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Magnesia-alumina spinel-silicon nitride-based honeycomb ceramic heat-absorbing body and preparation method thereof

A magnesium-aluminum spinel, honeycomb ceramic technology, applied in ceramic products, other household appliances, applications, etc., can solve the problems of poor anti-oxidation performance, low solar light absorption rate, etc., achieve good anti-oxidation performance and improve absorption effect , the effect of increasing absorption

Active Publication Date: 2017-05-17
河南思特瑞节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although silicon carbide and silicon nitride-based heat absorber materials are widely used, they have disadvantages such as poor oxidation resistance and low solar absorption rate.

Method used

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  • Magnesia-alumina spinel-silicon nitride-based honeycomb ceramic heat-absorbing body and preparation method thereof
  • Magnesia-alumina spinel-silicon nitride-based honeycomb ceramic heat-absorbing body and preparation method thereof
  • Magnesia-alumina spinel-silicon nitride-based honeycomb ceramic heat-absorbing body and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An aluminum spinel-silicon nitride-based honeycomb ceramic heat absorber material, the preparation method of which comprises the following steps:

[0036] 1) Raw material processing: Si3 N 4 、Al 2 o 3 , MgO and TiO 2 The powders are dried at 100°C for standby use, and the particle size of the four powders is 40 μm;

[0037] 2) Mixing of raw materials: Weigh each raw material in proportion, and the mass percentage of each raw material is: Si 3 N 4 60%, Al 2 o 3 26%, MgO 12%, TiO 2 2%, the weighed powder was mixed with a ball mill for 1 hour to obtain a mixed powder; then a plasticizer accounting for 36% of the mass of the mixed powder was added, and mixed with a kneader for 20 minutes to obtain a plastic clay;

[0038] Wherein the plasticizer is composed of carboxymethyl cellulose, tung oil and water, and each component is calculated by mass percentage: carboxymethyl cellulose 8%, tung oil 8%, water 84%;

[0039] 3) Practicing mud and aging: Put the obtained p...

Embodiment 2

[0046] An aluminum spinel-silicon nitride based honeycomb ceramic heat absorber, the preparation method of which comprises the following steps:

[0047] 1) Raw material processing: Si 3 N 4 、Al 2 o 3 , MgO and TiO 2 The powders are dried at 100°C for standby use, and the particle size of the four powders is 60 μm;

[0048] 2) Mixing of raw materials: Weigh each raw material in proportion, and the mass percentage of each raw material is: Si 3 N 4 70%, Al 2 o 3 18%, MgO8%, TiO 2 4%, the weighed powder was mixed with a ball mill for 2 hours to obtain a mixed powder; then a plasticizer accounting for 40% of the mass of the mixed powder was added, and mixed with a kneader for 30 minutes to obtain a plastic clay;

[0049] The plasticizer is composed of binder, lubricant and water, wherein the binder is mixed with carboxymethyl cellulose and polyvinyl alcohol in a mass ratio of 1:1, and the lubricant is made of tung oil and soybean oil in a ratio of 1:1 The mass ratio is m...

Embodiment 3

[0056] An aluminum spinel-silicon nitride based honeycomb ceramic heat absorber, the preparation method of which comprises the following steps:

[0057] 1) Raw material processing: Si 3 N 4 、Al 2 o 3 , MgO and TiO 2 The powders are dried at 100°C for standby use, and the particle size of the four powders is 50 μm;

[0058] 2) Mixing of raw materials: Weigh each raw material in proportion, and the mass percentage of each raw material is: Si 3 N 4 65%, Al 2 o 3 22%, MgO8%, TiO 2 5%, the weighed powder was mixed with a ball mill for 1.5 hours to obtain a mixed powder; then a plasticizer accounting for 45% of the mass of the mixed powder was added, and mixed with a kneader for 25 minutes to obtain a plastic clay;

[0059] Wherein the plasticizer is composed of polyvinyl alcohol, soybean oil and water, and each component is calculated as 9% polyvinyl alcohol, 10% soybean oil and 81% water by mass percentage;

[0060] 3) Practicing mud and aging: Put the obtained plastic ...

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Abstract

The invention discloses a preparation method of a magnesia-alumina spinel-silicon nitride-based honeycomb ceramic heat-absorbing body. Si3N4, Al2O3, MgO and TiO2 powder are taken as raw materials, and a plasticizer is added for preparation of plastic pug; the plastic pug is refined, aged and placed in an extruder to be extruded, and a honeycomb ceramic green body is obtained; the honeycomb ceramic green body is subjected to sectional sizing in a microwave oven; an obtained product is put in an infrared drying oven to be dried and buried in a sagger containing graphite powder and silicon nitride powder, the drying oven is covered with a lid and put in an electric furnace for sintering, and magnesia-alumina spinel-silicon nitride-based antioxidant honeycomb ceramic is obtained. The prepared magnesia-alumina spinel-silicon nitride-based honeycomb ceramic has good antioxidant property, high solar light absorption rate, good thermal shock resistance and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a magnesium aluminum spinel-silicon nitride based honeycomb ceramic heat absorber and a preparation method thereof. Background technique [0002] Tower solar thermal power generation (Solar tower power generation) uses heliostats that can track the movement of the sun to gather sunlight into the heat absorber on the top of the absorption tower, and uses heat absorber materials to convert solar radiation energy into heat transfer fluid The thermal energy is converted into electrical energy through a thermal cycle through a solar thermal power generation system. The heat absorber material is the core of the heat absorber, and it is also the part with the highest working temperature in the whole system, generally reaching 1000-1300°C. Stable and reliable absorber material is the key to determine the efficiency of tower solar thermal power generation. Since the heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/66C04B38/00
CPCC04B35/584C04B35/66C04B38/0006C04B2235/3206C04B2235/3217C04B2235/3222C04B2235/3232C04B2235/3886
Inventor 徐晓虹张亚祥吴建锋
Owner 河南思特瑞节能科技有限公司
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