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HfO2/HfB2 composite ceramic coating with high infrared emissivity and preparation method of HfO2/HfB2 composite ceramic coating

A technology of infrared emissivity and ceramic coating, applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of limited compound application, complicated preparation process, expensive price, etc. Good capacitance and energy saving effect

Active Publication Date: 2020-10-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

HfB 2 The melting point is 3380°C, it has excellent thermochemical stability, has certain oxidation resistance below 2200°C, and has good thermal shock resistance, can maintain high strength at high temperatures, and has better near-infrared band Its infrared radiation performance is widely used in wear-resistant coatings, refractory materials, aerospace thermal protection and other fields, so it is considered as a dopant to enhance HfO 2 Infrared thermal radiation performance, but HfB 2 It is expensive in itself, its preparation process is complicated, the cost is high, and it is easy to mix with impurities that are difficult to remove, which limits its compatibility with HfO 2 Composite application of

Method used

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  • HfO2/HfB2 composite ceramic coating with high infrared emissivity and preparation method of HfO2/HfB2 composite ceramic coating
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  • HfO2/HfB2 composite ceramic coating with high infrared emissivity and preparation method of HfO2/HfB2 composite ceramic coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Provide a HfO 2 / HfB 2 The preparation method of composite high infrared emissivity ceramic coating comprises the following steps:

[0034] 1) With 92wt% HfO 2 Powder and 8wt% B 4 C powder is the raw material, adding deionized water and binder polyvinyl alcohol to mix and grind to obtain a uniform slurry, wherein the binder is the raw material HfO 2 and B 4 3% of C mass, the volume ratio of deionized water and mixed raw materials is 1.2:1;

[0035]2) The powder with high sphericity is obtained by spray granulation method. During spray granulation, the temperature of the drying tower is 200°C, and the rotation speed of the material pump is 3000r / min; the particle size is 45-75μm by standard sieve screening. HfO 2 / B 4 C composite agglomerated powder;

[0036] 3) HfO was sprayed by plasma spraying 2 / B 4 C composite agglomerated powder was sprayed onto a preheated stainless steel substrate to obtain HfO 2 / HfB 2 Composite high-infrared emissivity ceramic coati...

Embodiment 2

[0040] Provide a HfO 2 / HfB 2 The preparation method of composite high infrared emissivity ceramic coating comprises the following steps:

[0041] 1) With 95wt% HfO 2 powder and 5wt% B 4 C powder is used as raw material, adding deionized water and self-made binder to mix and grind to obtain a uniform slurry, wherein the binder is raw material HfO 2 and B 4 3% of C mass, the volume ratio of deionized water and mixed raw materials is 1.5:1;

[0042] 2) Use the spray granulation method to obtain powder with high sphericity. During spray granulation, the temperature of the drying tower is 200°C, and the speed of the material pump is 2500r / min; the particle size is 45-75μm by standard sieve screening. HfO 2 / B 4 C composite agglomerated powder;

[0043] 3) HfO was sprayed by plasma spraying 2 / B 4 C composite agglomerated powder was sprayed onto a preheated stainless steel substrate to obtain HfO 2 / HfB 2 Composite high infrared emissivity ceramic coating, where the spr...

Embodiment 3

[0046] Provide a HfO 2 / HfB 2 The preparation method of composite high infrared emissivity ceramic coating comprises the following steps:

[0047] 1) With 98wt% HfO 2 powder and 2wt% B 4 C powder is used as raw material, adding deionized water and self-made binder to mix and grind to obtain a uniform slurry, wherein the binder is raw material HfO 2 and B 4 3% of C mass, the volume ratio of deionized water and mixed raw materials is 1.3:1;

[0048] 2) Use the spray granulation method to obtain powder with high sphericity. When spray granulation, the temperature of the drying tower is 180°C, and the rotation speed of the material pump is 3500r / min; the particle size is 45-75μm through standard sieve screening. HfO 2 / B 4 C composite agglomerated powder;

[0049] 3) HfO was sprayed by plasma spraying 2 / B 4 C composite agglomerated powder was sprayed onto a preheated stainless steel substrate to obtain HfO 2 / HfB 2 Composite high-infrared emissivity ceramic coating, w...

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Abstract

The invention discloses an HfO2 / HfB2 composite ceramic coating with high infrared emissivity and a preparation method of the HfO2 / HfB2 composite ceramic coating. The preparation method comprises the following steps that HfO2 and B4C are taken as raw materials, deionized water and a binder are added, grinding and mixing are conducted, then spray granulation is carried out, and HfO2 / B4C composite agglomerated powder is obtained through screening; an atmospheric plasma spraying process is used for directly spraying the composite agglomerated powder to the surface of a to-be-sprayed part, in the atmospheric plasma spraying process, auxiliary gas of ionic gas contains H2, in a spraying process, the raw materials react with the H2 to generate HfB2, CO2 and water vapor, gas overflows, and namelythe HfO2 / HfB2 composite ceramic coating with the high infrared emissivity is obtained. The ceramic coating is simple in preparation process, can be directly obtained in the spraying process, does notneed to be additionally added with a reducing agent, does not need a high-temperature roasting process, is short in synthesis time and low in energy consumption, is high in purity and infrared emissivity in the ceramic coating, and can be applied to an ultra-high-temperature vacuum environment at 2000 DEG C.

Description

technical field [0001] The invention belongs to the technical field of infrared thermal radiation coating, and in particular relates to a HfO 2 / HfB 2 Composite high infrared emissivity ceramic coating and preparation method thereof. Background technique [0002] The rocket engine is the core power plant of the space vehicle. As the engine develops towards high thrust-to-weight ratio and high specific impulse, the temperature of its thrust chamber is also increasing. According to reports, the temperature of the thrust chamber of the most advanced Re-Ir rocket engine currently exceeds 2000°C. In order to ensure the stability of the engine and prevent the thrust chamber from overheating or even burning out, it is necessary to improve its heat dissipation performance. Commonly used engine cooling methods include liquid film cooling and radiation cooling, but the inefficient combustion of the cooling liquid film will seriously affect the performance of the engine and reduce ...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/10
CPCC23C4/134C23C4/10
Inventor 曾鲜佟旭张毅王浩宇杨化雨
Owner WUHAN UNIV OF TECH
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