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Ceramic high-temperature insulation material

A thermal insulation material and high-temperature technology, which is applied in the field of ceramic high-temperature thermal insulation materials with a multi-metal oxide modified perovskite structure, can solve the problem that cannot meet the design and use requirements of high-performance, low-emission gas turbines, and the thermal conductivity of coatings. Rate and elastic modulus increase, damage to the structural integrity of the coating, etc., to achieve low thermal conductivity, reduce thermal conductivity, and improve service life

Active Publication Date: 2011-01-19
INNER MONGOLIA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long-term use temperature of YSZ does not exceed 1200 ° C. As the temperature rises further, the coating will experience serious structural instability.
On the one hand, as the temperature rises, the YSZ coating sinters, which leads to an increase in the thermal conductivity and elastic modulus of the coating, which reduces the strain tolerance of the coating; on the other hand, during the thermal cycle, the YSZ coating Transition from metastable tetragonal to tetragonal and cubic, and then to monoclinic, produces a volume change of about 4%, leading to the formation of cracks in the coating, which destroys the structural integrity of the coating
[0005] As the operating temperature of gas turbines continues to increase, the existing YSZ coating can no longer meet the design and use requirements of the next generation of high-performance, low-emission gas turbines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of ceramic high-temperature insulation material Sr(Zr 0.8 Ta 0.1 Yb 0.1 )O 3 , which includes the following steps:

[0027] (1) Ingredients: SrCO 3 , ZrO 2 、 Ta 2 o 5 oxides and Yb 2 o 3 The oxide powder is mixed in a molar ratio of 1:0.8:0.05:0.05;

[0028] (2) Ball milling: add 2 times the total powder mass of deionized water and ball mill for 24 hours to make a slurry;

[0029] (3) Drying: Pour the ball-milled slurry into a container, put it in a drying oven, and dry it at 100°C for 12 hours;

[0030] (4) Heat treatment: pour the dried powder into a corundum crucible and heat at 1500°C for 24 hours;

[0031] (5) Repeat steps (1)-(4) until the synthesis of single-phase Sr (Zr 0.8 Ta 0.1 Yb 0.1 )O 3 Powder, usually one to three times.

[0032] The material has good phase stability under long-term heat treatment conditions from room temperature to 1400°C and 1450°C, and the thermal conductivity at 1000°C is 1.70Wm -1 K -1 , and u...

Embodiment 2

[0033] Embodiment 2: Adopt the method of embodiment 1 to prepare ceramic high-temperature insulation material Sr (Zr 0.9 sc 0.05 Gd 0.05 )O 2.95 .

[0034] The material has good phase stability under long-term heat treatment conditions from room temperature to 1400°C and 1450°C, and the thermal conductivity at 1000°C is 1.75Wm -1 K -1 , and under the same temperature conditions SrZrO 3 thermal conductivity (~2.10Wm -1 K -1 ) compared to 16.7% lower. The resulting powder is spray granulated to produce a high flowability powder. Prepare a layer of PtAl metal bonding layer 3 with a thickness of about 80 μm on the surface of the nickel-based superalloy substrate 4 by electroplating Pt infiltration with Al, and then apply atmospheric plasma spraying technology to deposit a layer of YSZ with a thickness of about 150 μm on the surface of the PtAl metal bonding layer 3 Ceramic layer 2, and then deposit a layer of Sr (Zr 0.9 sc 0.05 Gd 0.05 )O 2.95 The ceramic layer 1 fina...

Embodiment 3

[0035] Embodiment 3: adopt embodiment 1 method to prepare ceramic high-temperature heat-insulating material Sr (Hf 0.8 Nb 0.1 Dy 0.1 )O 3 . The material has good phase stability under long-term heat treatment conditions from room temperature to 1400°C and 1450°C, and its thermal conductivity at 1000°C is 2.2Wm -1 K -1 , and under the same temperature conditions SrHfO 3 thermal conductivity (~2.70Wm -1 K -1 ) compared to 22.7% lower. The obtained powder was cold-pressed under the condition of 60MPa, and the green body was put into a muffle furnace, and the temperature was raised to 400°C at a heating rate of 3°C / min for 2 hours, and then the heating rate was raised to 1200°C for 4 hours at a heating rate of 2°C / min. , and then cooled to room temperature with the furnace to obtain a target suitable for electron beam physical vapor deposition. Electron beam physical vapor deposition technology is used to deposit a NiCrAlY metal bonding layer 2 with a thickness of about 1...

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Abstract

The invention discloses a ceramic high-temperature insulation material. The material has a chemical formula of Sr1+w(A1-xB'yB''z)O3+delta, wherein A is Zr or Hf or a combination of the Zr or the Hf; B' is one or a combination of more than one of Ta, Nb, Ti or Sc; and B'' is La, Ce, Nd, Sm, Eu, Gd, Dy, Er, Yb, Lu, Y and is one or a combination of more than one of Al, Cr, Co and Ni. A multi-metal oxide-modified perovskite structure ceramic material which has the characteristics of low thermal conductivity and high phase stability is obtained by codoping a plurality of metal oxides.

Description

Technical field: [0001] The invention relates to a ceramic heat insulation material, in particular to a ceramic high temperature heat insulation material with a multi-metal oxide modified perovskite structure with low thermal conductivity and high phase stability. Background technique: [0002] For ground gas turbines and aviation gas turbines, it is necessary to use high temperature protective coatings to protect their hot end components, thereby improving the reliability of gas turbines. As an anti-corrosion and anti-oxidation coating, the alloy coating can slow down the formation of oxides on the surface of the hot end parts under high temperature, aerobic and thermal cycle conditions, thereby prolonging the service life of the hot end parts. However, the maximum service temperature of these alloy coatings is below 1000°C. Thus, even when the gas turbine operates at moderate temperatures, a large amount of cooling gas is required to reduce the temperature of the hot end ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/49C04B35/622
Inventor 马文董红英宋峰雨伦文山滕英跃何伟燕
Owner INNER MONGOLIA UNIV OF TECH
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