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Metal-ceramic composite coating layer for steel piston

A ceramic composite, steel piston technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of high temperature strength drop, large coating thickness, corrosion and other problems, to reduce heat conduction downward, Simple preparation method and high dimensional accuracy

Active Publication Date: 2017-11-10
BINZHOU BOHAI PISTON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the temperature of the heating furnace reaches 750°C to 850°C during the electroplating process, and the heat preservation time is 30-40min, the high temperature strength (creep limit and enduring strength) of the steel piston matrix is ​​significantly reduced. At this temperature and time, the piston has turned red as a whole and will Severe corrosion and deformation will have a great impact on the overall performance of the piston, and the probability of scrapping is extremely high
At the same time, this process takes a long time and has low production efficiency.
[0007] The thickness of the electroplated aluminum coating mentioned in the patent is 200±50 μm, which is very difficult for the repeated positioning accuracy of turning, and it is very easy to completely remove the aluminum coating due to the deviation caused by repeated clamping. , the severe corrosion and deformation caused by the high temperature of the electroplating process further aggravated the deviation of the clamping accuracy
[0008] Due to the large total thickness of the coating, the impact on the size of the piston cannot be ignored, and no relevant solutions are mentioned in the patent

Method used

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  • Metal-ceramic composite coating layer for steel piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The steps of the method are:

[0052] Reserved size→2, arc sprayed pure aluminum metal layer→3, secondary machining→4, hard anodizing.

[0053] Detailed description: (Assuming that the metal layer is a and the ceramic layer is b, the total thickness of the coating is A=a+b / 2)

[0054] 1. Reserve size: Before preparing the coating, you need to reserve a size for the thickness of the coating to prevent the thickness of the coating from affecting the size of the piston. The specific method is to process an extra layer in the area to be processed when processing the piston. Consistent with coating thickness A;

[0055] 2. Arc spraying pure aluminum metal layer: the pure aluminum layer is sprayed on the predetermined position by the arc spraying process, the spraying voltage is 30-50V, the current is 200-300A, the pure aluminum wire with a purity of 99.999% is used, the wire diameter is 1.0mm, and the wire feeding speed is 10 -20mm / s, compressed air pressure 0.6-0.8MPa, time 3-5min...

Embodiment 2

[0059] The steps of the method are:

[0060] Reserved size→2, arc spraying pure magnesium metal layer→3, secondary machining→4, hard anodizing.

[0061] Detailed description: (Assuming that the metal layer is a and the ceramic layer is b, the total thickness of the coating is A=a+b / 2)

[0062] 1. Reserve size: Before preparing the coating, you need to reserve a size for the thickness of the coating to prevent the thickness of the coating from affecting the size of the piston. The specific method is to process an extra layer in the area to be processed when processing the piston. Consistent with coating thickness A;

[0063] 2. Arc spraying pure magnesium metal layer: the pure magnesium layer is sprayed on the predetermined position by the arc spraying process, the spraying voltage is 30-50V, the current is 200-300A, the pure magnesium wire with a purity of 99.999% is used, the wire diameter is 1.0mm, and the wire feeding speed is 10 -20mm / s, compressed air pressure 0.6-0.8MPa, time 3...

Embodiment 3

[0067] The steps of the method are:

[0068] Reserved size→2, arc sprayed pure titanium metal layer→3, secondary machining→4, hard anodizing.

[0069] Detailed description: (Assuming that the metal layer is a and the ceramic layer is b, the total thickness of the coating is A=a+b / 2)

[0070] 1. Reserve size: Before preparing the coating, you need to reserve a size for the thickness of the coating to prevent the thickness of the coating from affecting the size of the piston. The specific method is to process an extra layer in the area to be processed when processing the piston. Consistent with coating thickness A;

[0071] 2. Arc sprayed pure titanium metal layer: the pure titanium layer is sprayed on the predetermined position by the arc spraying process, the spraying voltage is 30-50V, the current is 200-300A, the pure titanium wire with a purity of 99.999% is used, the wire diameter is 1.0mm, and the wire feeding speed is 10 -20mm / s, compressed air pressure 0.6-0.8MPa, time 3-5min....

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Abstract

The invention provides a metal-ceramic composite coating layer for a steel piston. A mature arc spraying technology is introduced; a layer of such compact materials easy to perform electrochemical oxidation as aluminum, magnesium and titanium is firstly prepared on the top surface of the steel piston; and then, on this basis, such electrochemical methods as hard anodic oxidation and microarc oxidation are used for preparing a thermal insulation layer. An area to be treated of the steel piston is machined; the arc spraying is adopted to form a metal transition layer on the surface of the machined steel piston; the steel piston covered with the metal transition layer is secondarily machined; and a ceramic thermal insulation layer is prepared on the surface of the secondarily machined steel piston by adopting the electrochemical method. As the metal spraying difficulty is far lower than the spraying of such ceramic materials as zirconium oxide and aluminum oxide, the arc spraying is particularly adopted, and the manufacturing cost is greatly reduced.

Description

Technical field [0001] The invention belongs to the field of thermal barrier coatings, and particularly relates to a metal-ceramic composite coating for steel pistons. Background technique [0002] In the manufacture of aluminum pistons, electrochemical methods such as hard anodic oxidation and micro-arc oxidation are often used to prepare thermal insulation coatings on the top surface of the piston, but these technologies cannot be used on steel pistons. [0003] The existing technologies include thermal spraying and sintering methods to directly prepare zirconia, alumina and other coatings on steel or steel pistons. Among them, plasma spraying is used to prepare iridium oxide stabilized zirconia, and it is used in aerospace, boilers, etc. There are many industry applications. [0004] The existing technology must be carried out with the aid of plasma spraying equipment, and the equipment and materials are expensive. [0005] The prior art is directly spraying ceramic coating on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/131C23C4/08C23C4/18B23P15/00
CPCB23P15/00C23C4/08C23C4/18
Inventor 刘国强赵小峰刘涛李红伟赵子宇
Owner BINZHOU BOHAI PISTON CO LTD
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