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Carbon/carbon composite surface mosaic sic-zrb 2 -zrsi 2 Preparation method of composite anti-oxidation coating

A carbon composite material and anti-oxidation coating technology, which is applied in the field of anti-oxidation coating preparation, can solve the problems of difficult sintering, less particles, and insufficient density of the coating, and achieve the effect of improving the bonding force and improving the compactness

Active Publication Date: 2021-02-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the ZrB 2 Ceramics are difficult to sinter, and the prepared coatings are often not dense enough
In addition, ZrB in the coating prepared by the traditional embedding method 2 The content is less and the particles are easy to agglomerate [X.Y.Yao, H.J.Li, Y.L.Zhang, H.Wu, X.F.Qiang, A SiC-Si-ZrB 2 multiphase oxidation protective ceramic coating for SiC-coated carbon / carbon composites, Ceram.Int.38(2012) 2095-2100.]

Method used

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  • Carbon/carbon composite surface mosaic sic-zrb <sub>2</sub> -zrsi <sub>2</sub> Preparation method of composite anti-oxidation coating
  • Carbon/carbon composite surface mosaic sic-zrb <sub>2</sub> -zrsi <sub>2</sub> Preparation method of composite anti-oxidation coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Choose commercially available ZrB 2 and ZrSi 2 Powder, after dry ball milling for 24 hours, the average particle size is controlled at about 5 μm, iodine element, purity ≥ 99.7%, and isopropanol, purity ≥ 99.8% are raw materials;

[0033] (2) Pre-oxidize the C / C composite material in a muffle furnace at 900°C for 3 minutes;

[0034] (3) Take an appropriate amount of ZrB 2 Powder, ZrSi 2 Powder, control the mass ratio of the two: ZrSi 2 Powder: 30wt%, ZrB 2 Powder: 70wt%, dispersed in a conical flask filled with 170mL of isopropanol, prepared into a suspension with a concentration of 30g / L, then put the suspension into an ultrasonic generator to vibrate for 60min, and put it into a magnetic rotor after taking it out , placed on a magnetic stirrer and stirred for 12 hours to obtain suspension A;

[0035] (4) Add elemental iodine to the suspension A to obtain a mixture. The concentration of iodine in the mixture is 3g / L. After sealing the conical flask, place it ...

Embodiment 2

[0042] (1) Choose commercially available ZrB 2 and ZrSi 2 Powder, after dry ball milling for 36 hours, the average particle size is controlled at about 3 μm, iodine element, purity ≥ 99.7%, and isopropanol, purity ≥ 99.8% are raw materials;

[0043] (2) Pre-oxidize the C / C composite material in a muffle furnace at 600°C for 10 minutes;

[0044] (3) Take an appropriate amount of ZrB 2 Powder, ZrSi 2 Powder, control the mass ratio of the two: ZrSi 2 Powder: 20wt%, ZrB 2 Powder: 80wt%, dispersed in an Erlenmeyer flask filled with 150mL of isopropanol, prepared into a suspension with a concentration of 20g / L, then put the suspension into an ultrasonic generator and vibrated for 30min, took it out and put it into a magnetic rotor , placed on a magnetic stirrer and stirred for 8 hours to obtain suspension A;

[0045] (4) Add iodine elemental substance to the suspension A to obtain a mixture. The concentration of iodine in the mixture is 4g / L. After sealing the conical flask, p...

Embodiment 3

[0052] (1) Choose commercially available ZrB 2 and ZrSi 2 Powder, after dry ball milling for 48 hours, the average particle size is controlled at 1 μm, iodine element, purity ≥ 99.7%, and isopropanol, purity ≥ 99.8% are raw materials;

[0053] (2) Pre-oxidize the C / C composite material in a muffle furnace at 800°C for 5 minutes;

[0054] (3) Take an appropriate amount of ZrB 2 Powder, ZrSi 2 Powder, control the mass ratio of the two: ZrSi 2 Powder: 40wt%, ZrB 2 Powder: 60wt%, dispersed in a conical flask filled with 160mL of isopropanol, prepared into a suspension with a concentration of 10g / L, then put the suspension into an ultrasonic generator and vibrated for 30min, took it out and put it into a magnetic rotor , placed on a magnetic stirrer and stirred for 10 hours to obtain suspension A;

[0055] (4) Add elemental iodine to the suspension A to obtain a mixture. The concentration of iodine in the mixture is 5g / L. After sealing the conical flask, place it on a magneti...

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Abstract

The invention relates to a carbon / carbon composite surface embedded SiC-ZrB 2 ‑ZrSi 2 The preparation method of the composite anti-oxidation coating is to prepare a multi-phase mosaic ultra-high temperature ceramic coating by using the hydrothermal electrophoretic deposition method combined with the solid infiltration method. In this artificially constructed multi-phase coating system coating, ZrB 2 , ZrSi 2 The content is more and the distribution is even. The solid infiltration method generates a SiC buffer layer through the infiltration of Si and the reaction of the C / C composite matrix, which improves the bonding force between the coating and the matrix. On the other hand, the Si powder in the embedding powder reacts with the C powder to form SiC, SiC to ZrB 2 ‑ZrSi 2 The filling of the porous layer and the sintering at high temperature improve the overall compactness of the coating. SiC-ZrB of the present invention 2 ‑ZrSi 2 The composite anti-oxidation coating is well combined with the substrate and has excellent thermal shock resistance and oxidation resistance. After 50 thermal cycles from room temperature to 1500 °C, the coating sample has a weight gain of 15.2 g m ‑2 . After oxidation at 1500°C for 580 hours, the weight loss per unit area is only 15.6g m ‑2 .

Description

technical field [0001] The invention belongs to the technical field of anti-oxidation coating preparation, and relates to a carbon / carbon composite surface embedded SiC-ZrB 2 -ZrSi 2 A method for preparing a composite anti-oxidation coating, in particular to a method for preparing SiC-ZrB with a mosaic structure by combining a hydrothermoelectrophoretic deposition method with a solid infiltration method 2 -ZrSi 2 Method for composite anti-oxidation coating. Background technique [0002] Carbon / carbon composite material is a kind of all-carbon composite material in which the matrix phase and the reinforcing phase are the same element. Because it is only composed of a single carbon element, it not only has excellent ablation resistance of carbon and graphite materials, but also has low density, Low thermal expansion coefficient and other advantages, but also excellent mechanical properties, such as high strength, high modulus, good fracture toughness and wear resistance, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/5071C04B41/87C04B35/83C04B41/507C04B41/5059C04B41/4564C04B41/4539C04B41/4545
Inventor 付前刚周磊童明德续润洲张佩
Owner NORTHWESTERN POLYTECHNICAL UNIV