Method for changing material surface nano property

A performance, nano-technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of unsatisfactory surface quality, long nano-coating time, etc., to achieve easy automation, accelerated expansion speed, time reduced effect

Inactive Publication Date: 2011-08-03
JIANGSU UNIV
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Problems solved by technology

However, it often takes a long time to obtain nano-coating, and the surface quality is not ideal.

Method used

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  • Method for changing material surface nano property
  • Method for changing material surface nano property
  • Method for changing material surface nano property

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specific Embodiment 1

[0018] Specific embodiment one: taking 00Cr12 alloy heat-resistant steel as an example, carry out the surface treatment method referred to in the present invention, after cleaning and polishing the sample, apply black paint as the energy absorbing layer, and use running water as the constraining layer to carry out laser Impact strengthening, the laser pulse width is 20~30ns, the wavelength is 1.06μm, and the pulse energy is 10~35J. After the impact, micro pits are produced on the surface layer, and the material is refined; then the black paint is cleaned, dried, boxed, and aluminized by heating , The aluminizing process parameters are: 5% to 20% Al-Fe alloy powder for the infiltration agent, 1% to 5% ammonium chloride for the activator, and 60% to 80% alumina powder as the filler. After the aluminized powder is fully mixed, put it into a stainless steel tank, bury the 00Cr12 alloy heat-resistant steel in it, and seal the port with a stainless steel cover plate and refractory so...

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Abstract

The invention discloses a method for changing the material surface nano property, and relates to the technical field of machinery manufacturing, metal surface strengthening and nano technique. The method comprises the following steps of: impacting a pretreated material surface layer by using laser beams with high-power density and short pulse; then carrying out powder aluminizing at the temperature of 450 DEG C-600 DEG C; after cleaning, impacting an aluminized aluminide coating by using the laser beams, and finally obtaining the aluminide coating in nano structure. With the process sequence, the method greatly reduces the obtaining time of the surface coating and improves the high-temperature oxidization resistance and corrosion resistance of the material; meanwhile, the material surface generates ultrahigh-strain rate plastic deformation so that high-amplitude remnant pressure stress is generated, and the coating structure can prevent the release of remnant stress in high-temperature environment, so that the high-temperature fatigue life of the material is prolonged. Therefore, the aluminide coating obtained in the method can comprehensively improves the high-temperature oxidization resistance, corrosion resistance, wear resistance and high temperature fatigue life of the material.

Description

technical field [0001] The invention relates to the fields of mechanical manufacturing, metal surface strengthening technology and nanotechnology, in particular to a composite treatment technology of laser shock strengthening and aluminizing to change the nanometer properties of the material surface and obtain an aluminide coating close to the nanostructure, especially suitable for aerospace Surface modification of component materials in high temperature environments such as petroleum, chemical, and construction machinery. Background technique [0002] In many industries, such as aerospace, construction machinery, shipbuilding, petrochemical industry, most components operate in high temperature, highly corrosive, and highly oxidative environments, so component materials are required to have good high temperature fatigue characteristics and oxidation resistance. . The instability of most materials begins on the surface, so the properties of the surface material are particula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C21D1/09C23C10/28
Inventor 任旭东皇甫喁卓张永康周益军阮亮姜大伟张田
Owner JIANGSU UNIV
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