CN1564296A - Method of utilizing powdered metallurgical process for prepn. of nanotube field emitting cold cathode - Google Patents
Method of utilizing powdered metallurgical process for prepn. of nanotube field emitting cold cathode Download PDFInfo
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- CN1564296A CN1564296A CN 200410014688 CN200410014688A CN1564296A CN 1564296 A CN1564296 A CN 1564296A CN 200410014688 CN200410014688 CN 200410014688 CN 200410014688 A CN200410014688 A CN 200410014688A CN 1564296 A CN1564296 A CN 1564296A
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Abstract
The method include steps: (1) mixing metal powder and nano carbon tubes, grinding the admixture till particle diameter less than 0.5 micro; (2) pressing the admixture to form of cathode; (3) agglomeration in vacuum sintering furnace in vacuum degree higher than 1X10-2Pa, temp 300-2000 deg.C for 0.5-10 hours; (4) removing a layer of metal on surface to make nano carbon tubes be stood out. Ratio between metal powder and nano carbon tubes is from 2:1to 15:1. Advantages are: raising adhesive force, anti bombarding capability and prolong service life of cathode.
Description
Technical field
The present invention relates to a kind of method for preparing carbon nanotube field transmitting cold-cathode, especially pass through the method for the prepared carbon nanotube field transmitting cold-cathode of powder metallurgy.
Background technology
Feds is a kind of cold cathode emission, characteristics such as current density is big, low in energy consumption, response speed is fast, operating temperature range is big, radioresistance, reliability height, therefore to the research of feds very active always, particularly carbon nano-tube has attracted increasing attention with its excellent field emission performance in recent years, for a new direction has been started in the research of feds.The making of general carbon nanotube cathod is the method by chemical vapour deposition (CVD), and the effect through catalyst on backing material grows carbon nano-tube.But adopting the carbon nano-tube of this method preparation mainly is to connect with substrate in the bottom, relatively poor with the adhesion of substrate, can be subjected to ion bombardment and come off from substrate under high effect of electric field, causes emission current obviously to descend.
Summary of the invention
Technical problem: the purpose of this invention is to provide the method that a kind of powder metallurgic method prepares carbon nanotube field transmitting cold-cathode, can significantly improve the adhesive force of carbon nano-tube with the carbon nanotube field transmitting cold-cathode of this method preparation, improve the anti-ion bombardment ability of carbon nano-tube, prolong the life-span of field emission cold-cathode.
Technical scheme: the present invention's powder metallurgical technique, with metal dust with grind after carbon nano-tube is mixed, repressed then and vacuum sintering technology is made bulk material, by the skim metal on erosion removal surface, make carbon nano-tube outstanding from the teeth outwards again so that be easy to generate emission current.Like this, carbon nano-tube will be surrounded by metal material, significantly improve the adhesive force of carbon nano-tube, improve the anti-ion bombardment ability of carbon nano-tube, prolong the life-span of field emission cold-cathode.Concrete processing step is as follows:
A, metal dust is mixed with carbon nano-tube, grind then, the particle diameter after the grinding is less than 0.5 micron;
The mixture of b, the metal dust after will grinding with press and carbon nano-tube is pressed into the shape of negative electrode;
C, be higher than 1 * 10 in vacuum degree
-2Carry out sintering in the vacuum sintering furnace of Pa, the temperature of sintering is 300-2000 degree centigrade, and the time is 0.5-10 hour;
D, remove the skim metal on surface, make carbon nano-tube outstanding with corrosive liquid.
According to used different metal dusty material, the ratio that metal dust mixes with carbon nano-tube is 2: 1 to 15: 1.
At this moment, the outermost layer of cathode surface is the top of carbon nano-tube, and the bottom of carbon nano-tube is embedded in the negative electrode the inside.
Beneficial effect: this method can utilize existing powder metallurgical technique to prepare carbon nanotube field transmitting cold-cathode.Utilize the anti-ion bombardment ability of negative electrode of this method preparation strong, long service life.It comprises that metal dust mixes in proportion with carbon nano-tube, utilizes ball mill that it is ground, press forming, vacuum-sintering, the technology of surface metal corrosion.Use the adhesive force that this technology can improve carbon nano-tube, strengthen the anti-bombardment ability of carbon nano-tube, prolong the life-span of negative electrode.This method goes for multiple metal dust.
Embodiment
Embodiment 1: in this example, we are mixed into example with aluminium powder and carbon nano-tube and illustrate how to realize the present invention.Concrete steps are as follows:
1. with aluminium powder and carbon nano-tube mixed, utilize ball mill to be ground into diameter then at the powder below 0.5 micron by weight 12: 1;
2. utilize press that the mixed powder compaction of aluminium powder and carbon nano-tube is become the needed shape of negative electrode;
3. in vacuum sintering furnace the material that suppresses is carried out sintering, sintering temperature is about 600 degrees centigrade, and temperature retention time is about 1 hour;
4, the material that sinters being put into concentration is that 30% sulfuric acid carries out surface corrosion, removes outermost skim aluminium, makes carbon nano-tube outstanding.
Embodiment 2: in this example, we are mixed into example with molybdenum powder and carbon nano-tube and illustrate how to realize the present invention.Concrete steps are as follows:
1. with molybdenum powder and carbon nano-tube mixed, utilize ball mill to be ground into diameter then at the powder below 0.5 micron by weight 3: 1;
2. utilize press that the mixed powder compaction of molybdenum powder and carbon nano-tube is become the needed shape of negative electrode;
3. in vacuum sintering furnace the material that suppresses is carried out sintering, sintering temperature is about 1500～2000 degrees centigrade, and temperature retention time is about 10 hours;
4. the material that sinters is put into concentration and be 30% nitric acid and carry out surface corrosion, remove outermost skim molybdenum, make carbon nano-tube outstanding.
Claims (3)
1, a kind of powder metallurgic method prepares the method for carbon nanotube field transmitting cold-cathode, it is characterized in that the step for preparing is:
A, metal dust is mixed with carbon nano-tube, grind then, the particle diameter after the grinding is less than 0.5 micron;
The shape of the mixture press forming negative electrode of b, the metal dust after will grinding with press and carbon nano-tube;
C, carry out sintering in vacuum sintering furnace, the temperature of sintering is 300-2000 degree centigrade, and the time is 0.5-10 hour;
D, remove the skim metal on surface, make carbon nano-tube outstanding with corrosive liquid.
2, powder metallurgic method according to claim 1 prepares the method for carbon nanotube field transmitting cold-cathode, it is characterized in that according to used different metal dusty material, the ratio that metal dust mixes with carbon nano-tube is 2: 1 to 15: 1.
3, powder metallurgic method according to claim 1 prepares the method for carbon nanotube field transmitting cold-cathode, it is characterized in that being higher than 1 * 10 in vacuum degree
-2Carry out sintering in the vacuum sintering furnace of Pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100146885A CN1329936C (en) | 2004-04-19 | 2004-04-19 | Method of utilizing powdered metallurgical process for prepn. of nanotube field emitting cold cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100146885A CN1329936C (en) | 2004-04-19 | 2004-04-19 | Method of utilizing powdered metallurgical process for prepn. of nanotube field emitting cold cathode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1564296A true CN1564296A (en) | 2005-01-12 |
| CN1329936C CN1329936C (en) | 2007-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100146885A Expired - Fee Related CN1329936C (en) | 2004-04-19 | 2004-04-19 | Method of utilizing powdered metallurgical process for prepn. of nanotube field emitting cold cathode |
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| CN (1) | CN1329936C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006081715A1 (en) * | 2005-02-07 | 2006-08-10 | Zhongshan University | Printable nano-sized cold cathode slurry and its use |
| CN105810536A (en) * | 2016-03-31 | 2016-07-27 | 电子科技大学 | Magnetron employing combined cold cathode head and production method of cold cathode body |
| CN111128635A (en) * | 2019-12-24 | 2020-05-08 | 中国工程物理研究院应用电子学研究所 | High-current repetition frequency carbon nanotube reinforced silver cold cathode and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4008123B2 (en) * | 1998-06-04 | 2007-11-14 | 株式会社アルバック | Carbon-based ultrafine cold cathode and method for producing the same |
| JP3554238B2 (en) * | 1999-12-20 | 2004-08-18 | シャープ株式会社 | Cold cathode |
| CN1285067C (en) * | 2001-11-29 | 2006-11-15 | 京东方科技集团股份有限公司 | Paneldisplay device based on nano carbon tube and its manufacture method |
| US6798127B2 (en) * | 2002-10-09 | 2004-09-28 | Nano-Proprietary, Inc. | Enhanced field emission from carbon nanotubes mixed with particles |
-
2004
- 2004-04-19 CN CNB2004100146885A patent/CN1329936C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006081715A1 (en) * | 2005-02-07 | 2006-08-10 | Zhongshan University | Printable nano-sized cold cathode slurry and its use |
| CN105810536A (en) * | 2016-03-31 | 2016-07-27 | 电子科技大学 | Magnetron employing combined cold cathode head and production method of cold cathode body |
| CN105810536B (en) * | 2016-03-31 | 2018-01-12 | 电子科技大学 | Using the magnetron of combined type cold cathode head and the production method of cold cathode body |
| CN111128635A (en) * | 2019-12-24 | 2020-05-08 | 中国工程物理研究院应用电子学研究所 | High-current repetition frequency carbon nanotube reinforced silver cold cathode and preparation method thereof |
| CN111128635B (en) * | 2019-12-24 | 2023-04-07 | 中国工程物理研究院应用电子学研究所 | High-current repetition frequency carbon nanotube reinforced silver cold cathode and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN1329936C (en) | 2007-08-01 |
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Granted publication date: 20070801 Termination date: 20100419 |