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A charcoal/charcoal composite material ablation-resisting coating and a preparing process thereof

A carbon composite material and a preparation process technology, applied in the field of materials, can solve the problems of weak bonding strength, easy debonding, and easy falling off of the coating, and achieve the effect of eliminating the stress of the coating

Inactive Publication Date: 2016-04-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the equipment is complicated, the cost is high, and the bonding between the coating and the substrate is weak and easy to debond
However, the above-mentioned coatings cannot meet the practical application requirements under the scour condition of high-speed ion current at 160-2500 degrees Celsius
[0006] Moreover, the ablation-resistant coatings provided by all the above-mentioned documents have a common defect, that is, the coating bonding strength is weak, and it is easy to fall off under the environment of high-speed airflow erosion, and cannot effectively protect the substrate.

Method used

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  • A charcoal/charcoal composite material ablation-resisting coating and a preparing process thereof
  • A charcoal/charcoal composite material ablation-resisting coating and a preparing process thereof
  • A charcoal/charcoal composite material ablation-resisting coating and a preparing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: as figure 1 , figure 2 , image 3 , Figure 4 As shown, the carbon / carbon composite materials were polished and polished with No. 1000, No. 1500 and No. 2000 sandpaper respectively, cleaned with distilled water and absolute ethanol, and dried for later use;

[0028] Weigh 60% Si powder, 30% C powder, 10% Al respectively according to mass fraction 2 o 3 Powder ball milling for 3 hours to make embedding powder, put half of the prepared embedding powder into the graphite crucible, put the treated carbon / carbon composite material, and then use the other half of the embedding powder to mix the carbon / carbon Cover with composite material and cover with graphite lid; put the graphite crucible into the vertical vacuum furnace of the graphite heating element, and the vacuum degree reaches 5×10 -3 After Pa, feed a protective gas with a flow rate of 500ml / min (the protective gas is an inert gas), raise the furnace temperature to 1800°C at a rate of 7.5°C / min, k...

Embodiment 2

[0035] Example 2: The carbon / carbon composite material was polished and polished with No. 1000, No. 1500 and No. 2000 sandpaper respectively, cleaned with distilled water and absolute ethanol, and dried for later use;

[0036] Weigh 80% Si powder, 15% C powder and 5% Al respectively according to mass fraction 2 o 3 Powder ball milling for 3 hours to make embedding powder, put half of the prepared embedding powder into the graphite crucible, put the treated carbon / carbon composite material, and then use the other half of the embedding powder to mix the carbon / carbon Cover with composite material and cover with graphite lid; put the graphite crucible into the vertical vacuum furnace of graphite heating element, after the vacuum degree reaches 5×10-3Pa, pass in the protective gas with a flow rate of 500ml / min, at 12℃ / Raise the furnace temperature to 2000°C at a heating rate of 1 min, keep it warm for 2 hours, then lower the furnace temperature to 1000°C at a cooling rate of 7°C...

Embodiment 3

[0042] Embodiment 3: The carbon / carbon composite material is polished and polished with No. 1000, No. 1500 and No. 2000 sandpaper respectively, and then cleaned with distilled water and absolute ethanol, dried and set aside;

[0043] Weigh 70% Si powder, 15% C powder and 15% Al respectively according to mass fraction 2 o 3 Powder ball milling for 5 hours to make embedding powder, put half of the prepared embedding powder into the graphite crucible, put the treated carbon / carbon composite material, and then use the other half of the embedding powder to mix the carbon / carbon Cover with composite material and cover with graphite lid; put the graphite crucible into the vertical vacuum furnace of the graphite heating element, and the vacuum degree reaches 5×10 -3 After Pa, a protective gas with a flow rate of 550ml / min was introduced, and the furnace temperature was raised to 1800°C at a heating rate of 10°C / min, kept for 3 hours, and then the furnace temperature was lowered to 12...

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Abstract

A charcoal / charcoal composite material ablation-resisting coating and a preparing process thereof are disclosed. The coating comprises a SiC transition coating and a tungsten spraying coating. The surface layer of a substrate is covered with the SiC transition coating. The SiC transition coating is coated with the tungsten spraying coating. The SiC transition coating comprises 70-80% by mass of Si powder, 10-20% by mass of C powder and 5-15% by mass of Al2O3 powder. The preparing process includes subjecting the substrate to surface treatment, preparing the SiC transition coating, screening a tungsten powder material, preparing a tungsten coating / SiC / charcoal / charcoal composite material, relieving stress of a tungsten coating / SiC / charcoal / charcoal composite material coating, and subjecting the coating to ablation performance testing by adopting an oxyacetylene flame ablating device. According to the charcoal / charcoal composite material ablation-resisting coating and the preparing process, oxyacetylene flame ablation resisting time of a charcoal / charcoal composite material at about 2800 DEG C is prolonged from 10 s to 120 s and the coating does not shed.

Description

technical field [0001] The invention relates to the field of materials, in particular to a carbon / carbon composite material ablation-resistant coating and a preparation process thereof. Background technique [0002] Carbon / carbon composites have become one of the preferred materials for ramjet nozzle throat linings due to their excellent properties such as low density, high specific strength, ablation resistance and thermal shock resistance. However, the carbon / carbon composite material begins to oxidize above 400°C in the air. The oxidation process is accompanied by the flow of oxygen in the gas medium, and under the catalysis of impurity particles, it diffuses from the material boundary through the internal pores of the material to the interior, resulting in strength and The rapid attenuation of other mechanical properties, and the weight loss of oxidation is 1%, and its strength drops by 10%. Therefore, it is difficult for pure carbon / carbon composites to withstand the er...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/83C04B41/4517C04B41/4545C04B41/455C04B41/5059C04B41/4547C04B41/4527C04B41/5133
Inventor 周哲易茂中葛毅成汪沅龚洁明吴皇冉丽萍
Owner CENT SOUTH UNIV
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