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Preparation method of double-rare-earth-ion tantalite high-temperature ceramic

A high-temperature ceramic and tantalate technology, which is applied in the field of preparation of double rare earth ion tantalate high-temperature ceramics, can solve problems such as cracks in high-temperature ceramic materials, loss of thermal barrier coating ceramic materials, and mismatching thermal expansion coefficients. The effect of good high temperature thermal stability

Inactive Publication Date: 2017-01-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal barrier coating ceramic material (YSZ) can only work stably in an environment below 1200 °C. When the operating temperature exceeds 1200 °C, the YSZ ceramic material is prone to phase transition, and the thermal expansion coefficient becomes mismatched with the base material, resulting in The formation of cracks in high-temperature ceramic materials will eventually lead to the loss and failure of thermal barrier coating ceramic materials, and it is difficult to meet the requirements of increasing gas inlet temperature in front of thermal engines.

Method used

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  • Preparation method of double-rare-earth-ion tantalite high-temperature ceramic

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Embodiment 1

[0024] A high-temperature-resistant, anti-oxidation, anti-wear double rare earth ion tantalate high-temperature ceramic material (Eu 0.6 Gd 0.4 TaO 4 ) and a preparation method thereof, specifically comprising the following steps:

[0025] Weigh 5.2788g of europium oxide, 3.6249g of gadolinium oxide, and 11.0473g of tantalum oxide, mix them in absolute ethanol, place them in a planetary ball mill for ball milling (the speed of the ball mill is 400r / min, and the ball milling time is 120min), and the balls are ground The mixture was dried at 74°C for 16 hours and passed through a 300-mesh sieve, and then pre-fired at 1650°C for 5 hours.

[0026] After calcining the raw materials for the first time, grind the mixture to fine particles (10-30 μm), dissolve it in absolute ethanol again, and place it in a planetary ball mill for ball milling (the speed of the ball mill is 400r / min, and the ball milling time is 120min) , the ball-milled mixture was dried at 74°C for 16 hours and p...

Embodiment 2

[0029] A kind of novel high temperature resistance described in this embodiment, anti-oxidation, anti-abrasion double rare earth ion tantalate high temperature ceramic material (La 0.75 SM 0.25 TaO 4 ) and a preparation method thereof, specifically comprising the following steps:

[0030] Weigh 4.8871g of lanthanum oxide, 1.7435g of samarium oxide, and 8.8378g of tantalum oxide, mix them in absolute ethanol, place them in a planetary ball mill for ball milling (the speed of the ball mill is 350r / min, and the ball milling time is 140min), and the balls are ground The mixture was dried at 65°C for 20 hours and passed through a 300-mesh sieve, and then pre-fired at 1550°C for 8 hours.

[0031] After calcining the raw materials for the first time, grind the mixture to fine particles (10-30 μm), dissolve it in absolute ethanol again, and place it in a planetary ball mill for ball milling (the speed of the ball mill is 350r / min, and the ball milling time is 140min) , the ball-mil...

Embodiment 3

[0033] A new type of high temperature resistance described in this embodiment, anti-oxidation, anti-wear double rare earth ion tantalate high temperature ceramic material (Y0.5 Dy 0.5 TaO 4 ) and a preparation method thereof, specifically comprising the following steps:

[0034] Weigh 5.6452g of yttrium oxide, 9.3249g of dysprosium oxide, and 22.0946g of tantalum oxide, mix them in absolute ethanol, place them in a planetary ball mill for ball milling (the speed of the ball mill is 300r / min, and the ball milling time is 180min), and the balls are ground The mixture was dried at 60°C for 24 hours and passed through a 300-mesh sieve, and then pre-fired at 1650°C for 10 hours.

[0035] After calcining the raw materials for the first time, grind the mixture to fine particles (10-30 μm), dissolve it in absolute ethanol again, and place it in a planetary ball mill for ball milling (the speed of the ball mill is 300r / min, and the ball milling time is 180min) , the ball-milled mixtu...

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Abstract

The invention relates to a preparation method of double-rare-earth-ion tantalite high-temperature ceramic and belongs to the technical field of high-temperature ceramic preparation. The molecular formula of the double-rare-earth-ion tantalite high-temperature ceramic is shown in the description (REa / REb = Y, La, Nd, Sm, Eu, Gd, Dy, Er and Yb, and REa and REb are not the same type of rare earth elements). The used raw materials are rare earth oxide and tantalum oxide andare weighed in proportion, the weighed raw materials and absolute ethyl alcohol are put in a ball milling tank for mixing and sealing, then the mixture is put on a planetary ball mill for ball milling, the mixture can be evenly mixed, and primary sintering is performed after the mixed powder is dried and screened; the cooled and taken-out sample is grinded, ball-milled, dried and screened and then is put in a mold for compaction, and then secondary sintering is performed. The preparation method is high in purity, low in impurity content, low in product device cost and suitable for batch production, and the product is expected to be a novel ceramic material resistant tohigh temperature, oxidation and abrasion.

Description

technical field [0001] The invention relates to a preparation method of double rare earth ion tantalate high-temperature ceramics, belonging to the technical field of high-temperature ceramic preparation. Background technique [0002] From the high-temperature ceramic materials studied in the past, the ceramic materials that may be suitable for high-temperature thermal barrier coatings mainly include yttria / ceria stabilized zirconia, zirconia / alumina, lanthanum zirconate, strontium zirconate, zirconium phosphate, Zirconium silicate, zirconium titanate, mullite, rare earth oxide ceramics, etc. Among them, yttria-stabilized zirconia (YSZ) has the best overall performance and is currently a widely used ceramic thermal barrier coating. However, the thermal barrier coating ceramic material (YSZ) can only work stably in an environment below 1200 °C. When the operating temperature exceeds 1200 °C, the YSZ ceramic material is prone to phase transition, and the thermal expansion coef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/96C04B2235/9607C04B2235/3224C04B2235/5436
Inventor 冯晶汪俊周荣蒋业华
Owner KUNMING UNIV OF SCI & TECH
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