Plasma spraying pyrolyzing process of preparing nanometer hollow oxide microsphere powder

A technology of nano-oxide and hollow microspheres, which is applied in the field of powder preparation, can solve the problems of large grain size, complex process, and difficult process control, and achieve uniform powder components without segregation, simple operation methods, and easy control Effect

Inactive Publication Date: 2007-11-07
WUHAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a new preparation method of oxide composite nano-grain hollow sphere powder, s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] In the preparation process of the precursor slurry, ethanol can be added to replace part of the water as a solvent as needed, that is: add volatile, high-flammability ethanol to replace part of the water solvent, and the volume ratio of ethanol to the total solvent is 10-60% , the role of ethanol has been mentioned before.

[0016] The above-mentioned raw materials can be formed into compatible different components according to actual needs. Preparation of various nanocrystalline hollow oxide ceramic powders such as TiO 2 、Cr 2 o 3 、Al 2 o 3 etc., and composite structure powders such as ferrite, stabilized zirconia, aluminum titanate, chromium titanate, etc.

[0017] (2) Precursor atomization: The obtained precursor solution is transported to an atomizing nozzle by a DC pump under a certain power for atomization to form droplets with a particle size as small as possible.

[0018] (3) Plasma spray pyrolysis: Send the atomized liquid droplets into the plasma flame f...

Embodiment 1

[0023] Example 1: Zirconia Partially Stabilized by Yttria (7% Y 2 o 3 / ZrO, PYSZ) powder preparation.

[0024] Mix and dissolve the nitrates of zirconium and yttrium in ethanol+water solution (volume ratio of ethanol to water is 1:1) to obtain 0.5mol / l ZrO 2 -7wt%Y 2 o 3 precursor solution.

[0025] Use a constant flow pump to send the suspension into a plasma flame at a flow rate of 120g / min, spray and pyrolyze it into molten droplets, and inject it into cooling water with a distance of 500mm to obtain hollow spherical structure particles.

[0026] Then collect the particles in the water, filter and dry, dry in an oven at a temperature of ≤200°C, then raise the temperature to 750°C in a box-type electric furnace at a rate of 1.5 / min, and heat-preserve and roast for 2 hours.

[0027] XRD analysis of the resulting solid powder indicated a crystalline yttrium partially stabilized zirconia structure. Observation of its structure with SEM or TEM electron microscope shows tha...

Embodiment 2

[0028] Embodiment 2: aluminum titanate (Alk 2 TiO 5 ) powder preparation.

[0029] Chemically pure Al(NO 3 ) 3 9H 2 O and Ti(OC 4 h 9 )4 for the introduction of Al 2 o 3 and TiO 2 raw materials, according to [Al 3+ ]: [Ti 4+ ]=2:1 proportioning, the aluminum nitrate ethanol solution is mixed with butyl titanate according to the solid-to-liquid ratio of 10:90. Under strong stirring, the precursor sol was obtained after reaction and concentration at 70°C.

[0030] A constant flow pump was used to send the suspension into a plasma flame for spray molding at a flow rate of 150 g / min, and the particles ejected from the plasma flame were collected in cooling water with a spray distance of 450 mm to obtain a hollow spherical structure.

[0031] Then the particles in the water were separated and dried at 150°C to obtain solid powder.

[0032] XRD analysis of the obtained solid powder shows that the solid powder is crystalline aluminum titanate micropowder. Observing its ...

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Abstract

The plasma spraying and pyrolyzing process of preparing nanometer hollow microsphere powder of nanometer crystalline oxide includes preparing precursor solution, atomizing, plasma spraying and pyrolyzing in plasma flame to form solid molten drop, and cooling in liquid to solidify form the hollow spherical nanometer crystal structure. The process is simple and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of powder preparation, in particular to a method for preparing nanometer oxide hollow microsphere powder by using plasma flame high-temperature spray pyrolysis. Background technique [0002] There are many methods for preparing hollow microspheres, which are mainly divided into two categories: template method and non-template method. Template methods are further divided into deposition and surface reaction methods, layer-by-layer assembly methods, microencapsulation methods, etc.; non-template methods are divided into droplet methods, spray drying methods, and emulsion / phase separation methods. Among them, the template method is difficult to control the experimental conditions so that the shell precursor can be effectively and uniformly precipitated and deposited on the surface of the latex particle template, and the operation process is often complicated, and the resulting hollow spheres have a large partic...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/50C04B35/10C04B35/12C04B35/46C04B35/48C04B35/26C04B35/478C04B35/462
Inventor 程旭东张子军陈明邓飞飞高忠宝杨章富毛昉
Owner WUHAN UNIV OF TECH
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