JPH01116043A - Material for piezoelectric vibrator case - Google Patents

Abstract

PURPOSE:To obtain the above material having excellent solderability, corrosion resistance and stress corrosion cracking resistance by specifying the compsn. contg. Zn, Ni and Mn, furthermore contg. Cr, Sn, etc., as secondary components and the balance consisting of Cu. CONSTITUTION:Said material contains, by weight, 3-20% Zn, 1-15% Ni and 0.001-2.0% Mn, furthermore contains, as secondary components, 0.001-2.0% total of one or more kinds among each 0.001-2.0% Cr, Co, Zr, Be, As, P, Pb, Si, Ti, Mg, Fe and Al or 0.001-<0.1% Sn and consisting of the balance Cu with inevitable impurities. The material is made of inexpensive Cu-Zn-Ni-Mn alloy having high strength, excellent deep drawability and resistance weldability with Fe-42Ni which has been the conventional advantages of German silver and having more excellent solderability, corrosion resistance and stress corrosion cracking resistance than those of German silver.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a material for a case of a piezoelectric (crystal) resonator, and more specifically, a material for a case of a sealed piezoelectric resonator that has excellent drawing workability and corrosion resistance. Regarding.

[Conventional technology]

Piezoelectric elements are widely used in oscillators, resonators, filters, phase shifters, etc., and technical development of crystal resonators in particular is actively progressing as demand for electronic devices increases.

Piezoelectric materials include quartz and lead zirconate titanate ceramics, but when appropriate electrodes are placed on these materials and an alternating electric field is applied to them, the piezoelectric effect creates a stress of the same frequency as the piezoelectric material.
Alternatively, it causes strain, and when the frequency of the electric field matches the natural frequency of the material's elastic vibration, it resonates and causes strong vibration. A piezoelectric element takes advantage of this phenomenon, and consists of electrodes placed on a piezoelectric substrate, mechanically supported by support wires, and enclosed in a case.

Hitherto, nickel silver such as 64Cu-18Ni-Zn has been mainly used as a material for such a sealed piezoelectric (crystal) resonator case. This kind of material must have excellent properties such as strength, drawability, corrosion resistance, stress corrosion cracking resistance, plating performance, and solderability. -29Ni-
17C.

Alternatively, it is necessary to have excellent resistance weldability with Fe-42Ni.

Furthermore, piezoelectric vibrators are electronic components and cannot be treated as an exception, and even the small components that make up the piezoelectric vibrators have been reconsidered from various aspects.

The nickel silver used as the material for this piezoelectric vibrator case has excellent strength, drawing workability, and resistance weldability with Fe-42Ni, but it also has poor solderability, corrosion resistance, stress corrosion cracking resistance, and plating properties. There is a problem with N.
It is used with plating such as i-plating, and
Generally, after horizontal continuous casting, nickel silver is repeatedly cold rolled and annealed to make a plate material, which makes the process very complicated and expensive.

[Problem that the invention seeks to solve]

The present invention has the advantages of nickel silver, which has been conventionally used as a material for piezoelectric vibrator cases, such as high strength, excellent drawability, and excellent resistance weldability with Fe-42Ni. , and has superior soldering properties, corrosion resistance, and stress corrosion cracking resistance than nickel silver.
The present invention provides a piezoelectric vibrator case material made of a Ni-Mn alloy.

[Means for solving problems]

The material for the piezoelectric vibrator case according to the present invention is as follows.

Contains Zn of 3% to less than 20% by weight, Ni of 1% to 15%, Mn of 0.001% to 2.0%, and further contains Cr, Go, Zr, Be, As, as subcomponents.
P% Pb, Si, Ti, Mg, Fe, Al each 0.00
1% or more and 2.0% or less or Sn0.001% or more and 0.1
0.0% of one or more selected from the group less than 0.0%
The present invention relates to a material for a piezoelectric vibrator case, characterized in that it contains 0.01% or more and 2.0% or less, and the remainder consists of Cu and inevitable impurities.

The reasons for limiting the components and component ratios of the piezoelectric vibrator case material according to the present invention will be explained.

Cu and Zn are the basic components of the material of the present invention, and improve processability,
Improves mechanical properties and deep drawing workability.

The reason why the Zn content is set to 3 wt% or more and less than 20 wt% is that if the Zn content is less than 3 wt%, it will not be effective in improving the strength, and if it is 20 wt% or more, the soldering properties will deteriorate.

Preferably, containing 10 wt % or more of Zn provides higher strength and lower cost.

Ni is an element that improves strength, corrosion resistance, and stress corrosion cracking resistance, and the reason why the Ni content is set to 1 wt% or more and 15 wt% or less is that if the Ni content is less than 1 wt%, there is almost no effect, and if it exceeds 15 wt%. This is because processability and soldering properties deteriorate, and the price also increases.

Mn is an element that improves hot workability, deep drawability, and strength.

The reason why the Mn content is set to 0.001 wt% or more and 2.0 wt% or less is that if the Mn content is less than 0.001 wt%, there is almost no effect.

This is because if it exceeds 2.0 wt%, soldering properties will deteriorate.

In addition, the subcomponents Cr, Co, Zr, Be, As, P, P
b, Si, Ti, Mg, Fe, AI, and Sn are added as deoxidizers or elements that improve strength, and one or more of these are added at a concentration of 0°001wt% or more 2.0w
Add up to t% (however, for Sn, O,001w
t% or more and less than 0.1wt%) The reason is O,00
This is because if it is less than 1 wt%, there is no effect, and if it exceeds 2.0 wt%, the strength will improve, but the workability and soldering properties will deteriorate.

〔Example〕

Next, the present invention will be explained in detail.

An alloy having the composition shown in Table 1 was melted and subjected to hot rolling, appropriate cold rolling, and annealing to produce a plate having a thickness Q of 25 mm+ and a crystal grain size of about 10 to 15 μm.

For these alloys, tensile strength, elongation, critical drawing ratio,
Good soldering properties, Ni plating properties, and corrosion resistance.

The stress corrosion cracking resistance was investigated. The results are also listed in Table 1.

Tensile strength and elongation were evaluated using a JISS No. tensile test piece and a Tensilon type tensile tester.

The critical drawing ratio was determined by performing a deep drawing test using a 33 mφ punch.

Soldering is 230'C56S n/4P b
In a solder bath, use rosin-methanol as a flux and polish the surface with $1200 emery paper.
A test piece (0.25xlOx50) was immersed for 5 seconds to investigate the wetting state of the solder.

Ni plating properties were determined using Watts bath (240 g of nickel sulfate).
/ Q, nickel chloride 40g/Q, boric acid 35g/Q)
After Ni plating was performed to a thickness of 1.5 μm, 180° close contact surface bevelling was performed once, and the plating adhesion at the bent portion was examined.

Exposed for 196 hours, the appearance is ll! I guessed it.

Stress corrosion cracking resistance was determined in accordance with JIS C8306 for each material before and after Ni plating (1.5 μ@) formed into a cup with a blank diameter of 66+ m and a punch diameter of 33 in a desiccator with an internal volume of 10 fl containing test liquid IQ. (20+
After 100, 200, and 500 hours, the samples were taken out of the desiccator and checked for cracks.

In addition, the test liquid is about 7 g of special grade ammonium chloride.
00 mQ of distilled water, and add a solution of 50 to 70 g of special grade sodium hydroxide dissolved in about 250 mQ of distilled water, and when the hydrogen ion concentration (pH) reaches 10, the total amount becomes about IQ. Distilled water was added to adjust.

As is clear from Table 1, compared to the comparative alloys, the alloy of the present invention has good strength, solderability, corrosion resistance, deep drawability,
It also has excellent stress corrosion cracking resistance.

Moreover, it has the characteristic that it can be manufactured at a significantly lower cost than other materials such as nickel silver.

〔Effect of the invention〕

As detailed above, the alloy of the present invention has sufficient strength, deep drawability, good stress corrosion cracking resistance, and is inexpensive, so it is optimal as a material for a piezoelectric vibrator case.

Claims (1)

[Claims] (1) Zn of 3% or more and less than 20% by weight, 1% or more1
5% or less Ni, 0.001% or more and 2.0% or less Mn
Cr, Co, Zr, Be, As, P, P in an amount of 0.001% or more and 2.0% or less as subcomponents.
b, one or two selected from the group of Si, Ti, Mg, Fe, Al, or 0.001% or more and less than 0.1% Sn
Contains 0.001% or more and 2.0% or less of seeds or more in total amount,
A material for a piezoelectric vibrator case, characterized in that the remainder consists of Cu and unavoidable impurities.