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Preparation method of a high-temperature anti-oxidation and ablation-resistant non-oxide-based dense coating

A high-temperature anti-oxidation and non-oxidation technology, which is applied in the field of composite materials and coating preparation, can solve the problems of rough surface, low particle distribution uniformity, high melting point and difficult sintering, etc. Density and cohesion, and the effect of improving anti-oxidation and ablation resistance

Active Publication Date: 2021-02-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high melting point of zirconium diboride and silicon carbide powder, it is difficult to sinter, and the sintering treatment cannot effectively improve the compactness and mechanical strength of the powder.
The powder obtained through the above process generally has a loose structure, rough surface and low strength. During the coating preparation process, the powder is easily broken and difficult to melt during transportation.
At the same time, due to the large particle size of the raw material powder, the anti-oxidation ablation coating prepared by the atmospheric plasma spraying system has problems such as many voids and loose structure, and the distribution uniformity of the particles on the microscopic scale is low, which is not conducive to the coating's ablation resistance. Corrosion performance maintenance

Method used

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  • Preparation method of a high-temperature anti-oxidation and ablation-resistant non-oxide-based dense coating
  • Preparation method of a high-temperature anti-oxidation and ablation-resistant non-oxide-based dense coating
  • Preparation method of a high-temperature anti-oxidation and ablation-resistant non-oxide-based dense coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Add 191.5g of zirconium diboride, 43g of silicon carbide, 15.5g of lanthanum oxide, 0.75g of PVA and 375g of deionized water into the ball milling tank with a ball-to-material ratio of 4:1, and ball mill for 4 hours at 200r / min. Mix the ingredients evenly to obtain a suspension;

[0046] (2) Transfer the suspension to a spray drying granulation tower for spray granulation. The granulated powder is first dried in an oven at 100°C for 15 hours, and then passed through a test sieve to obtain a powder with a particle size of 20 μm to 90 μm. ZrB 2 -SiC-La 2 o 3 agglomerated powder;

[0047] Among them, spray drying and granulation process parameters: inlet temperature 280°C, outlet temperature 110°C, nozzle speed 25Hz, peristaltic pump speed 35rpm;

[0048] (3) ZrB 2 -SiC-La 2 o 3 The agglomerated powder is sent to the induction plasma spheroidization equipment for spheroidization treatment, and the spheroidized powder passes through the inspection sieve to obtain...

Embodiment 2

[0055] (1) Add 179.25g of zirconium diboride, 40.25g of silicon carbide, 30.5g of lanthanum oxide, 1g of PVA and 375g of deionized water into the ball milling tank with a ball-to-material ratio of 4:1, and ball mill at 300r / min for 5h. Mix the ingredients evenly to obtain a suspension;

[0056] (2) Transfer the suspension to a spray drying granulation tower for spray granulation. The granulated powder is first dried in an oven at 120°C for 15 hours, and then passed through a test sieve to obtain a powder with a particle size of 20 μm to 90 μm. ZrB 2 -SiC-La 2 o 3 agglomerated powder;

[0057] Among them, spray drying granulation process parameters: inlet temperature 290°C, outlet temperature 120°C, nozzle speed 30Hz, peristaltic pump speed 35rpm;

[0058] (3) ZrB 2 -SiC-La 2 o 3 The agglomerated powder is sent to the induction plasma spheroidization equipment for spheroidization treatment, and the spheroidized powder passes through the inspection sieve to obtain ZrB wit...

Embodiment 3

[0065](1) Add 167.5g of zirconium diboride, 37.5g of silicon carbide, 45g of lanthanum oxide, 1.25g of PVA and 375g of deionized water into the ball mill tank with a ball-to-material ratio of 5:1, and ball mill at 400r / min for 5h, Mix the ingredients evenly to obtain a suspension;

[0066] (2) Transfer the suspension to a spray drying granulation tower for spray granulation. The granulated powder is first dried in an oven at 140°C for 18 hours, and then passed through a test sieve to obtain a powder with a particle size of 20 μm to 90 μm. ZrB 2 -SiC-La 2 o 3 agglomerated powder;

[0067] Among them, spray drying granulation process parameters: inlet temperature 320°C, outlet temperature 130°C, nozzle speed 35Hz, peristaltic pump speed 40rpm;

[0068] (3) ZrB 2 -SiC-La 2 o 3 The agglomerated powder is sent to the induction plasma spheroidization equipment for spheroidization treatment, and the spheroidized powder passes through the inspection sieve to obtain ZrB with a p...

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Abstract

The invention relates to a method for preparing a high-temperature anti-oxidation and ablation-resistant non-oxide-based dense coating, which belongs to the technical field of composite materials and coating preparation. In the method of the present invention, submicron-level powders are selected as raw materials, combined with spray granulation and plasma spheroidization technology to obtain ZrB with good sphericity, high density, good fluidity, and high bulk density. 2 ‑SiC‑La 2 o 3 The powder for plasma spraying is prepared by plasma spraying technology to obtain a high-density coating. This coating can withstand the ablation test for 300s at a surface temperature of 2000°C, and can meet the application requirements in a high-temperature aerobic ablation environment.

Description

technical field [0001] The invention specifically relates to a method for preparing a high-temperature anti-oxidation and ablation-resistant non-oxide-based dense coating, which belongs to the technical field of composite materials and coating preparation. Background technique [0002] Carbon fiber reinforced carbon matrix composites (C / C) have high specific strength, high specific modulus, corrosion resistance, high temperature resistance, low density, and good high temperature mechanical and thermal properties. They are ideal thermal structural materials in the aerospace field. However, in the face of the high temperature, high pressure, high speed, and oxygen-containing working environment of the aircraft in service, the carbonaceous materials in the carbon matrix composites are easily oxidized (the aerobic environment above 400°C begins to be oxidized), and the performance of the material is difficult to grow. time keeping. Aiming at the problem of high-temperature oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
CPCC04B41/009C04B41/507C04B41/85C04B41/5059C04B41/5045C04B41/4543C04B35/83
Inventor 朱时珍李奕臻柳彦博马壮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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