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Preparation method of rare-earth tantalate high-temperature ceramic

A technology of high-temperature ceramics and tantalate, applied in the field of high-temperature materials, can solve the problems of low density, complex process and many pores, and achieve the effects of high density, high process purity and high sintering activity

Inactive Publication Date: 2017-10-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, when preparing dense bulk ceramics, liquid phase and solid phase sintering aids are generally added, mainly CuO, TiO 2 or PVA, etc., these will affect the thermophysical properties of the material to a certain extent, or the dense sample is obtained by the method of double sintering, the process is complex, time-consuming, and the obtained sample often has many defects or Impurities, there are many pores, the density is not high and other shortcomings

Method used

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  • Preparation method of rare-earth tantalate high-temperature ceramic
  • Preparation method of rare-earth tantalate high-temperature ceramic
  • Preparation method of rare-earth tantalate high-temperature ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of rare earth tantalate CeTa 3 o 9 The preparation method of high-temperature ceramics specifically comprises the following steps:

[0031] (1) Weigh 0.01 mol rare earth oxide Ce 2 o 3 Calcined at 600°C for 10h and cooled in the furnace, then added to concentrated nitric acid, and reacted in a water bath at 75°C to obtain Ce(NO 3 ) 3 , reacted until the granular Ce could not be observed by the naked eye 2 o 3 The existence of is the completion of the reaction;

[0032] (2) According to the molar ratio of rare earth elements to Ta in step (1) of 1:3, TaOCl 3 Add it to the reactant in step (1), mix and stir for half an hour, place it in an ultrasonic generator for ultrasonication, and at the same time add concentrated ammonia water drop by drop and vigorously stir it mechanically. Be 10, obtain colloidal solution;

[0033] (3) Filter the sol obtained in step (2), wash it three times with deionized water and wash it twice with alcohol, then keep it in an ov...

Embodiment 2

[0035] A rare earth tantalate NdTa 3 o 9 The preparation method of high-temperature ceramics specifically comprises the following steps:

[0036] (1) Weigh 0.01 mol rare earth oxide Nd 2 o 3 Calcined at 1000°C for 6 hours and cooled in the furnace, then added to concentrated nitric acid, and reacted in a water bath at 70°C to obtain Nd(NO 3 ) 3 , until the granular Nd cannot be observed by the naked eye 2 o 3 The existence of is the completion of the reaction;

[0037](2) According to the molar ratio of rare earth elements to Ta in step (1) of 1:3, TaOCl 3 Add to the reactant in step (1), mix and stir for half an hour, then place it in an ultrasonic generator for ultrasonication, and at the same time add concentrated ammonia water drop by drop and vigorously stir mechanically. The dropping speed of concentrated ammonia water is 1mL / min, and the pH value of the reaction system is controlled. Be 9, obtain colloidal solution;

[0038] (3) Filter the sol obtained in step ...

Embodiment 3

[0040] A rare earth tantalate SmTa 3 o 9 The preparation method of high-temperature ceramics specifically comprises the following steps:

[0041] (1) Weigh 0.01 mol rare earth oxide Sm 2 o 3 Calcined at 900°C for 7h and cooled in the furnace, then added to concentrated nitric acid, and reacted in a water bath at 80°C to obtain Sm(NO 3 ) 3 , until the granular Sm cannot be observed by the naked eye 2 o 3 The existence of is the completion of the reaction;

[0042] (2) According to the molar ratio of rare earth elements to Ta in step (1) of 1:3, TaOCl 3 Add to the reactants in step (1), mix and stir for half an hour, then place in an ultrasonic generator for ultrasonication, and at the same time add concentrated ammonia water drop by drop and vigorously stir mechanically, the dropping rate of concentrated ammonia water is 1.5mL / min, control the pH of the reaction system The value is 11, and a colloidal solution is obtained;

[0043] (3) Filter the sol obtained in step (...

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Abstract

The invention discloses a preparation method of rare-earth tantalate high-temperature ceramic. Adding RE2O3 into concentrated nitric acid, reacting to obtain a mixture, then adding TaOCl3 for mixing and stirring for 0.5 hour, adding mass of strong ammonia water to control the pH value of the reaction system to be 9 to 11, stirring to obtain a precipitated colloid, and performing filtration ,washing, drying, roasting, tabletting and sintering on the precipitated colloid to obtain the rare-earth tantalate high-temperature ceramic. According to the preparation method provided by the invention, the process purity is high, the impurity content is low, the sample is compact, the product preparation cost is low, the preparation method is suitable for production in batch, and the target product is likely to be used as a novel ceramic material with high temperature-resistance, oxidation resistance and wear-resistance.

Description

technical field [0001] The invention belongs to the technical field of high-temperature materials, and in particular relates to a preparation method of a novel wear-resistant lanthanide rare earth tantalate ceramic material with high temperature resistance, oxidation resistance, low thermal conductivity and compact structure. Background technique [0002] Thermal barrier coatings are mainly used in the aero-engine industry. They have good heat insulation effect, high temperature oxidation resistance, wear resistance and corrosion resistance. They are currently one of the most advanced high temperature protective coatings and the surface protection with the best application prospects. One of the coatings. The most widely used thermal barrier coating material is yttria-stabilized zirconia (YSZ), which has a high melting point (2700°C) and low thermal conductivity (2.5W.m -1 k -1 ), high coefficient of thermal expansion (11.0×10 -6 ℃), excellent mechanical properties and so ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B35/626
CPCC04B35/495C04B35/622C04B35/62605C04B2235/9607C04B2235/656C04B2235/3229C04B2235/3224
Inventor 冯晶陈琳葛振华
Owner KUNMING UNIV OF SCI & TECH
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