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Thermal-insulating coating with low thermal conductivity

A technology of thermal insulation coating and content, which is applied in the direction of coating, metal material coating process, fireproof coating, etc., and can solve the problems of reducing engine efficiency and so on

Inactive Publication Date: 2004-05-12
UNITED TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, providing air cooling reduces engine efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Containing 27.3 mol% Y 2 o 3 and balance ZrO 2 sample. Graphite was coated onto a sample pan with a thickness of 0.025″. Specific heat and thermal diffusivity measurements were performed using a laser flash device. The bulk density of the sample was determined by careful measurement of sample dimensions and weight. The data were linearly corrected for theoretical density to calculate a thermal conductivity value of 1.95 W / mK.

Embodiment 2

[0062] A compound containing 16.7 mol% Y 2 o 3 , 16.7mol%Gd 2 o 3 and balance ZrO 2 sample. Graphite was also coated onto samples at a thickness of 0.025″ and measured using a laser flash device. Sample bulk density was determined by careful measurement of sample dimensions and weight. Data measured at 1600°F linearly corrected for theoretical density The average thermal conductivity was calculated to be 1.37W / mK.

Embodiment 3

[0064] The average composition was 19 mol% Sm by electron beam physical vapor deposition 2 o 3 , the balance is ZrO 2 The coating was deposited onto an alumina disk. Pyrometry of thermal conductivity in a laser flash facility. From the previous composition to 33mol% Sm 2 o 3 , balance ZrO 2 High temperature specific heat values ​​were evaluated during the measurement of monolithic samples. The bulk density of the samples was calculated from the change in weight and thickness of the disks and their diameter during the coating process. The average thermal conductivity calculated from data measured at 1400°F without density correction was 1.26 W / mK.

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PUM

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Abstract

A ceramic material having particular utility as a thermal insulating or thermal barrier coating on metallic substrates is provided. The ceramic material broadly comprises at least one lanthanide sesquioxide and the balance comprising a first oxide selected from the group consisting of zirconia, ceria, and hafnia. The lanthanide sesquioxide has a formula A2O3 where A is selected from the group consisting of La, Pr, Nd, Sm, Eu, Tb, In, Sc, Y, Dy, Ho, Er, Tm, Yb, Lu, and mixtures thereof. The present invention also broadly relates to an article having a metal substrate and a thermal barrier coating as discussed above.

Description

technical field [0001] The invention relates to a heat-insulating coating made of a ceramic material and to a metal part provided with such a heat-insulating coating. Such insulating coatings are particularly suitable for use on gas turbine engines. Background technique [0002] Gas turbine engines are very well developed mechanical devices that convert chemical potential energy in the form of fuel into thermal energy and then into mechanical energy for propelling aircraft, generating electricity, pumping fluids, etc. At present, the main feasible way to improve the efficiency of gas turbine engines appears to be to use higher operating temperatures. However, metallic materials currently used in gas turbine engines are very close to the upper limit of their thermal stability. In the hottest parts of modern gas turbine engines, metallic materials are used at gas temperatures above their melting points. They are maintained thanks to air cooling. How...

Claims

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Application Information

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IPC IPC(8): F01D5/28C01F17/224C01G25/02C01G27/02C09D5/18C23C4/10C23C28/00C23C30/00F02C7/00F23R3/42
CPCC04B2235/3206C23C28/345C23C28/3215C04B2235/3229Y02T50/67C04B35/486C04B2235/3208C04B2235/76C04B2235/3286C23C28/3455C04B35/50C04B2235/77C23C4/105C04B2235/3227C04B2235/9607C23C28/321C23C30/00C04B2235/3224C04B2235/3225C04B35/505C04B2235/3244C23C4/11C09D5/18Y02T50/60
Inventor D·A·利顿N·E·乌利安M·F·特鲁贝亚M·J·马罗尼S·G·沃里尔
Owner UNITED TECH CORP
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