High-entropy rare-earth phosphate powder and preparation method thereof

A rare earth phosphate and rare earth nitrate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of no research report on high-entropy rare earth phosphate ceramic powder, unsuitable for popularization and use, and complicated preparation methods. , to achieve the effect of low raw material cost, matching thermal expansion coefficient and high solid solubility

Pending Publication Date: 2019-10-29
淄博星澳新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The preparation of the above high-entropy materials may require spark plasma sintering or high-energy ball milling. The preparation method is complicated and the cost is high, so it is not suitable for popularization and use.
And there is no research report on high-entropy rare earth phosphate ceramic powder

Method used

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  • High-entropy rare-earth phosphate powder and preparation method thereof
  • High-entropy rare-earth phosphate powder and preparation method thereof
  • High-entropy rare-earth phosphate powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Rare earth nitrate La(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O, Nd(NO 3 ) 3 ·6H 2 O, Sm(NO 3 ) 3 ·6H 2 O, Eu(NO 3 ) 3 ·6H 2 O is weighed according to an equimolar ratio, the total amount of rare earth nitrates is 1mol, and the content of each rare earth nitrate is 0.2mol. Put the above raw materials in a beaker, add deionized water, and magnetically stir at a rate of 200r / min for 2h , forming a uniform and transparent solution to obtain a rare earth nitrate mixed solution;

[0042] (2) Adding a phosphoric acid solution with a mass concentration of 85% in the rare earth nitrate mixed solution, the amount of phosphoric acid is 1mol, and stirring continuously during the addition until a uniform precipitation is formed to obtain a precipitate;

[0043] (3) After the precipitate was filtered and washed 3 times, it was dried in a drying oven for 12 hours at a drying temperature of 40°C, then placed in a muffle furnace, and kept at a temperature of 1300°C for 2 ...

Embodiment 2

[0047] (1) Rare earth nitrate La(NO 3 ) 3 ·6H 2 O, Y (NO 3 ) 3 ·6H 2 O, Nd(NO 3 ) 3 ·6H 2 O, Sm(NO 3) 3 ·6H 2 O, Eu(NO 3 ) 3 ·6H 2 O is weighed according to an equimolar ratio, the total amount of rare earth nitrates is 1mol, and the content of each rare earth nitrate is 0.2mol. Put the above raw materials in a beaker, add deionized water, and magnetically stir at a rate of 300r / min for 1h , forming a uniform and transparent solution to obtain a rare earth nitrate mixed solution;

[0048] (2) Adding a phosphoric acid solution with a mass concentration of 85% in the rare earth nitrate mixed solution, the amount of phosphoric acid is 1mol, and stirring continuously during the addition until a uniform precipitation is formed to obtain a precipitate;

[0049] (3) After the precipitate was filtered and washed 3 times, it was dried in a drying oven for 24 hours at a temperature of 30° C., then placed in a muffle furnace, and kept at a temperature of 1200° C. for 4 hour...

Embodiment 3

[0053] (1) Rare earth nitrate La(NO 3 ) 3 ·6H 2 O. YNO 3 ) 3 ·6H 2 O, Nd(NO 3 ) 3 ·6H 2 O, Yb(NO 3 ) 3 ·6H 2 O, Eu(NO 3 ) 3 ·6H 2 O is weighed according to an equimolar ratio, the total amount of rare earth nitrates is 1 mol, and the content of each rare earth nitrate is 0.2 mol. Put the above raw materials in a beaker, add deionized water, and magnetically stir at a rate of 120r / min for 4h , forming a uniform and transparent solution to obtain a rare earth nitrate mixed solution;

[0054] (2) Adding a phosphoric acid solution with a mass concentration of 85% in the rare earth nitrate mixed solution, the amount of phosphoric acid is 1mol, and stirring continuously during the addition until a uniform precipitation is formed to obtain a precipitate;

[0055] (3) After filtering and washing the precipitate for 3 times, dry it in a drying oven for 8 hours at 60°C, then place it in a muffle furnace, and keep it at 1150°C for 3 hours to obtain high-entropy rare earth p...

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Abstract

The invention relates to the technical field of high-temperature ceramic material coatings, and particularly relates to high-entropy rare-earth phosphate powder and a preparation method thereof. The high-entropy rare-earth phosphate powder disclosed by the invention has a chemical formula as the follows (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)PO4, (La0.2Y0.2Nd0.2Sm0.2Eu0.2)PO4, (La0.2Y0.2Nd0.2Yb0.2Eu0.2)PO4 or(La0.2Ce0.2Y0.2Yb0.2Er0.2)PO4. The high-entropy rare-earth phosphate powder has the advantages of high solid solubility, no impurity phase, low material heat conductivity, good high-temperature stability and adjustable expansion coefficient, can be used as a thermal barrier / environment barrier coating material of an Al<2>O<3f> / Al<2>O<3> composite material, and can also be used as a high-temperature heat insulation material. The preparation method of the high-entropy rare-earth phosphate powder provided by the invention is simple in process and low in calcining temperature.

Description

technical field [0001] The invention relates to the technical field of coating of high-temperature ceramic materials, in particular to a high-entropy rare earth phosphoric acid powder and a preparation method thereof. Background technique [0002] Oxide fiber reinforced oxide ceramic matrix composites such as Al 2 o 3f / Al 2 o 3 It is a candidate material for future aircraft engines and high-temperature gas turbines, and is expected to replace existing silicon-based ceramic composites such as SiC from 2025 onwards f / SiC is used as the hot end part of the combustion chamber (Document 1: J.Europ.Ceram.Soc., 34(2014) 3069-3080). However, in the high temperature engine combustion chamber environment, Al 2 o 3f / Al 2 o 3 Composite materials will undergo a series of changes such as grain growth, creep, and water vapor corrosion, so the Al 2 o 3f / Al 2 o 3 A layer of thermal / environmental barrier coating is applied on the surface of the composite material to prevent th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
CPCC01B25/45C01P2002/72C01P2004/03C01P2006/32
Inventor 吴事江蒋丹宇刘家臣巩玉贤杨焕顺林杨张合军
Owner 淄博星澳新材料研究院有限公司
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