A barium titanate doped modified lanthanum zirconate ceramic material and its preparation method

A ceramic material, lanthanum zirconate technology, applied in barium titanate doped modified lanthanum zirconate ceramic material and its preparation field, can solve the problems of low thermal conductivity, high thermal conductivity, low bending strength, etc., and achieve low thermal conductivity The effect of conductivity, simple process, and enhanced bending strength

Active Publication Date: 2021-04-13
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the existing heat-insulating ceramic materials, especially the problems of high thermal conductivity and low bending strength, so that the application in the collector of traveling wave tubes is limited, and to provide a barium titanate Doped modified lanthanum zirconate ceramic material and preparation method thereof, the process is simple, the prepared ceramic material has low thermal conductivity, significantly improved bending strength, and uniform and compact structure

Method used

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  • A barium titanate doped modified lanthanum zirconate ceramic material and its preparation method
  • A barium titanate doped modified lanthanum zirconate ceramic material and its preparation method
  • A barium titanate doped modified lanthanum zirconate ceramic material and its preparation method

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preparation example Construction

[0046] The preparation method of the described barium titanate doped modified lanthanum zirconate ceramic material, the specific steps are:

[0047] a. Weigh La separately according to the chemical composition ratio 2 o 3 , Y 2 o 3 , ZrO 2 and CeO 2 According to the zirconia ball: the above four raw materials: alcohol = 1: 2: 1 (mass ratio) mixed in a nylon ball mill;

[0048] b. Mix on a ball mill for 6 to 12 hours to obtain a uniformly mixed slurry. At this time, the ball milling medium is alcohol, the ball milling body is a zirconia ball, and the main body is the above four raw materials (La 2 o 3 , Y 2 o 3 , ZrO 2 and CeO 2 );

[0049] c. drying at 60-80°C for 10-16 hours to obtain dry powder;

[0050]d. The dry powder is calcined and synthesized at 1300-1400°C for 2-4 hours, which is the precursor powder obtained by the solid-state reaction method;

[0051] e. Add BaTiO according to the amount added 3 , carry out secondary ball mill drying;

[0052] f. addi...

Embodiment 1

[0056] Preliminary synthesis according to the stoichiometric ratio (La 0.75 Y 0.25 ) 2 (Zr 0.7 Ce 0.3 ) 2 o 7 Precursor, add 5% BaTiO 3 After ball milling, drying, granulation, and molding, it is sintered at 1600°C under normal pressure in an air atmosphere, and the thermal conductivity after sintering is 1.31W·m -1 ·K -1 , the bulk density is 5.76g / cm 3 , The flexural strength is 102.4MPa.

Embodiment 2

[0058] Preliminary synthesis according to the stoichiometric ratio (La 0.75 Y 0.25 ) 2 (Zr 0.7 Ce 0.3 ) 2 o 7 Precursor, add 10% BaTiO 3 After ball milling, drying, granulation, and molding, it is sintered at 1600°C under normal pressure in an air atmosphere, and the thermal conductivity after sintering is 1.14W·m -1 ·K -1 , the bulk density is 5.84g / cm 3 , The flexural strength is 174.7MPa.

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Abstract

The invention relates to a barium titanate doped modified lanthanum zirconate ceramic material and a preparation method thereof. The ceramic material is first synthesized by a solid-state reaction method (La 1‑x Y x ) 2 (Zr 0.7 Ce 0.3 ) 2 o 7 Precursor powder, then add BaTiO 3 After the second ball milling, it is pressed into tablets and sintered at 1600°C to obtain a lanthanum zirconate ceramic material with uniform density, low thermal conductivity and high bending strength. The present invention is based on lanthanum zirconate materials with low thermal conductivity, and uses Y and Ce to replace the precursors with specific chemical composition ratios, and adds BaTiO 3 After high temperature sintering, the process is simple, the obtained ceramic material has high sintering density, and the bending strength is increased by 65% ​​to 227%; the thermal conductivity is 1.20 to 1.50W m ‑1 ·K ‑1 Between them, it can play a role of heat insulation protection in devices such as traveling wave tube collectors and gas turbines, and at the same time prolong the service life of the devices.

Description

technical field [0001] The invention relates to a barium titanate-doped modified lanthanum zirconate ceramic material and a preparation method thereof, belonging to the technical field of heat-insulation material preparation. Background technique [0002] The collector of the traveling wave tube is used to collect the electrons that have exchanged energy with the electromagnetic field. At this time, the electrons still have a high speed and will hit the collector to generate heat. In order to isolate the high temperature heat outside the collector tube from being transmitted to the slow wave tube, it is necessary to use heat-insulating structural materials with high bending strength and low thermal conductivity to keep the microwave tube working normally and reliably. [0003] The dense thermal insulation material reported so far is a high-temperature coating thermal insulation material for the inner wall of a gas engine. This high-temperature insulation material is a rare ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/488C04B35/622C04B35/626C04B35/64
CPCC04B35/488C04B35/622C04B35/62675C04B35/64C04B2235/3215C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3236C04B2235/5436C04B2235/5445C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607
Inventor 桑玲玲冯永宝杨建古加林尹清川李晓云
Owner NANJING TECH UNIV
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