Laminated perovskite structure heat-barrier coating ceramic layer material

A technology of perovskite structure and thermal barrier coating, applied in the field of ceramic layer materials, can solve the problems of volume change of the coating, easy to break, can not meet the design requirements of aero-engine, etc., achieve low thermal conductivity, prevent oxidation and other problems. Effect

Inactive Publication Date: 2007-05-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, YSZ also has its shortcomings: ZrO 2 There are three phase transitions from room temperature to 2370 ° C: monoclinic phase (m) from room temperature to about 1170 ° C, from monoclinic phase to tetragonal phase (t) at about 1170 ° C, and from tetragonal phase at about 2370 ° C For the cubic phase (c)
4% volume shrinkage during the monoclinic to tetragonal phase transition leading to pure ZrO 2 Susceptible to fragmentation under thermal cycling conditions
After 7-8wt.%Y 2 o 3 After partial stabilization, ZrO 2 Cooling from high temperature to r

Method used

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  • Laminated perovskite structure heat-barrier coating ceramic layer material
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preparation example Construction

[0017] The method for preparing a thermal barrier coating ceramic layer material with a layered perovskite structure of the present invention has the following steps:

[0018] The first step: the powder BaCO 3 、TiO 2 , La 2 o 3 、Sm 2 o 3 , and Nd 2 o 3 After grinding for 40-80 minutes by wet ball milling method, a fine powder with a particle size of less than 1 micron is obtained; after drying in a drying oven at 70-300°C for 60-300 minutes, take it out to obtain a dry fine powder for use;

[0019] The second step: weigh the BaCO obtained in the first step 3 Dry fine powder 15~30wt%, TiO 2 dry fine powder 15-30wt% and the balance of dry fine powder rare earth oxide; the precursor is prepared by mixing uniformly;

[0020] The rare earth oxide is La 2 o 3 、Sm 2 o 3 , and Nd 2 o 3 One or a combination of two or three of them, wherein, when two rare earth oxides are selected, the metal ion number ratio is 0.1-1.9:1.9-0.1, and when three rare earth oxides are selecte...

Embodiment 1

[0025] Embodiment 1: make BaLa 0.8 SM 0.6 Nd 0.6 Ti 3 o 10 Ceramic material

[0026] The first step: commercially available barium carbonate BaCO 3 , titanium dioxide TiO 2 , Neodymium trioxide Nd 2 o 3 , Lanthanum trioxide La 2 o 3 and samarium trioxide Sm 2 o 3 After grinding for 40 minutes by wet ball milling, a fine powder with a particle size of less than 1 micron was obtained; after drying in a drying oven at 100°C for 200 minutes, a dry fine powder was obtained, which was taken out for use;

[0027] The second step: take the dry fine powder after the first step treatment, 197.34g of barium carbonate, 239.70g of titanium dioxide, 100.93g of neodymium trioxide, 130.32g of dilanthanum trioxide and 104.64g of samarium trioxide, and mix them uniformly to obtain Precursor;

[0028] The third step: put the precursor obtained in the second step into the SSX high-temperature furnace of Shanghai Experimental Electric Furnace Factory, adjust the temperature to 1500°C,...

Embodiment 2

[0032] Embodiment 2: make BaLa 1.2 SM 0.8 Ti 3 o 10 Ceramic material

[0033] The first step: commercially available barium carbonate BaCO 3 , Lanthanum trioxide La 2 o 3 , Samarium trioxide Sm 2 o 3 , titanium dioxide TiO 2 1. After grinding for 45 minutes by wet ball milling method, a fine powder with a particle size of less than 1 micron is obtained; after drying in a drying oven at 150° C. for 120 minutes, a dry fine powder is obtained for use;

[0034] The second step: take the dry fine powder after the first step treatment, 197.34g of barium carbonate, 195.48g of dilanthanum trioxide, 139.52g of samarium trioxide, and 239.70g of titanium dioxide, and mix them uniformly to obtain a precursor;

[0035] The third step: Put the precursor obtained in the second step into the SSX high-temperature furnace of Shanghai Experimental Electric Furnace Factory, adjust the temperature to 1650°C, keep it at 1650°C for 40 hours, and then cool to room temperature with the furnac...

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Abstract

The invention disclosed a kind of lamellar heat-proof smear layer and ceramic layer material which has the structure of calcium and titanium mine. The chemical formula of the material is BaLn2Ti3O10 in which Ln stands for one kind, two kinds or three kinds of La,Sm and Nd and 0<=x<=0.12,0<=y<=0.12. Because of the adulteration of rare earth ion and the lamellar structure of the calcium and titanium mine, the material has lower heat conductivity and higher coefficient of thermal expansion compared to the zirconium oxide which is stabilized by 7-8% yttrium oxide. After annealing the material at 1500DEG C for 168h the material can still maintain stable. The material can be designed to be heat-proof smear layer materials. The using temperature interval is ambient temperature to 1500DEG C, and the heat conductivity (1200DEG C) interval is 0.47-0.70 Wm-1K-1, the coefficient of thermal expansion (1200DEG C) interval is 11.5-14.0 10-6K-1.

Description

technical field [0001] The present invention relates to a ceramic layer material used as a thermal barrier coating, more particularly to a layered perovskite structure thermal barrier coating ceramic layer material. Background technique [0002] With the development of aero turbine engines in the direction of high flow ratio, high thrust-to-weight ratio and high inlet temperature, higher requirements are placed on the high temperature resistance of high temperature components. For example, the design inlet temperature of an aero-engine with a push ratio of 10 has reached above 1577°C, and the design inlet temperature of an aero-engine with a push ratio of 15 or more will exceed 1727°C. Although after years of development, the applicable temperature of superalloys used for turbine blades has been increased to about 1000°C, and the advanced film cooling technology can reduce the surface temperature of the workpiece by about 400°C, only for aviation with a push ratio of 10 The...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/50C04B35/622
Inventor 车平宫声凯郭洪波徐惠彬郭林
Owner BEIHANG UNIV
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