JPS616251A - Seal bonding fe-ni-co alloy with superior suitability to blanking - Google Patents

Abstract

PURPOSE:To obtain a seal bonding Fe-Ni-Co alloy with superior suitability to press blanking and curring by specifying the composition of an alloy and the size of nonmetallic inclusions of Mn, Si and one or more among Al, Zr, Ga, Mg and REM dispersed uniformly in the structure. CONSTITUTION:The composition of a seal bonding Fe-Ni-Co alloy is composed of, by weight, 25-35% Ni, 13-20% Co, 0.03-0.3% Si, <0.05% C, 0.05-1% Mn, 0.003-0.025% S (Mn/S>=10), <100ppm O, <50ppm N and the balance Fe with inevitable impurities. 0.0005-0.1% one or more among Al, Zr, Ca, Mg and REM may be added to the composition. Fine nonmetallic inclusions of Mn, Si and one or more among Al, Zr, Ca, Mg and REM having <=3mum size are uniformly dispersed in the structure.

Description

[Detailed description of the invention] Industrial field This invention is applied to Fe-N1-
The present invention relates to a Co-based sealing alloy, and relates to a Fe-Ni-Co-based sealing alloy that has excellent punchability and cutting workability.

Background art Generally, 25-35wt%Ni 13-20wt%C
o -F* Since the thermal expansion characteristics are similar to those of gold alloys, glass, and ceramics, after processing into thin plates or thin wires,
The IC is punched or etched into the desired shape.
, lead frames for display elements, and ICs.

It is widely used for the leads of transistors and reed switches, and during manufacturing, large seedlings are produced continuously.

The lead frames and leads mentioned above have very fine patterns and require extremely high dimensional accuracy, so when punching them using a high-speed press, conventional Fe-Ni Co
Sealing alloys have problems such as poor punching workability, severe wear of molding dies, infrequent repair and polishing of press dies, and lower production efficiency, leading to higher product costs. Ta.

[1] This invention is an Fe material with improved press punchability and cutting workability.
-Aimed at Ni-Co based sealing alloys.

Structure and Effects of the Invention The present invention has been made by studying various alloy compositions for the purpose of improving the punching property and cutting processability of Fe NL Co-based sealing alloys, and as a result, the composition of the alloy has been specified, and Uniformly dispersed Mn, SL and /V, Zr, Ca, l'b
, R. By specifying the size of nonmetallic inclusions such as nitrides, carbides, oxides, and sulfide parts, Fa-Ni
It has been discovered that the punchability and cutting workability of -ω-based special alloys are significantly improved.

In other words, this invention has Ni25-35wt%, Co13-20wt%, Si
0.03-0.50 wt%, C0105 wt% or less, Mn 0.05-1.00 wt%, S 0000
3~0.02! iwt%, however, Mn/S≧10゜0 100p100pp lower, N 50+11111
114 below, or further comprising A1. Zr,C
a, MC1. At least one of R/E (7) 0.0
005 to 0.10 wt%, and the remainder consists of e and unavoidable impurities, including Si, Mll
A punching process characterized in that fine nonmetallic inclusions of 3 or less, such as oxides, nitrides, carbides, and sulfides of AN, Zr, Ca, Mg, and [E, are uniformly dispersed in the structure. This is an e-Ni-Co based sealing alloy with good properties.

In general, when a Fe NL Co sealing alloy is punched and cut using a die (force, punch (8)) as shown in Figure 3, the cut surface state is as shown in Figure 1. A continuous sag (2) from the flat part (1), a sheared surface (3),
It consists of a fracture surface (4) and a burr surface (5), and the relationship between the punch stroke, which is the travel distance of the punch, and the shear resistance (R), which is the force required for cutting, is It is known that the curve shown in the figure is obtained.

In Figure 2, the smaller the maximum shear resistance and the smaller the punch stroke until breakage, the smaller the energy required for cutting, the less the load on the mold, and the longer the mold life. , is determined by mechanical strengths such as tensile strength and hardness of the material to be punched, and the punch stroke until cutting and (sheared surface thickness/plate thickness) are almost directly proportional.

In addition, it is believed that (sheared surface thickness/plate thickness) is greatly influenced not only by the mechanical strength of the material but also by the internal properties of the material, such as the amount of trace elements, precipitates, and inclusions.
By limiting the composition and specifying the size of non-metallic inclusions, (sheared surface thickness/plate thickness) can be reduced, the punch stroke until cutting can be reduced, and the life of the mold can be extended.

Reasons for limiting the composition N1 is a basic component of water-based alloys that require strong adhesive bonding with hard glass, alumina ceramics, etc., and is selected appropriately taking into account the content of these materials, but if it is less than 25 wt%, The coefficient of thermal expansion becomes too small, and if it exceeds 35 wt%, the coefficient of thermal expansion becomes too large, and the deviation from the coefficient of thermal expansion of glass or ceramics becomes large, which is not preferable, so it is limited to 25 wt% to 35 wt%.

CO is a basic component of water-based alloys that require strong adhesive bonding with hard glass, alumina ceramics, etc., and N
The L content is appropriately selected in consideration of the L content, but if it is less than 13 wt%, the coefficient of thermal expansion will be too small, and if it exceeds 20 wt%, the coefficient of thermal expansion will be too large.
This is not preferable because the deviation from the coefficient of thermal expansion of ceramics becomes large, so it is limited to 13 wt% to 20 wt%.

Sl is a deoxidizing element that prevents the generation of bubbles in the ingot,
It also has the effect of improving the adhesion of the surface oxide film, which is important when sealing glass, but if it is less than 0.03 wt%, it has no effect, and if it exceeds 0.50 wt%, the material will harden and become cold. It is not preferable because machinability deteriorates, and 0.0
3 wt% to 0.50 wt%%.

C (0.05 wt%) during the heating process during close contact with glass or ceramics, it is generated as a gas from the surface and is included in the arriving interface, reducing the sealing strength.
Limited to the following.

Mn has the effect of improving hot workability, but 0.05
If it is less than 1.00 wt%, it will not have the effect described above, and if it exceeds 1.00 wt%, the coefficient of thermal expansion will become too large, resulting in glass.

0.05wt to inhibit the sealing property with the lamix.
% to 1.00 wt%.

S combines with 1 in the alloy to produce fine sulfides, which are uniformly dispersed within the structure and improve press workability, but if it is less than 0.003 wt%, the improvement effect is small;
If it exceeds 25wt%, giant monosulfides are likely to be generated, and defects such as surface peeling and cracks are likely to occur when processing into thin plates, etc., so 0.003W [% ~ 0.025wt%]
%.

The content ratio of Mn and S, Mi/S, is limited in order to prevent S from remaining in the structure, reducing hot workability and making defects such as cracks more likely to occur. It is necessary to satisfy Iin/S≧10. However, the upper limit thereof is preferably 300, and the preferable lln/S range is 35 to 200.

0 and N are Si and Nn from the viewpoint of breath-beating bamboo.

M, Zr, Ca, r, R・E (rare earth elements)
oxide.

As a nitride, it is desirable that minute inclusions are uniformly distributed within the structure, and from the viewpoint of improving hot heating Tv1 and cold preheating properties, O is 1100 pp or less and N is 50 ppm or less.
It is necessary to keep it below ppm.

Al, Zr, Ca, M (1.R-"(Rare earth elements) are
Nj, S, 0. than Fa. Since it has a strong affinity with C and N, it produces oxides, carbides, nitrides, and sulfides, and has the effect of improving press workability, so at least one of the above elements is added, but o, ooos If it is less than 0.10 wt%, the above effect will not be obtained, and if it exceeds 0.10 wt%, the hot workability and cold workability will be deteriorated, which is not preferable.
005 wt% to 0.10 wt%.

Further, the above R.[(rare earth element) is at least 1[
It suffices to use rare earth elements of i. C4
and Mitsushmetal are preferred.

Fe constitutes the basic composition of the water-based alloy, and is the residual range containing the above-mentioned various elements.

Si, Mn, AI, Zr, Ca, F'a,
The reason for limiting the size of nonmetallic inclusions such as oxides, carbides, nitrides, and sulfides in the structure of R・E is that if the size of nonmetallic inclusions exceeds 3 mm, the punching ■This is because the force error during cutting increases and becomes the starting point for cracking during bending and drawing of thin plates. It is important that it is uniformly dispersed and contained.

In addition, in this invention, in order to reduce the size of nonmetallic inclusions in the alloy composition to 3 mm or less and to uniformly disperse and distribute them, it is necessary to adjust the melting conditions, agglomeration conditions, the addition timing of the deoxidizing agent, and the additive layer. It is necessary to select it appropriately.

Further, the preferred composition range of this invention alloy is Ni25~
35wt%, C013~20wt%, 3i 0.10
~0.30 wt%, (:, 0.03 wt% or less, Mn 0.35-0.85 wt%, S 0.00
3-0.015wt%, however, Mn/5=35-20
01 Q 100pp111 or less, N 50ppm or less,
or further contains Al, Zr, Ca, M (1
．． [0.0005 to 0.05 of at least one of E
It is preferable that fine nonmetallic inclusions of 3% or less are uniformly dispersed at 60ppm or more, with the balance consisting of Fe and unavoidable impurities.

Examples As shown in Table 1, Fe-NL-Co based moonshine alloys having various composition ranges within the scope of the present invention and outside the scope of the present invention,
It was manufactured under the same conditions and finished into a thin plate with a thickness of 0.25 mm. A sample with a width of 8111Ni x length of 50 mm was taken from this thin plate, and as shown in Figure 3, using a compression tester, the sample (6) placed on a die (width of 7 mm x length of 10 m) was measured.
Press punching was carried out using a punch (8) of size m, and the punch stroke (9) was measured by the moving distance of the movable arm of the testing machine, and the shear resistance (R) was measured by a load cell.

From this, a relationship diagram between shear resistance (R) and punch stroke (1) similar to that shown in FIG. 2 was obtained, and the bond stroke up to cutting was actually measured.

In addition, the cut cross section of the sample after punching was observed under an optical microscope, the sheared surface thickness and plate thickness were measured, and (sheared surface thickness/plate thickness) was calculated.

The amount of inclusions in various alloys can be determined by dissolving only metals using constant potential electrolysis, and removing non-metallic inclusion residues such as oxides, carbides, nitrides, and sulfides from the solution using a microfilter. and those exceeding 3.0) B were separated and measured.

The above measurement results are shown in Table 1 along with the mechanical strength and thermal expansion properties of the samples.

As is clear from Table 1, Fa-Nj according to the present invention
-The Co-based sealing alloy has a much smaller punch stroke and (shear surface thickness/plate thickness) until cutting than the conventional alloy in the comparative example, and can be punched without compromising the required thermal expansion characteristics and mechanical strength. It is clear that the punching and cutting workability has been improved, and it can be seen that this has a great effect on extending the life of the mold.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a cut section of a Fe-NL Co sealing alloy, and FIG. 2 is a graph showing the relationship between punch stroke (A) and shear resistance (R). FIG. 3 is an explanatory diagram of the compression test apparatus in the example. 1... Flat part, 2... Sagging surface, 3... Sheared surface, 4
...Fracture surface, 5...Burning surface 6...Sample, 7...
・Die, 8... Punch. Applicant Sumitomo Special Metals Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 Ni25-35wt%, Co13-20wt%, S
i0.03-0.50wt%, C0.05wt% or less,
Mn0.05-1.00wt%, S0.003-0.0
25wt%, provided that Mn/S≧10, O100ppm or less, N50ppm or less, the remainder consists of Fe and unavoidable impurities, and fine nonmetallic inclusions of 3μm or less are uniformly dispersed in the structure. A Fe-Ni-Co sealing alloy with good punchability. 2 Ni25-35wt%, Co13-20wt%, S
i0.03-0.50wt%, C0.05wt% or less,
Mn0.05-1.00wt%, S0.003-0.0
25wt%, however, Mn/S≧10, Al, Zr, Ca
, Mg, and at least one of R and E from 0.0005 to
A Fe-Ni-Co seal with good punchability, containing 0.10 wt%, 100 ppm or less of O, and 50 ppm or less of N, and having fine nonmetallic inclusions of 3 μm or less uniformly dispersed in the structure. Arrival alloy.