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A kind of infrared radiation ceramic powder for thermal spraying and its preparation method

A technology of infrared radiation and ceramic powder, applied in the field of new materials, can solve the problems of inability to withstand ultra-high temperature and unsatisfactory heat dissipation performance, and achieve the effect of reducing surface temperature, speeding up heat exchange efficiency and improving heat exchange efficiency

Inactive Publication Date: 2018-07-17
KING STRONG MATERIAL ENG LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem that the heat dissipation performance of existing high-temperature materials is not ideal and cannot withstand ultra-high temperature, the present invention proposes a high-emissivity infrared ceramic powder for thermal spraying and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mix CoO and MnO solid powders with an average particle size of 30 μm in a mass ratio of 38:71, spray and wet the powder with 5% of the total mass of the powder, and cold press it into a green body with a size of 50mm×30mm×10mm. Sinter at 1200°C for 2 hours. After cooling to room temperature, crush and grind the average particle size to below 45 μm, the obtained CoMn 2 o 4 Infrared radiation ceramic powder has a stable spinel structure, the infrared radiation rate at 1200 ° C, 1 ~ 5 μm band is 0.90, and the melting point is 1778 ° C.

[0022] The prepared CoMn 2 o 4 Powder and TiO with an average particle size of 50nm 2 The powder is mixed evenly at a mass ratio of 100:3 for secondary sintering. Spray and humidify the powder with 5% of the total powder mass of water, cold press it into a green body with a size of 50mm×30mm×10mm, then sinter at 1400°C for 1 hour, take it out and immediately put it in water for quenching treatment, and after natural drying, it is crus...

Embodiment 2

[0024] Mix CoO and MnO solid powders with an average particle size of 45 μm in a mass ratio of 38:71, spray and wet the powder with 5% of the total mass of the powder, and cold press it into a green body with a size of 50mm×30mm×10mm. Sinter at 1350°C for 2 hours. After cooling to room temperature, crushing and grinding to below 45 μm, the obtained CoMn 2 o 4 Infrared radiation ceramic powder has a stable spinel structure, the infrared emissivity at 1200°C, 1-5μm band is 0.93, and the melting point is 1784°C.

[0025] The prepared CoMn 2 o 4 Powder and TiO with an average particle size of 100nm 2 Mix evenly at a mass ratio of 100:4 for secondary sintering. First spray and humidify the powder with 5% of the total mass of the powder with water, and cold press it into a green body with a size of 50mm×30mm×10mm. Then sinter at 1400°C for 2 hours, take it out and immediately put it into water for quenching treatment, and after natural drying, it is crushed, ground, and sieved...

Embodiment 3

[0027] Mix CoO and MnO solid powders with an average particle size of 38 μm in a mass ratio of 38:71, spray and wet the powder with 5% of the total mass of the powder, and cold press it into a green body with a size of 50mm×30mm×10mm. Sinter at a high temperature of 1350°C for 1h. After cooling to room temperature, crushing and grinding to below 45 μm, the obtained CoMn 2 o 4 Infrared radiation ceramic powder has a stable spinel structure, the infrared emissivity at 1200°C and 1-5μm band is 0.92, and the melting point is 1790°C.

[0028] The prepared CoMn 2 o 4 Powder and TiO with an average particle size of 75nm 2 Mix evenly at a mass ratio of 100:5 for secondary sintering. First spray and humidify the powder with 5% of the total mass of the powder with water, and cold press it into a green body with a size of 50mm×30mm×10mm. Then sinter at 1400°C for 1 hour, take it out and immediately put it into water for quenching treatment, and after natural drying, it is crushed, ...

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Abstract

The invention discloses an infrared radiation ceramic powder for thermal spraying; the infrared radiation ceramic powder is prepared from the following materials in parts by mass: 100 parts of a CoMn2O4 powder, and 3-5 parts of a TiO2 powder; the CoMn2O4 powder has a spinel structure and is prepared from a CoO solid powder with the average particle size of less than 45 [mu]m and an MnO solid powder with the average particle size of less than 45 [mu]m according to the mass ratio of 38:71; the TiO2 powder has the average particle size of 50-100 nm. The invention also provides a preparation method of the infrared radiation ceramic powder. The infrared radiation ceramic powder provided by the invention can be deposited on the surface of an engine blade, a turbine disc or a supersonic aircraft by ways of explosion spraying, supersonic flame spraying and plasma thermal spraying to form a coating layer. The coating layer has excellent infrared radiation performance, the heat exchange rate of a substrate with the natural environment can be accelerated through enhancement of radiative heat transfer, and the surface temperature of a material is quickly reduced.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a high-emissivity infrared radiation ceramic powder material for thermal spraying and a preparation method thereof. Background technique [0002] Blades and turbine disks are one of the key components of the hot end of aero-engines, so materials are required to have excellent mechanical and heat-resistant properties. Nickel-based superalloys have stable performance at high temperatures, effectively ensuring the reliability and durability of engines for a certain period of time, and have become the materials of choice for manufacturing key hot-end components such as high-pressure turbine disks for advanced aero-engines. With the increase of the thrust-to-weight ratio of aero-engines, the working temperature before the turbines of advanced engines has reached about 1750°C, which requires alloy materials with high temperature-bearing capacity and performance stabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/626
CPCC04B35/01C04B35/626C04B2235/3232C04B2235/3262C04B2235/3275C04B2235/5454C04B2235/763C04B2235/96
Inventor 赵立英王刚吴清军李国太
Owner KING STRONG MATERIAL ENG LTD