should be slightly greater hardness. Here expedient is the use of aluminum bronze with 13-16% A1, 4-5% of Fe, 0.2 to 0.8% Si, 1-2% MP, most of 0.2% and the rest of si. When using indoor base layer 8 was in any case much higher than the hardness of the external remote from the iron layer 9. Here it was possible to achieve a hardness of 900 HV.

Consisting of aluminum bronze layer 7, as already mentioned above, can be deposited on the base material 6 in the welding process. This may find application electric light arc, or flame, or laser beams.

Other experiments showed that each other can accommodate several layers, mainly two layers, and the degree of hardness of the layers increases with distance from the base material 6, i.e., the degree of hardness of the outer layer of higher hardness underneath layer. For example, during experiments with two layers of the same aluminum bronze with 13-16% A1, 4-5% of Fe, 0.2 to 0.8% Si, 1-2% Mn, less than 0.2% and the rest of C in the area of the upper layer was installed hardness of about 400 HV, and in the area of the outer layer of the second layer hardness up to about 600 HV.

Claims

1. A method of obtaining a protective coating of aluminum bronze, including drawing on a piece of cast iron coatings containing soft remote from cast iron layer and more solid and durable base layer, characterized in that the coating on the detail applied by welding with the receiving layer of aluminum bronze containing remote from cast iron soft layer and Aut heating parts.

3. The method according to p. 2, characterized in that the heating is carried out until a temperature of 400C.

4. The method according to any of paragraphs.1-3, characterized in that napravlyayut aluminum bronze containing 8-25% aluminum, at least one component selected from the group comprising antimony, cobalt, beryllium, chromium, tin, manganese, silicon, cadmium, zinc, iron, Nickel, lead, and carbon in an amount of 0.2-10% and the rest copper.

5. The method according to p. 4, characterized in that for the formation of a relatively soft remote from the iron layer napravlyayut aluminum bronze containing components in the following ratio, %:

Aluminum 8-11

Nickel 4-6

Iron 3-5

Manganese 1-2

Copper the Rest

6. The method according to any of paragraphs.1-3, characterized in that for the formation of a relatively solid remote from the iron layer napravlyayut aluminum bronze containing components in the following ratio, %:

Aluminum 13-16

Iron 4-5

Silicon 0,2-0,8

Manganese 1-2

Carbon less than 0.2

Copper the Rest

7. The method according to any of paragraphs.1-6, characterized in that to obtain a two-layer coating napravlyayut aluminum bronze with receiving layer with a thickness of 2-3 mm, mostly 2.5 mm

8. The method according to p. 1, wherein the aluminum bronze napravlyayut cast iron, Sal from cast iron cover, containing soft remote from cast iron layer and more solid and durable base layer, characterized in that the coating on the workpiece is applied by deposition, with a layer of aluminum bronze weld directly on the cast iron, napravlyayut at least one additional layer of aluminum bronze, and each layer contains remote from cast iron soft layer and close to the iron more solid supporting layer.

10. The method according to p. 9, characterized in that before welding carry out heating of the details.

11. The method according to p. 10, characterized in that the heating is carried out until a temperature of 400C.

12. The method according to any of paragraphs.9-11, characterized in that at least one layer napravlyayut aluminum bronze containing 8-25% aluminum, at least one component selected from the group comprising antimony, cobalt, beryllium, chromium, tin, manganese, silicon, cadmium, zinc, iron, Nickel, lead, and carbon in an amount of 0.2-10% and the rest copper.

13. The method according to p. 12, characterized in that at least one layer napravlyayut aluminum bronze containing components in the following ratio, %:

Aluminum 8-11

Nickel 4-6

Iron 3-5

Manganese 1-2

Copper the Rest

14. The method according to any of paragraphs.9-11, otlichayushiesya, %:

Aluminum 13-16

Iron 4-5

Silicon 0,2-0,8

Manganese 1-2

Carbon Less than 0.2

Copper the Rest

15. The method according to any of paragraphs.9-14, characterized in that to obtain a two-layer coating napravlyayut aluminum bronze with receiving layer with a thickness of 2-3 mm, mostly 2.5 mm

16. The method according to p. 9, wherein the aluminum bronze napravlyayut cast iron containing graphite.

17. The engine, in particular a piston engine with at least one item made of cast iron, characterized in that the item is made of cast iron containing predominantly shallow, compacted or spherical graphite, the item coated aluminium bronze, which is a layer containing remote from cast iron layer and the supporting layer, and the hardness of the base layer is four times the hardness remote from the iron layer.

 

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