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Chromic oxide-titanium oxide based high-temperature and high-emissivity coating and preparation method thereof

A high-emissivity, titanium oxide technology, applied in coating, metal material coating process, fusion spraying, etc., can solve problems such as shedding, coating cracking, complex workpieces, etc., and the emissivity will not decay, improve Bonding force, effect of relieving thermal stress

Inactive Publication Date: 2016-08-17
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two methods have their own defects in the application, such as the pressing and sintering molding technology, which is limited by the size of the furnace, and cannot produce large-area and complex-shaped workpieces.
In the second preparation method, after the paint is used for a period of time, the coating will crack and fall off due to the aging of the binder; in addition, most paints are used at medium and high temperatures. Instability will cause the thermal emissivity of the coating to decay easily

Method used

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  • Chromic oxide-titanium oxide based high-temperature and high-emissivity coating and preparation method thereof
  • Chromic oxide-titanium oxide based high-temperature and high-emissivity coating and preparation method thereof
  • Chromic oxide-titanium oxide based high-temperature and high-emissivity coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Add Cr 2 o 3 Powder, TiO 2 Powder and NiO powder are mixed according to a certain ratio, and then the rare earth oxide Tb is added 4 o 7 powder for doping modification;

[0039] The Cr 2 o 3 、TiO 2 , NiO mass ratio is 65:30:5; said rare earth oxide Tb 4 o 7 with Cr 2 o 3 、TiO 2 , The total mass ratio of NiO mixed powder is 5:95;

[0040] The Cr 2 o 3 、TiO 2 , NiO primary particle size is 1 ~ 5μm; the Tb 4 o 7 The original particle size is 5-10μm;

[0041] Step 2: Obtain the mixed material in step 1, add absolute ethanol to obtain a mixed solution, add a binder to the mixed solution, prepare a slurry and ball mill it;

[0042] The quality of the absolute ethanol is 1.5 times of the quality of the mixture; the binder is 3% of the quality of the mixture;

[0043] The binder is a mixture of polystyrene and polyvinyl alcohol, and the mass ratio of polystyrene and polyvinyl alcohol is 30:70;

[0044] The ball milling time is 24 hours; the ball mill...

Embodiment 2

[0058] Step 1: Add Cr 2 o 3 Powder, TiO 2 Powder and NiO powder are mixed according to a certain ratio, and then the rare earth oxide Pr 6 o 11 powder for doping modification;

[0059] The Cr 2 o 3 、TiO 2 , NiO mass ratio is 50:40:10; said rare earth oxide Pr 6 o 11 with Cr 2 o 3 、TiO 2 , The mass ratio of NiO mixed powder is 10:90;

[0060] The Cr 2 o 3 、TiO 2 , NiO primary particle size is 1 ~ 5μm; the Pr 6 o 11 The original particle size is 5-10μm;

[0061] Step 2: Obtain the mixed material in step 1, add absolute ethanol to obtain a mixed solution, add a binder to the mixed solution, prepare a slurry and ball mill it;

[0062] The quality of the absolute ethanol is 1.0 times of the quality of the mixture; the binder is 5% of the quality of the mixture;

[0063] The binder is a mixture of polystyrene and polyvinyl alcohol, and the mass ratio of polystyrene and polyvinyl alcohol is 40:60;

[0064] The ball milling time is 32 hours; the ball milling speed ...

Embodiment 3

[0077] Step 1: Add Cr 2 o 3 Powder, TiO 2 Powder and NiO powder are mixed according to a certain ratio, and then the rare earth oxide La 2 o 3 powder for doping modification;

[0078] The Cr 2 o 3 、TiO 2 , NiO mass ratio is 60:30:10; said rare earth oxide La 2 o 3 with Cr 2 o 3 、TiO 2 , The mass ratio of NiO mixed powder is 5:95;

[0079] The Cr 2 o 3 、TiO 2 , NiO primary particle size is 1 ~ 5μm; said La 2 o 3 The original particle size is 5-10μm;

[0080] Step 2: Obtain the mixed material in step 1, add absolute ethanol to obtain a mixed solution, add a binder to the mixed solution, prepare a slurry and ball mill it;

[0081] The quality of the absolute ethanol is 1.5 times of the quality of the mixture; the binder is 4% of the quality of the mixture;

[0082] The binder is a mixture of polystyrene and polyvinyl alcohol, and the mass ratio of polystyrene and polyvinyl alcohol is 45:55;

[0083] The ball milling time is 38 hours; the ball milling speed is ...

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Abstract

The invention discloses a preparation method of a chromic oxide-titanium oxide based high-temperature and high-emissivity coating and belongs to the technical field of thermal spraying. According to the preparation method, compound powder which is subjected to doping modification with rare earth oxide and contains multiple uniformly distributed oxides is prepared through agglomerating granulation; the compound powder is put in a muffle furnace and subjected to high-temperature sintering densification, dense organic-solvent-free powder with a spinel structural phase is obtained, and the advantageous feature of oxygen cavity defect filling of the rare earth oxide is played. The chromic oxide-titanium oxide based high-temperature and high-emissivity coating is prepared through plasma spraying, the generation of the spinel structural phase in the powder is promoted, and the stability of the coating keeping higher emissivity at the high temperature is improved. The compound powder has better degree of sphericity, the flowing property is 30-60 s / 50 g, and the apparent density is 1.0-3.0 g / cm<3>; the bonding strength of the prepared chromic oxide-titanium oxide based high-temperature and high-emissivity coating is higher than or equal to 20 MPa, and the emissivity at the temperature of 400-600 DEG C is higher than or equal to 0.88.

Description

technical field [0001] The invention relates to a chromium oxide-titanium oxide-based high-temperature high-emissivity coating and a preparation method thereof, belonging to the technical field of thermal spraying. Background technique [0002] High-emissivity materials have important application requirements in the aerospace field. They can be used as a new type of heat-resistant structure for aerospace vehicles. The heat of the substrate is radiated quickly and efficiently by radiation heat dissipation, reducing the temperature of the substrate and solving the problem of the aircraft passing through the atmosphere and returning to the ground. The problem of frictional overheating. In addition, in the high-vacuum environment of the aircraft, the heat generated by the system can only be discharged in the form of radiant energy, so the heat-proof structure in space conditions mainly relies on high-emissivity materials. As the excellent performance of high-emissivity material...

Claims

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Application Information

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IPC IPC(8): C23C4/11C23C4/134C23C4/073
Inventor 杨震晓倪立勇马康智文波杨杰吴朝军
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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