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Ceramic membrane layer on metal surface and preparation method thereof

A technology of ceramic film and metal surface, which is applied in the field of ceramic film on metal surface and its preparation, can solve the problems of fragile, thin ceramic film, too thin micro-arc oxidation ceramic film, etc. Handle simple, easy-to-implement effects

Inactive Publication Date: 2013-04-03
柯全
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is to provide a ceramic film layer on the metal surface in order to overcome the defects that the ceramic film layer produced by the existing micro-arc oxidation process is too thin, easy to break, and cannot be used in harsh wear-resistant environments. and its preparation method
The method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Taking the mechanical seal ring based on aluminum alloy as an example, the aluminum alloy 2219 is forged here, and after machining, shaping, grinding, and heat treatment, the seal ring blank can be made; after degreasing, cleaning, micro Arc oxidation, cleaning, grinding and other follow-up treatments can be completed.

[0036] Among them, the micro-arc oxidation electrolyte is mainly composed of water glass, and the pH value is adjusted between 11-13. The solution flows through the electrolytic cell through a circulating cooling system. The stainless steel electrolytic cell is connected to the cathode of the power supply, and the blank of the aluminum alloy sealing ring is connected to the anode of the power supply. Use the air pump to stir and cool the electrolyte. The temperature is 20-50°C, and the treatment time is 30-50 minutes. A layer of dense alumina ceramic layer is grown in situ on the surface of the sealing ring. After testing, the thickness is about 60 mic...

Embodiment 2

[0040] The working load of the automobile brake disc is very large, and the temperature rise is obvious. In order to reduce the temperature rise of the brake disc during operation, the thickness of the brake disc should not be too small. In order to ventilate and dissipate heat, generally a ventilation channels. At the same time, in order to ensure the stable and long-lasting operation of the brake disc, in this embodiment, the aluminum alloy 2219 is thixoformed by semi-solid forming to make an automobile brake disc blank, and the brake disc blank is made by machining, grinding, and heat treatment. Embryos are degreased, cleaned, micro-arc oxidized, cleaned and dried. Among them, the micro-arc oxidation electrolyte is mainly composed of water glass, and the pH value is adjusted between 11-13. The solution flows through the electrolytic cell through a circulating cooling system. The stainless steel electrolytic cell is connected to the cathode of the power supply, and the alu...

Embodiment 3

[0043] The TC4 titanium alloy disc sample with a diameter of 16 mm and a thickness of 6 mm was first polished with sandpaper, and then descaled in HF-HNO (1:1), using a self-made two-phase DC pulse micro-arc oxidation power supply (5kW), The sample is treated by micro-arc oxidation in an electrolytic cell cooled by circulating water. The electrolytic cell is made of stainless steel and serves as a cathode. The current density of the positive and negative phases is 8A / dm, and the power frequency is 60Hz. The electrolyte is NaAlO 2 , the concentration is 8g / L. After treatment, the sample with film layer is rinsed with water and dried.

[0044] The ceramic membrane is made of Al 2 TiO 5 , α-Al 2 o 3 and rutile TiO2, where Al 2 TiO 5 Main crystal phase with the most content. Al 2 TiO 5 is al 2 o 3 - TiO 2 The only compound in the system.

[0045] Then use 5KW CO 2 The cross-flow laser adopts the method of simultaneous spraying and cladding to laser cladding ceramic p...

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Abstract

The invention discloses a ceramic membrane layer on a metal surface and a preparation method thereof. The preparation method comprises the following step of carrying out preset type laser cladding or synchronous laser cladding on the ceramic membrane layer and ceramic powder obtained in a micro-arc oxidation process, so as to prepare the ceramic membrane layer. The invention further discloses the ceramic membrane layer prepared by using the preparation method. By utilizing the method, the thickness of the micro-arc oxidation ceramic membrane layer is increased, so that the purposes of increasing the abrasion resistance and corrosion resistance are reached, and the problem that a micro-arc oxidation ceramic membrane layer at present is too thin to meet application to a brake disc and the like with high requirements on the abrasion resistance is solved.

Description

technical field [0001] The invention specifically relates to a ceramic film layer on a metal surface and a preparation method thereof. Background technique [0002] Motor vehicle brakes are almost all mechanical friction type, that is, the braking torque generated by the friction between the two working surfaces of the rotating element and the fixed element is used to slow down or stop the car. Friction brakes are divided into two categories: drum type and disc type according to the shape of their rotating elements. Drum brakes are composed of brake shoes and brake drums. Compared with drum brakes, disc brakes have the advantages of better thermal stability, better water stability, better braking stability, lighter weight and easier maintenance. [0003] The rotating element of the disc brake is a brake disc that is placed vertically and has two sides as working surfaces, and its fixed friction elements are generally brake blocks with friction plates located on both sides o...

Claims

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Application Information

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IPC IPC(8): C23C28/04C25D11/04C23C24/10
Inventor 柯全
Owner 柯全
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