JPS6142776B2 - - Google Patents

Description

[Detailed description of the invention]

This invention relates to a soft glass sealing alloy with high strength. 42Ni is generally used as an alloy for soft glass sealing.
6Cr-Fe alloy and 4.7Ni-5Cr-Fe alloy are widely used. Normally, these alloys are punched or etched into the desired shape, then treated with an oxide film in wet hydrogen and sealed with glass, and are used for things such as cathode ray tube anode buttons and digital display tube lead frames. . By the way, recently, digital display tubes have been used in automobiles, etc., but the above-mentioned sealing alloy of digital display tubes lacks strength in the punched or etched portions, and as a result, it is susceptible to vibrations while the automobile is running. Due to the problem of easy breakage and the desire to make alloy plates thinner in order to save resources, demand for sealing alloys with high hardness has increased. The purpose of the present invention is to develop an alloy that can meet such demands, and the inventor has developed an alloy that can meet such demands.
As a result of various experimental studies on alloying elements that increase the hardness of the necessary oxide coating treatment without changing the thermal expansion coefficient of the sealing alloy with 4 to 8 wt% Cr and Fe, we found that by adding specific amounts of Be and C to the above alloy. discovered that the hardness of conventional sealing alloys can be increased without deteriorating the coefficient of thermal expansion or the adhesive strength of the oxide film. The present invention is based on the above findings, and includes:
Ni4048wt%, Cr4~8wt%, Si0.10~0.40wt%,
Mn0.10~0.40wt%, Al0.05~0.40wt%
Contains C0.015wt% or less, Be0.05~0.50wt%,
The remainder consists of a strong soft glass sealing alloy consisting essentially of Fe. In the present invention, the reason why the component range is limited as described above will be explained below. If Ni is less than 40%, the coefficient of thermal expansion becomes too small, and the difference in coefficient of thermal expansion with soft glass becomes large, making glass sealing difficult. Moreover, if it exceeds 48%, the coefficient of thermal expansion becomes too large and the difference in coefficient of thermal expansion with soft glass becomes too large, which is not preferable. Furthermore, if Cr is less than 40%, the coefficient of thermal expansion will be too small, and the difference in coefficient of thermal expansion with soft glass will become too large, and the adhesion of the oxide film to the alloy base will be poor, and if it exceeds 8%, the coefficient of thermal expansion will become too large. If it is too large, the difference in coefficient of thermal expansion with soft glass will become too large, which is not preferable. If Si is less than 0.10%, the adhesion of the formed oxide film to the synthetic substrate is poor, and if it exceeds 0.40%, hot workability is deteriorated, which is not preferable. Mn is effective in improving hot workability by fixing S mixed in the raw material into MnS, but if it is less than 0.10%, the effect is small, and if it exceeds 0.40%, the effect is saturated. It is not necessary to contain more than that. Al is effective in improving the adhesion of the oxide film to the synthetic substrate, but if it is less than 0.05%, it has no effect, and if it is added in excess of 0.40%, it deteriorates hot workability, which is not preferable. Be, which is a feature of the present invention, is effective in increasing hardness. However, if it is less than 0.05%, the effect will be small, and if it exceeds 0.50%, hot workability will deteriorate. If C exceeds 0.015%, C reacts with O ₂ in the glass to generate CO gas during glass sealing, creating bubbles in the low melting point glass for sealing and reducing the glass sealing strength, so it is preferable. do not have. When C is 0.015% or less, there is no particular foaming and it is effective in improving the sealing strength. Furthermore, in the alloy of the present invention, by controlling O ₂ +N ₂ to 0.010% or less, it is effective in preventing the formation of glass bubbles during sealing and improving processability. The present invention will be explained below with reference to Examples. After hot rolling, the present invention alloy and comparative alloy whose components are listed in Table 1 are softened and annealed, and then the final processing rate is
80% cold rolled plate thickness 0.2mm x width 340mm x length
A sample for hardness measurement was taken from a 5.000 mm plate, and the Vikers hardness was measured. In addition, the thermal expansion characteristics are 3 mm
A 50 mm sample was taken and measured after heat treatment at 900°C for 30 minutes. The table shows the hardness and average coefficient of thermal expansion of each sample in each temperature range when rolled and after heat treatment at each temperature for 20 minutes.

【table】

[Table] As is clear from Table 1, the alloy of the present invention is the conventional sealing alloy 42Ni-6Cr-Fe alloy and 47Ni-5Cr-Fe alloy.
There is almost no difference in the coefficient of thermal expansion of the alloys, and the hardness is further improved. Therefore, the present invention can extend the life of the lead frame material of, for example, a digital display tube for automobiles, and can also reduce the thickness of the lead frame, thereby saving resources and costs.

Claims (1)

[Claims] 1 Ni40~48wt%, Cr4~8wt%, Si0.10~0.4wt
%, Mn0.10~0.40wt%, Al0.05~0.40wt%
Contains C0.015wt% or less, Be0.05~0.50wt%,
An alloy for soft glass sealing with great strength, characterized in that the remainder essentially consists of Fe.