A high-entropy yttrium pyrochlore ceramic with glass-like thermal conductivity and its preparation method

A technology of thermal conductivity and pyrochlore, which is applied in the field of ceramic materials, can solve problems such as thermal conductivity of unregulated materials, achieve the effect of expanding the composition range and simple manufacturing process

Active Publication Date: 2022-05-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent document on A 2 B 2 o 7 Both the A site and the B site of the oxide type oxide are treated with high entropy, but the thermal conductivity of the material is not regulated

Method used

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  • A high-entropy yttrium pyrochlore ceramic with glass-like thermal conductivity and its preparation method
  • A high-entropy yttrium pyrochlore ceramic with glass-like thermal conductivity and its preparation method
  • A high-entropy yttrium pyrochlore ceramic with glass-like thermal conductivity and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The invention provides a preparation method of high-entropy yttrium pyrochlore ceramics with glass-like thermal conductivity, which specifically comprises the following steps;

[0031] Step 1: Take Y with an average particle size of 0.1 μm and a chemical purity greater than 98.0% 2 O 3 Powder, ZrO 2 Powder, HfO 2 Powder, TiO 2 Powder, Ta 2 O 5 Powder and Nb 2 O 5 Powder, 38.4% Y according to the molar content 2 O 3Powder, with 15.4% molar content of ZrO 2 Powder, 15.4% HfO 2 Powder, 15.4% TiO 2 Powder, 7.7% Ta 2 O 5 Powder and 7.7% Nb 2 O 5 4-5 powders in the powder are mixed by ball milling; the ball milling method is wet roller ball milling, ethanol is the ball milling medium, yttrium stabilized zirconia balls are the grinding balls, and the ball milling mixing time is 8h; the mixed powder is dried and granulated , After passing through a 200-mesh sieve, the green body is obtained by bidirectional pressurization and the pressure is 100MPa;

[0032] St...

Embodiment 2

[0035] The invention provides a preparation method of high-entropy yttrium pyrochlore ceramics with glass-like thermal conductivity, which specifically comprises the following steps;

[0036] Step 1: Take Y with an average particle size of 0.1 μm and a chemical purity greater than 98.0% 2 O 3 Powder, ZrO 2 Powder, HfO 2 Powder, TiO 2 Powder, Ta 2 O 5 Powder and Nb 2 O 5 Powder, 38.4% Y according to the molar content 2 O 3 Powder, with 15.4% molar content of ZrO 2 Powder, 15.4% HfO 2 Powder, 15.4% TiO 2 Powder, 7.7% Ta 2 O 5 Powder and 7.7% Nb 2 O 5 4-5 kinds of powders in the powder are mixed by ball milling; the ball milling method is wet roller ball milling, ethanol is the ball milling medium, yttrium stabilized zirconia balls are the grinding balls, and the ball milling mixing time is 10h; the mixed powder is dried and granulated , After passing through a 200-mesh sieve, the green body is obtained by bidirectional pressurization and the pressure is 100MPa; ...

Embodiment 3

[0040] The invention provides a preparation method of high-entropy yttrium pyrochlore ceramics with glass-like thermal conductivity, which specifically comprises the following steps;

[0041] Step 1: Take Y with an average particle size of 0.1 μm and a chemical purity greater than 98.0% 2 O 3 Powder, ZrO 2 Powder, HfO 2 Powder, TiO 2 Powder, Ta 2 O 5 Powder and Nb 2 O 5 Powder, 38.4% Y according to the molar content 2 O 3 Powder, with 15.4% molar content of ZrO 2 Powder, 15.4% HfO 2 Powder, 15.4% TiO 2 Powder, 7.7% Ta 2 O 5 Powder and 7.7% Nb 2 O 5 4-5 kinds of powders in the powder are mixed by ball milling; the ball milling method is wet roller ball milling, ethanol is the ball milling medium, yttrium-stabilized zirconia balls are the grinding balls, and the ball milling mixing time is 12h; the mixed powder is dried and granulated , After passing through a 200-mesh sieve, the green body is obtained by pressing in two directions and the pressure is 30MPa;

[...

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Abstract

The invention discloses a high-entropy yttrium pyrochlore ceramic with glass-like thermal conductivity and a preparation method thereof, comprising the following steps: 1) adding 33.9% to 43.5% of Y 2 o 3 Powder, ZrO with a molar content of 3.6% to 25.5% 2 Powder, 3.6%~25.5% HfO 2 Powder, 3.6%~25.5% TiO 2 Powder, 0~15.2% Ta 2 o 5 Powder and 0~15.2% Nb 2 o 5 4-5 kinds of powders in the powder are ball-milled and mixed, and the mixed powder is dried, granulated, sieved, and molded to obtain a green body; 2) the green body obtained in step 1 is packed into an alumina crucible and placed in a In the Furnace, the temperature is raised from room temperature to 1400°C to 1650°C at a heating rate of 3°C / min to 10°C / min, kept for 0.5h to 3h, and then cooled to 1000°C at a cooling rate of 5°C / min to 10°C / min ℃, after cooling with the furnace, a high-entropy yttrium pyrochlore ceramic with glass-like thermal conductivity can be obtained. The ceramic prepared by the invention has the characteristics of high density and glass-like relationship of thermal conductivity with temperature.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, in particular to a high-entropy yttrium pyrochlore ceramic with glass-like thermal conductivity and a preparation method thereof. Background technique [0002] Thermal barrier coatings (TBCs) are one of the key technologies and materials in aero-engines, which can effectively reduce the working temperature of heated components and improve the thermal efficiency of the engine. The current mainstream thermal barrier coating ceramic material—yttrium-stabilized zirconia ceramic (YSZ)—has the disadvantages of easy sintering resistance and easy phase transition at high temperature. [0003] Therefore, the development of new thermal barrier coating ceramic materials with excellent high temperature performance is one of the current research hotspots in the field of structural ceramics. Among them, the key performance of this type of ceramic material is low thermal conductivity, such as A 2 B ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/49C04B35/622C04B38/00
CPCC04B35/49C04B35/622C04B38/00C04B2235/3225C04B2235/3251C04B2235/5445C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/76C04B2235/96C04B2235/9607C04B38/0074
Inventor 刘虎林李慧贤刘长青薛云龙伍媛婷
Owner SHAANXI UNIV OF SCI & TECH
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