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Preparation method of agglomerated composite thermal spraying powder of boride-containing ceramic

A technology of thermal spraying powder and composite powder, which is applied in the field of powder processing and thermal spraying ceramic composite coating, which can solve problems affecting the performance of composite powder, unstable slurry, and difficult feeding, and achieve excellent bulk density, excellent Good fluidity and stability

Inactive Publication Date: 2013-04-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The applicant's patented technology (a TiB-containing coating for thermal spraying piston rings) 2 The preparation method of metal-ceramic composite powder, publication number CN102581292A) also uses this binder to prepare TiB-containing 2 Metal-ceramic composite powder, but it is found that the traditional polyvinyl alcohol (PVA) binder used in the preparation of other ceramic slurries has stable performance, but it is easy to mix with boride-containing ceramic powders when preparing slurries containing boride ceramic powder B on the surface of boride ceramic powder 2 o 3 A gelation reaction occurs to make the slurry gel, and it needs to be heated to above 80°C to decondense, and the decondensation effect is difficult to control, resulting in unstable slurry and difficult feeding, which affects the performance of the composite powder

Method used

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  • Preparation method of agglomerated composite thermal spraying powder of boride-containing ceramic
  • Preparation method of agglomerated composite thermal spraying powder of boride-containing ceramic
  • Preparation method of agglomerated composite thermal spraying powder of boride-containing ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Take commercially available TiB with a particle size of 1-3 microns 2 Add 90g of powder, 60g of Ni powder with a particle size of 1-5 microns into the ball milling tank, then add 200g of absolute ethanol to carry out mixed ball milling for 15 hours, dry the wet-milled powder at 60°C, and sieve and disperse the mixed powder smaller than 3 microns The powder, 150g of deionized water, and 1.5g of ammonium polyacrylate were added to a ball mill jar for ball milling for 1 hour, then 22.5g of polyethylene glycol with a molecular weight of 20,000 was added for ball milling for 10 hours, and the slurry was discharged to obtain a composite powder slurry. If bubbles are generated, add n-butanol defoamer dropwise. The slurry was spray-dried to powder by spray drying equipment, the inlet temperature of the drying equipment was 210° C., the outlet temperature was 110° C., and the frequency of the atomizing disc was 150 Hz to obtain spray-dried powder. Use an Ar atmosphere heat trea...

Embodiment 2

[0027] Take commercially available ZrB with a particle size of 1-3 microns 2 Powder 110g, 1-2 micron particle size ZrO 2 Add 40g of powder into the ball milling tank, then add 200g of absolute ethanol and mix ball milling for 15 hours, dry the wet-milled powder at 60°C, mix the mixed powder smaller than 3 microns after sieving and dispersion with 110g of deionized water, 2g of polyacrylic acid Ammonium was added to a ball mill jar for ball milling for 1.5 hours, then 15 g of polyethylene glycol with a molecular weight of 20,000 and 10 g of polyacrylic acid emulsion were added for ball milling for 12 hours, and the slurry was discharged to obtain a composite powder slurry. If bubbles are generated, add n-butanol defoamer dropwise. The slurry was spray-dried to make powder by using spray drying equipment. The inlet temperature of the drying equipment was 250° C., the outlet temperature was 100° C., and the frequency of the atomizing disc was 280 Hz to obtain spray-dried powder....

Embodiment 3

[0029]Take 109g of commercially available MoB powder with a particle size of 1-10 microns and 41g of Fe powder with a particle size of 1-5 microns into the ball mill tank, then add 210g of absolute ethanol for mixed ball milling for 15 hours, and dry the wet-milled powder at 60°C. Add the mixed powder less than 3 microns after sieving and dispersion, 120g deionized water, and 1.8g ammonium polyacrylate into a ball mill tank for ball milling for 2 hours, then add 35g polyethylene glycol with a molecular weight of 8000 and continue ball milling for 12 hours, and unload the slurry A composite powder slurry is obtained. If bubbles are generated, add n-butanol defoamer dropwise. The slurry was spray-dried to powder by spray drying equipment, the inlet temperature of the drying equipment was 230° C., the outlet temperature was 110° C., and the frequency of the atomizing disc was 150 Hz to obtain spray-dried powder. Use an Ar atmosphere heat treatment furnace to heat-treat the spray...

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Abstract

The invention provides a preparation method of agglomerated composite thermal spraying powder of boride-containing ceramic, which belongs to the field of powder processing and thermally sprayed composite ceramic coatings. According to requirements on elements of the thermal spraying powder, raw materials are subjected to mixing, ball mixing and sieving; a dispersant and water are added for the ball milling again, an adhesive is added after the materials are uniform, and then material slurry is taken out; the material slurry is subjected to spray drying and granulating by a spray drying device, and then the powder subjected to the spray drying is thermally treated. By adopting the preparation method provided by the invention, uniform and stable element distribution in the material slurry is realized, the viscosity of the material slurry is appropriate, the obtained sphere is good, the density is high, the fluidity is good, the apparent density is high and the granularity distribution is uniform, and the method is applicable to thermally sprayed boride-containing composite ceramic powder.

Description

technical field [0001] The invention relates to a method for preparing boride-containing ceramic agglomerated composite thermal spray powder, which belongs to the field of powder processing and thermal spray ceramic composite coating. Background technique [0002] Because boride ceramics have higher hardness, more stable chemical properties and better wear and corrosion resistance than ordinary oxide ceramics and carbide ceramics, boride-containing ceramic composite coatings have been widely developed and applied in recent years. Die cast parts (MoB, Fe 2 B, etc.), galvanized sinking rolls (MoB, etc.), wear-resistant parts (TiB 2 , ZrB 2 etc.) and other special occasions that have high requirements for surface wear resistance and chemical corrosion resistance. [0003] Thermal spraying (plasma spraying, supersonic flame spraying, etc.) is an effective method for preparing ceramic composite coatings. It uses a certain heat source to rapidly heat the spray powder to a molte...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/626
Inventor 栗卓新祝弘滨李辉
Owner BEIJING UNIV OF TECH
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