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C/SiC composite material surface oxidation-resistant coating and method for making same

An anti-oxidation coating and composite material technology, applied in metal material coating technology, coating, gaseous chemical plating, etc., can solve the problem of limited anti-oxidation effect, low effective service life of coating, and anti-oxidation protection effect of coating problems such as weakening

Inactive Publication Date: 2008-03-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former has limited anti-oxidation effect and is usually limited to use below 1000°C; the latter mostly uses a single coating preparation technology to prepare a single-layer single-component ceramic coating. During use, or due to thermal expansion of the coating and the substrate Cracks are formed due to mismatch, or peeling off due to poor bonding between the coating and the substrate, which weakens the anti-oxidation protection of the coating and reduces the effective service life of the coating
At present, a large number of researches on anti-oxidation protection cannot fundamentally solve the problem of long-term oxidation of C / SiC composites at 1400 °C.

Method used

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  • C/SiC composite material surface oxidation-resistant coating and method for making same
  • C/SiC composite material surface oxidation-resistant coating and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation process and process parameters are as follows: the surface of the C / SiC composite material prepared by the MSI or CVI process is ground and polished, and the size after grinding and polishing is 20×20×5 mm, then ultrasonically cleaned, and dried for use; (1) the above The treated composite is placed in a CVD furnace. Use MTS as the silicon source, use a constant temperature water bath, and keep the temperature of MTS at any temperature between 28-35°C; use Ar as the dilution gas (flow rate is 200-300ml / min), 2 As the carrier gas, MTS was brought into the CVD furnace by bubbling to prepare SiC coating. Process parameters: the deposition pressure is 200-250Pa, the deposition temperature is 1050-1150°C, and the molar ratio in the step (1) is H 2 / MTS=(8~10) / 1, deposition time 5~7h; (2) Si powder (300~400 mesh), Mo powder (400~550 mesh) and silica sol (chemically pure) are used as raw materials. According to Si powder: Mo powder: silica sol mass ratio 30~4...

Embodiment 2

[0034] The preparation process and process parameters are as follows: the surface of the composite material prepared by the MSI process is ground and polished, and the size is 40 × 5 × 3 mm after grinding and polishing, and then ultrasonically cleaned and dried for use; other steps are the same as in Example 1.

[0035] In an open silicon-molybdenum rod furnace, heat up to 1400°C. After the temperature is stable, put the coating sample in the furnace, oxidize it for 5 minutes, and quickly put it into a constant temperature water bath at 100°C to quickly cool down to 100°C. After drying, weigh it . Repeat the above thermal shock process. The cumulative times of thermal shocks were 25 and 50 respectively.

[0036] The thermal shock results of the prepared coating samples at 1400°C100°C are as follows:

[0037] During the thermal shock process of the coating sample, the coating remains intact without falling off or falling off. After 25 thermal shocks and 50 thermal shocks, th...

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Abstract

The present invention discloses a coating on C / SiC composite material and the relative preparation method; the coating comprises SiC coating connected with the base C / SiC composite material, and Mo-Si coating, SiC coating, Mo-Si coating, and SiC in turn. The Mo-Si coating is mixed with the following components with the weight ratio: 30-40 percent of Si powder, 10-20 percent of Mo powder and 50-60 percent of chemical pure silicon solution. The coating of the present invention can be used for long time in 1400 DEG C oxidation environment; the present invention has not only lower oxidation weightlessness ratio and higher intension holding ratio, but also has excellent anti-heat and vibration performance.

Description

technical field [0001] The invention relates to a surface treatment of a carbon / ceramic composite material, in particular to a 1400°C long-life anti-oxidation coating on the surface of a C / SiC composite material and a preparation method thereof. Background technique [0002] C / SiC composite materials have the advantages of low density, thermal shock resistance, wear resistance, excellent high temperature mechanical properties and stable friction coefficient, etc., and have been widely used in aerospace and other fields. However, the carbon fibers in C / SiC composites show obvious weight loss and strength reduction in the air above 400 °C, resulting in material performance degradation or even complete failure, while C / SiC composites are mostly used as structural engineering components. in an oxidizing atmosphere. Therefore, it is necessary to protect C / SiC composites against oxidation. [0003] The anti-oxidation protection of C / SiC composites can be divided into matrix modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/90C04B41/87C04B41/88C23C16/32C23C16/52B22F7/00
Inventor 熊翔闫志巧肖鹏陈峰
Owner CENT SOUTH UNIV
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