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Gamma-type high-entropy rare earth disilicate with ultrahigh-temperature stability and preparation method thereof

A silicate and stable technology, which is applied in the field of ceramic materials for thermal barrier/environmental barrier integrated coatings of advanced aero-engines, and can solve the problems of weak corrosion resistance of high temperature molten oxides, limited proportion of other elements, and high price. , to achieve the effect of single-phase purity, low density and simple process

Active Publication Date: 2020-04-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the two rare earth elements Yb and Lu are the most dense and expensive among the known rare earth elements, which conflicts with the design requirements for weight reduction and cost reduction of new engines in the future (L.R.Turcer, et al. Towards multifunctional thermal environmental barrier coatings (TEBCs) based on rare-earth pyrosilicate solid-solution ceramics, Scripta Materialia 154 (2018) 111–117); moreover, recent studies have shown that single-phase β-structured Yb 2 Si 2 o 7 and Lu 2 Si 2 o 7 The corrosion resistance of high temperature molten oxide CMAS is weak, so it is not enough to be used as an environmental barrier coating
[0004] Some researchers can achieve performance improvement in rare earth-containing materials by rationally selecting and designing the types and solid solution amounts of rare earth elements in rare earth bisilicates (A.J.Fernandez-Carrion, et at, Solid solubility of Yb 2 Si 2 o 7 inβ-,γ-andδ-Y 2 Si 2 o 7 , J.Solid State Chem.184(2011)1882.), but this binary solid solution method, the proportion of other elements that can be dissolved in solid solution is limited, breaking through the "upper limit" will cause the material to change from β-type to γ-type or the transformation of the δ-type crystal form

Method used

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  • Gamma-type high-entropy rare earth disilicate with ultrahigh-temperature stability and preparation method thereof
  • Gamma-type high-entropy rare earth disilicate with ultrahigh-temperature stability and preparation method thereof
  • Gamma-type high-entropy rare earth disilicate with ultrahigh-temperature stability and preparation method thereof

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Embodiment 1

[0031] In this embodiment, the primary particle size of the raw material gadolinium oxide, dysprosium oxide, holmium oxide, ytterbium oxide, lutetium oxide and silicon oxide powder is 100 mesh, and the purity is ≥99.9 wt%. Put 7.25g of gadolinium oxide, 7.46g of dysprosium oxide, 7.56g of holmium oxide, 7.88g of ytterbium oxide, 7.96g of lutetium oxide and 12.02g of silicon oxide, using absolute ethanol as the medium, put the powder into a silicon nitride ball mill jar and mill for 24 Hours, the dried powder was subjected to pressureless sintering synthesis in a muffle furnace. The pressureless sintering synthesis process is as follows: heating up to 1550°C at a rate of 5°C / min, holding the temperature for 6 hours, cooling with the furnace after the reaction, and finally preparing the target γ-type high-entropy rare earth bisilicate ceramic powder material. The volume average particle size is about 0.5-3 μm.

[0032] Such as figure 1 As shown, the reaction product obtained i...

Embodiment 2

[0034] In this embodiment, the primary particle size of the raw materials gadolinium oxide, dysprosium oxide, terbium oxide, thulium oxide, ytterbium oxide, lutetium oxide and silicon oxide powder is 200 mesh, and the purity is ≥99.9 wt%. Put 12.08 grams of gadolinium oxide, 12.43 grams of dysprosium oxide, 12.46 grams of terbium oxide, 12.86 grams of thulium oxide, 13.14 grams of ytterbium oxide, 13.26 grams of lutetium oxide and 24.05 grams of silicon oxide. The ball milled in a silicon ball mill jar for 8 hours, and the dried powder was sintered and synthesized in a muffle furnace without pressure. The pressureless sintering synthesis process is as follows: heating up to 1500°C at a rate of 15°C / min, holding the temperature for 20 hours, cooling with the furnace after the reaction, and finally preparing the target γ-type high-entropy rare earth bisilicate ceramic powder material. The volume average particle size is about 0.5-5 μm.

[0035] Put the powders synthesized by pr...

Embodiment 3

[0038] In this embodiment, the primary particle size of the raw materials gadolinium oxide, dysprosium oxide, terbium oxide, thulium oxide, ytterbium oxide, lutetium oxide and silicon oxide powder is 200 mesh, and the purity is ≥99.9 wt%. Put 12.08 grams of gadolinium oxide, 12.43 grams of dysprosium oxide, 12.46 grams of terbium oxide, 12.86 grams of thulium oxide, 13.14 grams of ytterbium oxide, 13.26 grams of lutetium oxide and 24.05 grams of silicon oxide. The ball milled in a silicon ball mill jar for 2 hours, and the dried powder was sintered and synthesized in a muffle furnace without pressure. The pressureless sintering synthesis process is as follows: heating up to 1650°C at a rate of 10°C / min, holding the temperature for 0.5 hours, cooling with the furnace after the reaction, and finally preparing the target γ-type high-entropy rare earth bisilicate ceramic powder material. The volume average particle size is about 2-5 μm.

[0039] Put the powder after pressureless ...

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Abstract

The invention relates to the field of ceramic materials for thermal barrier / environmental barrier integrated coating layers of advanced aero-engines, and in particular, relates to gamma-type high-entropy rare earth disilicate with ultrahigh-temperature stability and a preparation method thereof. The chemical formula of the gamma-type high-entropy rare earth disilicate ceramic material is defined in the specification, wherein n is more than or equal to 5, and REn is one of rare earth elements Y, Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu respectively. The preparation method specifically comprises the preparation processes: by taking corresponding rare earth oxide powder and silicon oxide powder as raw materials, performing wet mixing, and performing pressureless sintering synthesis in an air atmosphere, and thus obtaining the gamma-type high-entropy rare earth disilicate ceramic powder material; and further hot-pressing and sintering in a hot-pressing furnace witha protective atmosphere to obtain the gamma-type high-entropy rare earth disilicate ceramic block material with excellent high-temperature phase stability. According to the invention, the gamma-typehigh-entropy ceramic material with high purity, high density and excellent high-temperature phase stability can be prepared.

Description

technical field [0001] The invention relates to the field of ceramic materials for advanced aero-engine thermal barrier / environmental barrier integrated coatings, specifically a gamma-type high-entropy rare earth bisilicate ceramic powder material, block material and its preparation method. Background technique [0002] The advanced aviation power system is known as the "Pearl in the Crown" of modern industry, and it is an important symbol of a country's technological, industrial, economic and national defense strength. Thrust-to-weight ratio is an important index to measure the working ability of aero-engine, and increasing the temperature before the turbine is the main way to achieve high thrust-to-weight ratio and working efficiency of aero-engine. Continuous fiber reinforced silicon carbide ceramic matrix composites (CMC) have low density, excellent high temperature mechanical properties and oxidation resistance, and will definitely be used in turbine outer rings, turbi...

Claims

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Application Information

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IPC IPC(8): C04B35/16C04B35/626C04B35/645
CPCC04B35/16C04B35/62675C04B35/6268C04B35/645C04B2235/6562C04B2235/6567C04B2235/658C04B2235/3418C04B2235/3224C04B2235/5427C04B2235/5436
Inventor 王京阳孙鲁超罗颐秀吴贞杜铁峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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