Preparation method of Sr, Ni and Cr co-doped LaAlO3 ceramic material and product thereof

A ceramic material and co-doping technology, which is applied in the field of preparation of Sr, Ni and Cr co-doped LaAlO3 ceramic materials, can solve the problems of reducing thermal conductivity and not considering the compactness of lanthanum aluminate ceramic materials.

Active Publication Date: 2020-10-27
长沙麓桥科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above studies did not consider the impact of the compactness of lanthanum aluminate ceramic materials on other properties, and the development of radiation properties with higher near-infrared bands and the reduction of their thermal conductivity are still problems that need to be solved.

Method used

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  • Preparation method of Sr, Ni and Cr co-doped LaAlO3 ceramic material and product thereof

Examples

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Effect test

preparation example Construction

[0023] A kind of Sr, Ni and Cr co-doped LaAlO provided by the invention 3 A method for preparing a ceramic material, comprising the steps of:

[0024] 1) According to the chemical formula La a Sr b Ni c al d Cr e o 3 stoichiometric ratio, wherein a=0.7~0.9, b=0.05~0.15, c=0.05~0.15, d=0.7~0.9, e=0.1~0.3, weigh strontium nitrate, nickel nitrate, chromium nitrate, lanthanum nitrate and Put aluminum nitrate into a beaker, add appropriate amount of distilled water and stir to dissolve;

[0025] 2) Add urea 1 to 1.5 times the total molar amount of metal ions to the beaker under stirring conditions, ultrasonically disperse for 1 to 3 hours, then microwave in a microwave chemical reactor at 70 to 90°C for 1 to 3 hours, and evaporate to obtain intermediate Product A;

[0026] 3) Put product A in a drying oven at 100-140°C for 10-16 hours, then grind the dried sample, then put it in a muffle furnace for 1-3 roasting at 1100-1300°C, take out the sample and wait to cool to room t...

Embodiment 1

[0030] A Sr, Ni and Cr co-doped LaAlO 3 A method for preparing a ceramic material, comprising the steps of:

[0031] 1) According to the chemical formula La a Sr b Ni c Al d Cr e o 3 stoichiometric ratio, where a=0.8, b=0.1, c=0.1, d=0.8, e=0.2, weigh strontium nitrate, nickel nitrate, chromium nitrate, lanthanum nitrate and aluminum nitrate into a beaker, add an appropriate amount of Distilled water was stirred thoroughly to dissolve;

[0032] 2) Add urea 1.5 times the total molar amount of metal ions to the beaker under stirring conditions, ultrasonically disperse for 2 hours, then heat in microwave at 85°C for 2 hours in a microwave chemical reactor, and evaporate to obtain intermediate product A;

[0033] 3) Put the product A in a drying oven at 120°C for 14 hours, then grind the dried sample, then put it into a muffle furnace and bake it at 1250°C for 2 hours, take out the sample and wait for it to cool to room temperature before fully grinding to obtain a loose p...

Embodiment 2

[0036] A Sr, Ni and Cr co-doped LaAlO 3 A method for preparing a ceramic material, comprising the steps of:

[0037] 1) According to the chemical formula La a Sr b Ni c Al d Cr e o 3 stoichiometric ratio, wherein a=0.8, b=0.15, c=0.05, d=085, e=0.15, weigh strontium nitrate, nickel nitrate, chromium nitrate, lanthanum nitrate and aluminum nitrate into a beaker, add an appropriate amount of Distilled water was stirred thoroughly to dissolve;

[0038] 2) Add urea 1 times the total molar amount of metal ions to the beaker under stirring conditions, ultrasonically disperse for 3 hours, then heat in a microwave chemical reactor at 75°C for 3 hours, and evaporate to obtain intermediate product A;

[0039] 3) Put product A in a drying oven at 100°C for 16 hours, then grind the dried sample, then put it into a muffle furnace and bake it at 1300°C for 1 hour, take out the sample and wait for it to cool to room temperature before fully grinding to obtain a loose powder;

[0040...

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Abstract

The invention discloses a preparation method of a Sr, Ni and Cr co-doped LaAlO3 ceramic material and a product thereof. According to the stoichiometric ratio of the chemical formula of LaaSrbNicAldCreO3, the chemical formula of LaaSrbNicAldCreO3 is as shown in the specification, wherein a=0.7-0.9; b = 0.05-0.15, c = 0.05-0.15, d = 0.7-0.9, e=0.1-0. 3, weighing strontium nitrate, nickel nitrate, chromium nitrate, lanthanum nitrate and aluminum nitrate; soluble in water, then adding a certain amount of urea, performing ultrasonic dispersion and microwave heating, drying and roasting, grinding and compression molding, calcining for a period of time to obtain the product, the product is good in compactness and excellent in radiation performance, the infrared emissivity of the product at 0.76-2.5 microns is 0.95-0.97, the thermal conductivity of the product at the temperature of 1200 DEG C is 1.986-2.103 W.m <-1 >. K <-1 >, and the forbidden band width of the product is 1.31-1.35 eV.

Description

technical field [0001] The invention belongs to the field of ceramic preparation, in particular to a kind of Sr, Ni and Cr co-doped LaAlO 3 Preparation methods of ceramic materials and products thereof. Background technique [0002] High-emissivity energy-saving materials are a new type of material widely used in high-temperature energy-saving fields, and in high-temperature environments, radiation heat transfer is the main heat transfer method, and improving the thermal efficiency of high-energy-consuming equipment represented by thermal furnaces is If the radiation heat transfer capacity of thermal equipment is improved. According to Wien's law and Plank's law, the radiant heat under high temperature conditions above 800 °C is mainly concentrated in the near-infrared band of 0.76-2.50 μm, so the field of high-temperature energy saving pays special attention to the emissivity of the near-infrared band. [0003] Currently SiC, SiB 6 Infrared radiation materials such as , ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/622C04B35/626
CPCC04B35/44C04B35/622C04B35/626C04B2235/3213C04B2235/3241C04B2235/3279C04B2235/3227C04B2235/6583C04B2235/656C04B2235/6567C04B2235/768C04B2235/96C04B2235/9607
Inventor 陈能住
Owner 长沙麓桥科技有限公司
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