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Hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite coating and preparation method thereof

A technology of tantalum disilicide and hafnium diboride, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of low high-temperature emissivity of oxidation products, improvement of coating oxidation rate, and coating oxygen barrier ability Dropping and other problems, to achieve the effect of retaining the characteristics of powder materials, reducing coating defects, and improving the compactness of the coating

Active Publication Date: 2022-03-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the temperature rises, the problem of low high-temperature emissivity of its oxidation products begins to emerge. The coating rapidly accumulates a large amount of heat energy during its service, and the surface of the coating rises to a very high temperature in a short period of time, making the coating The medium-dense borosilicate glass oxygen barrier layer vaporizes rapidly, resulting in a decrease in the oxygen barrier capacity of the coating, causing a sharp increase in the oxidation rate of the coating, exceeding the service limit of the coating, resulting in complete deterioration and functional degradation of the coating in a relatively short period of time. Loss of protection against base material

Method used

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  • Hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite coating and preparation method thereof
  • Hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite coating and preparation method thereof
  • Hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite coating and preparation method thereof

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preparation example Construction

[0031] The invention provides a preparation method of hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite coating, comprising the following steps:

[0032] Preheat the substrate, and spray the hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite powder on the surface of the preheated substrate by atmospheric plasma spraying to obtain the hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite coating layer;

[0033] The hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite powder is in a molten eutectic state, and its components include the following components in volume percentage:

[0034]

[0035] In the present invention, the substrate is preheated first. In the present invention, the matrix is ​​preferably a matrix that requires high-temperature anti-oxidation protection on the surface; further, the matrix is ​​preferably a carbon fiber-reinforced carbon-matrix com...

Embodiment 1

[0088] (1) Add 1150g of hafnium diboride, 75g of silicon carbide, 214g of tantalum disilicide, 61g of gadolinium oxide, 7.5g of PVA and 2250g of deionized water into the ball mill tank with a ball-to-material ratio of 4:1, and ball mill at 250r / min 3h, make each component mix uniformly, obtain the suspension of precursor powder;

[0089] (2) Transfer the suspension obtained in step (1) 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 granules. HfB with diameter2 -SiC-TaSi 2 -Gd 2 o 3 Agglomerated powder (HfB 2 , SiC, TaSi 2 、Gd 2 o 3 The volume ratio is 66.5:14.25:14.25:5);

[0090] Among them, the spray drying granulation parameters are: inlet temperature 250°C, outlet temperature 130°C, nozzle speed 35Hz, peristaltic pump speed 30rpm;

[0091] (3) HfB 2 -SiC-TaSi 2 -Gd 2 o 3The agglomerated powder is sent to the induction plas...

Embodiment 2

[0102] (1) Add 1101g of hafnium diboride, 72g of silicon carbide, 204g of tantalum disilicide, 123g of gadolinium oxide, 7.5g of PVA and 2250g of deionized water into the ball mill tank with a ball-to-material ratio of 4:1, and ball mill at 400r / min 2h, make each component mix uniformly, obtain the suspension of precursor powder;

[0103] (2) Transfer the suspension obtained in step (1) 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 granules. HfB with diameter2 -SiC-TaSi 2 -Gd 2 o 3 Agglomerated powder (HfB 2 , SiC, TaSi 2 、Gd 2 o 3 The volume ratio is 63:13.5:13.5:10);

[0104] Among them, the spray drying granulation parameters are: inlet temperature 250°C, outlet temperature 130°C, nozzle speed 35Hz, peristaltic pump speed 35rpm;

[0105] (3) HfB 2 -SiC-TaSi 2 -Gd 2 o 3 The agglomerated powder is sent to the induction plas...

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Abstract

The invention provides a hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite coating and a preparation method thereof, and belongs to the technical field of composite coatings. According to the invention, hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite powder is used as a raw material of the coating, so that not only is relatively strong high-temperature oxidation resistance of hafnium diboride-silicon carbide of a traditional system maintained, but also crystal transformation of an oxide is stabilized and a glass phase is supplemented by using a tantalum disilicide adding phase; and the gadolinium oxide adding phase is used for improving the overall emissivity of the coating and enhancing the viscosity of the glass phase, so that the high-temperature oxygen corrosion resistance of the coating is further improved. The coating is prepared in an atmospheric plasma spraying mode, the method has the advantages of being simple in process, easy to control, high in production efficiency, low in cost and the like, and meanwhile the characteristics that the thickness of the coating is controllable, the defects of the coating are reduced, the compactness of the coating is improved, and the characteristics of a powder material are reserved to the maximum degree can be achieved.

Description

technical field [0001] The invention relates to the technical field of composite powder materials, in particular to a hafnium diboride-silicon carbide-tantalum disilicide-gadolinium oxide composite coating and a preparation method thereof. Background technique [0002] Carbon fiber reinforced carbon matrix composites (C / C) have the characteristics of low density, low thermal expansion coefficient at high temperature and excellent mechanical properties, and are regarded as one of the most promising materials for application in aircraft hot-end parts. However, in an aerobic environment above 400 °C, carbon fiber reinforced carbon matrix composites are easily oxidized, resulting in reduced performance. One of the effective methods is to prepare an anti-oxidation ablation coating on its surface. [0003] The existing anti-oxidation ablation coating material is HfB 2 / SiC ceramic composite materials. However, as the temperature rises, the problem of low high-temperature emissi...

Claims

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Application Information

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IPC IPC(8): C04B41/87C23C4/134C23C4/10
CPCC04B41/87C04B41/009C04B41/5071C23C4/134C23C4/10C04B35/83C04B41/507C04B41/5059C04B41/5045C04B41/4527
Inventor 柳彦博谢明劭刘少璞王一帆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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