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Preparation method of infrared radiation ceramic powder in spinel-silicate multi-phase composite system

A technology of infrared radiation and ceramic powder, which is applied in the field of infrared radiation materials, can solve the problems of complex preparation process of infrared radiation materials, unsatisfactory thermal shock resistance, and reduced infrared radiation performance of materials, so as to achieve excellent infrared radiation performance and shorten The production cycle and the effect of simplifying the production process

Inactive Publication Date: 2012-10-03
WUHAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this kind of infrared radiation material has a large thermal expansion coefficient, and its thermal shock resistance is not ideal.
Adding silicate mineral materials with a lower thermal expansion coefficient to the iron oxide-manganese oxide system can improve its thermal shock resistance. However, the infrared radiation rate of silicate mineral materials is usually relatively low. While improving the thermal shock resistance, it will reduce the infrared radiation performance of the material
Moreover, the preparation process of the infrared radiation material of this composite system is relatively complicated, and it often needs to be obtained through a second firing process, that is, the transition metal oxide forms a spinel solid solution through a solid phase synthesis first, and then through a second solid phase synthesis. Phase synthesis is the final product of spinel solid solution and silicate mineral material to form a multiphase composite structure
The preparation method of the above-mentioned secondary sintering process requires two ball milling, mixing, crushing, pulverizing and sintering, which leads to large energy consumption, low production efficiency and high production cost

Method used

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  • Preparation method of infrared radiation ceramic powder in spinel-silicate multi-phase composite system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] By mass ratio: 20%Fe 2 o 3 , 12%MnO 2 , 2.4%CuO, 2.4%Mo 2 o 3 , 2%V 2 o 5 , 1.2%WO 3 , 20%Al 2 o 3 , 25.1%SiO2 2 , 10%MgO, 1.5%BaO, 1.4%CaO, 1% glass powder and 1%B 2 o 3 Carry out batching, the raw material composition of described glass powder is: 65%SiO 2 , 15%Al 2 o 3 , 5%CaO, 3%BaO, 8%MgO, 2%TiO 2 , 2% ZnO, the above ingredients are ball milled, mixed, dried and pressed into a block body; in the process of firing the above block body, it is first heated to 950 ° C for 4 hours to form a spinel type solid solution, and then continue to heat up to 1200 ° C for 2 hours to form silicate minerals, so that the spinel solid solution and silicate minerals are multi-phase compounded to form a black sintered body with a multi-phase composite structure; after crushing and crushing, Pass through a 320-mesh sieve to prepare spinel-silicate multi-phase composite system ceramic powder with a particle size of less than 47 μm.

[0033] The obtained spinel-silicate mu...

Embodiment 2

[0036] By mass ratio: 11%MnO 2 , 10%Co 2 o 3 , 3%NiO, 5%WO 3 , 50%Al 2 o 3 , 9%SiO2 2 , 6%TiO 2 , 3% CaO, and 3% glass powder for batching, and the raw material composition of glass powder is 65% SiO 2 , 15%Al 2 o 3 , 5%CaO, 3%BaO, 8%MgO, 2%TiO 2 , 2% ZnO, the above ingredients are ball milled, mixed, dried and pressed into a block green body; in the firing preparation process of the above green body, it is first heated to 800°C for 6 hours, and then continues to heat up to 1300°C for heat preservation 6 hours; crushing and pulverizing, passing through a 200-mesh sieve to prepare a spinel-silicate multi-phase composite system ceramic powder with a particle size of less than 74 μm.

[0037] The normal full-band emissivity of the spinel-silicate multiphase composite ceramic powder is 0.90, the emissivity of the 8μm~25μm band is 0.94, the emissivity of the 8μm~14μm band is 0.92, and the radiation of the 14μm~25μm band The rate is 0.94.

Embodiment 3

[0039] By mass ratio: 6%Fe 2 o 3 , 12%CuO, 4%Mo 2 o 3 , 5%V 2 o 5 , 14%Al 2 o 3 , 50%SiO2 2 , 3%MgO, 3%BaO, 3%B 2 o 3 For batching, the above ingredients are ball milled, mixed, dried and pressed into a block-shaped green body; during the firing and preparation of the above-mentioned green body, first heat to 950°C for 2 hours, and then continue to heat to 1200°C for 8 hours and then through crushing and pulverizing, passing through a 400-mesh sieve to prepare a spinel-silicate multi-phase composite system ceramic powder with a particle size of less than 38 μm.

[0040] The normal full-band emissivity of the spinel-silicate multiphase composite ceramic powder is 0.89, the emissivity of the 8μm~25μm band is 0.90, the emissivity of the 8μm~14μm band is 0.90, and the radiation of the 14μm~25μm band The rate is 0.93.

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Abstract

The invention relates to a preparation method of infrared radiation ceramic powder in a spinel-silicate multi-phase composite system. The preparation method comprises the following steps: firstly, various raw materials are taken at a specified ratio, and then the primary processing of milling, mixing, drying and press-molding on the raw materials to form a blocky blank is carried out, and the obtained blocky blank is subjected to heating and heat preservation at the temperature in the range of 800 DEG C to 980 DEG C to form a spinel-type solid solution; then the temperature is continually heated up to 1100 DEG C to 1300 DEG C to heat and preserve heat of the blocky blank to form a silicate mineral, the spinel-type solid solution and the silicate minerals are composited in a multiphase way to form a black sintered body with a multiphase composite structure; and the obtained black sintered body is crushed, ground and sieved, so that the infrared radiation ceramic powder in the spinel-silicate multi-phase composite system can be obtained. The raw materials used in the invention are ordinary raw materials which are extensive in sources, the preparation method is simple and practical, short in production cycle and low in manufacturing cost, can be used in infrared radiation energy-saving coatings, infrared radiant heaters and the like of a high temperature industrial furnace (boiler), and has wide application prospect.

Description

technical field [0001] The invention relates to the field of infrared radiation materials, in particular to a spinel-silicate multiphase composite system infrared radiation ceramic powder which is especially suitable for infrared radiation energy-saving coatings for high-temperature industrial kilns (boilers), infrared radiation heaters and other products The preparation method of the material. Background technique [0002] Infrared radiation materials have attracted extensive attention due to their excellent infrared radiation performance, and have been widely used in energy saving of industrial furnaces, improvement of thermal efficiency of infrared heaters, and thermal control of spacecraft. At present, a variety of infrared radiation ceramic materials have been developed at home and abroad, mainly including zirconia system, zircon sand system, silicon carbide system, chromium oxide system, iron oxide-manganese oxide system, etc. [0003] Among all kinds of infrared radi...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/36C04B35/16C04B35/10C04B35/26C04B35/01C03C12/00
Inventor 黄端平徐庆张枫
Owner WUHAN UNIV OF TECH
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