CN1327883A - Process for preparing nm-class powder - Google Patents
Process for preparing nm-class powder Download PDFInfo
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- CN1327883A CN1327883A CN 01108646 CN01108646A CN1327883A CN 1327883 A CN1327883 A CN 1327883A CN 01108646 CN01108646 CN 01108646 CN 01108646 A CN01108646 A CN 01108646A CN 1327883 A CN1327883 A CN 1327883A
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Abstract
A process for preparing nanometer-level powder includes such steps as preparing micro-class raw material, low-temp freezing to its critical breaking point, and high-speed airflow impact. Its advantages are no secondary pollution and high purity.
Description
Technical field:
What the present invention relates to is a kind of material breaking method, particularly be a kind of breaking method for preparing the nanoscale fine material.
Background technology
The present method that obtains nanometer powder has a variety of, and high-energy ball milling is wherein a kind of.The shortcoming of this method is to exist secondary pollution and mechanical residue to mix, and influences the material interface cleanness; For obtaining to have the nanometer powder of clean interface, commonly used is " cohesion pressurization " and " amorphous crystallization method " at present.The process of " cohesion pressurization " preparation nanometer powder mainly is: (be generally 10 at ultrahigh vacuum
-6Pa) (inert gas (helium) of 50Pa～1KPa) heats high pure raw materials and makes its gasification, and the control gasification rate is protected in certain size range the molecule granularity that is evaporated to charge into low pressure in the preparation room.Nanocrystal evaporation back and intert-gas atoms collision, reduce kinetic energy, be condensate in subsequently with on the condenser wall of cooled with liquid nitrogen, with mechanical means nanocrystal is collected in the ultrahigh vacuum pressue device when extremely a certain amount of, add high pressure and (generally make it moulding, thereby obtain the nano-solid material 1～2GPa).The shortcoming of this method is that complex process, material gasification difficulty is big, processing charges is high, the cycle is long, can not produces in enormous quantities." amorphous crystallization method " preparation nano material be with the amorphous state sample as precursor material, through suitable heat treatment, make amorphous material be transformed into the polycrystalline material that nano-sized grains is formed wholly or in part.The prerequisite of this method is to obtain the amorphous structure material, and in addition, the material of present most amorphous structures is difficult to obtain the material of chunk sizes by the quick setting method preparation.These reasons make amorphous crystallization legal system be equipped with the nano-solid material to have certain limitation.[" the material interface structure and the characteristic " of publishing referring to " Science Press " 1999 (leaf is permanently strong wait show) P.64～67.]
Summary of the invention
The objective of the invention is to overcome expensive, inefficient, big these shortcomings of difficulty of prior art, provide a kind of high efficiency, low cost, enforcement to be easy to the preparation method of nanoscale powder material.This preparation method may further comprise the steps: getting the micron order material is raw material, it is carried out sharp freezing to the broken critical point of splitting of this raw material, again this is in the material that splits broken critical point and sends in the airslide disintegrating mill and to promote the material high-speed impact with high velocity air and pulverize and make nanometer materials.
The present invention combines air-flow crushing technology and sharp freezing technology, according to the material characteristic of desiring comminution of material, with its freeze to material the most cracked split broken critical point (being commonly called as " glass point "), and keep material to be in this critical point state sending into and promote it with high velocity air in the airslide disintegrating mill and pulverize and obtain the nanoscale powder material that high-purity has clean interface with the high-speed motion bump.
The advantage that the present invention compares with present technology is the technology advanced person, avoided mixing of secondary pollution in preparation process and mechanical residue, the produce interface cleanness, pure height, processing charges is cheap, be suitable for production in enormous quantities, and equipment investment is moderate, solved biological material, crystalline material, metalliferous material, chemical substance etc. are difficult to prepare the technical barrier of nanoscale powder material in conventional gas flow crushing process.Can be used for preparing various nanoscale powder materials.
The specific embodiment
Getting micron order thermosetting plastics ABS particle freezed 30 minutes with-100～-120 ℃ in freezing equipment, reach the cracked critical point of this kind material, the material that will be in cracked critical point again remains on to be sent into airslide disintegrating mill and carries out high-speed impact and pulverize and promptly to obtain nanoscale powder material under the cracked critical point state.Can adopt material to clash in opposite directions, head-on collision speed can be per hour 2000 kms.
Claims (1)
1. the preparation method of a nanoscale powder material, it is characterized in that described preparation method may further comprise the steps: getting the micron order material is raw material, it is carried out sharp freezing to the broken critical point of splitting of this raw material, again this is in the material that splits broken critical point and sends in the steam flow pulverizer and to promote the material high-speed impact with high velocity air and pulverize and make nanoscale powder material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108646 CN1327883A (en) | 2001-07-18 | 2001-07-18 | Process for preparing nm-class powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108646 CN1327883A (en) | 2001-07-18 | 2001-07-18 | Process for preparing nm-class powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1327883A true CN1327883A (en) | 2001-12-26 |
Family
ID=4657447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01108646 Pending CN1327883A (en) | 2001-07-18 | 2001-07-18 | Process for preparing nm-class powder |
Country Status (1)
| Country | Link |
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| CN (1) | CN1327883A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106881174A (en) * | 2017-03-30 | 2017-06-23 | 南京航空航天大学 | The preparation method and device of a kind of nano particle |
| CN111303309A (en) * | 2020-02-19 | 2020-06-19 | 王森林 | Microbial polysaccharide extraction element |
-
2001
- 2001-07-18 CN CN 01108646 patent/CN1327883A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106881174A (en) * | 2017-03-30 | 2017-06-23 | 南京航空航天大学 | The preparation method and device of a kind of nano particle |
| CN106881174B (en) * | 2017-03-30 | 2018-10-12 | 南京航空航天大学 | A kind of preparation method and device of nano particle |
| CN111303309A (en) * | 2020-02-19 | 2020-06-19 | 王森林 | Microbial polysaccharide extraction element |
| CN111303309B (en) * | 2020-02-19 | 2021-12-14 | 洛阳市佳运医疗卫生用品有限公司 | Microbial polysaccharide extraction element |
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