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
CN102140644AInactive Publication Date: 2011-08-03JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU UNIV
Publication Date
2011-08-03
Estimated Expiration
Not applicable · inactive patent

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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.
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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

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
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