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Preparation method of nanometer zirconia heat barrier coating

A nano-zirconia and thermal barrier coating technology, applied in coating, metal material coating process, air transportation, etc., can solve the problems of complex thermal barrier coating equipment and high preparation cost, and achieve low cost and good fluidity. , The effect of good sol dispersion

Inactive Publication Date: 2011-08-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the preparation of thermal barrier coatings by vapor deposition method is complex and costly

Method used

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  • Preparation method of nanometer zirconia heat barrier coating
  • Preparation method of nanometer zirconia heat barrier coating
  • Preparation method of nanometer zirconia heat barrier coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: take by weighing 730 grams of crystal ZrOCl 2 ·8H 2 O (molar mass 322.22g / mol, i.e. about 2.27mol in 730g) is dissolved in the mixed solvent (1:1) of absolute ethanol and deionized water; in order to make the zirconium ion concentration in the solution be 1.5mol / L, the mixed solvent The volume is about 1.51L (i.e. 751ml each of dehydrated ethanol and deionized water), and then doped with crystalline rare earth oxides to control yttrium oxide to account for 7% of the total mass of raw materials (mass fraction, i.e. add 70 grams), cerium oxide and The mass fraction of lanthanum oxide is 10% (mass fraction, that is, add 100 grams each). Add polymer active dispersant-polyethylene glycol PEG20000 and PEG1750 ± 50 each 0.5% (mass fraction, promptly add 5 grams each) in the solution, water bath control temperature is 80 ℃, and keep stirring, then add pH= 9-10 ammonia water, adjust the pH value of the solution with ammonia water positive titration until the pH o...

Embodiment 2

[0042] Embodiment 2: prepare and purify hydroxide sol by the method for embodiment 1. Adjust the feeding rate of the hydroxide sol to 120g / min, and atomize it into droplets of a certain size under the air pressure of 0.5MPa, keep other plasma spraying parameters unchanged, and send the atomized droplets into the plasma flame , and deposited on the substrate to obtain a zirconia coating. Measure the thermal conductivity of the coating that this embodiment prepares with laser scintillation method, measurement result is as table 3; Measure the thermal shock cycle number of this coating with the method for forced air cooling, the result is as table 4; Measure coating with X-ray diffraction The crystal structure, the results are shown in Table 2.

Embodiment 3

[0043] Embodiment 3: adjust the zirconium ion concentration in the solution to 0.8mol / L, prepare and purify hydroxide sol by the method for embodiment 1; Adjust the feed rate of hydroxide sol to 150g / min, and under air pressure It is atomized into droplets of a certain size under 0.5MPa, keeping other plasma spraying parameters unchanged, sending the atomized droplets into the plasma flame, and depositing them on the substrate to obtain a zirconia coating. Measure the thermal conductivity of the coating that this embodiment prepares with laser scintillation method, measurement result is as table 3; Measure the thermal shock cycle number of this coating with the method for forced air cooling, the result is as table 4; Measure coating with X-ray diffraction The results showed that the coating still contained 5% monoclinic zirconia.

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Abstract

The invention relates to a preparation method of a nanometer zirconia heat barrier coating which is mixed with rare-earth oxide and used for liquid-phase plasma spraying. The method comprises that precursor sol is used as a spraying raw material, atomized into fine liquid drops under atomized gas pressure, sent into plasma flame flow and sprayed and deposited on a matrix to obtain the nanometer zirconia heat barrier coating. The precursor sol is hydroxid precursor sol. According to weight proportion, the raw material includes 63 to 73 percent of ZrOCl2.8H2O and 27 to 37 percent of crystalline-state stabilizer oxide which is rare earth oxide. The invention can overcome the problems of poor sol distribution, poor sol flowing performance, chlorid ion erosion, poor sol granule atomizing effect, uneven granule sizes, and the like in the the traditional liquid-phase plasma spraying process. In the invention, a composite coating is prepared, and has the advantages of high depositing efficiency, low cost, wide spraying material, strong adaptability of the liquid-phase precursor, low heat conductivity, good heat and shock resistance, and the like.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a method for preparing a nano-zirconia thermal barrier coating doped with rare earth oxides for liquid plasma ion spraying. Background technique [0002] In order to reduce the fuel consumption of aerospace engines in the future, improve the thrust / weight ratio and service life, a large number of new materials with low density, good room temperature toughness, high temperature resistance and high strength will be used, and heat-resistant, wear-resistant and corrosion-resistant coatings will be widely used. Among them, the thermal barrier coating (thermal barrier coating or TBC) plays a very important role in increasing the operating temperature of the engine. In the past thirty years, people have conducted in-depth research on the materials and preparation methods used in thermal barrier coatings, and found that the ideal thermal barrier coating material is ZrO with low thermal conductivi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/10C23C4/12C23C4/11C23C4/123C23C4/134
CPCY02T50/60
Inventor 程旭东闵捷肖巍叶菲张琦孟令娟
Owner WUHAN UNIV OF TECH
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