Nickel-picotite type infrared radiation ceramic powdered material for thermal spraying and preparation method

A spinel-type, infrared radiation technology, which is applied in the field of surface engineering materials and their preparation, can solve the problems of material thermal emissivity decline and application performance remain unchanged, and achieve slow thermal emissivity decay and low cost performance of coatings , easy to promote the effect

Inactive Publication Date: 2007-01-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the research of thermal radiation materials, there are materials with different component ratios, such as: composite materials of certain mineral raw materials and transition metal oxides, Al 2 o 3 +20%~100%TiO 2 Series Coating Material, TiO 2 +ZrO 2 +Nb 2 o 5 series of materials, etc.; since most of the above-mentioned materials did not form a new stable crystal structure during the compounding process, the application performance remained basically unchanged in the low temperature range from room temperature to 350°C, and crystal transformation occurred due to unstable structures at high temperatures reduce the thermal emissivity of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Equipped with 2 kg of powder material, which contains 65% Cr 2 o 3 , 13% NiO, 4% Nb 2 o 5 , 5% TiB 2 , 8%TiO 2 , 2% SiO 2 and 3% TiN, add 0.05 kg of polyvinyl alcohol adhesive, after mixing thoroughly, then add 0.8 kg of clean water and stir to form a uniform suspension slurry for use.

[0032] Use dry and pure compressed air as the carrying gas, the gas pressure is controlled at 0.8MPa, and the slurry is sprayed into the drying tower with a two-flow nozzle. The atomized slurry particles shrink into a solid spherical shape by their own surface tension, and the hot air In medium drying, the heating temperature of the drying tower heater is controlled between 170±20°C, and the adjustment of the temperature is limited to the sufficient drying of the powder. The dried agglomerated powder is then drawn into a cyclone for collection by means of an aspirator.

[0033] Put the prepared agglomerated powder into a crucible, heat it to 1100°C in a box-type heat treatment fu...

Embodiment 2

[0036] With 1 kg of powder material, which contains 43% Cr 2 o 3 , 35% NiO, 6% Fe 2 o 3 , 5% MnO 2 , 4%TiO 2 and 7% Nb 2 o 5 , add 0.01 kg of dextrin, 0.02 kg of polystyrene and polyvinyl alcohol adhesives, fully mix to form a solid mixture, then add 0.4 kg of clean water and stir to form a uniform suspension slurry for later use.

[0037] Spray the slurry into the drying tower with a centrifugal atomizing nozzle. The rotational speed of the centrifugal atomizer is 800-2000r / min. The atomized slurry particles shrink into a solid spherical shape by their own surface tension and are dried in the hot air. The heating temperature of the drying tower heater is controlled between 200±20°C, and the adjustment of the temperature is limited to the sufficient drying of the powder. The dried agglomerated powder is then drawn into a cyclone for collection by means of an aspirator.

[0038] Put the prepared agglomerated powder into a crucible, heat it in a chamber heat treatment furn...

Embodiment 3

[0041] Equipped with 2 kg of powder material, which contains 38% Cr 2 o 3 , 34% NiO, 8% Nb 2 o 5 , 3% TiB 2 , 4% ZrO 2 , 5%TiO 2 and 8% TiN, add 0.02 kg each of carboxymethyl cellulose and polyvinyl alcohol binder, fully mix to form a solid mixture, then add 0.8 kg of clean water and stir to form a uniform suspension slurry for later use.

[0042] Dry and pure compressed air is used as the carrying gas, the gas pressure is controlled at 0.8MPa, and the slurry is sprayed into the drying tower by a two-flow nozzle. The atomized slurry shrinks into a reunited hollow spherical shape by its own surface tension, and in the hot air Drying, the heating temperature of the drying tower heater is controlled between 260±20°C, and the adjustment of the temperature is limited to the sufficient drying of the powder. The dried agglomerated powder is then drawn into a cyclone for collection by means of an aspirator.

[0043] The agglomerated powder is granulated by plasma spheroidizatio...

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PUM

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Abstract

The Ni-Cr spinel type infrared radiation powder material is prepared by using Cr2O3 and NiO with stable high performance as main components and TiO2, Nb2O5, TiN and TiB2, or Fe2O3 and MnO2, or SiO2 and ZrO2 as supplementary material, and through the steps of mixing powdered solid materials, adding adhesive and water to compound slurry, spray drying to form aggregate powder, and final plasma nodulizing or sintering to densify. The Ni-Cr spinel type infrared radiation powder material has heat radiation factor as high as 0.89-0.93, and may be molten and sprayed via plasma spraying, oxygen-acetylene flame spraying or fuel gas expansion spraying to surface of base body to form firm mechanically combined coating, which has controllable thickness, chemical performance stable in 500-700 deg.c, high heat shock resistance and low heat radiation factor attenuation in long term use.

Description

technical field [0001] The invention relates to a surface engineering material for thermal spraying and a preparation method thereof, in particular to an agglomerated nickel-chromium spinel infrared radiation ceramic powder material for plasma spraying or flame spraying technology and a preparation method thereof. Background technique [0002] In the research of high-temperature thermal emissivity coating materials, ceramic infrared radiation materials are the most eye-catching and valued, and many progresses and achievements have been made. In recent years, the research and application of infrared technology at home and abroad have developed rapidly, mainly manifested in the research and deepening of infrared radiation and absorption mechanism, and the continuous expansion of the application range of infrared technology. In the research of thermal radiation materials, there are materials with different component ratios, such as: composite materials of certain mineral raw ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/12C04B35/622
Inventor 程旭东李丹虹王晋春杨章富
Owner WUHAN UNIV OF TECH
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