JPS6354774B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an amorphous material for magnetostrictive applications. Conventionally, nickel, 13% Al-iron alloys, various ferrites, etc. have been put into practical use for this type of use.
Although these all have relatively large values of magnetostriction λ, the electromechanical coupling coefficient K, which indicates the conversion efficiency of converting electrical energy into mechanical energy, which is a practical problem, is only about 0.4 at most. The reality is that there are various problems such as poor energy efficiency and heat generation. In other words, in the case of 13% Al--Fe alloy, which is the most commonly used metal material, cold rolling to form a thin sheet is extremely difficult, and corrosion resistance is extremely poor. On the other hand, ferrite-based materials having a relatively large electromechanical coupling coefficient have a major drawback in that they are extremely susceptible to cracking and cracking as magnetostrictive elements due to their brittle nature. The present invention provides a new material that eliminates these drawbacks of conventional materials. In other words, the material of the present invention not only has a larger electromechanical coupling coefficient than conventional materials, but it is also extremely easy to make into a thin plate, which is necessary to improve high frequency characteristics, and is a metal material that has excellent corrosion resistance. In addition, the material itself has excellent toughness, and a major feature is that defects such as cracks and chips that occur with ferrite do not occur at all. The present invention basically consists of metal elements including Fe, Ni, Co, and Cr and Si, B, and P as metalloid elements.
It is made of an amorphous alloy containing one or more selected from C and C. Cr is an essential component to become amorphous and significantly improve corrosion resistance, and in the case of the present alloy, this amount is
If it is less than 0.05%, the effect will be small, but if it is more than that, the more the better. However, if it exceeds 10%, the effect on the electromechanical coupling coefficient becomes large, and this is to be reduced, so it is preferably 0.05% or more and 10% or less (in terms of atomic ratio, the same applies hereinafter). In addition, the content of P, Si, B, and C, which are so-called metalloid elements, was limited to 10% or more and 38% or less because it is virtually difficult to obtain an amorphous material outside of this range. This is because the electromechanical coupling coefficient becomes extremely small and only a brittle material can be obtained, making it impractical. Regarding the relative amounts of Fe, Ni and Co, as shown in Figure 1, the relative amounts of these three elements are Ni,
Both have a large K when Co is below 60% and Fe is above 40%. Among these, when Ni and Co are both about 30% or less, the K value is 0.65 or more, which is superior to conventional materials. As shown in Figure 1, P indicates the Ni content.
A particularly large K value can be obtained when the value of q is 0.03 or more and 0.3 or less, and the value of q, which indicates the Co content, is 0.2 or less. The dependence of the K value on the relative amounts of Fe, No, and Co does not change with the addition of Cr. The present invention will be explained below based on examples. Example 1 (Fe _1-qp Ni _p Co _q ) _100-xy Cr _x M _y Materials with p, q, and y changed as shown below were melted and an amorphous alloy was made using the so-called single roll method. When various properties were investigated, the results shown in Table 1 were obtained. Regarding corrosion resistance, the corrosion loss of the test piece was measured after being immersed in hydrochloric acid with a concentration of 20% for 24 hours, and those with a corrosion loss of 0.04wt% or less were considered to be extremely excellent (◎), and those with a corrosion loss of 0.05~
Those with 0.1wt% were marked as excellent (〇).
Regarding toughness, the breaking strength (Kg/mm ² ) is
A score of 350 or above was considered extremely excellent (◎), and a score of 300 or above but less than 350 was considered excellent (◎). The corrosion resistance and toughness are shown as markedly excellent (◎) or excellent (○).

[Table] In Table 1, #1, #2 and #3 are alloys of examples of the present invention, and #4 and #5 are alloys of comparative examples. As is clear from the results in Table 1, the alloy of the present invention has significantly improved corrosion resistance and toughness, which are disadvantages of conventional materials, and also has a large electromechanical coupling coefficient. In addition, in the present alloy, amounts of transition metals other than the main components and Mg, Ca, Zn, Cd, Sr,
When Ba, Se, Te, Al, Ge, N, S, Bi, etc. are contained in a range not exceeding 8%, heat treatment to increase the electromechanical coupling coefficient K becomes easy, and the frequency dependence of K and Bias magnetic field dependence is improved. However, if these amounts exceed 8%, K
It becomes impractical as it deteriorates the Note that amorphous in the present invention refers to macroscopic
This refers to a situation in which no obvious device-like ring is detected by line diffraction, and there is no problem in practical use.

[Brief explanation of the drawing]

FIG. 1 is a curve diagram showing the relationship between the relative amounts of Fe, Ni, and Co and K in the (Fe _1-qp Ni _p Co _q ) ₇₅ Cr ₃ Si ₁₀ B ₁₂ system.

Claims (1)

[Claims] 1. Atomic ratio composition is (Fe _1-pq Ni _p Co _q ) _100-xy Cr _x M _y However, M: one or more selected from Si, B, P and C An amorphous magnetostrictive material characterized by a combination of 0.03p0.3, q0.2 0.05x10, 10y38. 2 Atomic ratio composition is (Fe _1-p Ni _p ) _100-xy Cr _x M _y However, M: one or a combination of two or more selected from Si, B, P and C0.03p0.3 0.05x10 , 10y38.