In-situ-synthesized fake binary complex-phase rare earth niobate ceramic and preparation method thereof

An in-situ synthesis and pseudo-binary technology, applied in the field of high-temperature materials, can solve the problems of low fracture toughness and cannot be directly applied, and achieve the effects of improved fracture toughness, low preparation cost, and good high-temperature thermal stability.

Active Publication Date: 2019-08-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, Feng et al. synthesized RE by a solid-phase method 3 NbO 7 (RE=La, Nd, Sm, Eu, Gd, Dy) and found that it has good thermal properties and is a potential thermal barrier coating material, but its fracture toughness is low and cannot be directly applied

Method used

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  • In-situ-synthesized fake binary complex-phase rare earth niobate ceramic and preparation method thereof
  • In-situ-synthesized fake binary complex-phase rare earth niobate ceramic and preparation method thereof
  • In-situ-synthesized fake binary complex-phase rare earth niobate ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of pseudo-binary complex-phase yttrium niobate (Y 3 NbO 7 -YNbO 4 ) high-temperature ceramic material and preparation method thereof, specifically comprising the following steps:

[0032] (1) Weigh 6.1036g of yttrium oxide and 3.4475g of niobium oxide, mix them in absolute ethanol, and place them in a planetary ball mill for ball milling (the speed of the ball mill is 250r / min, and the ball milling time is 240min), and the milled solution Pre-fired at 1250° C. for 10 hours after rotary evaporation drying.

[0033] (2) After pre-sintering, grind the mixed powder evenly, mix and grind the powder with absolute ethanol as a solvent, and place it in a planetary ball mill for ball milling (the speed of the ball mill is 250r / min, and the ball milling time is 600min); ball mill the powder After rotary evaporation and drying, pass through a 200-mesh sieve to obtain a fine powder; then use hydraulic pressure to form (holding pressure is 5 MPa, holding time is 5min), and...

Embodiment 2

[0035] A new pseudo-binary complex phase lanthanum niobate (La 3 NbO 7 -LaNbO 4 ) high-temperature ceramic material and preparation method thereof, specifically comprising the following steps:

[0036] (1) Weigh 8.8002g of lanthanum oxide and 3.4526g of niobium oxide, mix them in absolute ethanol, place them in a planetary ball mill for ball milling (the speed of the ball mill is 250r / min, and the ball milling time is 240min), and the milled solution Pre-fired at 1250° C. for 10 hours after rotary evaporation drying.

[0037](2) After pre-sintering, grind the mixed powder evenly, mix and grind the powder with absolute ethanol as a solvent, and place it in a planetary ball mill for ball milling (the speed of the ball mill is 250r / min, and the ball milling time is 600min); ball mill the powder After rotary evaporation and drying, pass through a 200-mesh sieve to obtain a fine powder; then use hydraulic pressure to form (holding pressure is 5 MPa, holding time is 5min), and th...

Embodiment 3

[0039] A new type of pseudo-binary complex phase cerium niobate (Ce 3 NbO 7 -CeNbO 4 ) high-temperature ceramic material and preparation method thereof, specifically comprising the following steps:

[0040] (1) Weigh 8.8502g of cerium oxide and 3.4478g of niobium oxide, mix them in absolute ethanol, place them in a planetary ball mill for ball milling (the speed of the ball mill is 250r / min, and the ball milling time is 240min), and the milled solution Pre-fired at 1250° C. for 10 hours after rotary evaporation drying.

[0041] (2) After pre-sintering, grind the mixed powder evenly, mix and grind the powder with absolute ethanol as a solvent, and place it in a planetary ball mill for ball milling (the speed of the ball mill is 250r / min, and the ball milling time is 600min); ball mill the powder After rotary evaporation and drying, pass through a 200-mesh sieve to obtain a fine powder; then use hydraulic pressure to form (holding pressure is 5 MPa, holding time is 5min), and...

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Abstract

The invention discloses in-situ-synthesized fake binary complex-phase rare earth niobate ceramic and a preparation method thereof. The preparation method comprises the following steps: 1), calcinatingrare earth oxide RE2O3, then mixing with niobium oxide (Nb2O5) by a wet ball milling method, performing rotary evaporative drying, sintering and sieving to obtain presintered powder, grinding the pre-sintered powder by the wet ball milling method, performing rotary evaporation and sieving to obtain fine powder; 2), placing the fine powder in a mould, hydraulically compacting, performing cold isostatic compacting and then secondarily sintering to obtain the fake binary complex-phase rare earth niobate ceramic. By the preparation method, a technology is simple, a product is low in preparation cost and high in purity and is suitable for batch production, and the prepared fake binary complex-phase rare earth niobate ceramic has relatively good thermal properties.

Description

technical field [0001] The invention belongs to the technical field of high-temperature materials, and in particular relates to a novel pseudo-binary complex-phase rare-earth niobate ceramic with high temperature resistance, low thermal conductivity and high toughness and a preparation method thereof. Background technique [0002] Thermal barrier coatings are mainly used as thermal insulation coatings for large heat engines, such as aero-engines, gas turbines, etc., and are widely used because of their good thermal insulation and high temperature protection effects. Raising the inlet temperature of the engine can improve the thermal efficiency of the engine, reduce emissions, and reduce pollution. The main thermal barrier coating material currently used is yttria-stabilized zirconia (7-8YSZ) with a metastable tetragonal phase. However, when the operating temperature exceeds 1200 ° C, the phase stability of YSZ becomes poor and easy to sinter, and the thermal conductivity Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/50C04B35/505C04B35/622
CPCC04B35/495C04B35/50C04B35/505C04B35/62222C04B2235/3224C04B2235/3227C04B2235/3229
Inventor 万春磊张鹏潘伟
Owner TSINGHUA UNIV
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