CN112490098B - Mixed filling powder for hot wire component and preparation method thereof - Google Patents
Mixed filling powder for hot wire component and preparation method thereof Download PDFInfo
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- CN112490098B CN112490098B CN202011426692.8A CN202011426692A CN112490098B CN 112490098 B CN112490098 B CN 112490098B CN 202011426692 A CN202011426692 A CN 202011426692A CN 112490098 B CN112490098 B CN 112490098B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/14—Solid thermionic cathodes characterised by the material
- H01J1/144—Solid thermionic cathodes characterised by the material with other metal oxides as an emissive material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/22—Heaters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/08—Manufacture of heaters for indirectly-heated cathodes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
Abstract
The invention discloses mixed filling powder for a hot wire component and a preparation method thereof. The filling powder comprises the following components in parts by weight: 95-105 parts of alumina powder, 19-21 parts of yttrium oxide powder and 28.5-31.5 parts of tungsten oxide powder.
Description
Technical Field
The invention relates to the field of hot wire components, in particular to mixed filling powder for a hot wire component and a preparation method thereof.
Background
At present, the technology of the fast hot cathode thermal subassembly in foreign countries tends to mature, represented by russia, and the fast hot cathode thermal subassembly (the diameter of the cathode is phi 3.0 mm) developed by the technology is known to have the best result that the fast start time is less than 5 seconds and the related vibration experiment requirements are met. In addition to russia, TMD has been devoted to the development of fast hot cathode thermal subassemblies with high reliability and long lifetime, and TMD can be implemented for cathodes within 3 seconds.
China is still in a starting stage in the aspect of a fast hot cathode heater assembly, the technology is not mature, the starting time of the fast starting cathode heater assembly (the diameter of a cathode is phi 3.2 mm) developed by Nanjing Sanle at present is 8 seconds, and the fast starting cathode heater assembly can bear more than 200 times of impact. 12 the starting time of a small multi-injection cathode component of a missile-borne multi-injection klystron of a ku waveband developed by 12 is 13 seconds. The starting time of a certain power component of the Chengdu optical system is within 5 s; the starting time of the missile-borne traveling wave tube for a certain patrol project is less than 20s.
In view of the above, the conventional hot wire assembly mainly uses alumina as a filling powder, which can basically meet the requirements of the current electric vacuum device, but has certain disadvantages in that the hot wire assembly is rapidly heated and the cathode is rapidly started.
Disclosure of Invention
The invention aims to provide a mixed filling powder for a hot wire component, which can realize quick heat transfer of the hot wire component, thereby realizing quick start of a cathode.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows: the mixed filling powder for the hot wire component comprises the following components in parts by weight: 95-105 parts of alumina powder, 19-21 parts of yttrium oxide powder and 28.5-31.5 parts of tungsten oxide powder.
As a preferable scheme of the invention, the mixed filling powder for the hot wire component comprises the following components in parts by weight: 98-103 parts of alumina powder, 19-20 parts of yttrium oxide powder and 29-31 parts of tungsten oxide powder.
As a preferable scheme of the invention, the mixed filling powder for the hot wire component comprises the following components in parts by weight: 100-101 parts of alumina powder, 19-20 parts of yttrium oxide powder and 30-31 parts of tungsten oxide powder.
As the most preferable scheme of the invention, the mixed filling powder for the hot wire component comprises the following components in parts by weight: 100 parts of alumina powder, 20 parts of yttrium oxide powder and 30 parts of tungsten oxide powder.
In order to achieve better technical effect, the grain diameter of the alumina powder in the mixed filling powder for the hot wire component is limited, namely 3-5 mu m, and the purity is 99.99 percent.
In order to achieve better technical effect, the grain size of yttrium oxide powder in the mixed filler for the hot wire component is limited, namely 3-5 mu m, and the purity is 99.99%.
In order to achieve better technical effect, the particle size of the tungsten oxide powder in the mixed filler for the hot wire component is limited, namely 3-5 μm, and the purity is 99.99%.
The invention also provides a preparation method of the mixed filling powder for the hot wire component, which comprises the following steps:
1) Preparing powder: mixing alumina and yttrium oxide in proportion, and performing ball milling to obtain uniform slurry for later use;
2) And (3) high-temperature sintering: sintering the powder in the step 1) at a high temperature, sieving, and collecting the sieved powder for later use;
3) Mixed tungsten oxide: uniformly mixing the sieved powder collected in the step 2) with tungsten oxide according to the mass ratio of 8:2 to obtain the tungsten oxide powder.
In order to mix the raw materials more uniformly, the mixing method of the step 1) and the step 3) is limited, namely the mixing is carried out on a bottle rolling machine for more than or equal to 24 hours.
In order to achieve better technical effects, the temperature of the high-temperature sintering in the step 2) of the invention is 1860 +/-20 ℃, and 1860 ℃ is preferable; the sintering time is 2-3min, preferably 2min.
Compared with the prior art, the invention has the following advantages:
the mixed filling powder for the hot wire component is a mixture of aluminum oxide and tungsten powder, the color of the filling powder is changed into black, the thermal radiation coefficient of the hot wire can be greatly improved, and meanwhile, the tungsten powder exists in the filling powder, so that the thermal conductivity coefficient of the filling powder can be improved. Under the same conditions, the heat transfer efficiency is higher, and under the same conditions, the cathode starting time can be prolonged, so that the whole tube is developed to the aspect of quick starting.
The heat conductivity (W/cm. K) of the existing hot wire component using the traditional alumina powder as the filler is 0.1, and the specific heat (J/(Kg. K)) is 1250 (900 ℃), but the invention can reduce the starting time of the traditional alumina powder by nearly half in the cathode component with the same structure.
Detailed Description
The present invention will now be described more clearly and completely with reference to the following examples, which are intended to illustrate some, but not all, of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The mixed filling powder for the hot wire component comprises the following components in parts by weight: 105 parts of alumina powder, 19 parts of yttrium oxide powder and 31.5 parts of tungsten oxide powder.
The particle diameters of the alumina powder, the yttrium oxide powder and the tungsten oxide powder are all 3-5 mu m, and the purity is 99.99 percent.
The mixed filling powder for the hot wire component is prepared by the following steps:
1) Preparing powder: mixing alumina and yttrium oxide in proportion, and performing ball milling to obtain uniform slurry for later use;
2) And (3) high-temperature sintering: sintering the powder material obtained in the step 1) at 1860 +/-20 ℃ for 2min, sieving, and collecting the sieved powder material for later use;
3) Mixed tungsten oxide: uniformly mixing the sieved powder collected in the step 2) with tungsten oxide according to the mass ratio of 8:2 to obtain the tungsten oxide powder.
Example 2
The mixed filling powder for the hot wire component comprises the following components in parts by weight: 95 parts of alumina powder, 21 parts of yttrium oxide powder and 28.5 parts of tungsten oxide powder.
The particle diameters of the alumina powder, the yttrium oxide powder and the tungsten oxide powder are all 3-5 mu m, and the purity is 99.99 percent.
The mixed filling powder for the hot wire component is prepared by the following steps:
1) Preparing powder: mixing alumina and yttrium oxide in proportion, and performing ball milling to obtain uniform slurry for later use;
2) And (3) high-temperature sintering: sintering the powder material obtained in the step 1) at 1900 ℃ for 2min, sieving, and collecting the sieved powder material for later use;
3) Mixed tungsten oxide: uniformly mixing the sieved powder collected in the step 2) with tungsten oxide according to the mass ratio of 8:2 to obtain the tungsten oxide powder.
Example 3
The mixed filling powder for the hot wire component comprises the following components in parts by weight: 98 parts of alumina powder, 20 parts of yttrium oxide powder and 29 parts of tungsten oxide powder.
The particle diameters of the alumina powder, the yttrium oxide powder and the tungsten oxide powder are all 3-5 mu m, and the purity is 99.99 percent.
The mixed filling powder for the hot wire component is prepared by the following steps:
1) Preparing powder: mixing alumina and yttrium oxide in proportion, and performing ball milling to obtain uniform slurry for later use;
2) And (3) high-temperature sintering: sintering the powder material obtained in the step 1) at 1860 +/-20 ℃ for 2min, sieving, and collecting the sieved powder material for later use;
3) Mixed tungsten oxide: uniformly mixing the sieved powder collected in the step 2) with tungsten oxide according to the mass ratio of 8:2 to obtain the tungsten oxide powder.
Example 4
The mixed filling powder for the hot wire component comprises the following components in parts by weight: 103 parts of alumina powder, 19 parts of yttrium oxide powder and 31 parts of tungsten oxide powder.
The particle diameters of the alumina powder, the yttrium oxide powder and the tungsten oxide powder are all 3-5 mu m, and the purity is 99.99 percent.
The mixed filling powder for the hot wire component is prepared by the following steps:
1) Preparing powder: mixing alumina and yttrium oxide in proportion, and performing ball milling to obtain uniform slurry for later use;
2) And (3) high-temperature sintering: sintering the powder material obtained in the step 1) at 1900 ℃ for 2min, sieving, and collecting the sieved powder material for later use;
3) Mixed tungsten oxide: uniformly mixing the sieved powder collected in the step 2) with tungsten oxide according to the mass ratio of 8:2 to obtain the tungsten oxide powder.
Example 5
The mixed filling powder for the hot wire component comprises the following components in parts by weight: 100 parts of alumina powder, 20 parts of yttrium oxide powder and 30 parts of tungsten oxide powder.
The particle diameters of the alumina powder, the yttrium oxide powder and the tungsten oxide powder are all 3-5 mu m, and the purity is 99.99 percent.
The mixed filling powder for the hot wire component is prepared by the following steps:
1) Preparing powder: mixing alumina and yttrium oxide in proportion, and performing ball milling to obtain uniform slurry for later use;
2) And (3) high-temperature sintering: sintering the powder material obtained in the step 1) at 1860 +/-20 ℃ for 2min, sieving, and collecting the sieved powder material for later use;
3) Mixed tungsten oxide: uniformly mixing the sieved powder collected in the step 2) with tungsten oxide according to the mass ratio of 8:2 to obtain the tungsten oxide powder.
Example 6
The mixed filling powder for the hot wire component comprises the following components in parts by weight: 101 parts of alumina powder, 19 parts of yttrium oxide powder and 31 parts of tungsten oxide powder.
The particle diameters of the alumina powder, the yttrium oxide powder and the tungsten oxide powder are all 3-5 mu m, and the purities are all 99.99%.
The mixed filling powder for the hot wire component is prepared by the following steps:
1) Preparing powder: mixing alumina and yttrium oxide in proportion, and performing ball milling to obtain uniform slurry for later use;
2) And (3) high-temperature sintering: sintering the powder material obtained in the step 1) at 1900 ℃ for 2min, sieving, and collecting the sieved powder material for later use;
3) Mixed tungsten oxide: uniformly mixing the sieved powder collected in the step 2) with tungsten oxide according to the mass ratio of 8:2 to obtain the tungsten oxide powder.
Example 7
The mixed filling powder for the hot wire component comprises the following components in parts by weight: 100 parts of alumina powder, 20 parts of yttrium oxide powder and 30 parts of tungsten oxide powder.
The particle diameters of the alumina powder, the yttrium oxide powder and the tungsten oxide powder are all 3-5 mu m, and the purity is 99.99 percent.
The mixed filling powder for the hot wire component is prepared by the following steps:
1) Preparing powder: mixing alumina and yttrium oxide in proportion, and performing ball milling to obtain uniform slurry for later use;
2) And (3) high-temperature sintering: sintering the powder material obtained in the step 1) at 1860 +/-20 ℃ for 2min, sieving, and collecting the sieved powder material for later use;
3) Mixed tungsten oxide: uniformly mixing the sieved powder collected in the step 2) with tungsten oxide according to the mass ratio of 8:2 to obtain the tungsten oxide powder.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The mixed filling powder for the hot wire component is characterized by comprising the following components in parts by weight: 95-105 parts of alumina powder, 19-21 parts of yttrium oxide powder and 28.5-31.5 parts of tungsten oxide powder;
the mixed filling powder for the hot wire component is a mixture of aluminum oxide and tungsten powder, and the color of the filling powder is black.
2. The mixed powder filler for hot wire assemblies according to claim 1, wherein the powder filler comprises the following components in parts by weight: 98-103 parts of alumina powder, 19-20 parts of yttrium oxide powder and 29-31 parts of tungsten oxide powder.
3. The mixed powder filler for hot wire assemblies according to claim 1, wherein the powder filler comprises the following components in parts by weight: 100-101 parts of alumina powder, 19-20 parts of yttrium oxide powder and 30-31 parts of tungsten oxide powder.
4. The mixed powder filler for hot wire assemblies according to claim 1, wherein the powder filler comprises the following components in parts by weight: 100 parts of alumina powder, 20 parts of yttrium oxide powder and 30 parts of tungsten oxide powder.
5. The mixed powder filler for hot-wire components as claimed in claim 1, wherein the alumina powder has a particle size of 3~5 μm and a purity of 99.99%.
6. The mixed powder charge for hot-wire assembly of claim 1 wherein said yttrium oxide powder has a particle size of 3~5 μm and a purity of 99.99%.
7. The mixed powder charge for hot wire assembly of claim 1 wherein the tungsten oxide powder has a particle size of 3~5 μm and a purity of 99.99%.
8. A method for preparing a mixed powder charge for a hot-wire assembly according to any one of claims 1 to 7, comprising the steps of:
1) Preparing powder: mixing alumina and yttrium oxide in proportion, and performing ball milling to obtain uniform powder for later use;
2) And (3) high-temperature sintering: sintering the powder in the step 1) at a high temperature, sieving, and collecting the sieved powder for later use;
3) Mixed tungsten oxide: uniformly mixing the sieved powder collected in the step 2) with tungsten oxide according to the mass ratio of 8:2 to obtain mixed filling powder;
4) Sintering the mixed filling powder obtained in the step 3) at 1700 +/-20 ℃ for 2-3min so as to completely fill the filling powder into the hot wire component.
9. The method for preparing the mixed powder filling material for the hot wire component according to claim 8, wherein the step 1) and the step 3) are uniformly mixed for more than or equal to 24 hours on a bottle rolling machine.
10. The method for preparing a mixed powder charge for hot wire assembly of claim 8 wherein the temperature of the high temperature sintering of step 2) is 1860 ± 20 ℃; the sintering time is 2-3min.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1006476A (en) * | 1962-07-30 | 1965-10-06 | Philips Electronic Associated | Improvements in or relating to indirectly-heated cathodes |
| BE823614R (en) * | 1973-12-22 | 1975-06-20 | CATHOD BEAM TUBE WITH FAST RETURNING CATHODE | |
| US4427916A (en) * | 1980-02-15 | 1984-01-24 | Thomson-Csf | Heating element for indirectly heated cathode and method for the manufacture of such an element |
| EP1039503A2 (en) * | 1999-03-19 | 2000-09-27 | TDK Corporation | Electrode |
| JP2012031352A (en) * | 2010-08-03 | 2012-02-16 | Panasonic Corp | Plasma display |
| CN203434117U (en) * | 2013-09-02 | 2014-02-12 | 中国科学院电子学研究所 | Cathode heater assembly |
| CN105931935A (en) * | 2016-04-26 | 2016-09-07 | 北京科技大学 | High-thermal-conductivity insulating medium fast-heating cathode hot wire assembly and preparation method thereof |
| CN107098352A (en) * | 2016-02-20 | 2017-08-29 | 金承黎 | A kind of preparation method of high temperature resistant aeroge and aerogel type porous ceramics |
| CN107331441A (en) * | 2017-07-14 | 2017-11-07 | 安徽华东光电技术研究所 | A kind of cathodes heated indirectly by an el heated filament insulating packing and preparation method thereof |
-
2020
- 2020-12-09 CN CN202011426692.8A patent/CN112490098B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1006476A (en) * | 1962-07-30 | 1965-10-06 | Philips Electronic Associated | Improvements in or relating to indirectly-heated cathodes |
| BE823614R (en) * | 1973-12-22 | 1975-06-20 | CATHOD BEAM TUBE WITH FAST RETURNING CATHODE | |
| US3936367A (en) * | 1973-12-22 | 1976-02-03 | International Standard Electric Corporation | Method of producing a layer of dark colored heat radiating insulating material for heaters of indirectly heated cathodes |
| US4427916A (en) * | 1980-02-15 | 1984-01-24 | Thomson-Csf | Heating element for indirectly heated cathode and method for the manufacture of such an element |
| EP1039503A2 (en) * | 1999-03-19 | 2000-09-27 | TDK Corporation | Electrode |
| JP2012031352A (en) * | 2010-08-03 | 2012-02-16 | Panasonic Corp | Plasma display |
| CN203434117U (en) * | 2013-09-02 | 2014-02-12 | 中国科学院电子学研究所 | Cathode heater assembly |
| CN107098352A (en) * | 2016-02-20 | 2017-08-29 | 金承黎 | A kind of preparation method of high temperature resistant aeroge and aerogel type porous ceramics |
| CN105931935A (en) * | 2016-04-26 | 2016-09-07 | 北京科技大学 | High-thermal-conductivity insulating medium fast-heating cathode hot wire assembly and preparation method thereof |
| CN107331441A (en) * | 2017-07-14 | 2017-11-07 | 安徽华东光电技术研究所 | A kind of cathodes heated indirectly by an el heated filament insulating packing and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 热子及热子组合件的常见问题及解决方法;姜进红;《真空电子技术》;20090625(第03期);全文 * |
| 热阴极的发展现状;方荣等;《真空电子技术》;20150225(第01期);全文 * |
| 高效率快热阴极组件技术;张珂等;《真空科学与技术学报》;20120615(第06期);全文 * |
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