JPH06215619A - CRT lead wire - Google Patents

Abstract

(57) [Summary] [Purpose] When sealing the lead-in wire to the stem of a CRT, uniform bubbles can be formed in the glass, and moreover, a uniform oxide film is formed by being uniformly oxidized by the heating of city gas. To provide outer leads and inner leads. [Structure] C, Si, Mn, Cu, Fe, Cr, Mg,
Ni wire containing Al, Ti, P, S, of which C
u + Fe + Cr + Mg + Al + Ti + P + S is 0.08
~ 0.6 wt%, C 0.02-0.08 wt%, Si
Is 0.05 to 0.20 wt% and Mn is 0.10 to 0.3
It is 0% by weight. By controlling the trace components in the Ni alloy, it is possible to prevent embrittlement due to the heating of the city gas and to generate uniform bubbles in the glass.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead wire used in a terminal portion of a CRT (Cathorde Ray Tube) such as a television CRT.

[0002]

2. Description of the Related Art Electron tube electrode connection materials play an important role in electrically extracting the action of electrodes operating in a vacuum into the atmosphere. For example, as shown in FIG. For this, an introduction line is used that passes through while maintaining the airtightness of the glass container. Generally, the lead wire is formed by welding the inner lead 1 located inside the CRT and the outer lead 3 located outside the same with the Dumet wire 2 that is hermetically sealed with glass as the center. And Ni alloy.

The characteristics required for such a lead wire are as follows. Easy to weld with Dumet wire. When the glass is sealed, as shown in FIG. 3, bubbles 9 serving as a cushion for external pressure should be formed in the glass near the joint with the Dumet wire. Embrittlement due to city gas (methane gas, etc.) does not occur during CRT production or transportation.

Conventionally, in the lead wire, N of the component shown in Table 5 is used.
Although i or Ni alloy is generally used and substantially satisfies the above-mentioned required characteristics, the following problems have been highlighted in recent years, especially with the spread of large color televisions.

[0005]

[Table 5]

[0006]

Air bubbles are evenly distributed so that the outer leads form a sufficient cushion even when they are subjected to external pressure. In particular, since the CRT for color has a large number of pins, it is required that small air bubbles are uniformly dispersed, and for the black and white CRT, large air bubbles are required to be evenly dispersed. In the past, it was enough that there were merely bubbles in the glass that served as cushions, but especially for color CRTs.
This is because the response to is no longer sufficient. Since the inner leads are exposed to high temperature during the glass sealing and CRT movement, the inner leads should form an oxide film uniformly. Conventionally, the oxide film is partially thickened due to non-uniformity of the components, peels off during the movement of the CRT, and scatters on the front of the CRT.
This is because it caused flicker on the screen.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to form uniform bubbles in the glass when sealing the stem of the CRT and to heat the city gas. On the other hand, it is to provide an outer lead and an inner lead that are uniformly oxidized to form a dense oxide film.

[0008]

As a result of various investigations, the present inventor has found that the above object can be achieved by controlling the trace components or gas contents in Ni or Ni alloys. . Its characteristics are C, Si, Mn, Cu, Fe,
Ni wire containing Cr, Mg, Al, Ti, P and S, of which Cu + Fe + Cr + Mg + Al + Ti + P
+ S is 0.08 to 0.6% by weight, C is 0.02 to 0.0
8 weight%, 0.05 to 0.20 weight% of Si, and 0.10 to 0.30 weight% of Mn. This lead wire is particularly suitable for a color CRT.

As lead wires suitable for black and white CRTs, C, Si, Mn, Cu, Fe, Cr, Mg, Al,
Ni wire containing Ti, P, S, Cu + Fe + Cr
+ Mg + Al + Ti + P + S 0.08-0.6% by weight
C is 0.08 to 0.15% by weight, and Si is 0.05 to
0.20% by weight, and Mn is 0.10 to 0.30% by weight.

In each of the above lead wires, Cu: 0.0
01-0.10, Fe: 0.01-0.20, Cr:
0.01-0.10, Mg: 0.005-0.05, A
1: 0.005-0.05, Ti: 0.01-0.0
5, P: 0.01 or less, S: 0.01 or less (all are% by weight).

Further, particularly suitable for the inner lead are C, Si, Mn, Cu, Fe, Cr, Mg,
Ni wire containing Al, Ti, P, S, Cu + Fe
+ Cr + Mg + Al + Ti + P + S is 0.08-0.6
% By weight, 0.01 to 0.15% by weight of C and 0.
It is characterized in that it is 05 to 0.20% by weight and Mn is 1.5 to 3.5% by weight.

Here, Cu: 0.001 to 0.10, F
e: 0.01 to 0.20, Cr: 0.01 to 0.10.
Mg: 0.005 to 0.05, Al: 0.005 to 0.
01, Ti: 0.01 to 0.05, P: 0.01 or less,
It is preferable that S: 0.01 or less (all are wt%).

In each of the lead wires described above,
Oxygen: 15 PPM or less, Nitrogen: 15 PPM or less, Hydrogen:
It is preferably 10 PPM or less.

[0014]

(1) Ni wire CRT for outer lead There are black and white and color ones for the CRT. Regarding foaming in the glass of the stem, large foaming for black and white and small foaming for color are desirable. First, in the case of a color product, if the C content is 0.02 to 0.08% by weight,
It was known that the foaming property was most effective, but in order to make this foaming uniform, it is important to control the trace elements within a certain range, and the above limitation was made from this viewpoint. .

Among the trace elements, Cu, Fe, C
r, Mg, Al, and Ti contribute to stabilizing the foaming in the glass and densifying the oxide film. Of these, Mg,
Al and Ti are important for stabilizing oxygen and nitrogen, and M
g and Al are 0.005 to 0.05% by weight, and Ti is 0.
It is important to set it to 01 to 0.05% by weight. If it is less than this range, the effect of stabilizing oxygen and nitrogen is insufficient, and if it exceeds this range, the hardness becomes high and the workability becomes low, or the oxide film becomes thicker.

Further, Si and Mn are important for heat resistance and prevention of embrittlement due to city gas. When the amount is less than the above limit, such an effect becomes insufficient, and conversely, when the amount exceeds the above limit, the hardness becomes high, and the glass is hard to bend. It may crack.

Cu, Fe, Cr, Mg, Al,
The total amount of P and S in addition to Ti may be 0.08 to 0.6% by weight. If it exceeds 0.6%, and particularly if it exceeds 1.0%, problems of hardness and oxide film occur.

Next, in the case of black and white, the content of C is set to 0.
It is important to set it to 08 to 0.15% by weight. Other trace elements are controlled as in the case of the above-mentioned color.
If it exceeds 0.15%, and particularly if it exceeds 0.18%, the hardness becomes high and glass cracking may occur upon bending.

(2) Ni wire for inner lead In the case of the inner lead arranged inside the CRT, characteristics in high vacuum, uniform oxide film formation during glass sealing, and embrittlement due to city gas (due to internal oxidation) It is important to prevent the crystals from becoming brittle.

Here, the reason why Mn is set to 1.5 to 3.5% by weight is to prevent the embrittlement by city gas and to maintain the strength after heating, and when it is less than 1.5%, especially 1. If it is less than 0%, there is no effect in preventing embrittlement, and conversely, if it exceeds 3.5%, and especially if it is 4% or more, the hardness becomes too high and the workability in linear processing becomes problematic.

In addition, the inner lead is particularly important because it is directly connected to the CRT screen. In the past, a thick oxide film was partially formed by the city gas, which was peeled off during the CRT operation, resulting in screen flicker on the screen. There was an accident. Therefore, in order to make the oxide film dense and uniform, it is necessary to control the content of trace elements. What is important here is Cu, Fe, Cr, Mg, Al, and Ti. Particularly, if Mg, Al, or Ti is less than the above-mentioned range, it is not effective for forming a dense film, and conversely, if it exceeds the range, it becomes a brittle film. To become. Here, Al is 0.005-0.01
This is because it is not necessary to add more than necessary due to the effect of Mn.

Further, here, the amount of C is 0.01 to 0.15.
The weight% is set because the inner leads are required to foam to a certain extent in the glass, like the outer leads. If it is less than 0.01%, no foaming is observed and 0.1
If it exceeds 5%, there is a problem that the hardness becomes too high. The total amount of P and S in addition to Cu, Fe, Cr, Mg, Al and Ti may be 0.08 to 0.6% by weight. If it exceeds 0.6%, and particularly if it exceeds 1.0%, problems of hardness and oxide film occur.

(3) Gas Content The gas content of the outer and inner leads was limited in order to make the foaming uniform in the glass. If this limit is exceeded, the foaming will have an extremely nonuniform shape and size.

[0024]

EXAMPLES Examples of the present invention will be described below together with comparative examples. First, while melting the electrode Ni for melting in a high frequency induction melting furnace or a vacuum melting furnace having a capacity of 1 t, Si, Mn, and C are added to obtain predetermined components. At this time, Ti, Al, M
The addition time of g was set to the end, and the ingot was cast at the end so that the predetermined components were obtained. This ingot was hot-rolled as a billet after forging to obtain a wire rod having a diameter of about 6 mm. Then, after descaling this wire, cold drawing was repeated, and the Ni wire for outer lead was 1.0 mm.
The Ni wire for the inner lead was drawn to a diameter of 0.65 mm and softened. Among the obtained wire materials, the composition of the outer lead is shown in Table 1, the gas amount thereof is shown in Table 2, the composition of the inner lead is shown in Table 3, and the gas amount thereof is shown in Table 4. Table 1
Examples 1 to 6 are for color, and Examples 7 to 12 are for black and white.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

[Table 3]

[0028]

[Table 4]

Thereafter, as shown in FIG. 1, the outer lead 1 was cut into a length of 8 mm, the inner lead 3 was cut into a length of 16 mm, and a 0.35 mmφ Dumet wire 2 was welded at the center to produce a stem pin. Then, the stem pin was sealed with glass, and the degree of foaming in the glass and the state of the oxide film at that time were examined. The glass used is R ₂
O ・ BaO ・ SrO ・ SiO ₂ system color glass, and the composition of city gas is H ₂ : 47%, N ₂ : 16%, O ₂ :
4%, CO: 10%, CO 2: 6%, CH 4: to 11%, was sealed and heated to 700 to 900 ° C..

The test results are shown in Table 2 above for the outer leads and Table 4 for the inner leads. In each table, the foamability indicates the uniformity of foaming in the glass, ◯ indicates uniform, Δ indicates fluctuating, and x indicates comparable to conventional products. Also, the oxide film shows whether it is dense and uniform, ○ is dense and uniform and the color is uniform, △ is partially discolored, × is partially thick And that peeling is observed. Further, the hardness is indicated by x when the stem pin is too hard and has no straightness, Δ when soft and deformed by heating of flame, and ◯ when no problem occurs.

As shown in the above-mentioned tables, the foamability and the state of the oxide film were insufficient in all of the comparative examples, but all the examples were good, and the effectiveness of the present invention was confirmed. It was

[0032]

As described above, according to the lead wire of the present invention, it is possible to obtain a CRT that is free from embrittlement by city gas, peroxidation and glass cracks. Therefore, with the development of OA equipment, monitors, etc., it is expected to be available in many fields.

[Brief description of drawings]

FIG. 1 is a side view of a stem pin using a lead wire of the present invention.

FIG. 2 is a sectional view showing the outline of a CRT.

FIG. 3 is a partial cross-sectional view showing the outline of a CRT stem.

[Explanation of symbols] 1 inner lead 2 dumet wire 3 outer lead 4 stem 5 cathode 6 grid 7 deflection yoke 8 anode button 9 air bubble 10 tungsten wire

Claims (6)

[Claims] 1. C, Si, Mn, Cu, Fe, Cr, M
Ni wire containing g, Al, Ti, P and S, of which Cu + Fe + Cr + Mg + Al + Ti + P + S is 0.08 to 0.6% by weight, C is 0.02 to 0.08% by weight, and Si is 0.05 to 0. 20% by weight, Mn 0.10
A lead wire for a CRT, characterized in that the lead wire content is 0.30% by weight. 2. C, Si, Mn, Cu, Fe, Cr, M
Ni wire containing g, Al, Ti, P and S, wherein Cu
+ Fe + Cr + Mg + Al + Ti + P + S is 0.08 ~
0.6% by weight, C 0.08 to 0.15% by weight, Si
Is 0.05 to 0.20 wt% and Mn is 0.10 to 0.3
Lead wire for CRT characterized by being 0% by weight. 3. Cu: 0.001 to 0.10, Fe:
0.01-0.20, Cr: 0.01-0.10, M
g: 0.005-0.05, Al: 0.005-0.0
5, Ti: 0.01 to 0.05, P: 0.01 or less,
The lead wire for CRT according to claim 1 or 2, wherein S: 0.01 or less (all are wt%). 4. C, Si, Mn, Cu, Fe, Cr, M
Ni wire containing g, Al, Ti, P and S, wherein Cu
+ Fe + Cr + Mg + Al + Ti + P + S is 0.08 ~
0.6% by weight, 0.01 to 0.15% by weight of C, Si
Is 0.05 to 0.20% by weight, and Mn is 1.5 to 3.5% by weight. 5. Cu: 0.001 to 0.10, Fe:
0.01-0.20, Cr: 0.01-0.10, M
g: 0.005-0.05, Al: 0.005-0.0
1, Ti: 0.01 to 0.05, P: 0.01 or less,
The lead wire for CRT according to claim 4, wherein S: 0.01 or less (all are% by weight). 6. Oxygen: 15PPM or less, nitrogen: 15PP
M or less and hydrogen: 10 PPM or less, The lead wire for CRTs of Claim 1, 2, 3, 4 or 5.