JPH0323618B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to improving the hot workability of Fe-Ni alloys and ensuring appropriate wetting with glass.

[Conventional technology]

Invar (Fe-36Ni) as a high Ni alloy,
DF42N (Fe−42Ni), DF52N (Fe−52Ni),
Kovar (Fe−17Co−29Ni) or 42−6 (Fe−
42Ni−6Cr), many types of Fe−Ni, Fe−Co−
Ni and Fe-Ni-Cr alloys have been developed and are in practical use. Some of them are used as magnetic materials, while others are used as low thermal expansion alloys or thermal expansion control alloys. The latter is mainly used for IC
It is a lead frame material that is often used by sealing the alloy with glass or ceramics, and alloys with linear expansion coefficients that match the thermal expansion of the material to be combined are provided. With the recent progress and sophistication of electronics technology, precision processing has become necessary for sealing alloys, whether they are made into wire or plate materials. However, as is well known, high
Ni alloys do not have good workability, so improvement is desirable. Furthermore, the sealing alloy is required to have appropriate wettability with glass. Of course, the wetting must be good, but if it is too good, the glass will flow along the alloy surface, which will interfere with the airtight seal.

[Problem to be solved by the invention]

In view of these circumstances, the purpose of the present invention is to
In addition to improving hot workability in high Ni alloys (hereinafter collectively referred to as "Fe-Ni alloys"),
The purpose is to provide a product that ensures adequate wettability with glass.

[Means to solve the problem]

The basic composition of the Fe-Ni alloy with good hot workability of the present invention is C: 0.020% or less, Si: 0.50% or less,
Mn: 1.5% or less, Ni: 32.0-55.0% and Al:
In an Fe-Ni alloy containing 0.10% or less, the balance consisting of Fe and impurities, Mg: 0.030% or less,
S: 0.020% or less, Mg%/S%: 0.3 to 4.0
It is characterized by Of the Ni content for the above basic composition,
It is possible to replace the range of 4.0 to 20.0% with Co, to further contain Cr in an amount of 10.0% or less, or to do both simultaneously. It is also preferable that the content of impurities other than Mg and S be within the following regulatory values (unit: ppm). Ca: 100 Zn: 60 N: 80 As: 100 Pb: 20 Sb: 60 Bi: 10 Ag: 20 Sn: 100 B: 200

[Effect]

The function and addition amount of each component constituting the alloy of the present invention are the same as those of a commonly used Fe-Ni alloy, and the reasons for limiting the composition are as follows, as in the past. C: 0.020% or less If the content of C is high, bubbles are likely to be generated during sealing. In order to avoid any problems in airtight sealing with glass, the upper limit of C is set to 0.020% or less. Si: 0.5% or less Added as a deoxidizing agent. If Si exceeds 0.5%, the hot workability of the alloy decreases, so this was set as the upper limit. Mn: 1.5% or less Mn is also a deoxidizing agent. If the Mn content increases, it becomes difficult to adhere to the glass, so keep it below 1.5%. Ni: 32.0~55.0% (32.0~55.0% when containing Co)
51.0%) At least 32.0% Ni is required to obtain an alloy with a low coefficient of thermal expansion. On the other hand, Ni is 55.0%
If the amount exceeds 100%, the coefficient of thermal expansion becomes large and it becomes impossible to ensure proper wetting with the glass. Cr: 10.0% or less Cr is an element added as necessary. When Cr is added, an oxide film is formed on the surface of the alloy, improving its adhesion to glass. However, adding Cr in an amount exceeding 10.0% results in an increase in the coefficient of thermal expansion. Co: 4.0 to 20.0% Co moves the thermal expansion coefficient curve of the Fe-Ni alloy to the low Ni side. This effect becomes noticeable when the amount of Co added is 4.0% or more, but if it is too large, the coefficient of thermal expansion will increase, so it is limited to 20.0%. Al: 0.10% or less Al is a deoxidizing agent, but excessive inclusion will only impair the cleanliness of the alloy, so the amount added should be 0.10% or less. The reason why the content of impurities in the alloy of the present invention is regulated as described above is as follows. Mg: 0.030% or less Mg exists in trace amounts, for example 0.0015 to 0.15%.
Impurities are always desirable elements in terms of improving the hot workability of Fe-Ni alloys, but if they are present in large quantities, they not only impair hot workability but also abnormally increase wetting with glass. Stop within %. This is thought to be because the presence of a large amount of Mg increases the number of oxide-based (or even sulfide-based) inclusions, which react with the glass and become wettable. S: 0.020% or less Good hot workability can be obtained by keeping the amount to a very small amount. %Mg/%S: 0.3-4.0 The reason why selecting this ratio within the above specific range improves hot workability is not well understood, but
This range was experimentally obtained as a ratio that gives a value of 50% or more when the Greeble reduction of area is taken as a measure of hot workability. Ca and other impurities: By suppressing the content of Ca and other impurities within the above-mentioned certain limits, an alloy with very high hot workability can be obtained. Example 1 Fe-Ni alloys having the compositions shown in Table 1 were melted and tested for hot workability and wettability. As for hot workability, Greeble reduction of area (%) at 1100℃
In addition, the wettability was determined based on the degree of flow at the sealing temperature of the glass, and whether or not it was suitable for hermetic sealing was determined. The results are also shown in Table 1. In Table 1, *marks are comparative examples, and no marks are examples. It can be seen that the ratio of %Mg/%S is important in order to obtain the desired levels of both hot workability and wettability. Example 2 Fe-Co-Ni alloys having the compositions listed in Table 2 were melted and tested in the same manner as in Example 1. Excessive Mg content has been demonstrated to be too wet and unsuitable. Example 3 Fe-Ni-Cr alloy having the composition shown in Table 3 and
Fe-Co-Ni-Cr alloys having the compositions shown in the table were produced and tested. It was confirmed that according to the present invention, excellent hot workability and wettability can be obtained at the same time. Example 4 Fe--Ni alloys having the compositions shown in Table 5 were tested. It has been shown that in addition to the conditions of the present invention regarding Mg and S, extremely excellent hot workability can be obtained by controlling the amounts of other impurities.

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【Effect of the invention】

By regulating the content of impurities, the alloy of the present invention achieves both improved hot workability and appropriate wetting with glass. Therefore, this alloy is suitable as a sealing alloy, particularly as a lead frame material for ICs.

Claims (1)

[Claims] 1 C: 0.020% or less, Si: 0.50% or less, Mn: 1.5
Fe-
In Ni alloy, Mg: 0.030% or less, S: 0.020
% or less and Mg%/S%: 0.3 to 4.0. 2. The Fe-Ni alloy according to claim 1, in which the content of impurities is within the following regulatory values (unit: ppm). Ca: 100 Zn: 60 N: 80 As: 100 Pb: 20 Sb: 60 Bi: 10 Ag: 20 Sn: 100 B: 200 3 C: 0.020% or less, Si: 0.50% or less, Mn: 1.5
% or less, Ni: 32.0 to 51.0%, Co: 4.0 to 20.0% (however, the total amount of Ni and Co does not exceed 55.0%), and Al: 0.10% or less, with the balance consisting of Fe and impurities. −In Ni alloy, Mg: 0.030
% or less, S: 0.020% or less, Mg%/S%:
An Fe-Ni alloy with good hot workability characterized by a hardness of 0.3 to 4.0. 4 C: 0.020% or less, Si: 0.50% or less, Mn: 1.5
% or less, Ni: 32.0 to 55.0%, Cr: 10.0% or less and Al: 0.10% or less, with the balance consisting of Fe and impurities, Mg: 0.030
% or less, S: 0.020% or less, Mg%/S%:
An Fe-Ni alloy with good hot workability characterized by a hardness of 0.3 to 4.0. 5 C: 0.020% or less, Si: 0.50% or less, Mn: 1.5
% or less, Ni: 32.0 to 51.0%, Co: 4.0 to 20.0% (however, the total amount of Ni and Co does not exceed 55.0%), Cr:
In a Fe-Ni alloy containing 10.0% or less and Al: 0.10% or less, the balance consisting of Fe and impurities, Mg: 0.030% or less, S: 0.020% or less, and Mg%/S%: 0.3 to 4.0. An Fe-Ni alloy with good hot workability.