Preparation method of impermeable ceramic material capable of rapidly reacting with low-melting-point oxide

A fast-reacting, ceramic material technology, applied in the field of ceramic material preparation, can solve the problems of low melting point oxide corrosion, failure, etc., and achieve the effect of improving permeability and permeability resistance.

Pending Publication Date: 2022-06-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a ceramic material that reacts quickly with low-melting point oxides and is impervious to penetration, aiming to solve the problem of the high-temperature service of porous thermal barrier coatings, environmental barrier coatings and thermal barrier coating materials The technical problem that it is easy to be corroded by low melting point oxides in the environment and cause failure

Method used

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  • Preparation method of impermeable ceramic material capable of rapidly reacting with low-melting-point oxide
  • Preparation method of impermeable ceramic material capable of rapidly reacting with low-melting-point oxide
  • Preparation method of impermeable ceramic material capable of rapidly reacting with low-melting-point oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for preparing a ceramic material that reacts rapidly with a low melting point oxide and is resistant to penetration, comprising the following steps:

[0028] (1) Weigh La with a purity greater than 99% 2 O 3 , Y 2 O 3 , Nb 2 O 5 Powder, La 2 O 3 , Y 2 O 3 and Nb 2 O 5 The molar ratio of the powder is 0.5:1:0.5; the three powders are mixed evenly by a ball mill, the speed of the ball mill is 200 rpm, the ball milling time is 48h, and alcohol is used as the ball milling medium in the ball milling process. The total mass of the three powders and alcohol The mass ratio is 1:10 to obtain uniformly mixed slurry;

[0029] (2) The uniformly mixed slurry is dried at 90°C for 20h, pre-sintered at 1000°C for 10h and cooled to obtain initial powder;

[0030] (3) The initial powder was ground and passed through a 300-mesh sieve, according to LaY 2 NbO 7 The required porosity (5-15%), press the tablet under the conditions of a pressing pressure of 100MPa and a ...

Embodiment 2

[0034] A method for preparing a ceramic material that reacts rapidly with a low melting point oxide and is resistant to penetration, comprising the following steps:

[0035] (1) Weigh La with a purity greater than 99% 2 O 3 , Tm 2 O 3 , Nb 2 O 5 Powder, La 2 O 3 , Tm 2 O 3 and Nb 2 O 5 The molar ratio of the powder is 0.4:1:0.4; the three powders are mixed evenly by a ball mill, the speed of the ball mill is 500 rpm, the ball milling time is 24h, and alcohol is used as the ball milling medium in the ball milling process. The total mass of the three powders and alcohol The mass ratio is 1:30 to obtain a uniformly mixed slurry;

[0036] (2) drying the uniformly mixed slurry at 100°C for 10h, pre-sintering at 900°C for 9h and cooling to obtain initial powder;

[0037] (3) Grind the initial powder and pass through a 350-mesh sieve, according to LaTm 2 NbO 7 The porosity requirement (5-15%), press the tablet under the conditions of a pressing pressure of 200MPa and a ...

Embodiment 3

[0040] A method for preparing a ceramic material that reacts rapidly with a low melting point oxide and is resistant to penetration, comprising the following steps:

[0041] (1) Weigh La with a purity greater than 99% 2 O 3 , Pr 2 O 3 , Nb 2 O 5 Powder, La 2 O 3 , Pr 2 O 3 and Nb 2 O 5 The molar ratio of the powder is 0.6:1:0.6; the three powders are mixed evenly by a ball mill, the speed of the ball mill is 360 rpm, the ball milling time is 30h, and alcohol is used as the ball milling medium in the ball milling process. The total mass of the three powders and alcohol The mass ratio is 1:26 to obtain uniformly mixed slurry;

[0042] (2) The uniformly mixed slurry was dried at 93°C for 16h, pre-sintered at 960°C for 9.3h and cooled to obtain initial powder;

[0043] (3) Grind the initial powder and pass through a 330-mesh sieve, according to LaPr 2 NbO 7 The required porosity (5-15%), press the tablet under the conditions of a pressing pressure of 160MPa and a hol...

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Abstract

The invention relates to a preparation method of an anti-permeation ceramic material capable of rapidly reacting with low-melting-point oxides, which comprises the following steps: weighing La2O3, RE2O3 and Nb2O5 powder with the purity of more than 99%, uniformly mixing the powder through a ball mill, and using alcohol as a ball milling medium to obtain slurry; drying the slurry, presintering at high temperature, and cooling to obtain initial powder; and grinding and sieving the initial powder, tabletting and sintering to obtain the impermeable LaRE2NbO7 ceramic material which has the porosity of 5-15% and can quickly react with the low-melting-point oxide. The niobate ceramic with certain porosity is prepared by utilizing a high-temperature solid-phase method, the contact area of the niobate ceramic and the low-melting-point oxide is enlarged, so that the reaction is accelerated, and a product with large volume, small density and excellent chemical stability is formed through the rapid reaction of the material and the low-melting-point oxide; pores are quickly blocked, so that low-melting-point oxide melt is effectively prevented from permeating into the material, and the ceramic material which can be used for a long time at high temperature is obtained.

Description

technical field [0001] The invention relates to the technical field of high-temperature protective structural ceramics, in particular to a method for preparing a ceramic material that reacts rapidly with a low-melting-point oxide and is resistant to penetration. Background technique [0002] In the fields of thermal barrier coatings, environmental barrier coatings and thermal protective coatings, the resistance to penetration of low melting point oxides is a key parameter that determines its service life and service performance. Due to volcanic eruptions, sandstorms and evaporation of ocean salt water, the air contains a large amount of low melting point oxides (CaO-MgO-Al 2 O 3 -SiO 2 -Fe 2 O 3 ), during the application of the above coating materials, the ceramic coating will be in contact with the low melting point oxide, and the high temperature causes it to melt and flow into the interior from the coating holes, and then in the process of heating and cooling, the low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/505C04B35/622
CPCC04B35/505C04B35/50C04B35/622C04B2235/3227C04B2235/3251C04B2235/6567
Inventor 陈琳冯晶
Owner KUNMING UNIV OF SCI & TECH
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