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Preparation method of TiB2 nanometer micrometer structure feeding for hot spraying

A nano-micron, thermal spraying technology, applied in the direction of coating, can solve the problems of low porosity, brittleness reduction, nano powder can not be thermally sprayed, etc., to achieve the effect of uniform particle size distribution

Inactive Publication Date: 2007-03-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ceramic nanostructure coating prepared by thermal spraying has low porosity, improved wear resistance, improved toughness and reduced brittleness
Nano powders cannot be directly used for thermal spraying

Method used

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  • Preparation method of TiB2 nanometer micrometer structure feeding for hot spraying
  • Preparation method of TiB2 nanometer micrometer structure feeding for hot spraying
  • Preparation method of TiB2 nanometer micrometer structure feeding for hot spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: TiB 2 / Al 2 o 3 Preparation of Nanostructured Feedstock

[0019] Take TiB with particle size less than 5μm 2 Powder 250g, Al with a particle size range of 80-200nm 2 o 3 Mix 50g of powder and carry out ball milling. The ball milling medium is deionized water, and then add deionized aqueous solution containing 23g of surfactant to prepare a slurry with a volume of 1L. Ball mill in a high-efficiency vertical ball mill for 1.5hr, and then use 20KHz Ultrasonic treatment for 15min. In this way, a suspension with a certain viscosity is prepared. Spray-dry the prepared suspension in a high-speed electric centrifugal spray-drying equipment. The spray drying parameters are selected as follows: air inlet temperature is 240°C, outlet temperature is 120°C; during the spray drying feeding process, the suspension is heated in a constant temperature water bath at 50°C, the feeding speed is controlled at 4L / hr, and the centrifugal disc speed is controlled at 35000r / mi...

Embodiment 2

[0021] Example 2: TiB 2 / Preparation of SiC nano-microstructure feedstock

[0022] Take TiB with particle size less than 5μm 2 Mix 240g of SiC powder and 160g of SiC powder with a particle size less than 80nm, and perform ball milling for 1hr. Ball milling in a type ball mill for 1.5 hr, followed by 20 KHz ultrasonic treatment for 15 min. In this way, a suspension with a certain viscosity is prepared. Spray-dry the prepared suspension in a high-speed electric centrifugal spray-drying equipment. The spray drying parameters are selected as follows: air inlet temperature is 210°C, outlet temperature is 130°C; during the spray drying feeding process, the suspension is heated in a constant temperature water bath at 75°C, the feeding speed is controlled at 2L / hr, and the centrifugal disc speed is controlled at 25000r / min. Spray drying treatment can obtain 5~75μm TiB 2 / SiC agglomerated powder. The agglomerated powder is heat treated in a vacuum diffusion welding furnace with...

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Abstract

The invention relates to a method for preparing TiB2 nanometer-micrometer feeding material used in thermal plating. Wherein, it mixes TiB2 powder whose diameter granularity is lower than 5 mum with other nanometer particles whose granularity is lower than 0.2 mum; uses wet ball grinding method and ultrasonic wave treatment to obtain nanometer-micrometer suspension; then atomizes and dries said suspension to obtain the group powder of TiB2 nanometer-micrometer structure; then thermally vacuuming the group powder to obtain said TiB2 nanometer-micrometer feeding. The inventive feeding has ball shape, uniform granularity, and flowability at 60-102s / 50g.

Description

Technical field: [0001] A kind of TiB for thermal spraying 2 The invention relates to a preparation method of a feed material with a nano-micron structure, which belongs to the field of powder processing. Background technique: [0002] TiB 2 It has many excellent properties such as high melting point, high hardness, low density, good wear resistance, high chemical corrosion resistance, etc. 3 C 2 The subsequent high-temperature wear-resistant and anti-oxidation materials are widely used in aerospace, weaponry, metallurgy, cutting tools and other fields. It has become a hot material in the research of thermal spraying surface modification. At present, the self-propagating high-temperature synthesis (SHS) method is the most important method for industrial production of high-purity TiB at home and abroad. 2 The main way of powder. However, the shape of powder particles produced in this way is irregular, the particle size is small, the particle size distribution is 0.1-5.0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/10B22F1/00C09D5/00
Inventor 栗卓新程汉池李国栋李红史耀武
Owner BEIJING UNIV OF TECH
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