JPS58174556A - Alloy for sealing soft glass - Google Patents

Abstract

PURPOSE:To provide the titled alloy high in hardness after annealing and mechanical strength and made hardly deformable, obtained by limiting the composition of an alloy comprising Ni, Cr, Si, Mn, Al, one kind or more Nb, Ta, Ti Mo or W and the remainder Fe. CONSTITUTION:An alloy containing, on the wt. basis, 38-46% Ni, 4-7% Cr, 0.05-0.5% Si, 0.05-0.5% Mn, 0.05-0.5% Al, one kind or more Nb, Ta, Ti, Zr or W and the remainder substantially Fe melted in a heating furnace is formed into a plate material by hot rolling or cold rolling and the obtained plate material is annealed at 900-1,200 deg.C to obtain a soft glass sealing alloy with Vickers hardness of 120 or more. This alloy is heated to about 900-1,200 deg.C in wet hydrogen to form an oxide film on the surface thereof and the resulting alloy is used in sealing glass as an alloy having coefficient of heat expansion almost same to that of glass and high in sealing strength with glass and mechanical strength.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to improving the alloy of Mi-0r-IF for sealing soft glass used in lead frames of fluorescent display tubes, etc.◇ , the thermal expansion coefficient is similar to that of glass, and the sealing strength with glass is strong, giving it a 4! ! %M1-6%0r-7 alloy is widely used. This alloy generally forms an oxide layer with good wettability with glass glass, and is sealed with glass via this oxide layer. However, this alloy becomes very soft when heated to such high temperatures, even if Ifil
When heated at ooo C, the Vickers hardness becomes around W5, and it becomes easily deformed by even the slightest external force.

Therefore, when a lead frame processed from a thin plate of this alloy by pressing or photoetching is subjected to oxidation treatment and sealed to the glass of a fluorescent display tube, the lead frame is It often becomes deformed, lll1j! The yield of No. 1 was significantly lowered.

Furthermore, there are many defects caused by deformation of the leads during the process of assembling fluorescent display tubes into various electronic devices (e.g., watches, calculators, automobile instruments, etc.), deformation of the leads due to vibrations and shocks during use of the device, etc. This low mechanical strength has been a major drawback in using this alloy.

The present invention was made to increase the mechanical strength of the 42% M1-6% Or-'Me alloy and eliminate the above-mentioned drawbacks.
% inhibition α05~α5%, 05~05% % rib ■6~α
This includes Jlb, Ta, T1, Zr%Mo,
W: Contains αON% in total of L@ or 211 or more, and the remainder is substantially ye, and the hard blindness when annealed at a temperature of 900CNzgooC is 11 on the Vickers hardness! This is a soft glass sealing alloy characterized by having a grade of D or higher.

Hereinafter, the present invention will be explained in detail with reference to Examples. Alloys having the respective compositions shown in Table 1 were melted in a vacuum high-frequency induction heating furnace,
After hot rolling and cold rolling to obtain a plate material of 0.2 m in length, the sample was annealed at 1000p for 30 minutes in a hydrogen atmosphere, and the thermal expansion coefficient and Vickers hardness of the sample were measured.

The results are shown in SaW. Thermal expansion coefficient is 30 C-40
The average coefficient of thermal expansion between 0 and Vickers hardness is
Compared to the conventional 4g1ii-6Or-'F alloy, the alloy of the present invention has a hardness of approximately 10001 after annealing.
It can be seen that the price has increased by ~30%. In addition, the alloy of the present invention was heated at 1000 U for 30 minutes in wet hydrogen at 30 C to form an oxide film on the alloy surface, and then sealed with powdered soft glass. The adhesion properties were good. Table 1 Table 8 Next, the reasons for limiting the scope of patent claims for the alloy of the present invention will be described. First, Ml and Or are both basic components of this alloy, and if N1 is less than 38% or 6r is less than 4%, the thermal expansion coefficient of the alloy will be too low, making it unsuitable for sealing with soft glass. If Ml exceeds 46% or Or exceeds 7%, the coefficient of thermal expansion of the alloy becomes too high, making it unsuitable for sealing with soft glass. Therefore, the ratio was set to 38 to 46%, and the Or was set to 4 to '7%.

It is preferable that Bi, Mxh and Mut be contained in small amounts in order to improve deoxidation and desulfurization during melting of the alloy, improve the compatibility between the oxide film and the glass, and improve the adhesion between the oxide film and the underlying alloy. If the content is less than 005%, there will be no effect, and if it exceeds α5%, the hot workability of the alloy will be impaired.
, Zr%Mo and W are iI8 of the alloy after annealing.
It is an alloying element added to increase α, but if any one or two of these, or the total of the above, is less than α05%, it has no effect, and on the other hand, if it exceeds 3%, hot workability is impaired. Also, heating in wet hydrogen would have an adverse effect on the properties of the oxide film and impair the glass sealing properties, so it was limited to 003-6%.

As explained above, the alloy of the present invention has the following characteristics compared to the conventional alloy:
Because the alloy after oxidation treatment has a high hardness and is difficult to deform, when used as a lead frame for a fluorescent display tube, etc., it may be deformed during handling during the wrinkle forming process, or deformed or damaged due to vibration or impact during use of the display tube. This reduces the number of defects caused by this process, and the industrial effect is extremely large.

−325=

Claims (1)

[Claims] Outside of weight, Ni158-46%, Or4-7%, Siαo
(L5%, corridor α05~α5%, AjCLOfl~α
B%, including Wb, TaTi) Zr,
Me, W, or more than 21 in total α
05-3%, the balance consists essentially of 70%, 900C~
zgoot? An alloy for soft glass sealing, characterized in that its hardness when annealed at a temperature of 5 bits hardness is 1 aO or more.