High-emissivity and high-entropy ceramic powder material and coating preparation method

A high-emissivity, ceramic powder technology, applied in the field of high-temperature protective materials and coatings, can solve the problems of chromium oxide evaporation, limited emissivity, inability to meet the operating temperature, etc., to achieve complete coating, excellent emissivity test results, The effect of broad application prospects

Active Publication Date: 2021-05-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cr 2 o 3 The base ceramic coating has high emissivity and can operate stably at temperatures below 1100°C. However, it will fail in a short period of time at higher temperatures. The main reason is that chromium oxide will evaporate when the operating temperature exceeds 1100°C.
Single-component coating materials can no longer meet the rising service temperature, and the emissivity in high-temperature environments is very limited

Method used

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  • High-emissivity and high-entropy ceramic powder material and coating preparation method
  • High-emissivity and high-entropy ceramic powder material and coating preparation method
  • High-emissivity and high-entropy ceramic powder material and coating preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] In this embodiment, a high-emissivity high-entropy ceramic coating is sprayed on the surface of the aircraft skin, and the specific steps are as follows:

[0044] Step 1: Add Cr 2 o 3 , NiO, TiO 2 、Sm 2 o 3 and Al 2 o 3 The powder is mixed and prepared, adding absolute ethanol to the mixed powder, pouring it into a planetary ball mill and grinding it for 8 hours, and putting the ground ceramic powder into a dryer for 24 hours to obtain a high-emissivity high-entropy ceramic powder material. In terms of weight percentage, the chemical composition and impurity content of the high-emissivity high-entropy ceramic powder material are as follows: NiO 22%, TiO 2 9%, Sm 2 o 3 2%, Al 2 o 3 3%, Fe 2 o 3 0.12%, SiO 2 0.15%, CaO0.08%, Cr 2 o 3 margin.

[0045] Step 2: Fill the dried powder into a mold with a length and width of 150mm×50mm, use a powder briquetting machine to press and shape the powder, and the pressing strength is 20-22MPa to obtain a ceramic b...

Embodiment 2

[0055] In this embodiment, thermal shock and emissivity tests are carried out on the high-emissivity high-entropy ceramic coating prepared in Example 1:

[0056] Step 1: Thermal shock performance test: Adjust the temperature of the box-type resistance furnace to 1150±10°C, and spray the high-emissivity and high-entropy ceramic coating test piece according to the same process parameters as in Example 1; place the test piece in the uniform temperature of the resistance furnace Zone, keep warm for 5min, then put the test piece into water at room temperature 25°C, then put the test piece back into the resistance furnace to start the next cycle; image 3 As shown in the photos before and after thermal shock, after 30 cycles, the coating has no defects such as separation, cracks, peeling and peeling, indicating that the temperature resistance of the coating exceeds 1100 °C.

[0057] Step 2: Calibration of phase structure: Carry out X-ray diffraction test on the high-emissivity high-...

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Abstract

The invention relates to the field of high-temperature protection materials and coatings, in particular to a high-emissivity and high-entropy ceramic powder material and a coating preparation method, which are beneficial to efficient heat dissipation so as to avoid overtemperature failure of a base material. A high-emissivity and high-entropy ceramic powder material with the component of CraNibTixSmyAl(1-a-b-x-y)O(3+x-b) / 2 (the subscript is the atomic ratio) is designed through the high-entropy idea, spraying powder is prepared through the method of solid-phase sintering and mechanical crushing, and the high-emissivity coating is prepared through atmosphere plasma spraying. The temperature resistance of the high-emissivity coating of the component system exceeds 1100 DEG C, the phenomena of coating stripping, peeling and the like are avoided after the coating is circulated for more than 30 times under the conditions of 1150 DEG C*5 min and water quenching, the emissivity at the room temperature reaches 0.96, and the emissivity at the 1200 DEG C reaches 0.92.

Description

technical field [0001] The invention relates to the field of high-temperature protective materials and coatings, and specifically relates to a high-emissivity high-entropy ceramic powder material and a preparation method for coatings. The obtained materials and coatings can be applied to high-temperature walls such as aircraft shells and medical targets. Helps to dissipate heat efficiently to avoid overheating failure of the base material. Background technique [0002] There are many kinds of ceramic coatings, which are widely used in a wide range of fields. Among them, there is a type of high-emissivity coating, which is usually coated on high-temperature wall surfaces to promote surface heat dissipation and protect the substrate. High emissivity coating materials are mainly composed of refractory materials, high emissivity additives and binders. Typical refractory materials include zirconia, alumina, silica, etc.; typical high emissivity additives are mainly transition met...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622C04B35/626
CPCC04B35/01C04B35/62222C04B35/62605C04B2235/3208C04B2235/3217C04B2235/3224C04B2235/3232C04B2235/3272C04B2235/3279C04B2235/3418
Inventor高明浩栾胜家王远鸿周恬伊朱宏博常辉徐娜张甲侯万良常新春
OwnerINST OF METAL RESEARCH - CHINESE ACAD OF SCI