CN100385597C - Method for coating oxide cathode surface - Google Patents
Method for coating oxide cathode surface Download PDFInfo
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- CN100385597C CN100385597C CNB200410073281XA CN200410073281A CN100385597C CN 100385597 C CN100385597 C CN 100385597C CN B200410073281X A CNB200410073281X A CN B200410073281XA CN 200410073281 A CN200410073281 A CN 200410073281A CN 100385597 C CN100385597 C CN 100385597C
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- oxide
- alkaline earth
- earth oxide
- cathode
- overlay
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Abstract
The present invention relates to a method for coating oxide cathode surfaces, particularly to a method for coating an oxide cathode surface in an electron gun for a color picture tube. Firstly, air oxidation processing is carried out on cathode base metal; then, the surface of the cathode base metal is evenly coated with alkaline earth coating layers; finally, the surface of the cathode base metal is coated with alkaline earth coating layers added with scandium oxide. The present invention adopting the double-layer coating method enhances adhesive force between the coating layers and the cathode base metal, and bulge, distortion, and desquamation of the coating layers are avoided; the present invention adopting the cathode in the coating mode can not only meet the requirement of high current density, but also be in accordance with the emission characteristics of cathode ray tubes CRT; the service life of the cathode ray tubes CRT can be prolonged.
Description
Technical field
The present invention relates to a kind of coating method of oxide cathode surface, relate in particular to the coating method of oxide cathode surface in the colorful visualization tube electron gun.
Background technology
Negative electrode is generally by the cathodic metal assembly be coated on the lip-deep alkaline earth oxide in cathode base metal and form, and the main component of alkaline earth oxide is (Ba, Sr, Ca) CO
3In the present technology, for alkaline earth oxide [(Ba, Sr, Ca) CO
3] and added the alkaline earth oxide [(Sc of scandium oxide
2O
3)+(Ba, Sr, Ca) CO
3] the common method that adopts following two kinds of individual layers coating of coating on the surface, cathode base metal, the one, coating one deck alkaline earth oxide (Ba, Sr, Ca) CO on the Base Metal surface
3, the 2nd, coating one deck has added the alkaline earth oxide [(Sc of scandium oxide on the Base Metal surface
2O
3)+(Ba, Sr, Ca) CO
3].Adopt the negative electrode of first kind of application pattern, its working current density is less, can not satisfy the requirement of high current density; In second kind of application pattern, because the cathode base metal is different with the thermal expansion between the overlay, when working long hours, bonding force between overlay and the Base Metal can descend, special centre in the cathode base metal, overlay has the possibility of heaving, and under the individual cases, the warping of overlay, obscission also can occur.
Summary of the invention
The application pattern that the purpose of this invention is to provide a kind of oxide cathode surface adopts the negative electrode of this application pattern, both can satisfy the requirement of high current density, can improve the phenomenon that overlay warps, comes off again.
The technical solution used in the present invention is: at first air-heating furnace is put in the cathode base metal, under 740 ℃～800 ℃ temperature, carry out 8～12 minutes heat treated, getting 36.1%～46.1% alkaline earth oxide by weight percentage mixes with 53.9%～63.9% binding agent to put into and rolls bottle machine rolling and made suspension in 24-45 hour, scandium oxide is mixed with alkaline earth oxide, get 36.1%～46.1% interpolation by weight percentage the alkaline earth oxide of scandium oxide mix with 53.9%～63.9% binding agent and put into bottle machine that rolls and roll and made suspension in 2445 hours, it is characterized in that further comprising the steps of: use spray gun on the cathode base metal, evenly to apply ground floor alkaline earth oxide overlay, evenly apply the alkaline earth oxide overlay that the second layer has added scandium oxide again.
The percentage by weight of scandium oxide and alkaline earth oxide is 0.01%～15%, and it is the nitrocellulose solution of 31.7S that binding agent can adopt viscosity, and alkaline earth oxide is an eutectic.
The thickness of ground floor alkaline earth oxide overlay is 13 μ m～32 μ m, the thickness that the second layer has added the alkaline earth oxide overlay of scandium oxide is 45 μ m～60 μ m, the overlay density of alkaline earth oxide overlay that ground floor alkaline earth oxide overlay and the second layer have added scandium oxide is identical, is 1.05～1.35g/cm
3
The invention has the beneficial effects as follows: after handled through air oxidation the cathode base metal, its rough surface had certain benefit to the tack that increases overlay; Apply one deck alkaline earth oxide earlier, the adhesive force between alkaline earth oxide and the cathode base metal is better, is difficult for producing the overlay obscission; Adopt the method for this two-layer coating, increased the adhesive force of overlay, improved the negative electrode reliability, can satisfy the requirement of high current density, and adopt the negative electrode of this application pattern, and satisfy the emission characteristics of cathode-ray tube CRT fully, can prolong the useful life of cathode-ray tube CRT.
Description of drawings
Accompanying drawing is a structural representation of the present invention.
1. cathode base metals among the figure, 2. ground floor alkaline earth oxide overlay, 3. the second layer has added the alkaline earth oxide overlay of scandium oxide.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further details.
At first air-heating furnace is put in cathode base metal 1, under 740 ℃～800 ℃ temperature, carry out 8～12 minutes heat treated, getting 36.1%～46.1% alkaline earth oxide by weight percentage mixes with 53.9%～63.9% binding agent to put into and rolls bottle machine rolling and made suspension in 24-45 hour, scandium oxide is mixed with alkaline earth oxide, get 36.1%～46.1% interpolation by weight percentage the alkaline earth oxide of scandium oxide mix with 53.9%～63.9% binding agent to put into and roll bottle machine rolling and made suspension in 24-45 hour, use spray gun on cathode base metal 1, evenly to apply ground floor alkaline earth oxide overlay 2, thickness is 13 μ m～32 μ m, and cathode density is 1.05～1.35g/cm
3, evenly applying the alkaline earth oxide overlay 3 that the second layer has added scandium oxide again, thickness is 45 μ m～60 μ m, cathode density is 1.05～1.35g/cm
3It is the nitrocellulose solution of 31.7S that binding agent can adopt viscosity, and the percentage by weight of scandium oxide and alkaline earth oxide is 0.01%～15%.
Embodiment 1
At first air-heating furnace is put in cathode base metal 1, under 740 ℃ of temperature, carry out 12 minutes heat treated, the nitrocellulose solution of getting 46.1% alkaline earth oxide and 53.9% viscosity by weight percentage and be 31.7S mixes to be put into bottle machine that rolls and rolls and made suspension in 24 hours, scandium oxide is mixed with alkaline earth oxide, get 36.1% interpolation by weight percentage alkaline earth oxide and 63.9% the viscosity of scandium oxide be that the nitrocellulose solution of 31.7S mixes and puts into bottle machine that rolls and roll and made suspension in 30 hours, use spray gun on cathode base metal 1, evenly to apply ground floor alkaline earth oxide overlay 2, thickness is 15 μ m, and cathode density is 1.05g/cm
3, evenly applying the alkaline earth oxide overlay 3 that the second layer has added scandium oxide again, thickness is 55 μ m, cathode density is 1.05g/cm
3The percentage by weight of scandium oxide and alkaline earth oxide is 1%.
At first air-heating furnace is put in cathode base metal 1, under 780 ℃ of temperature, carry out 8 minutes heat treated, the nitrocellulose solution of getting 36.1% alkaline earth oxide and 63.9% viscosity by weight percentage and be 31.7S mixes to be put into bottle machine that rolls and rolls and made suspension in 30 hours, scandium oxide is mixed with alkaline earth oxide, get 36.1% interpolation by weight percentage alkaline earth oxide and 63.9% the viscosity of scandium oxide be that the nitrocellulose solution of 31.7S mixes and puts into bottle machine that rolls and roll and made suspension in 45 hours, use spray gun on cathode base metal 1, evenly to apply ground floor alkaline earth oxide overlay 2, thickness is 13 μ m, and cathode density is 1.2g/cm
3, evenly applying the alkaline earth oxide overlay 3 that the second layer has added scandium oxide again, thickness is 45 μ m, cathode density is 1.2g/cm
3The percentage by weight of scandium oxide and alkaline earth oxide is 0.01%.
Embodiment 3
At first air-heating furnace is put in cathode base metal 1, under 750 ℃ of temperature, carry out 10 minutes heat treated, the nitrocellulose solution of getting 40% alkaline earth oxide and 60% viscosity by weight percentage and be 31.7S mixes to be put into bottle machine that rolls and rolls and made suspension in 35 hours, scandium oxide is mixed with alkaline earth oxide, get 46.1% interpolation by weight percentage alkaline earth oxide and 53.9% the viscosity of scandium oxide be that the nitrocellulose solution of 31.7S mixes and puts into bottle machine that rolls and roll and made suspension in 24 hours, use spray gun on cathode base metal 1, evenly to apply ground floor alkaline earth oxide overlay 2, thickness is 25 μ m, and cathode density is 1.3g/cm
3, evenly applying the alkaline earth oxide overlay 3 that the second layer has added scandium oxide again, thickness is 50 μ m, cathode density is 1.3g/cm
3The percentage by weight of scandium oxide and alkaline earth oxide is 3%.
Embodiment 4
At first air-heating furnace is put in cathode base metal 1, under 800 ℃ of temperature, carry out 11 minutes heat treated, the nitrocellulose solution of getting 43% alkaline earth oxide and 57% viscosity by weight percentage and be 31.7S mixes to be put into bottle machine that rolls and rolls and made suspension in 45 hours, scandium oxide is mixed with alkaline earth oxide, get 45% interpolation by weight percentage alkaline earth oxide and 55% the viscosity of scandium oxide be that the nitrocellulose solution of 31.7S mixes and puts into bottle machine that rolls and roll and made suspension in 40 hours, use spray gun on cathode base metal 1, evenly to apply ground floor alkaline earth oxide overlay 2, thickness is 32 μ m, and cathode density is 1.35g/cm
3, evenly applying the alkaline earth oxide overlay 3 that the second layer has added scandium oxide again, thickness is 60 μ m, cathode density is 1.35g/cm
3The percentage by weight of scandium oxide and alkaline earth oxide is 10%.
Embodiment 5
At first air-heating furnace is put in cathode base metal 1, under 760 ℃ of temperature, carry out 9 minutes heat treated, the nitrocellulose solution of getting 38% alkaline earth oxide and 62% viscosity by weight percentage and be 31.7S mixes to be put into bottle machine that rolls and rolls and made suspension in 40 hours, scandium oxide is mixed with alkaline earth oxide, get 40% interpolation by weight percentage alkaline earth oxide and 60% the viscosity of scandium oxide be that the nitrocellulose solution of 31.7S mixes and puts into bottle machine that rolls and roll and made suspension in 43 hours, use spray gun on cathode base metal 1, evenly to apply ground floor alkaline earth oxide overlay 2, thickness is 20 μ m, and cathode density is 1.1g/cm
3, evenly applying the alkaline earth oxide overlay 3 that the second layer has added scandium oxide again, thickness is 48 μ m, cathode density is 1.1g/cm
3The percentage by weight of scandium oxide and alkaline earth oxide is 15%.
Embodiment 6
At first air-heating furnace is put in cathode base metal 1, under 770 ℃ of temperature, carry out 10 minutes heat treated, the nitrocellulose solution of getting 45% alkaline earth oxide and 55% viscosity by weight percentage and be 31.7S mixes to be put into bottle machine that rolls and rolls and made suspension in 43 hours, scandium oxide is mixed with alkaline earth oxide, get 46.1% interpolation by weight percentage alkaline earth oxide and 53.9% the viscosity of scandium oxide be that the nitrocellulose solution of 31.7S mixes and puts into bottle machine that rolls and roll and made suspension in 24 hours, use spray gun on cathode base metal 1, evenly to apply ground floor alkaline earth oxide overlay 2, thickness is 30 μ m, and cathode density is 1.35g/cm
3, evenly applying the alkaline earth oxide overlay 3 that the second layer has added scandium oxide again, thickness is 58 μ m, cathode density is 1.35g/cm
3The percentage by weight of scandium oxide and alkaline earth oxide is 8%.
Claims (6)
1. the coating method of an oxide cathode surface, at first cathode base metal (1) is put into air-heating furnace, under 740 ℃～800 ℃ temperature, carry out 8～12 minutes heat treated, getting 36.1%～46.1% alkaline earth oxide by weight percentage mixes with 53.9%～63.9% binding agent to put into and rolls bottle machine rolling and made suspension in 24-45 hour, scandium oxide is mixed with alkaline earth oxide, get 36.1%～46.1% interpolation by weight percentage the alkaline earth oxide of scandium oxide mix with 53.9%～63.9% binding agent to put into and roll bottle machine rolling and made suspension in 24-45 hour, it is characterized in that further comprising the steps of: (1) upward evenly applies ground floor alkaline earth oxide overlay (2) in the cathode base metal to use spray gun, evenly applies the alkaline earth oxide overlay (3) that the second layer has added scandium oxide again.
2. the coating method of a kind of oxide cathode surface according to claim 1 is characterized in that, the percentage by weight of said scandium oxide and alkaline earth oxide is 0.01%～15%.
3. the coating method of a kind of oxide cathode surface according to claim 1 is characterized in that, said binding agent is a nitrocellulose solution, and viscosity is 31.7S.
4. the coating method of a kind of oxide cathode surface according to claim 1 is characterized in that, said alkaline earth oxide is an eutectic.
5. the coating method of a kind of oxide cathode surface according to claim 1, it is characterized in that, the thickness of ground floor alkaline earth oxide overlay (2) is 13 μ m～32 μ m, and the thickness that the second layer has added the alkaline earth oxide overlay (3) of scandium oxide is 45 μ m～60 μ m.
6. the coating method of a kind of oxide cathode surface according to claim 1, it is characterized in that, the overlay density of alkaline earth oxide overlay (3) that ground floor alkaline earth oxide overlay (2) and the second layer have added scandium oxide is identical, is 1.05～1.35g/cm
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410073281XA CN100385597C (en) | 2004-11-16 | 2004-11-16 | Method for coating oxide cathode surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410073281XA CN100385597C (en) | 2004-11-16 | 2004-11-16 | Method for coating oxide cathode surface |
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| Publication Number | Publication Date |
|---|---|
| CN1606118A CN1606118A (en) | 2005-04-13 |
| CN100385597C true CN100385597C (en) | 2008-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410073281XA Expired - Fee Related CN100385597C (en) | 2004-11-16 | 2004-11-16 | Method for coating oxide cathode surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106807601A (en) * | 2017-03-13 | 2017-06-09 | 中国科学院海洋研究所 | A kind of method for preparing semiconductor powder film photoelectric electrode |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6054800A (en) * | 1997-12-30 | 2000-04-25 | Samsung Display Devices Co., Ltd. | Cathode for an electron gun |
| CN1277453A (en) * | 1999-06-14 | 2000-12-20 | 株式会社日立制作所 | Cathode-ray tube with improved cathode |
| JP2001176375A (en) * | 1999-12-15 | 2001-06-29 | Mitsubishi Electric Corp | Oxide cathode and its manufacturing method |
-
2004
- 2004-11-16 CN CNB200410073281XA patent/CN100385597C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6054800A (en) * | 1997-12-30 | 2000-04-25 | Samsung Display Devices Co., Ltd. | Cathode for an electron gun |
| CN1277453A (en) * | 1999-06-14 | 2000-12-20 | 株式会社日立制作所 | Cathode-ray tube with improved cathode |
| JP2001176375A (en) * | 1999-12-15 | 2001-06-29 | Mitsubishi Electric Corp | Oxide cathode and its manufacturing method |
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|---|---|
| CN1606118A (en) | 2005-04-13 |
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