JPS6053476B2 - Materials for magnetostrictive vibration propagation media - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to materials for use in magnetostrictive vibration propagation media, and particularly aims to provide materials that are optimal as materials for magnetostrictive vibration propagation media used in electronic devices and measuring devices that utilize the magnetostrictive effect. be.

Conventionally, materials of this kind, that is, magnetostrictive materials, include metallurgically produced Fe-Co alloy, 13Al-Fe alloy, 2% V-
Fe--Co alloy, pure nickel, Fe--Ni alloy, etc. are known.

Among these conventional magnetostrictive materials, Fe--Co alloys, particularly those having an alloy composition of 10 to 55% Fe and 90 to 45% CO, have extremely good magnetic properties.

However, like other conventional materials other than pure nickel, it has weaknesses in machinability, and in particular, it is impossible to obtain a thin plate of about 0.1 mm. It was almost at its limit.

In addition, pure nickel material, which has good machinability and solder adhesion, has a low magnetostrictive effect, coercive force, and magnetic properties, so it is a magnetostrictive material that has not been given much attention in recent years.

The ease of machining that this nickel material plate has,
In other words, it has many advantages such as being able to roll relatively thin plates, being inexpensive and easily available, and being structurally stable as it is almost a single metal. Ta. Therefore, the present inventors have conducted repeated research with the aim of improving this conventional nickel material into a material that is sufficient and extremely effective as a material for tablets such as coordinate reading devices, that is, as a magnetostrictive vibration propagation medium. As a result, the present invention was achieved.

That is, one of the improvements was to improve the low magnetic properties, which were the weak point of conventional nickel materials, to the same level as Fe--C alloys.

Another important point to improve is that the ease of machining, or the ability to form thin plates by rolling, which has traditionally been an advantage of nickel materials, has extremely large technical difficulties when applied to the magnetostrictive vibration propagation medium. , the solution was to solve this problem.

In other words, as a magnetostrictive vibration propagation medium for a tablet, it has a relatively wide area (even a general-purpose one has a surface area of about 0 square
(Sometimes it can be up to 2 Wi, square), and it is necessary to make a so-called seamless integral board, and in terms of board thickness,
In response to the requirement that the best vibration propagation characteristics can be obtained with a thickness of 100μ or less, conventional rolled nickel materials can only be manufactured by hand with widths within and outside the WO.
Furthermore, the plate thickness was limited to about 0.5 TIa, and the plate had a specific magnetic directionality due to rolling, which was a disadvantageous situation.

The material of the present invention is thus obtained by solving the technical difficulties in forming the propagation plate and at the same time successfully improving the aforementioned poor magnetic properties.

Hereinafter, the material of the present invention will be specifically explained based on various characteristic measurement data and an example of the development progress.

The characteristics of the material of the present invention are that the thickness range is from 5μ to 0.5μ? A magnetically isotropic nickel plate is obtained through an electrodeposition process, and the electrodeposited plate is heated at a heating temperature of 1.
It is obtained by heat treatment at a temperature of 50 to 50 degrees.

Therefore, an example of electrodeposition processing in electrodeposition formation will be described below.

Electrodeposition treatment example 1 Plating bath composition Nickel sulfate 250y1e Nickel chloride 45yIe Boric acid
30y1e-Plating conditions cathode current density 5AId-anode current density
5A'DWt bath temperature
5. Stirring
none. PH3.2 Under these electrodeposition conditions, the plated substrate was electrocoated as a mirror-finished stainless steel plate to obtain several nickel plates with different thicknesses, and after the electrodeposition process, the nickel plate layer was removed from the substrate. Peeled off.

Further, in this electrodeposition process, there is an example in which 0.1f11 of saccharin is added to the above-mentioned plating bath composition as an additive to positively impart appropriate elasticity to the plate.
It has been found that the plate material of the electrodeposited nickel material is moderately hardened by adding this elasticity accelerator, and has extremely effective properties compared to a material without such an additive.

Furthermore, the plating bath composition, plating conditions, etc. in the electrodeposition treatment are not limited to the above-mentioned embodiments, and methods commonly practiced by those skilled in the art may be used.

Next, the nickel plate material formed by the electrodeposition process as described above was placed in the atmosphere, that is, in an oxidizing atmosphere, for about 1 hour at 150°C.
The material of the present invention was obtained by heating at a temperature of .degree. C. to 500.degree. C. and rapidly or slowly cooling in the atmosphere.

Through such processing, the inventors were able to obtain samples of different plate thicknesses of 15p130p14? , 6 cars, 7 songs, 90μ and 1
50 p was selected and a characteristic comparison experiment was conducted between each sample and a conventional rolled-formed nickel plate material, and characteristic data diagrams as shown in FIGS. 1 and 2 were obtained.

That is, Fig. 1 is a diagram showing output voltage data with respect to the plate thickness of the sample, and Fig. 2 is a diagram showing output voltage data with respect to heat treatment temperature in the range from room temperature to 550C. An unheat-treated rolled nickel plate sample, line b is a nickel plate sample formed by electrodeposition but not heat-treated, line c is a nickel plate sample formed by electrodeposition and further heat-treated at 30 C),
Wire d was treated with a plating bath containing accelerating additives that add elasticity or harden during electrodeposition, and then heated at 300°C.
This is a sample that was heat-treated.

Therefore, the samples according to the present invention are shown by lines C and d. It should be noted that only the sample indicated by line a was a standard plate thickness product in the experiment. The method for measuring the output voltage is to form each of the above-mentioned samples into a strip shape with a length of about 140 m, and apply a voltage of 0.2 m to one end of the strip shape.
An excitation winding made of 20 turns of conductive wire of Φ is provided, and an excitation power of 180 V and 10 A is applied to this winding to generate a magnetostrictive vibration delayed wave in the strip material, and approximately 70! ! The voltage output due to the magnetostrictive vibration wave was detected using a pickup coil with a coil diameter of 10Φ and a number of turns of 100 at a position remote from the IR.

In addition, line A in FIG. 2 is a conventional rolled-formed nickel material sample, and line B is a material sample according to the present invention. 30I&, line D is for plate thickness 45-901P, line E is for plate thickness 4
5 to ■i are shown, respectively.

Furthermore, the output voltage value in Figure 2 was measured using the same measurement method as in Figure 1 (
There is a difference in the position on the detection side).

In addition, the dashed line display area from each line in Fig. 1 is drawn based on the results obtained from another experiment by the present inventors, and at the same time, the plate thickness is 0.5Tr1, IWL, for practical purposes. I learned that there are limits. From the experimental results shown in Figures 1 and 2, it is clear that conventional rolled nickel materials have difficulties in obtaining high-precision propagation media in terms of magnetic properties, as previously evaluated. In the case of heat treatment, although there is a considerable improvement in the characteristics, the improvement in characteristics is only seen in the vicinity of the excitation winding, and as the distance from the excitation part increases, the output voltage drops, and the state of the drop is It turns out that the degree is inversely proportional to the square of the separation distance.

In contrast, the material according to the present invention exhibits extremely remarkable output voltage characteristics, that is, magnetostrictive vibration propagation characteristics, and is similar to the conventional Fe-CO material.
It was found that it has magnetic properties comparable to those of alloys. Furthermore, it has been found that products containing additives for adding elasticity have even better properties. It was found that the nickel material containing this additive tends to be harder than the material without the additive.

In other words, it can be considered that such hardening adds elasticity to this type of propagation medium, making the vibration propagation characteristics more effective. It was also found that less than 3% of foreign elements were mixed into the nickel due to the addition of brighteners as additives for adding elasticity. In this example described above, sulfur was mixed. This is due to the use of saccharin brightener as an additive. As a different element, in addition to sulfur,
Phosphorus, silicon, boron, etc. may be mixed in by using other brightening agents, but this small amount of mixing of different metals poses no problem due to the characteristics of the material of the present invention.

As explained above, the material of the present invention has the advantage of being able to provide a seamless plate having a desired area, that is, as an integral plate, in the production of a magnetostrictive vibration propagation medium such as a tablet. Also, there is an advantage that the plate is thin, magnetically isotropic, and can be easily produced without any cost pressure. In fact, according to the tests carried out by the present inventors, for example, compared to Fe-CO alloy plating,
Achieved a 40% cost reduction. A simple comparison would list advantages such as lower cost of the plating chemicals used and ease of managing the electrodeposition process (maintaining stability of the plating bath, plating conditions, etc.). Furthermore, the material of the present invention not only has magnetic properties comparable to or better than other alloy magnetostrictive materials, but also has a single metal structure, so it is structurally strong and stable. Moreover, as a ripple effect, stabilization of the operating characteristics can be expected, which is a major effect, and the benefits it brings to electronic control element components including magnetostrictive diaphragms are immeasurable.

[Brief explanation of the drawing]

The drawing is a line j diagram showing the experimental results of the material according to the present invention, and Fig. 1 shows the output voltage with respect to the plate thickness of each sample, and Fig. 2 shows each data of the output voltage with respect to the heat treatment temperature. It is a line diagram.

Claims (1)

[Claims] 1. A nickel plate having a thickness range of 5μ to 0.5M/M is obtained through electrodeposition treatment, and this nickel plate is further heat-treated at a heating temperature of 150 to 500°C. A material for magnetostrictive vibration propagation media. 2 A nickel plate with a thickness range of 5μ to 0.5M/M is obtained by electrodeposition using a plating bath mixed with an additive for promoting elasticity, and the nickel plate is heated to a temperature of 150 to 150℃. A material for a magnetostrictive vibration propagation medium, characterized by being heat-treated at 500°C.