Preparation method for hollow microspheres

A hollow microsphere and spherical technology, which is applied in the field of preparation of hollow microspheres, can solve the problems of difficult control of product quality, single preparation method, and difficulty in the thickness of the microsphere shell, and achieve the effect of easy industrial production and simple preparation process

Inactive Publication Date: 2012-01-18
BEIJING BGRIMM ZINC INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of hollow microspheres by spray pyrolysis has the characteristics of simple process and continuous production, but due to the difficulty in controlling the solvent evaporation process, it is difficult to control the morphology of microspheres (including hollow volume, shell thickness, etc.)
[0004] As mentioned above, the existing preparation methods of metal and metal and their oxide composite hollow microspheres are single and not universal. Different preparation systems need to strictly control the relevant conditions, which makes the preparation cost high and the product quality difficult to control. , leading to the fact that such materials have not been widely used commercially

Method used

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Examples

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preparation example Construction

[0024] The embodiment of the present invention provides a method for preparing hollow microspheres, which is a general method for preparing composite hollow microspheres of metals and their oxides. The method includes:

[0025] Spherical alloy powder A x B (1-x) As raw materials, A and B components are metals, A component can use: a combination of one or more metals in lithium, sodium, potassium, magnesium, calcium, strontium, barium, zinc, cadmium, B component Available: magnesium, calcium, strontium, barium, titanium, zirconium, molybdenum, cobalt, tantalum, manganese, iron, nickel, palladium, copper, silver, platinum, zinc, cadmium, aluminum, silicon, gallium, indium, germanium, tin , lead, bismuth, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and the B component is not limited to these Metals, such as tungsten, vanadium, ruthenium are also all possible; 0.4≤xx B (1-x) Calc...

Embodiment 1

[0036] The embodiment of the present invention provides a method for preparing composite hollow microspheres of metals and their oxides, which is a method for preparing composite hollow microspheres of aluminum, aluminum oxide and zinc oxide, which specifically includes the following steps:

[0037] Prepared by atomization method: the component is Zn 0.93 al 0.07 The spherical zinc-aluminum alloy powder is used as the precursor, and 4g of the above raw materials (Zn 0.93 al 0.07 ) on the bottom of the corundum crucible, after high temperature oxidation treatment at 200°C for 5 minutes, transfer to the muffle furnace, calcined at 950°C for 1 hour, take out the crucible, cool to room temperature naturally, and separate the white zinc oxide whiskers on the upper part , metal aluminum and Al can be obtained at the bottom of the crucible 2 o 3 and ZnO composite hollow microspheres. Moreover, the by-product zinc oxide whisker in this embodiment is also a high-performance materi...

Embodiment 2

[0039] The embodiment of the present invention provides a method for preparing metal hollow microspheres, which is a method for preparing nickel hollow microspheres, which specifically includes the following steps:

[0040] Prepared by atomization method: the component is Zn 0.89 Ni 0.11 The spherical zinc-nickel alloy powder is used as the precursor, and 5g of the above raw materials (Zn 0.89 Ni 0.11 ) on the bottom of the corundum crucible, oxidized at 200°C for 5min, then transferred to a muffle furnace, calcined at 1500°C for 1h, took out the crucible, cooled naturally to room temperature, and separated the white zinc oxide whiskers on the upper part. Metal nickel hollow microspheres containing a small amount of zinc oxide can be obtained at the bottom of the crucible;

[0041] The hollow microsphere material prepared by the above method is placed in a 30% NaOH aqueous solution, soaked for 1 hour, filtered and dried to obtain metallic Ni hollow microspheres.

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Abstract

The invention discloses a preparation method for hollow microspheres, and belongs to the fields of powder metallurgy and new material preparation. Micro spherical alloy powder with components of AxB(1-x) (x is more than or equal to 0.4 and less than 1) is used as a raw material in the method. The method comprises the following steps of: forming a layer of oxide micro film on the spherical wall ofthe alloy by pre-oxidation treatment, calcining the treated raw material to evaporate the component A and deposit the component B on the surface of the spherical wall, and thus forming the composite hollow microspheres containing a metal and a metal oxide. The oxide film on the surface of the composite hollow microspheres can be removed by a reduction or dissolution post-treatment process, and the metallic hollow microspheres can be obtained. The method for preparing the hollow microspheres has the characteristics of simplicity in process, controllability in product shape and applicability for large-scale industrial production.

Description

technical field [0001] The invention relates to the fields of powder metallurgy and new material preparation, and relates to a method for preparing hollow microspheres. Background technique [0002] Hollow microspheres refer to a type of spherical shell material with a size ranging from a few nanometers to several millimeters and a hollow structure inside. Due to the unique shape and structure of hollow microspheres, it has the characteristics of low density and large specific surface area, and has excellent mechanical, acoustic, optical and chemical properties, and can be used as drug carriers, pigments, wave-absorbing materials, and sound-proof materials , catalysts and their supports. In recent years, with the increasing research on hollow microspheres, the particularity of its structure and performance has attracted more and more attention. Metal hollow microspheres not only have the remarkable characteristics of low density, but also have excellent thermal stability, ...

Claims

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Application Information

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IPC IPC(8): B22F9/16
Inventor 焦志伟刘葵
Owner BEIJING BGRIMM ZINC INDAL
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