Seiko Instruments Inc

Tohoku University

Takuma Otomo

Ryo Sugawara

Tomoo Kobayashi

Yasunori Akasaka

Akihiko Chiba

Keita Naito

An object of the present invention is to provide a metal elastic element which is suitable for sensing or the like of a fluid pressure change and exhibits favorable resilience even in the case of receiving a sudden pressure change, and also provide a diaphragm using the same. A metal elastic element of the present invention is composed of a two-phase stainless steel having a &#x3b3;-phase and an &#x3b1;-phase, wherein the area ratio of the &#x3b3;-phase is 40% or less, and the two-phase structure is a marble-like metal structure. In the invention, it is preferred that the element has a fiber texture in which &#x3c;111&#x3e;&#x3b3; and &#x3c;110&#x3e;&#x3b1; are preferentially oriented parallel to the thickness direction.

Metal elastic element and diaphragm using the same

Provided is a Co&#x2014;Ni-based alloy in which a crystal is easily controlled, a method of controlling a crystal of a Co&#x2014;Ni-based alloy, a method of producing a Co&#x2014;Ni-based alloy, and a Co&#x2014;Ni-based alloy having controlled crystallinity. The Co&#x2014;Ni-based alloy includes Co, Ni, Cr, and Mo, in which the Co&#x2014;Ni-based alloy has a crystal texture in which a Goss orientation is a main orientation. The Co&#x2014;Ni-based alloy preferably has a composition including, in terms of mass ratio: 28 to 42% of Co, 10 to 27% of Cr, 3 to 12% of Mo, 15 to 40% of Ni, 0.1 to 1% of Ti, 1.5% or less of Mn, 0.1 to 26% of Fe, 0.1% or less of C, and an inevitable impurity; and at least one kind selected from the group consisting of 3% or less of Nb, 5% or less of W, 0.5% or less of Al, 0.1% or less of Zr, and 0.01% or less of B.

Method of producing Co&#x2014;Ni-based alloy

It is an object of the present invention to provide a metal diaphragm capable of achieving a higher strength, excellent corrosion resistance, and a smooth surface condition, and a pressure sensor including the diaphragm. The diaphragm according to the present invention includes a two-phase stainless steel having a composition of 24 to 26 mass % Cr, 2.5 to 3.5 mass % Mo, 5.5 to 7.5 mass % Ni, 0.03 mass % or less C, 0.08 to 0.3 mass % N, and the balance Fe and inevitable impurities, and having a 0.2% proof stress of 1300 MPa or higher.

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Chiba, Japan

Takuma Otomo