Double -gradient composite coating

A composite coating and double-gradient technology, applied in the direction of layered products, etc., can solve problems such as unsatisfactory applications

Inactive Publication Date: 2008-04-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the gradient coating and multi-layer composite coating technology can ease the thermal stress, effectively improve the compatibility between the coating and the substrate, and improve the performance and life of the coating and products, engineering applications, especially those in harsh environments, often still unsatisfactory

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: In the preparation of TaC and SiC composite coatings by chemical vapor deposition on C / C composite materials or graphite, the dual-gradient TaC / SiC composite coatings are low stress, crack-free, thermal shock resistant coatings, and are also high temperature resistant, Anti-oxidation, anti-erosion, anti-ablation coating.

[0023] Since the thermal expansion coefficients of SiC and TaC are higher than that of C / C composite materials, which are about 2 times and 4 times of the C / C matrix expansion coefficient respectively, and both are brittle materials with high elastic modulus, in C / C When a single coating on the surface of a composite material exceeds a certain thickness, the dense coating is prone to penetrating cracks. After multi-layer composite, the TaC / SiC composite coating still has a much larger expansion coefficient than the C / C composite material, and the connection between TaC and SiC coating belongs to chemical bonding, and the connection strength...

Embodiment 2

[0028] Embodiment 2: carry out Fe on the surface of Q235 steel 3 Al / Al 2 o 3 Gradient coating is treated by plasma spraying to improve the wear resistance and oxidation resistance of the material. The thermal shock resistance of the coating is the key to prolonging the service life of the material. From the substrate to the surface of the coating, prepared as Fe 3 Al gradually decreases from 100% to 0, Al 2 o 3 When the gradient coating gradually increases from 0 to 100%, and the thickness is 80-100 μm, the thermal shock test is carried out on a sample with a size of 50mm×50mm, and the number of coating peelings is about 110-130 times. Thermal shock test conditions: In a box-type electric furnace at a temperature of 800°C, keep warm for 20min, then take it out, blow compressed air to cool it to room temperature, and cycle like this until the coating peels off.

[0029] Fe on the surface of Q235 steel 3 Al / Al 2 o 3 During the double gradient coating process, the maximum...

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Abstract

The invention discloses a dual-gradient composite coating. A coating which is arranged on the surface of a basal body comprises a plurality of sub-coatings, which forms a shock wave moving gradient. The shock wave moving gradient is compounded by two simultaneously existing gradients--a composition gradient and a composition wave centre-value gradient. Every sub-coating consists of two composition gradients with opposite composition changing trends. The composition changing trends of adjacent sub-coatings are similar. From the basal body to the surface, the composition medium value which forms gradient composition in adjacent sub-coatings also changes in gradient, namely the composition wave centre-value gradient. The combined effect of multiple coatings and the designing ability of gradient coating are used, and the dual-gradient coating is arranged on the surface of metal, inorganic non-metallic, polymer and composite material and other solid materials. Compared with the ordinary gradient coating, the present invention has the advantage of smaller thermal stress, better thermal stability high thermal shock resistant ability, no significant macro cracks and good connection performance with the basal body.

Description

technical field [0001] The invention relates to a high-performance composite coating coated on the surface of substrates such as solid metals, inorganic non-metals, macromolecules and their composite materials. It is mainly used for the protection of materials and adding new functions, reducing the residual stress of the coating, Cracks and other defects, improve the thermal stability of the coating and the connection performance between the coating and the substrate, and prolong the service life. Background technique [0002] In the late 1980s, after Japanese scientists proposed the concept of "Functionally Gradient Materials (FGM)", the science and technology of functionally graded materials became the focus of attention. FGM is a kind of heterogeneous composite material whose performance changes gradually corresponding to the change of structure and composition through continuous or quasi-continuous change of structure and composition elements. The focus of FGM research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B33/00B32B9/00B32B5/14
Inventor 李国栋熊翔黄伯云肖鹏张红波
Owner CENT SOUTH UNIV
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