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Preparation method of multi-component-doping modified zirconium diboride-silicon carbide coating

A technology of silicon carbide coating and zirconium diboride, which is applied in the field of preparation of multi-component doped modified zirconium diboride-silicon carbide coating, can solve the problem of anti-oxidation ablation coating with many voids and spherical powder surface roughness , Powder is easy to break and other problems, to achieve the effect of good thermal radiation performance, good fluidity, high bulk density

Active Publication Date: 2019-11-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the powder obtained through the above-mentioned process has not been calcined and densified, and the surface of the spherical powder is generally loose, rough, and low in strength. During the coating preparation process, the powder is easily broken and difficult to melt during transportation; and The anti-oxidation ablation coating prepared by atmospheric plasma spraying system has problems such as many voids and loose structure

Method used

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  • Preparation method of multi-component-doping modified zirconium diboride-silicon carbide coating
  • Preparation method of multi-component-doping modified zirconium diboride-silicon carbide coating
  • Preparation method of multi-component-doping modified zirconium diboride-silicon carbide coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Add 75g of zirconium diboride powder, 25g of silicon carbide powder, 25g of molybdenum disilicide powder, 25g of tantalum disilicide powder, 0.75g of PVA and 375g of deionized water into the ball mill tank. 4:1, ball milling at 100r / min for 6h to mix the ingredients evenly to obtain a suspension;

[0040] (2) Transfer the suspension to a spray drying granulation tower for agglomeration and granulation. The granulated powder is first dried in an oven at 80°C for 30 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-MoSi 2 -TaSi 2 agglomerated powder;

[0041] Among them, spray drying granulation process parameters: inlet temperature 210°C, outlet temperature 100°C, nozzle speed 25Hz, peristaltic pump speed 35rpm;

[0042] (3) ZrB 2 -SiC-MoSi 2 -TaSi 2 The agglomerated powder is sent to the induction plasma spheroidization equipment for spheroidization treatment, and then passed through the inspecti...

Embodiment 2

[0048] (1) Add 80g of zirconium diboride powder, 20g of silicon carbide powder, 20g of molybdenum disilicide powder, 20g of tantalum disilicide powder, 0.56g of PVA and 350g of deionized water into the ball mill tank. 4:1, ball milling at 400r / min for 2h to mix the ingredients evenly to obtain a suspension;

[0049] (2) Transfer the suspension to a spray drying granulation tower for agglomeration and granulation. The granulated powder is first dried in an oven at 150°C for 20 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-MoSi 2 -TaSi 2 agglomerated powder;

[0050] Among them, spray drying granulation process parameters: inlet temperature 350°C, outlet temperature 130°C, nozzle speed 45Hz, peristaltic pump speed 50rpm;

[0051] (3) ZrB 2 -SiC-MoSi 2 -TaSi 2 The agglomerated powder is sent to the induction plasma spheroidization equipment for spheroidization treatment, and then passed through the inspect...

Embodiment 3

[0057] (1) Add 100g of zirconium diboride powder, 20g of silicon carbide powder, 20g of molybdenum disilicide powder, 20g of tantalum disilicide powder, 0.48g of PVA and 400g of deionized water into the ball mill tank, and the ball-to-material ratio is 4:1, ball milling at 300r / min for 4h to mix the ingredients evenly to obtain a suspension;

[0058] (2) Transfer the suspension to a spray drying granulation tower for agglomeration and granulation. The granulated powder is first dried in an oven at 120°C for 25 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-MoSi 2 -TaSi 2 agglomerated powder;

[0059] Among them, spray drying granulation process parameters: inlet temperature 270°C, outlet temperature 120°C, nozzle speed 30Hz, peristaltic pump speed 40rpm;

[0060] (3) ZrB 2 -SiC-MoSi 2 -TaSi 2 The agglomerated powder is sent to the induction plasma spheroidization equipment for spheroidization treatment, ...

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Abstract

The invention relates to a preparation method of a multi-component-doping modified zirconium diboride-silicon carbide coating, and belongs to the technical field of composite powder and coating preparation. The method comprises the following steps: preparing ZrB2-SiC agglomerated powder doped with MoSi2 and TaSi2 through spray granulation and induction plasma spheroidization, and forming a coatingon a substrate by adopting an atmospheric plasma spraying process. By doping MoSi2 and TaSi2 at the same time, firstly, the two components serve as low-melting-point phases to fill pores and cracks in the powder, so that the compactness of the coating is improved; secondly, the two components serve as high-emissivity components to effectively radiate out heat in the coating, so that the high-temperature resistance of the coating is improved. The coating has good temperature resistance, infrared radiation performance, oxidation resistance, scouring resistance and thermal shock resistance. Thecoating can bear 300s oxyacetylene ablation examination at the surface temperature of 2000 DEG C and breaks through the technical bottleneck of 1800 DEG C.

Description

technical field [0001] The invention relates to a method for preparing a multi-component doped modified zirconium diboride-silicon carbide coating, which belongs to the technical field of composite powder and coating preparation. Background technique [0002] Carbon fiber reinforced carbon matrix composites (C / C) have low density, low thermal expansion coefficient at high temperature and good mechanical properties. It is easily oxidized in an oxygen environment, resulting in a decrease in its performance. One of the effective methods is to prepare an anti-oxidation ablation coating on its surface. [0003] Zirconium diboride (ZrB 2 ) is a hexagonal metalloid structure compound, which has the advantages of high melting point (3040°C), high hardness and excellent chemical stability. Silicon carbide (SiC) has the advantages of high strength, high hardness, and low thermal expansion coefficient. ZrB 2 -SiC is a typical ultra-high temperature ceramic coating system, which can...

Claims

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Application Information

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IPC IPC(8): C04B41/85C04B35/83C04B35/80C04B35/565
CPCC04B41/009C04B41/5071C04B41/85C04B41/507C04B41/5059C04B41/4545C04B35/83C04B35/806C04B35/565C04B35/80
Inventor 柳彦博朱时珍马壮李奕臻辜思聪郭嘉仪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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