CN1530999A - Fe-Cr-Ni alloy as electron gun electrodes - Google Patents

Fe-Cr-Ni alloy as electron gun electrodes Download PDF

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Publication number
CN1530999A
CN1530999A CNA2004100029792A CN200410002979A CN1530999A CN 1530999 A CN1530999 A CN 1530999A CN A2004100029792 A CNA2004100029792 A CN A2004100029792A CN 200410002979 A CN200410002979 A CN 200410002979A CN 1530999 A CN1530999 A CN 1530999A
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electrode
chromium
iron
nickel alloy
alloy according
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����ѫ
秋成勋
李英勋
权容杰
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Samsung SDI Co Ltd
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Samsung SDI Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/485—Construction of the gun or of parts thereof
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14708—Fe-Ni based alloys
    • H01F1/14716—Fe-Ni based alloys in the form of sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4803—Electrodes

Abstract

An electron gun includes a cathode, a control electrode, a screen electrode arranged in front of the control electrode, at least one focusing electrode arranged in front of the screen electrode to form a pre-focusing lens unit, a final accelerating electrode arranged in front of the focusing electrode(s) to form a main lens unit, and a shield cup electrically connected to the final accelerating electrode. The iron-chromium-nickel alloy for the focusing electrode(s), the final accelerating electrode, and the shield cup contains 18-20% or less by weight of chromium, 8-10% by weight of nickel, 0.03% or less by weight of carbon, 1.00% by weight of silicon, 2.00% or less by weight of manganese, 0.04% or less by weight of phosphorous, 0.03% or less by weight of sulfur, a balance of iron, and a trace of impurities, and has an average granularity of 0.010-0.022 mm.

Description

Iron-the chromium-nickel alloy that is used for electron gun electrodes
Priority request
The application has quoted the be entitled as iron-chromium-nickel alloy that be used for electron gun electrodes of on March 13rd, 2003 in the proposition of Korea S Department of Intellectual Property, and sequence number is the application of 2003-15690.Simultaneously, the application requires the rights and interests according to the above application of 35U.S.C. ξ 119.
Technical field
The present invention relates to a kind of electron gun, more particularly relate to a kind of iron-chromium-nickel alloy that is used for electron gun electrodes, it has effective punching performance and punching press formability and improved non magnetic characteristic, so that the focusing of electron gun and drift of convergence performance are unlikely to worsen.
Background technology
Usually in cathode ray tube, when electron gun is loaded a predetermined power, by the electron gun divergent bundle that is installed in the shell neck.The deflecting coil that electrons emitted Shu Jing is installed on the shell tapering part produces deflection, excites the fluorescent material that is used for imaging that is coated on the display screen panel inner surface simultaneously.For reducing the aberration part of display screen, this cathode ray tube is used different methods of attachment.
Electron gun comprises a triode unit, and this triode unit comprises the negative electrode of an emitting electrons, a control electrode and a screen electrode.Arrange one group of focusing electrode continuously in screen electrode front, the final accelerating electrode 28 of a formation main lens unit is installed towards last focusing electrode.
Most of electrode that forms electron gun triode unit is made by the Ni-based superalloy with less thermal coefficient of expansion.In addition, particularly be processed into dull and stereotyped control electrode and also require good punching performance with the screen electrode.
Other electrode except that control electrode and screen electrode, the electrode that particularly forms the main lens unit is shaped as cup-shaped.Therefore, but the material that is used for these electrodes should be deep draw is shaped.This cup-shaped electrode should keep non magnetic characteristic to cause the focusing of electron gun and drift of convergence performance to worsen to prevent because magnetic deflection field is out of shape.In addition, kind electrode should have better heat resistance and corrosion resistance and lower gas emission characteristic, so that be unlikely to influence the vacuum state of cathode tube.
Common electrode material is the unoxidizable alloy steel.Existing unoxidizable alloy steel contains the nickel (Ni) and 0.05% or the carbon (C) of less amount of chromium (Cr), the 13.5-15.5% of iron (Fe), 15-70%, and above percentage composition is weight percentage.Yet this unoxidizable alloy steel requires to use in a large number than noble metal nickel, and the weight percentage scope is 13-16%, so that it can be shaped and have non magnetic characteristic in the deep draw process.
Therefore, need a kind of new material that contains more a spot of nickel that is used for electron gun electrodes of development, make new material in pressing process, have good punching performance and formability simultaneously to reduce cost.
Summary of the invention
The invention provides a kind of iron-chromium-nickel alloy that is used for electron gun electrodes, can be in a proper range its composition be adjusted so that desired punching performance to be provided, and after heat treatment, keep non magnetic be used for improving focus on and the drift of convergence performance.
According to an aspect of the present invention, a kind of iron-chromium-nickel alloy that is used for electron gun electrodes is provided, and its electron gun comprises that a negative electrode, control electrode, one are arranged in the screen electrode of control electrode front, at least one is arranged in screen electrode front and is arranged in the shielding cup that the focusing electrode front is electrically connected with final accelerating electrode with the final accelerating electrode that forms the main lens unit and with the focusing electrode that forms the prefocus lens unit, one.Iron-the chromium-nickel alloy that is used for focusing electrode, final accelerating electrode and shielding cup contains the nickel, 0.03% or the carbon of less amount, 1.00% or the silicon of less amount, 2.00% or the manganese of less amount, 0.04% or the phosphorus of less amount, 0.03% or sulphur, balance iron and the trace impurity of less amount of the chromium of 18-20%, 8-10%, and above-mentioned percentage composition is weight percentage.Its particle mean size is the 0.010-0.022 millimeter.
The present invention also provides a kind of iron-chromium-nickel alloy that is used for electron gun electrodes, and its electron gun comprises that a negative electrode, control electrode, one are arranged in the screen electrode of control electrode front, at least one is arranged in screen electrode front and is arranged in the shielding cup that the focusing electrode front is electrically connected with final accelerating electrode with the final accelerating electrode that forms the main lens unit and with the focusing electrode that forms the prefocus lens unit, one.It is characterized in that iron-chromium-nickel alloy contains the nickel, 0.03% or the carbon of less amount, 1.00% or the silicon of less amount, 2.00% or the manganese of less amount, 0.04% or the phosphorus of less amount, 0.03% or sulphur, balance iron and the trace impurity of less amount of chromium, the 8-10% of 18-20%.Above percentage composition is weight percentage.Iron-chromium-nickel alloy is annealed under 1000 ℃ or higher temperature conditions and is reverted to initial non magnetic austenitic structure with the ferromagnetism martensitic structure that cold working is formed.
Description of drawings
With reference to following detailed description and complete understanding the present invention and some other advantage better in conjunction with the accompanying drawings, identical or close parts make and are denoted by like references, wherein:
Fig. 1 is the sectional arrangement drawing of a conventional cathode ray tube (CRT);
Fig. 2 is the decomposition diagram of Fig. 1 electron gun;
Fig. 3 is the sectional view of main lens unit among Fig. 2;
Fig. 4 is the magnetic permeability of electrode material of different amount nickel content and the graph of a relation of cold working rate;
Fig. 5 is the graph of a relation according to the tensile strength and the particle mean size of electrode material of the present invention;
Fig. 6 is the graph of a relation according to the yield strength and the particle mean size of electrode material of the present invention;
Fig. 7 is according to the elongation of electrode material of the present invention and the graph of a relation of particle mean size; And
Fig. 8 is according to the plastic strain rate of electrode material of the present invention and the graph of a relation of particle mean size.
Embodiment
With reference to figure 1, cathode ray tube 10 comprises the panel 11 that has the fluorescence coating (not shown) on its inner surface, 12, one of funnel that is used to form a shell that are assembled to panel 11 has many electron beam holes and separates shadow mask 13 and a shadow mask frame 14 that is used for fixing shadow mask 13 of a preset distance with panel 11 inner surfaces.
Use the position of stud pin 15 and linearity (Hookspring) the spring 16 fixed panels 11 inboard shadow mask frame 14 of elastic bearing on stud pin 15.
An electron gun 20 that can scan redness, green and blue beam on the fluorescence coating on panel 11 inner surfaces is set in the neck 12a of funnel 12.A shielding cup 17 is installed in electron gun 20 fronts.A deflecting coil 18 that is used for the electron beam deflecting is installed on the tapering part 12b of funnel 12.
As shown in Figure 2, electron gun 20 comprises a plurality of negative electrodes 21 as thermionic emitter, a control electrode 22 that is arranged in negative electrode 21 fronts, 23, one groups of focusing electrode 24-27 and the final accelerating electrodes 28 installed towards last focusing electrode 27 that are installed in screen electrode 23 fronts of screen electrode that are arranged in control electrode 22 fronts.
Three are used for emission redness, green and blue thermionic negative electrode 21 and are arranged point-blank.Control electrode 22 uses the electronics emission and the control electrode 22 of external signal control cathode 21 to have independent electron beam aperture.Screen electrode 23 also has independent electron beam aperture, so that with forming one prefocus lens unit towards first focusing electrode 24 of screen electrode 23.
Focusing electrode 24-27 arranges continuously in screen electrode 23 fronts, forms an electron lens unit with screen electrode 23, is used for focusing on and accelerated electron beam.
The quantity of focusing electrode 24-27 is not limited to the above.The quantity that can increase focusing electrode 24-27 is to form multistep focused electron lens.Each focusing electrode all has three in-line arrangement electron beam holes among the focusing electrode 24-27, thereby electron beam can be from here by exciting redness, green and the blue colour fluorescent powder that is coated on panel 11 inner surfaces.Can change the shape of electron beam hole according to the electron lens size that forms by focusing electrode 24-27.The another kind of selection is can form bigger single electron beam hole in each focusing electrode of focusing electrode 24-27.
In electron gun 20 with above structure, each electrode among the electrode 22-28 is applied a predetermined voltage be used for focusing on and quickening from negative electrode 21 electrons emitted, negative electrode 21 is as thermionic emitter, and electronics passes through electron beam hole.By the potential difference between negative electrode 21 and control electrode 22 thermion of being launched by negative electrode 21 is controlled.Electron beam is accelerated by screen electrode 23 time, and is focused on the fluorescence coating to form image by focusing electrode 24-27 and final accelerating electrode 28.
Control electrode 22 and screen electrode 23 are flat shape, and other electrode 24-28 is cup-shaped.In these electrodes, form the focusing electrode 27 of main lens unit and final accelerating electrode 28 be shaped or strike out cup-shaped, as shown in Figure 3.Use puncher be shaped electron beam hole 27a and 28a at this, chimb 27b and 28b are shaped respectively on the electron beam incident of focusing electrode 27 and final accelerating electrode 28 and exit surface.
According to feature of the present invention, remove the control electrode 22 and screen electrode 23 and the shielding cup 17 (referring to Fig. 1) that are installed in electron gun 20 fronts, compare with the conditional electronic rifle, electrode 24-28 contains than minor amount of nickel, and is made by the austenitic iron-chromium with specific particle mean size and surface roughness-nickel (Fe-Cr-Ni) stainless steel.
Particularly, austenitic iron-chromium-nickel alloy is used to electron gun electrodes in the present invention.Austenitic iron-chromium-nickel alloy contains the nickel, 0.03% or the carbon (C) of less amount, 1.00% or the silicon (Si) of less amount, 2.00% or the manganese (Mn) of less amount, 0.04% or the phosphorus (P) of less amount, 0.03% or sulphur (S), balance iron and the trace impurity of less amount of chromium, the 8-10% of 18-20%, and above-mentioned percentage composition is weight percentage.
The source alloy that will have above-mentioned composition is made the material that is used for electron gun electrodes, and method is as follows: the source alloy is carried out cold rolling for the first time, annealing, pickling, secondary skin-pass and ungrease treatment.Then, the source alloy that obtains is carried out following processing: bright annealing, tensioning homogenizing and the rip cutting that is used to twine.
Electron gun electrodes material particle mean size for the 0.01-0.02 millimeter so that effective punching performance, dimensional accuracy and good product appearance to be provided.
For focusing and the convergence performance that prevents electron gun worsens, the austenitic structure that has paramagnetic according to electron gun electrodes material of the present invention is to guarantee the non-magnetic material of material.This little tissue can be obtained by above-mentioned austenitic iron-chromium-nickel alloy, this austenitic iron-chromium-nickel alloy contains the nickel, 0.03% or the carbon of less amount, 1.00% or the silicon of less amount, 2.00% or the manganese of less amount, 0.04% or the phosphorus of less amount, 0.03% or sulphur, balance iron and the trace impurity of less amount of chromium, the 8-10% of 18-20%, and above-mentioned percentage composition is weight percentage.
When stating electrode material in the use and producing electrode, under 1000 ℃ or higher temperature conditions, anneal will revert to initial non magnetic austenitic structure by the ferromagnetism martensitic structure that cold working forms.
When rolling ratio or the increase of cold working percentage, can have magnetic according to electrode material of the present invention.Yet after 1050 ℃ of annealing in process, the magnetic of electrode material disappears, and non-magnetic material initial before cold rolling is recovered.
Has non magnetic austenitic structure at first according to electrode material of the present invention.When being cold worked into the ferromagnetism martensitic microstructure according to improved martensite transfor mation mechanism, non magnetic austenitic microstructure changes.Yet, can regain initial non magnetic austenitic microstructure by heat treatment.
The nickel that preferably contains the 8-10% weight percentage in the electrode material.If nickel content is less than 8% weight percentage, ferromagnetic structure can not be transformed into the nonferromagnetic structure fully after heat treatment.And nickel content is greater than 10% weight percentage, and then cost is too high and uneconomical.
The surface roughness affect of electrode material coefficient of friction and the punching performance with puncher and punch die.In addition, surface roughness is relevant with the outward appearance of surface gas emission characteristic and final products.The required outward appearance of final products and formability require suitable surface roughness.For realizing this goal, the external coating of electrode material is handled so that it has specific roughness.
In the present invention, use uneven roller, rather than it is coarse to use abrasive material in the usual method that the surface of electrode material is done, and makes uneven picture on surface transfer on the surface of electrode material.Preferred uneven picture on surface is a kind of discontinuous dot chart shape, rather than the continuous linearity pattern parallel with rolling direction, can reduce the anisotropy of electrode material like this.
Arithmetic average roughness (Ra) according to electrode material of the present invention is the 0.05-0.2 micron, and maximal roughness (Rmax) is the 1.5-2.0 micron.The following formula that use is obtained by the roughness curve that is defined as y=f (x) calculates arithmetic average roughness (Ra), unit is a micron, wherein, the X-axis of roughness curve represents to have the bearing of trend of an average line of drawing of reference length, and Y-axis is represented the perpendicular direction of bearing of trend with the average line of drawing:
Ra = 1 L ∫ 0 L | y ( x ) | dx
If the surface roughness of electrode material exceeds above scope, lubrication is not enough and produce heavy wear.As mentioned above, preferred a kind of discontinuous dot chart shape, rather than continuous linearity pattern is to reduce the anisotropy of electrode material.
Dimensional accuracy and hardness and improved punching performance for electron gun electrodes, when focusing electrode 27 or final accelerating electrode 28 have bigger single electron beam hole, highly be that 7 millimeters or height bigger and shielding cup 17 are 7 millimeters or when bigger, the Vickers hardness that is used for the electrode material of focusing electrode 27, final accelerating electrode 28 and shielding cup 17 is preferably 165-180Hv.Yet, when focusing electrode 17 or final accelerating electrode 28 have independently electron beam aperture, highly be 7 millimeters or more hour, be used for focusing electrode 17 and finally the Vickers hardness of the electrode material of accelerating electrode 28 be preferably 160-175Hv.When focusing electrode 17 or final accelerating electrode 28 comprise an internal electrode, highly be 7 millimeters or littler, and the height of shielding cup is 7 millimeters or more hour, the Vickers hardness that is used for the electrode material of focusing electrode 17, final accelerating electrode 28 and shielding cup is preferably 160-175Hv.
Below, with reference to following experiment embodiment the character according to electrode material of the present invention is elaborated.
Table 1 has been listed the composition of traditional electrode material (comparative example) and according to composition and the particle mean size thereof of electrode material of the present invention (example 1-6).
Table 1
Example Carbon Silicon Manganese Phosphorus Sulphur Nickel Chromium Iron Particle mean size, millimeter
Comparative example ?0.04 ?0.68 ?1.61 ?0.021 ?0.002 ?14.12 ?16.13 Surplus 0.019
Example 1 ?0.02 ?0.62 ?1.21 ?0.025 ?0.003 ?9.48 ?18.55 Surplus 0.030
Example 2 ?0.02 ?0.62 ?1.21 ?0.025 ?0.003 ?9.48 ?18.55 Surplus 0.025
Example 3 ?0.02 ?0.62 ?1.21 ?0.025 ?0.003 ?9.48 ?18.55 Surplus 0.019
Example 4 ?0.02 ?0.62 ?1.21 ?0.025 ?0.003 ?9.48 ?18.55 Surplus 0.013
Example 5 ?0.02 ?0.62 ?1.21 ?0.025 ?0.003 ?9.48 ?18.55 Surplus 0.008
Example 6 ?0.02 ?0.62 ?1.21 ?0.025 ?0.003 ?9.48 ?18.55 Surplus 0.002
In table 1, the composition of electrode material is represented with weight percentage.The traditional electrode material is iron-16% chromium-14% a nickel unoxidizable alloy steel, and the described electrode material of example 1-6 is the austenite stainless steel alloy according to the present invention, and its composition changes in a preset range.
With reference to table 1, the nickel that contains 14.12% weight percentage with the traditional electrode material is compared, and only contains the nickel of 9.48% weight percentage according to electrode material of the present invention.In addition, the carbon that contains 0.04% weight percentage with the traditional electrode material is compared, only contain the carbon of 0.02% weight percentage according to electrode material of the present invention, separate out at the crystal boundary place, improved the corrosion resistance and the fragility of electrode material thus thereby suppress carbon.
The term particle mean size is meant the average-size of the austenite crystal that splits along each crystal boundary in the unoxidizable alloy steel microscopic structure.
To measuring according to the character with different electrode materials of forming of the present invention.Measurement result is as follows.
Fig. 4 is the magnetic permeability of electrode material of different amount nickel content and the graph of a relation of cold working rate.
As shown in Figure 4, with contain 12% weight percentage nickel (curve A) and compare with the electrode material that contains 9.5% weight percentage nickel (curve B), along with the increase of cold working rate, the magnetic permeability (curve C) that contains the electrode material of 8.0% weight percentage nickel more approaches linear the increase.
Particularly for the electrode material that contains 8% weight percentage nickel, magnetic permeability sharply increases with the increase of cold working rate.What magnetic permeability was represented is the complexity of the magnetic line of force by electrode material.Unless reach magnetic saturation, otherwise the magnetic line of force can not pass through ferrimagnet.Simultaneously, the magnetic line of force can pass through nonmagnetic substance at an easy rate.Magnetic permeability in a vacuum equals 1.Magnetic permeability is preferably near 1, so that can not influence magnetic deflection field and can not worsen the focusing performance of electron gun.
Fig. 5-the 7th is according to tensile strength, yield strength and the elongation of electrode material of the present invention and the regression curve graph of a relation of particle mean size.Shown in Fig. 5-7, with the increase of particle mean size, the tensile strength of electrode material and yield strength are linearity and reduce, but elongation increases.
Use the plastic strain rate that the formability according to electrode material of the present invention is evaluated.The R value that is proposed by Lankford is by following formulate:
R = ϵ w ϵ t = ln ( W f / W 0 ) ln ( t f / t 0 ) = ln ( W f / W 0 ) ln ( W 0 l 0 / W f l f )
ε wherein wAnd ε tBe illustrated respectively in the strain on width and the thickness direction; W fAnd W 0Be illustrated respectively in before the strain and the width of strain rear electrode material; t fAnd t 0Be illustrated respectively in before the strain and the thickness of strain rear electrode material; W 0l 0Be illustrated in tension test and carry out preceding distance on width and depth direction; W fl fBe illustrated in and reach the distance on width and depth direction after 18% the extension.
Plastic strain rate, R value are the factors of determining that necking phenomenon begins, and necking phenomenon is because the unstable plasticity that electrode material exists in the course of processing causes, and promptly the electrode material part attenuates and produces.The R value is big more to be meaned because resistance is less, easier generation strain on width and rolling direction, but be easier on the bigger thickness direction of strain resistance, produce necking phenomenon.Therefore, the R value is big more, and punching performance is good more.
Has austenitic structure according to electrode material of the present invention.Similar to steel alloy with austenitic structure, can use following multiple regression equation formula to calculate the R value of steel alloy with face-centred cubic structure (FCC):
R＝1.165-6.86×10 -3(TS/YS)-1.111n+5.928×10 -3EL
Wherein TS represents tensile strength, and unit is Mpa; YS represents yield strength, and unit is Mpa; N represents strain hardening exponent; And EL represents to extend percentage.
In example of the present invention, the strain hardening exponent n of electrode material is about 0.5.Can use top multiple regression equation formula to calculate with respect to the R value that particle mean size changes.The result as shown in Figure 8.Listed the result of Fig. 5-8 in the table 2.
Table 2
Particle mean size, millimeter Tensile strength (TS), Mpa Yield strength (YS), MPa Elongation (EL), % The R value Dimensional accuracy The chimb shape
??0.033 ??593.7 ??238.0 ??64.3 ??0.97 ????△ ????×
??0.030 ??594.9 ??237.2 ??62.5 ??0.96 ????△ ????×
??0.028 ??598.7 ??239.0 ??60.7 ??0.95 ????△ ????△
??0.025 ??605.2 ??243.5 ??59.1 ??0.94 ????△ ????△
??0.022 ??614.4 ??250.8 ??57.5 ??0.93 ????○ ????○
??0.019 ??626.2 ??260.7 ??56.0 ??0.93 ????○ ????○
??0.016 ??640.8 ??273.3 ??54.6 ??0.92 ????○ ????○
??0.013 ??658.0 ??288.6 ??53.3 ??0.91 ????○ ????○
??0.010 ??677.9 ??306.6 ??52.1 ??0.90 ????○ ????○
??0.008 ??700.4 ??327.3 ??50.9 ??0.90 ????△ ????○
??0.005 ??725.7 ??350.7 ??49.9 ??0.89 ????△ ????○
??0.002 ??753.6 ??376.8 ??48.9 ??0.89 ????△ ????○
With reference to figure 8 and table 2, increase with particle mean size, the plastic strain rate, the R value also increases.Yet, dimensional accuracy and chimb shape after forming according to electrode, particle mean size is preferably in the 0.010-0.022 millimeter scope.
As mentioned above, the iron-chromium-nickel alloy steel that is used for according to electron gun electrodes of the present invention is to obtain specific particle mean size and surface roughness, can adjust its composition in a preset range.Steel alloy has following effect.
Compare with the conventional alloys steel, the iron-chromium-nickel alloy steel that is used for electron gun electrodes contains less than noble metal nickel, thereby greatly reduces the production cost of electron gun.In addition, have effective punching performance and punching press formability by the electron gun electrodes that iron-the chromium-nickel alloy steel is made.Iron-chromium-nickel alloy steel is non magnetic, can prevent that the focusing of electron gun and drift of convergence performance from worsening.Therefore, iron-chromium-nickel alloy steel can be used for producing cathode ray tube more reliably.
Though the present invention is specified and describes in detail according to exemplary embodiments, should understand like this, promptly those of ordinary skills can carry out various changes to some forms and details under the prerequisite that does not depart from the purport of the present invention that limited by following claim and scope.

Claims (20)

1, a kind of iron-chromium-nickel alloy that is used for electron gun electrodes, its electron gun comprise that a negative electrode, control electrode, one are arranged in the screen electrode of described control electrode front, at least one is arranged in described screen electrode front and is arranged in described at least one focusing electrode front to form final accelerating electrode and a shielding cup that is electrically connected with described final accelerating electrode of main lens unit with the focusing electrode that forms the prefocus lens unit, one; Described iron-the chromium-nickel alloy that is used for described at least one focusing electrode, described final accelerating electrode and described shielding cup contain the chromium of 18-20%, 8-10% nickel, be no more than 0.03% carbon, be no more than 1.00% silicon, be no more than 2.00% manganese, be no more than 0.04% phosphorus, be no more than 0.03% sulphur, balance iron and trace impurity, above-mentioned percentage composition is weight percentage.
2, iron-chromium-nickel alloy according to claim 1, its surface roughness Ra scope is the 0.05-0.2 micron, maximal roughness Rmax scope is the 1.5-2.0 micron.
3, iron-chromium-nickel alloy according to claim 2 is characterized in that, surface roughness comes from the picture on surface of the described iron-chromium-nickel alloy that uses uneven roller shaping.
4, iron-chromium-nickel alloy according to claim 3 is characterized in that, picture on surface is a kind of discontinuous dot chart shape that is parallel to rolling direction, is used to make iron-chromium-nickel alloy to have less anisotropy.
5, iron-chromium-nickel alloy according to claim 1 is characterized in that, one of described at least one focusing electrode and described final accelerating electrode have bigger single electron beam hole and highly be 7 millimeters.
6, iron-chromium-nickel alloy according to claim 5, when described at least one focusing electrode that is used to have bigger single electron beam hole and described final accelerating electrode, its Vickers hardness scope is 165-180Hv.
7, iron-chromium-nickel alloy according to claim 1 is characterized in that, the height of described shielding cup is at least 7 millimeters.
8, iron-chromium-nickel alloy according to claim 7, when being used for described shielding cup, its Vickers hardness scope is 165-180Hv.
9, iron-chromium-nickel alloy according to claim 1 is characterized in that, one of described at least one focusing electrode and described final accelerating electrode have independently electron beam aperture and it highly is no more than 7 millimeters.
10, iron-chromium-nickel alloy according to claim 9, when described at least one focusing electrode that is used to have electron beam aperture independently and described final accelerating electrode, its Vickers hardness scope is 160-175Hv.
11, iron-chromium-nickel alloy according to claim 1 is characterized in that, one of described at least one focusing electrode and described final accelerating electrode comprise that an internal electrode and its highly are no more than 7 millimeters.
12, iron-chromium-nickel alloy according to claim 11, when being used for described at least one focusing electrode and described final accelerating electrode, its Vickers hardness scope is 160-175Hv.
13, iron-chromium-nickel alloy according to claim 1, its mean particle size range are the 0.010-0.022 millimeter.
14, iron-chromium-nickel alloy according to claim 1 is characterized in that, the material that described alloy is machined for the described electrode of described electron gun will be through in cold rolling, annealing for the first time, pickling, secondary skin-pass and the ungrease treatment at least one.
15, iron-chromium-nickel alloy according to claim 1 is characterized in that, will carry out bright annealing, tensioning homogenizing and at least one of the rip cutting that is used for twining to described alloy.
16, a kind of iron-chromium-nickel alloy that is used for electron gun electrodes, its electron gun comprise that a negative electrode, control electrode, one are arranged in the screen electrode of described control electrode front, at least one is arranged in described screen electrode front and is arranged in described at least one focusing electrode front to form final accelerating electrode and a shielding cup that is electrically connected with described final accelerating electrode of main lens unit with the focusing electrode that forms the prefocus lens unit, one; Be used for described at least one focusing electrode, described iron-the chromium-nickel alloy of described final accelerating electrode and described shielding cup contains the chromium of 18-20%, the nickel of 8-10%, be no more than 0.03% carbon, be no more than 1.00% silicon, be no more than 2.00% manganese, be no more than 0.04% phosphorus, be no more than 0.03% sulphur, balance iron and trace impurity, above-mentioned percentage composition is weight percentage, wherein, described iron-chromium-nickel alloy stands under 1000 ℃ of conditions to anneal will be reverted to initial non magnetic austenitic structure by the ferromagnetism martensitic structure that cold working forms being not less than.
17, iron-chromium-nickel alloy according to claim 16, when being used for described at least one focusing electrode, described final accelerating electrode and described shielding cup, its mean particle size range is the 0.010-0.022 millimeter.
18, iron-chromium-nickel alloy according to claim 16, its surface roughness Ra scope is the 0.05-0.2 micron, maximal roughness Rmax scope is the 1.5-2.0 micron.
19, iron-chromium-nickel alloy according to claim 16 is characterized in that, the material that described alloy is machined for the described electrode of described electron gun will be through in cold rolling, annealing for the first time, pickling, secondary skin-pass and the ungrease treatment at least one.
20, iron-chromium-nickel alloy according to claim 16 is characterized in that, will carry out bright annealing, tensioning homogenizing and at least one of the rip cutting that is used for twining to described alloy.
CNA2004100029792A 2003-03-13 2004-01-21 Fe-Cr-Ni alloy as electron gun electrodes Pending CN1530999A (en)

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CN112017928A (en) * 2020-09-02 2020-12-01 四川天微电子股份有限公司 Manufacturing process of short tube CRT display tube

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US5506468A (en) * 1993-06-24 1996-04-09 Goldstar Co., Ltd. Electron gun for color cathode-ray tube
JP3924397B2 (en) * 1999-07-05 2007-06-06 日鉱金属株式会社 Fe-Cr-Ni alloy material for electron gun electrode

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112017928A (en) * 2020-09-02 2020-12-01 四川天微电子股份有限公司 Manufacturing process of short tube CRT display tube

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