Unlock instant, AI-driven research and patent intelligence for your innovation.

A metal-ceramic composite coating for steel piston

A technology of ceramic composite and steel piston, which is applied in metal material coating process, coating, molten spraying, etc., can solve the problems of high temperature strength decrease, large total coating thickness, and difficulty, and reduce heat conduction downward , The preparation method is simple, the effect of low initial investment

Active Publication Date: 2019-06-14
BINZHOU BOHAI PISTON CO LTD
View PDF9 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A metal-ceramic composite coating for steel piston
  • A metal-ceramic composite coating for steel piston
  • A metal-ceramic composite coating for steel piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The steps of the method are:

[0052] Reserved size → 2, arc spraying 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. Reserved size: Before preparing the coating, it is necessary 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 treated when processing the piston. Consistent with coating thickness A;

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

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. Reserved size: Before preparing the coating, it is necessary 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 treated when processing the piston. Consistent with coating thickness A;

[0063] 2. Arc spraying pure magnesium metal layer: use arc spraying process to spray pure magnesium layer at the predetermined position, spraying voltage 30-50V, current 200-300A, use pure magnesium wire with a purity of 99.999%, wire diameter 1.0mm, wire feeding speed 10 -20mm / s, compressed air pressure 0.6-0.8MPa, time 3-5min. The spraying thickne...

Embodiment 3

[0067] The steps of the method are:

[0068] Reserved size → 2, arc spraying 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. Reserved size: Before preparing the coating, it is necessary 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 treated when processing the piston. Consistent with coating thickness A;

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a metal-ceramic composite coating for steel pistons. Introduce mature arc spraying technology, first prepare a layer of dense aluminum, magnesium, titanium and other materials that are easy to be electrochemically oxidized on the top surface of the steel piston, and then use electrochemical methods such as hard anodic oxidation and micro-arc oxidation on this basis Prepare the insulation. Machining the area to be treated of the steel piston; using arc spraying to form a metal transition layer on the surface of the steel piston after machining; performing secondary machining on the steel piston covered with the metal transition layer; The surface of the machined steel piston is prepared with a ceramic insulation layer. Because the difficulty of metal spraying is much lower than that of ceramic materials such as zirconia and alumina, it is especially suitable for arc spraying, and the manufacturing cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of thermal barrier coatings, in particular to a metal-ceramic composite coating for steel pistons. Background technique [0002] In the manufacture of aluminum pistons, electrochemical methods such as hard anodizing and micro-arc oxidation are often used to prepare thermal insulation coatings on the top surface of the pistons, but these technologies cannot be used on steel pistons. [0003] In the prior art, thermal spraying method and sintering method are used to directly prepare coatings such as zirconia and alumina on steel or steel pistons. Among them, there are many solutions for preparing iridium oxide stabilized zirconia by plasma spraying, and it is widely used in aerospace, boilers, etc. There are many industry applications. [0004] The existing technology must be carried out by means of plasma spraying equipment, and the cost of equipment and materials is high. [0005] The existing technology is to direc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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