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Method for ceramic treatment of metal surface

A ceramization and pretreatment technology, applied in metal material coating process, ion implantation plating, superimposed layer plating, etc., can solve the problem that the ceramic layer is easily damaged and peeled off, the connection result cannot be achieved, the structure and physicochemical Disparities in nature, etc.

Inactive Publication Date: 2005-06-01
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at the problem of organically combining the dual characteristics of steel and ceramics, self-propagating high-temperature synthesis technology (combustion synthesis) has been used in the past to ceramize steel-based metals. There is an early failure problem at the connection interface of the phase material, and the satisfactory connection result cannot be achieved, and the ceramic layer is easily damaged and peeled off

Method used

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  • Method for ceramic treatment of metal surface
  • Method for ceramic treatment of metal surface
  • Method for ceramic treatment of metal surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] [Example 1] with Na 2 CO 3 Deploy 2-4% cleaning solution, use soaking, stirring and spraying methods to clean the surface of the workpiece, then rinse with active water, leaving no cleaning solution on the surface, and finally carry out ultrasonic short-term comprehensive cleaning; use vacuum evaporation method in the Prepare a 5 μm thick aluminum layer on the surface of the cleaned substrate, and the vacuum degree is 1.3×10 -2 Pa, the temperature of the evaporation source is 1400°C, the purity of aluminum is 99.5%, the coating time is 1h, and the temperature of the coating substrate is 50°C; In the mixed solution of quartz sand and water glass prepared at a ratio of 1:1, the diffusion temperature is 300°C, and the diffusion time is 1h, so that the atoms between the aluminum layer and the substrate diffuse each other to form a compound alloy layer with a firm bond; The aluminum layer on the surface adopts the method of plasma electrolytic oxidation to grow the ceramic...

Embodiment 2

[0025] [Example 2] Select 2-4% derusting agent to clean the substrate surface, then adopt vacuum evaporation to prepare a 100 μm thick aluminum layer on the cleaned substrate surface, and the vacuum degree is 1.3×10 -3 Pa, the evaporation source temperature is 1500°C, the purity of aluminum is 99.9%, the coating time is 3 hours, and the coating substrate temperature is 200°C; after aluminum plating, use quartz sand and water glass as the surface protection agent of the sample, and place the sample in a press In the mixed solution of quartz sand and water glass prepared at a ratio of 1:2, the diffusion temperature is 600°C, and the diffusion time is 3 hours, so that the atoms between the aluminum layer and the substrate diffuse each other to form a compound alloy layer with a firm bond; ceramic electrolysis The liquid is an acid electrolyte, its main component is sodium silicate, the content is 80g / L, the ceramicization time is 5h, and the current density is 10A / m 2 , the volta...

Embodiment 3

[0026] [Example 3] select 24% hydrochloric acid to clean the substrate surface, then carry out ultrasonic cleaning, and then adopt the vacuum evaporation method to prepare a 100 μm thick aluminum layer on the cleaned substrate surface, and the vacuum degree is 7.1 × 10 -3 Pa, the evaporation source temperature is 1450°C, the purity of aluminum is 99.7%, the coating time is 3h, and the coating substrate temperature is 300°C; after aluminum plating, use quartz sand and water glass as the surface protection agent of the sample, and place the sample in a press In the mixed solution of quartz sand and water glass prepared at a ratio of 1:3, the diffusion temperature is 450°C, and the diffusion time is 2 hours, so that the atoms between the aluminum layer and the substrate diffuse each other to form a compound alloy layer with a firm bond; ceramic electrolysis The liquid is an acidic electrolyte, its main component is sodium silicate, the content is 45g / L, the ceramicization time is ...

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Abstract

The ceramic treating process for the surface of metal base includes the following steps: coating the pre-treated base with one aluminum layer through hot soaking or vacuum treating; and treating the coated aluminum layer to obtain composite system comprising transitional compound layer and outer ceramic phase layer. The key of the present invention is to form alloy layer with matched thickness as the transition layer between the base and the ceramic layer, and the transition layer has metallurgical diffusion gradient change. The present invention features that there are micro plastic aluminum areas between the alloy layer and the Al2O3 ceramic layer to coordinate the deformation resisting effect between the ceramic layer and the base for tight combination.

Description

technical field [0001] The invention relates to a method for ceramicizing the surface of a metal substrate. Background technique [0002] With the development of modern industry and science and technology, the performance requirements for the surface of materials are getting higher and higher, and the performance requirements for the surface of parts are more stringent. Due to its own characteristics and limitations, a single surface treatment technology has been difficult to meet high-speed, heavy-duty, high-temperature applications. And requirements under severe corrosive medium conditions. Ceramic materials are becoming a new generation of engineering materials due to their unique properties such as corrosion resistance, wear resistance, high temperature resistance, and insulation. Due to the high brittleness and poor machinability of single ceramic materials, their wide application has been restricted for a long time. Coating a layer of ceramic materials on the surface ...

Claims

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Application Information

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IPC IPC(8): C23C2/12C23C14/16C23C14/24C23C14/58C23C28/00C25D5/34
CPCC23C28/321C23C28/324C23C28/325C23C28/345
Inventor 夏原吴振强关永军
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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