JPH073400A - Fe-Ni alloy for electron gun electrode - Google Patents

Abstract

(57) [Abstract] [Purpose] Fe- for the electrode (grid) of the electron gun of CRT
(EN) Provided is a material which is an improved Ni alloy, has sufficient hardness, suppresses the occurrence of burrs during punching, and enables the production of an electrode that prevents a decrease in withstand voltage. [Composition] Ni: 32 to 50% (weight%, the same applies hereinafter), and 1 to 5% of one or more of Nb, Ta, W and Zr (two or more in total), Further, an alloy containing 0.003 to 0.02% of S and / or P, and the balance being substantially Fe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a Ni--Fe alloy for an electrode of an electron gun of a cathode ray tube of a CRT such as a color television.

[0002]

2. Description of the Related Art As is well known, a CRT electron gun has a plurality of electrodes (grids), each of which has a central hole for passing an electron beam. These electrodes need to be made of a non-magnetic material for forming an electrostatic lens, and conventionally, non-magnetic stainless steel (mainly SUS304) was used as the material.

However, a material such as SUS304 has a problem that burrs are apt to occur during punching.
If the electrodes have burrs, the withstand voltage is lowered and the performance of the electron gun is deteriorated, or the electron gun cannot be used.

The use of Fe-Ni alloys has also been investigated, and Nb, T is used for the purpose of preventing deformation caused by its low hardness.
containing one or more of a, Hf and Zr,
In particular, it has been proposed to make an electrode of an electron gun with a material present in the form of a compound of these and Fe. (JP-A-1-
(No. 204335) However, also in this alloy, the effect of preventing the generation of burrs during processing is poor, and the hot workability is also insufficient from the viewpoint of the shape and dimensional accuracy required for the electrode.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned points, to obtain a high hot workability, a small amount of burrs during punching, and a material for an electrode (grid) of an electron gun. It is to provide a suitable Fe-Ni based alloy.

[0006]

The Fe-Ni alloy for electron gun electrodes of the present invention having improved properties is Ni: 32.
~ 50% (wt%, same below), Nb, Ta,
When 1 or 2 or more of W and Zr are contained, 1 to 5% in total is contained, and further, S and / or
P: 0.003 to 0.02% is contained, and the balance is substantially F.
It consists of e.

In this alloy, the Ni content is 32-5.
Co corresponding to 0% to 5.0% can be replaced with Co.

[0008]

The reason why the composition of the Fe-Ni alloy is limited as described above in the present invention is as follows.

Ni: 32-50% (up to 5% Co
Can be replaced with ) In order to obtain the low thermal expansion characteristics of the Fe-Ni alloy,
The amount must be within the above range. As is well known, typical values are 38-42%.

Nb, Ta, W and Zr: 1 type or 2
In the case of 1 or more and 2 or more, the total is 1 to 5%. These components impart hardness to the alloy to make it difficult to deform and enhance hot workability. There are some functions that reduce burrs during punching. Although the effect of improving the hardness can be obtained even in a relatively small amount, addition of 1% or more is required to reduce the burr. On the other hand, addition of more than 5% is not preferable because it causes an excessive increase in hardness, and the effect of suppressing burrs is saturated.

The hardness (H) when these alloy components are added to the Fe-40Ni alloy in the range of 0.5 to 5%
Fig. 1 shows the change in v) and Fig. 2 shows the height of the burr during punching.
, Respectively.

S and / or P: 0.003-0.
02% Prevents the occurrence of burrs during punching. This effect is 0.0
Although it is recognized from the presence of a small amount of about 03%, 0.01%
The presence above is preferable. When the upper limit of 0.02% is reached, the effect is saturated, while the deterioration of hot workability is observed.

FIG. 3 shows the result of measuring the height of burrs in the case where S or P was added to the Fe-40Ni-3Nb alloy in the range of 0.001 to 0.02%.

[0014]

Example Each alloy having the composition shown in Table 1 was melted. No.
1 to 5 are examples of the present invention, and Nos. 11 to 17 are alloys prepared for comparison and having a composition outside the scope of the present invention.
After forging the ingot, it was hot-rolled at a heating temperature of 1100 ° C. to obtain a plate material having a thickness of 3 mm. The descaled product is cold-rolled to a thickness of 1.5 mm, 1000 ° C ×
Repeated 2 minutes continuous annealing followed by cold rolling,
Finally, a thin plate having a thickness of 0.3 mm was obtained.

The hardness (Hv) of each material was measured, and the clearance was 10%, the shear rate was S / t (S: punch rate,
t: plate thickness) punching under the condition of 200 / sec,
I investigated the height of Bali. The results are also shown in Table 1.

Table 1 No. Alloy composition (wt%, balance Fe) Hardness Burr height Ni Co Nb Ta W Zr P S (Hv) (mm) 1 39.50 − 3.02 − − − 0.008 0.010 263 0.024 2 37.88 2.46 2.93 − − − 0.002 0.019 258 0.022 3 40.08 0.35 − 2.98 − − 0.011 0.006 243 0.021 4 5 11 38.90 − 0.98 − − − 0.002 0.001 215 0.103 12 37.80 − 0.71 0.23 − − 0.001 0.001 213 0.112 13 39.50 − 0.88 − 0.09 − 0.008 0.002 224 0.083 14 40.10 − − − 0.81 0.16 0.002 0.011 226 0.078 15 36.20 2.90 2.83 − − − 0.001 0.001 261 0.048 16 29.11 − − 3.02 − − 0.001 0.002 251 0.061 17 40.08 3.53 − − 2.04 1.13 0.002 0.001 257 0.058

[0017]

INDUSTRIAL APPLICABILITY The alloy for an electron gun electrode of the present invention is a Fe-Ni alloy having a low coefficient of thermal expansion, has good hot workability, has sufficient hardness, and is free from burrs during punching. It succeeded in suppressing effectively. This alloy is useful as a material for electron gun grids,
It is possible to manufacture a grid in which there is no fear of a decrease in withstand voltage due to the occurrence of burrs.

[Brief description of drawings]

1 shows Fe-40Ni alloys with varying amounts of Nb, W,
The graph which shows Hv at the time of adding Ta and Zr.

2] Fe-40Ni alloys with various amounts of Nb, W,
The graph which shows the height of the burr generated by punching when Ta and Zr are added.

FIG. 3: Fe-40Ni-3Nb alloy with various amounts of S
A graph showing the height of burrs when P is added.

Claims (2)

[Claims] 1. In addition to Ni: 32 to 50% (weight%, the same applies hereinafter), 1 or 2 or more of Nb, Ta, W and Zr are added to a total of 1 to 5% in the case of 2 or more. Contains,
Further S and / or P: 0.003 to 0.02%
F for an electron gun electrode containing Al and the balance being substantially Fe
e-Ni alloy. 2. 5.0 out of 32 to 50% of Ni content
% Of Fe- of claim 1 in which a proportion corresponding to
Ni alloy.