JPS59166656A - Alloy for sealing glass - Google Patents

Abstract

PURPOSE:To provide an alloy for sealing glass improved in the close adhesiveness between an oxide film and a base alloy, obtained by prescribing S-content in an Fe-Ni-Cr type alloy having a specific compositional ratio. CONSTITUTION:An Fe-Ni-Cr type alloy for sealing glass comprises 5-7wt% of Cr, 40-50wt% of Ni and the remainder of Fe and the S-content thereof is adjusted to 0.05% or less. This alloy having the above mentioned composition is heated in a wet hydrogen atmosphere to form an oxide film and sealed with soft glass through said oxide film. By this alloy composition, the oxide film has a good affinity to glass and the glass is strongly sealed to the alloy base to form a seal part with high reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a FeNi-0r alloy for soft glass sealing used in glass sealing parts of fluorescent display tubes, TV cathode ray tubes, IHA vacuum tube type solar collectors, and the like.

Conventionally, Ire-42%Ni was used for sealing with soft glass.
-6%Or or Fe-47%N1-5%Or is widely used.

The general method for this yuzu alloy is to form an oxide film with good wettability with glass on the alloy surface in advance before glass sealing, and then seal the glass and alloy through this oxide film. It is being The most important factor in obtaining highly reliable sealing is that this oxide film is compatible with the glass and is strongly adhered to the alloy base.

However, the oxide film produced by conventional Fe-Ni-Or gold alloys does not have sufficient poaching strength with the alloy base, and the oxide film peels off from the alloy base due to thermal stress after glass sealing, resulting in slow leakage or glass failure. There were times when this could lead to accidents such as damage.

The present inventor conducted various studies to improve this drawback and found that the oxide film adhesion of the present alloy is greatly influenced by the S content of the alloy. That is, it was found that as the S content increases, the oxide film adhesion deteriorates, and that by reducing the S content to 0.005% or less, stable and good adhesion can be obtained.

The present invention has been made based on this knowledge, and is an Fe-Ni-Or based soft glass sealing alloy consisting of 140 to 50% N, 15 to 7% N, and the balance Fe, and the weight percentage is less than 80005%. This is an alloy for glass sealing characterized by the following.

Next, the present invention will be explained by examples.

Alloys having the respective compositions shown in Table 1 are melted in a vacuum high-frequency induction bath melting furnace and then hot rolled and cold rolled to a thickness of 0.
Finished as a 51n board. Note that Si and Mn were added as deoxidizers during dissolution. This sample was then heated at 1150°C for 2 hours in a humid hydrogen atmosphere to form an oxide film, and then sealed with soft glass and the adhesion of the oxide film was measured. Note that Si and Mn were added as deoxidizers during dissolution. Section 12.3 is the invention alloy, A4.5 is the known alloy, and A6 is the comparative alloy.

The adhesion of the oxide film was determined by the degree of peeling of the oxide film from the alloy base when the sealed glass was broken by impact. The results are shown in Table 2. The test was conducted on 20 samples for each alloy.

Table 2 As is clear from the results in Table 2, in alloys with S content of 0.005% or less, no peeling of the oxide film was observed;
When the amount exceeds 50007%, peeling begins to occur.Or and N1 are both basic components of this alloy.When Or is less than 5% or N1 is less than 40%, the thermal expansion coefficient of the alloy becomes small and the sealing with soft glass becomes difficult. On the other hand, if Or exceeds 7% or N1 exceeds 50%, the coefficient of thermal expansion of the alloy increases, making it unsuitable for sealing with soft glass.

Therefore, Or was set to 5 to 7%, and N1 was set to 40 to 50%.

If -S exceeds 0005%, the adhesion of the oxide film deteriorates, so the upper limit was set as Q, 005%.

As explained above, the present invention is a soft glass sealing alloy made of FeNi-0r yarn that improves the adhesion between the oxide film and the base alloy, which is the most important property for a sealing alloy, and has extremely large industrial effects. It has the following.

Procedural amendment (voluntary) 117 (41159"+1511 Commissioner of the Japan Patent Office 5'6" Jl (7) Name Gala 7 sealing alloy drawing ,i:
l'li Marunouchi'rJ-1-, Chiyo Il1-ku, Tokyo
11th 2. ;,.

'/, (h'150g・1'' Ritsumeikan Co., Ltd.) Nori Kono Osode 11:,
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Claims (1)

[Claims] An alloy for glass sealing, characterized in that it is an Ffl Ni-0r based soft glass sealing alloy consisting of 015 to 7% by weight, 1J140 to 50%, and the balance being iron, characterized in that the So content is 0.005% or less.