Ceramic composite powder for thermal spraying and preparation method of ceramic composite powder

A ceramic composite and thermal spraying technology, applied in coating, fusion spraying, metal material coating process, etc., can solve problems such as unsatisfactory tribological properties, achieve excellent dispersion, reduce oxidation and burning loss, and improve durability abrasive effect

Inactive Publication Date: 2021-02-23
嘉兴市爵拓科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although traditional metal-ceramic composite coatings have good wear resistance, their tribological properties are not ideal. Therefore, in order to adapt to the increasingly harsh working conditions of future engineering parts and wear resistance under various conditions, There is an urgent need to find ceramic phase materials with high hardness, high chemical stability, and low friction coefficient to improve the tribological properties of metal-ceramic composite coatings.

Method used

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  • Ceramic composite powder for thermal spraying and preparation method of ceramic composite powder
  • Ceramic composite powder for thermal spraying and preparation method of ceramic composite powder
  • Ceramic composite powder for thermal spraying and preparation method of ceramic composite powder

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preparation example Construction

[0039] (1) Preparation of modified CBN

[0040] The CBN powder was weighed, washed with absolute ethanol, centrifuged and dried, placed in a muffle furnace, heated to 750° C. in an air atmosphere, and kept for 0.5-1 h to obtain a surface-modified CBN powder.

[0041] (2) Modified TiO 2 preparation

[0042] Mix 1 mL of tetrabutyl titanate and 8 mL of anhydrous ethanol evenly under magnetic stirring, slowly add the mixed liquid dropwise to 10 mL of deionized water, and move the resulting white liquid to a In a 500mL three-necked flask, and placed in a constant temperature water bath, mechanically stirred at 70°C until viscous, and reacted with 20mL of nitric acid solution in a water bath at 65 to 70°C for 3 to 4 hours. After the reaction was completed, the obtained Sol-like TiO 2 ; Distilled under reduced pressure at 60 °C to distill the TiO 2 The wet solid was evaporated to a viscous state, and then rotary evaporated with 30 mL of anhydrous ethanol for 2 to 4 times. After e...

Embodiment 1

[0045] The preparation method of ceramic composite powder for thermal spraying comprises the following steps:

[0046] Dissolve aluminum nitrate nonahydrate in deionized water, prepare an aluminum salt solution with a concentration of 0.15 mol / L, and stir magnetically until the aluminum salt is completely dissolved; add yttrium oxide to deionized water and mix, ultrasonically disperse the yttrium oxide in the water, and disperse the yttrium oxide in the water. Add concentrated nitric acid to the good yttrium oxide suspension, heat and stir in a 50 ℃ water bath until the yttrium oxide is completely dissolved, prepare a yttrium salt solution with a concentration of 0.055mol / L, and then add ammonia water dropwise under the action of magnetic stirring, Until a small amount of white flocculent precipitate appeared in the solution, and a small amount of concentrated nitric acid was added to the white precipitate and disappeared immediately. The prepared yttrium salt solution and the...

Embodiment 2

[0049] The preparation method of ceramic composite powder for thermal spraying comprises the following steps:

[0050] Dissolve aluminum nitrate nonahydrate in deionized water, prepare an aluminum salt solution with a concentration of 0.2 mol / L, stir magnetically until the aluminum salt is completely dissolved; add yttrium oxide into deionized water and mix, ultrasonically disperse the yttrium oxide in the water, and disperse the yttrium oxide in the water. Add concentrated nitric acid to the good yttrium oxide suspension, heat and stir in a 45°C water bath until the yttrium oxide is completely dissolved, prepare a yttrium salt solution with a concentration of 0.1mol / L, and then add ammonia water dropwise under the action of magnetic stirring, Until a small amount of white flocculent precipitate appeared in the solution, and a small amount of concentrated nitric acid was added to the white precipitate and disappeared immediately. The prepared yttrium salt solution and the alum...

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Abstract

The invention discloses ceramic composite powder for thermal spraying and a preparation method of the ceramic composite powder. The ceramic composite powder comprises a core region and a shell layer,wherein the core region is coated with the shell layer; materials forming the core region are composed of modified CBN and modified TiO2; and the shell layer is made of YAG. The preparation method comprises the following steps: uniformly mixing an aluminum salt solution and a yttrium salt solution to obtain an aluminum-yttrium composite solution; dissolving the modified CBN powder and the modifiedTiO2 powder in deionized water, conducting ultrasonic uniform dispersing, and adjusting a pH value to obtain modified CBN/modified CBN mixed slurry; slowly and dropwise adding the aluminum-yttrium composite solution into the mixed slurry, and carrying out stirring, standing and filtering successively to obtain a composite precipitate; and washing, drying and calcining the composite precipitate toobtain the YAG/modified CBN/modified TiO2 ceramic composite powder. The ceramic composite powder has excellent dispersity, wear resistance and oxidation resistance, and is used in a thermal sprayingprocess.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a ceramic composite powder for thermal spraying and a preparation method thereof. Background technique [0002] The thermal spraying method using gas flame or plasma flame is a mature technology for forming high temperature, wear and corrosion resistant coatings on various product surfaces such as objects made of metal, concrete, ceramics, etc. The powder forming the coating is sprayed or sprayed onto the surface of the substrate carried by the flame, so that the particles are melted in the flame and deposited on the surface of the substrate, and then cold-processed to solidify to form the coating. With the increasing application of thermal spray technology and the continuous pursuit of coating performance, thermal spray coatings composed of a single material and with a single structure have been difficult to meet the requirements for use. The thermal sprayed meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46C04B35/626C04B35/624C04B35/628C23C4/10
CPCC04B35/46C04B35/624C04B35/626C04B35/62645C04B35/62813C04B35/62865C04B35/62886C04B2235/3225C04B2235/386C04B2235/96C04B2235/9684C23C4/10
Inventor 不公告发明人
Owner 嘉兴市爵拓科技有限公司
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