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Lanthanide rare-earth tantalite high-temperature ceramic and preparation method thereof

A technology of lanthanide rare earth and high temperature ceramics is applied in the field of high temperature materials to achieve the effects of low preparation cost, good mechanical and thermal properties, and low impurity content

Active Publication Date: 2016-07-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wang Fuzhi and others used rare earth oxides and tantalum oxides as raw materials, and added a co-solvent to sinter them into rare-earth tantalates, but there will be a certain amount of impurities in the first sintering, adding a co-solvent LiCO 3 Some impurities will also be introduced
Chinese patent ZL00126047.2 adds a mixed flux of lithium sulfate-sodium sulfate to the oxides of tantalum oxide, yttrium oxide and strontium carbonate to sinter into tantalate, but this method will introduce some impurity phases

Method used

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  • Lanthanide rare-earth tantalite high-temperature ceramic and preparation method thereof
  • Lanthanide rare-earth tantalite high-temperature ceramic and preparation method thereof
  • Lanthanide rare-earth tantalite high-temperature ceramic and preparation method thereof

Examples

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Effect test

Embodiment example 1

[0024] A new type of high temperature resistance, anti-oxidation, anti-wear dysprosium tantalate (DyT) described in this embodiment a o 4 ) ceramic material and preparation method thereof, specifically comprising the following steps:

[0025] Weigh dysprosium oxide (Dy 2 o 3 )8.0611g, tantalum oxide (Ta 2 o 5 ) 15.7749g, mixed in absolute ethanol, placed in a planetary ball mill (rotating speed of the ball mill is 300r / min, ball milling time is 180min), the ball milled solution was dried at 60°C for 24 hours and passed through 100 mesh Sieve, and then use a mold to press and form (the holding pressure is 8MPa, and the holding time is 60min). After pressing and forming, it is pre-fired at 800°C for 10 hours.

[0026] After calcining the raw material for the first time, the mixture is ground evenly, dissolved in absolute ethanol again, and placed in a planetary ball mill for ball milling (the rotating speed of the ball mill is 300r / min, and the ball milling time is 180min),...

Embodiment example 2

[0029] A new type of high temperature resistance, anti-oxidation, anti-wear dysprosium tantalate (EuTaO) described in this embodiment 4 ) ceramic material and preparation method thereof, specifically comprising the following steps:

[0030] Weigh europium oxide (Eu 2 o 3 ) 12.5632g, tantalum oxide (Ta 2 o 5 ) 15.7749g, mixed in absolute ethanol, placed in a planetary ball mill for ball milling (the speed of the ball mill is 350r / min, and the ball milling time is 160min), the ball milled solution was dried at 64°C for 22 hours and passed through 200 mesh Sieve, and then use a mold to press and form (the holding pressure is 9MPa, and the holding time is 50min). After pressing and forming, it is pre-fired at 850°C for 9 hours.

[0031] After calcining the raw material for the first time, the mixture is ground evenly, dissolved in absolute ethanol again, placed in a planetary ball mill for ball milling (the rotating speed of the ball mill is 350r / min, and the ball milling time...

Embodiment example 3

[0033] A new type of high temperature resistance, anti-oxidation, anti-wear dysprosium tantalate (LuTaO4) ceramic material and its preparation method described in this embodiment specifically include the following steps:

[0034] Weigh lutetium oxide (Lu 2 o 3) 14.2070g, tantalum oxide (Ta 2 o 5 ) 15.7749g, after mixing in absolute ethanol, 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 140min), and the ball milled solution is dried at 68°C for 18 hours and passed through 300 mesh Sieve, and then use a mold to press and form (the holding pressure is 10MPa, and the holding time is 45min). After pressing and forming, it is pre-fired at 900°C for 8 hours.

[0035] After calcining the raw material for the first time, the mixture is ground evenly, dissolved in absolute ethanol again, placed in a planetary ball mill for ball milling (the rotating speed of the ball mill is 400r / min, and the ball milling time...

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Abstract

The invention discloses a method for preparing lanthanide rare-earth tantalite ceramic through a solid phase method.The molecular formula of the compound is RETaO4 (RE=Dy, Eu, Lu, Yb, Nd, Gd and Er).The adopted raw materials are Ta2O5, Dy2O3, Eu2O3, Lu2O3, Yb2O3, Nd2O3, Gd2O3 and Er2O3.The raw materials are weighed proportionally, the weighed raw materials are mixed in absolute ethyl alcohol and then placed into a planetary ball mill for ball milling so as to be mixed to be uniform, the mixed powder is dried, screened and placed into a mold to be compacted, and then presintering is performed; cooling is performed, a presintered sample is taken out to be subjected to grinding, ball milling, drying and screening, the screened powder is placed into the mold to be compacted, and then secondary sintering is performed.The technology is high in purity, low in impurity content, low in product preparation cost and suitable for batch production, and the target product is expected to be adopted as a novel high-temperature resistant, antioxidant and anti-wearing ceramic material.

Description

technical field [0001] The invention relates to a novel high-temperature-resistant, oxidation-resistant and wear-resistant lanthanide rare earth tantalate ceramic material and a preparation method thereof, belonging to the field of high-temperature materials. Background technique [0002] High-temperature ceramic materials are widely and importantly applied in the fields of aviation, transportation, and large-scale thermal power plants. A lot of research work has been carried out at home and abroad in order to obtain high-temperature ceramic materials with excellent performance. Studies have shown that ZrO 2 It is a high-temperature ceramic material that is widely used and has the best comprehensive performance. It has the characteristics of high melting point, high temperature oxidation resistance, good high temperature chemical stability, low and stable thermal conductivity and excellent thermal shock resistance, and the thermal expansion coefficient is close to that of m...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/50C04B35/626
CPCC04B35/495C04B35/50C04B35/6261C04B2235/3224
Inventor 冯晶蒋业华周荣汪俊
Owner KUNMING UNIV OF SCI & TECH
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