Low-thermal-conductivity high-entropy ceramic thermal barrier coating material

A technology of thermal barrier coating and low thermal conductivity, which is applied in the field of high-entropy ceramic materials, can solve the problems of poor thermal stability, poor matching of thermal expansion coefficients, and high thermal conductivity of thermal barrier coating materials, so that it is not easy to agglomerate, Effect of reducing thermal conductivity

Active Publication Date: 2022-03-08
INNER MONGOLIA UNIV OF TECH
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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to provide a low thermal conductivity high-entropy ceramic thermal barrier coating material with a hollow spherical structure to solve the problem of the relatively high thermal conductivity of the thermal barrier coating material and the incompatibility with the substrate. The matching degree of the thermal expansion coefficient and poor thermal stability of the

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  • Low-thermal-conductivity high-entropy ceramic thermal barrier coating material

Examples

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Embodiment 1

[0039] In this example, the low thermal conductivity and high entropy ceramic thermal barrier coating material is prepared by the following steps:

[0040] Step A: Preparation of high-entropy ceramic powder: using nitrate of trivalent rare earth elements and acetate of tetravalent metal elements as raw materials, a high-entropy ceramic powder with a hollow spherical structure is prepared by a plasma spraying process; this embodiment The chemical formula of the high-entropy ceramic powder used is (La 1 / 5 SM 1 / 5 Gd 1 / 5 Nd 1 / 5 Yb 1 / 5 ) 2 Zr 2 o 7 , the preparation method of high-entropy ceramic powder comprises the steps:

[0041] Step (A-1): La(NO 3 ) 3 ·6H 2 O, Sm(NO 3 ) 3 ·6H 2 O, Gd(NO 3 ) 3 ·6H 2 O, Nd(NO 3 ) 3 ·6H 2 O and Yb(NO 3 ) 3 ·6H 2 O five kinds of nitrates are fully mixed according to the molar ratio of 1:1:1:1:1, then add an appropriate amount of deionized water to dissolve to obtain a mixed nitrate solution, and then mix the mixed nitrate sol...

Embodiment 2

[0051] In this example, the low thermal conductivity and high entropy ceramic thermal barrier coating material is prepared by the following steps:

[0052] Step A: Preparation of high-entropy ceramic powder: using nitrate of trivalent rare earth elements and acetate of tetravalent metal elements as raw materials, a high-entropy ceramic powder with a hollow spherical structure is prepared by a plasma spraying process; this embodiment The chemical formula of the high-entropy ceramic powder used is (La 1 / 5 SM 1 / 5 Gd 1 / 5 Nd 1 / 5 Er 1 / 5 ) 2 Zr 2 o 7 , the preparation method of high-entropy ceramic powder comprises the steps:

[0053] Step (A-1): La(NO 3 ) 3 ·6H 2 O, Sm(NO 3 ) 3 ·6H 2 O, Gd(NO 3 ) 3 ·6H 2 O, Nd(NO 3 ) 3 ·6H 2 O and Er(NO 3 ) 3 ·6H 2O five kinds of nitrates are fully mixed according to the molar ratio of 1:1:1:1:1, then add an appropriate amount of deionized water to dissolve to obtain a mixed nitrate solution, and then mix the mixed nitrate solu...

Embodiment 3

[0063] In this example, the low thermal conductivity and high entropy ceramic thermal barrier coating material is prepared by the following steps:

[0064] Step A: Preparation of high-entropy ceramic powder: using nitrate of trivalent rare earth elements and acetate of tetravalent metal elements as raw materials, a high-entropy ceramic powder with a hollow spherical structure is prepared by a plasma spraying process; this embodiment The chemical formula of medium and high entropy ceramic powder is (La 1 / 6 SM 1 / 6 Gd 1 / 6 Nd 1 / 6 Eu 1 / 6 Yb 1 / 6 ) 2 Zr 2 o 7 , the preparation method of high-entropy ceramic powder comprises the steps:

[0065] Step (A-1): La(NO 3 ) 3 ·6H 2 O, Sm(NO 3 ) 3 ·6H 2 O, Gd(NO 3 ) 3 ·6H 2 O, Nd(NO 3 ) 3 ·6H 2 O, Eu(NO 3 ) 3 ·6H 2 O and Yb(NO 3 ) 3 ·6H 2 O six kinds of nitrates are fully mixed according to the molar ratio of 1:1:1:1:1:1, then add an appropriate amount of deionized water to dissolve to obtain a mixed nitrate solution,...

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Abstract

A preparation method of the low-thermal-conductivity high-entropy ceramic thermal barrier coating material comprises the steps that A, nitrate of trivalent rare earth elements and acetate of tetravalent metal elements serve as raw materials, and high-entropy ceramic powder of a hollow spherical structure is prepared through a plasma spraying technology; step B, sequentially adding a polyvinyl alcohol aqueous solution and an ethanol solution into the high-entropy ceramic powder for grinding, and then putting the high-entropy ceramic powder into a drying oven for drying to obtain precursor powder; step C, pre-pressing the precursor powder into a disc-shaped or strip-shaped block material, putting the block material into a disposable rubber fingerstall, vacuumizing, and carrying out cold isostatic pressing treatment to obtain a ceramic green body; and D, firing the ceramic body, namely calcining the ceramic body in a muffle furnace, and cooling the ceramic body along with the furnace after calcining is finished. The high-entropy ceramic thermal barrier coating material disclosed by the invention is a pyrochlore phase, and compared with a YSZ material, the high-entropy ceramic thermal barrier coating material has lower thermal conductivity, good high-temperature phase stability and a thermal expansion coefficient closer to that of a base material.

Description

technical field [0001] The invention relates to the technical field of high-entropy ceramic materials. Specifically, it is a low thermal conductivity high entropy ceramic thermal barrier coating material. Background technique [0002] There are strict standards for the selection of thermal barrier coating materials. Since it works for a long time in complex environments such as high temperature and high pressure, it must meet the following points: the material has a high melting point; no phase change occurs in the working temperature range; Low thermal conductivity (<2.5W·m –1 ·K –1 ); Good chemical stability and corrosion resistance; Match the thermal expansion coefficient of the substrate (usually the thermal expansion coefficient of the coating is required to be >10×10 -6 K -1 ); It has high bonding strength with the metal matrix; it has good sintering resistance. Rare Earth Zirconate A 2 B 2 o 7 Ceramic materials have been used as one of the candidate mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/622
CPCC04B35/48C04B35/50C04B35/622C04B35/62222C04B2235/3224C04B2235/3227C04B2235/3251C04B2235/6562C04B2235/6567C04B2235/5445
Inventor 马文韩欣欣董红英白玉任志坚郝家京闫淑芳刘琪祝浩梁伟程
Owner INNER MONGOLIA UNIV OF TECH
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