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Heat-shielding coating material

A heat-insulating coating and compound technology, which is applied in coatings, metal material coating processes, superimposed layer plating, etc., can solve problems such as film cracking or peeling, and achieve difficult cracking or peeling, improved durability, Effect of thermal insulation improvement

Active Publication Date: 2010-08-11
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that cracking or peeling of the film tends to occur due to thickening of the film

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0047] The thermal insulation coating material of the present invention contains Ln 1-x Ta x o 1.5+x or Ln 1-x Nb x o 1.5+x Compounds indicated as hosts. Ln represents one or more selected from Sc, Y and lanthanide elements (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) element.

[0048] ln 1-x Ta x o 1.5+x or Ln 1-x Nb x o 1.5+x Shows lower thermal conductivity than existing rare earth stabilized zirconia. The reason for this is considered to be increased scattering of phonons by irregularizing oxygen vacancies in the structure. Especially when the value of x is 0.13≦x≦0.24, Ln and Ta or Nb form a solid solution, which further increases oxygen vacancies and increases irregularity, so that a thermal barrier coating material with low thermal conductivity can be obtained. It is preferable to set 0.15≦x≦0.23, more preferably 0.18≦x≦0.22, the thermal conductivity can be further reduced.

[0049] ln 1-x Ta x o 1.5+x or Ln 1-x Nb x o 1.5+x The crys...

Embodiment 1

[0054] use it 2 o 5 , Yb 2 o 3 , Y 2 o 3 As a raw material powder, it is weighed according to the desired composition, and solid-phase mixed with a ball mill. After drying the mixed powder, it was calcined at 1400°C. As a result of identifying the calcined powder by powder X-ray diffraction, it was confirmed that no unreacted raw material components remained, and all samples were single-phase.

[0055] Each sample was fired at 1600°C, and a disk-shaped sample with a diameter of 10mmφ and a thickness of 1mm was cut out from the sintered body, and the thermal conductivity was measured by the laser flash method.

[0056] figure 2 Indicates the composition formula Yb 1-x Ta x o 1.5+x The relationship between composition and thermal conductivity. In this figure, the horizontal axis is the composition formula Yb 1-x Ta x o 1.5+x The x value in , the vertical axis is the thermal conductivity. The thermal conductivity is the smallest (about 0.8 W / mK) near x=0.2. When ...

Embodiment 2

[0071] Properly select the type and ratio of elements equivalent to Ln so that the average ionic radius of Ln is less than Use Nb 2 o 5 、Sc 2 o 3 , Y 2 o 3 and trivalent lanthanide oxides (La 2 o 3 、Ce 2 o 3 etc.) as a raw material powder, weighed according to the desired composition, and solid-phase mixed with a ball mill. After drying the mixed powder, it was calcined at 1400°C. As a result of identifying the calcined powder by powder X-ray diffraction, it was confirmed that no unreacted raw material components remained, and all samples were single-phase.

[0072] These samples were fired at 1600°C, and disc-shaped samples with a diameter of 10mmφ and a thickness of 1mm were cut out from the sintered body, and the thermal conductivity was measured by the laser flash method.

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Abstract

Disclosed is a heat-shielding coating material having a lower thermal conductivity than that of rare-earth-stabilized zirconia. Specifically disclosed is a heat-shielding coating material mainly composed of a compound represented by compositional formula (1): Ln1-xTaxO1.5+x [wherein x fulfils the following formula: 0.13<=x<=0.24; and Ln represents at least one element selected from the group consisting of Sc, Y and lanthanoid elements]. Also specifically disclosed is a heat-shielding coating material mainly composed of a compound represented by compositional formula (2): Ln1-xNbxO1.5+x [wherein x fulfils the following formula: 0.13<=x<=0.24; and Ln represents at least one element selected from the group consisting of Sc, Y and lanthanoid elements]. Further specifically disclosed is a heat-shielding coating material mainly composed of a cubic compound having a fluorite structure and represented by compositional formula (3):Ln3NbO7 [wherein Ln represents at least one element selected from the group consisting of Sc, Y and lanthanoid elements].

Description

technical field [0001] The present invention relates to a thermal insulation coating material that can be applied to moving blades, stationary blades, and combustion chambers of gas turbines for power generation, and equipment parts used in high-temperature environments such as jet engines. Background technique [0002] In order to improve the efficiency of gas turbines and jet engines, etc., the temperature of the gas is increasing. In order to protect metal parts from high temperatures (for example, in a gas turbine of the 1700°C class, the maximum surface temperature of the blade is about 1350°C), the surface of the parts is coated with a thermal barrier coating (Thermal Barrier Coating, TBC). As a material of the heat barrier coating, low thermal conductivity ceramics typified by rare earth stabilized zirconia such as yttria stabilized zirconia (YSZ) are used. After the metal joining layer is coated with a vacuum plasma jet or the like on a base material made of metal, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10F01D5/28F02C7/00
CPCC23C28/3455C04B2235/3251C23C4/105C04B35/495F05B2230/90C04B2235/9607C23C28/322C23C30/00C04B2235/3224Y02T50/67C04B2235/3225C04B2235/76C23C4/11Y02T50/60
Inventor 永野一郎鸟越泰治秋山胜德志田雅人森一刚水流靖彦冈田郁生
Owner MITSUBISHI HEAVY IND LTD
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