JPH081528A - Scissors for physics and chemistry and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a physicochemical clamping device having sufficient characteristics by minimizing the amount of expensive Pt or Pt alloy used. [Structure] Pt is formed on at least opposite surfaces of the sandwiching portion 2.
Alternatively, since the surface layer 3 is formed by depositing and depositing a Pt alloy, the surface layer is made of Pt or a Pt alloy having a dense crystallographic structure in the thickness direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sandwiching tool for physics and chemistry, such as tongs and tweezers, which is used for inserting, unloading, and moving a physics and chemistry crucible, an analytical sample, and the like into an electric furnace or a burner furnace. And a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, this type of physics and chemistry clamping device uses a coating or sheath made of Pt or a Pt alloy which is excellent in heat resistance, corrosion resistance and chemical stability in order to prevent contamination of the object to be clamped. (Gripping part) is covered. The coating of the sandwiched portion with the coating sheath is performed by brazing the coating or welding divided sheaths (see Japanese Patent Laid-Open Nos. 3-92284 and 3-92285).

[0003]

However, in the conventional clamping device for physics and chemistry and the manufacturing method thereof, it is desirable to cover the clamping part with the minimum necessary amount of Pt or Pt alloy, but the coating film and the like are produced as separate parts. Therefore, there is a limit in thinness and size. Further, since it is a work of attaching another piece, there are problems that it is difficult to join, peels off, or is not flat. Therefore, the present invention provides a physics and chemistry clamping device having sufficient characteristics with a necessary minimum amount of expensive Pt or Pt alloy, and a method for manufacturing a physics and chemistry clamping device that can be manufactured easily with long life and with high accuracy. The purpose is to provide.

[0004]

In order to solve the above problems, the physicochemical clamping device of the present invention has a surface layer formed by depositing and depositing Pt or a Pt alloy on at least opposite surfaces of the clamping part. It is characterized by The tongue preferably has the sandwiching portion. Moreover, what has the said clamping part may be tweezers. The thickness of the surface layer is preferably 10 to 100 μm.
On the other hand, in the method for manufacturing a physicochemical sandwiching device of the present invention, after forming a base layer by electroless plating on at least opposite surfaces of the sandwiching portion, a surface layer of Pt or Pt alloy is formed by electroplating. Characterize. The underlayer is P
It is preferably t, Ni or Cu.

[0005]

In the physicochemical sandwiching device of the present invention, Pt or Pt whose surface layer has a dense crystallographic structure in the thickness direction.
Become an alloy. If the thickness of the surface layer is less than 10 μm, P
If the characteristics of t or Pt alloy are not effectively exhibited and the thickness exceeds 100 μm, the cost becomes high, and there is no effect commensurate with the thickness, and the formation time becomes long. Further, in the method for manufacturing a physicochemical sandwiching device of the present invention, it becomes easy to form a surface layer having a required thickness, and the adhesion (bonding) strength thereof becomes sufficient.
By using Pt, Ni, or Cu for the underlayer, stable electroplating can be performed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a perspective view of a tongue showing one embodiment of the physicochemical clamping device of the present invention, and an enlarged view of the main part.
The tongue 1 has a surface layer 3 having a thickness of 10 to 100 μm formed by depositing and depositing Pt or a Pt alloy on the surface of the holding portion 2. The Pt or Pt alloy of the surface layer 3 covering the sandwiching portion 2 is
Due to the above deposition and deposition, it has a dense crystallographic structure in the thickness direction. Here, when the thickness of the surface layer 3 is less than 10 μm, the characteristics of Pt or Pt alloy are not fully exhibited,
On the other hand, if it exceeds 100 μm, the cost becomes high, the effect commensurate with it is not obtained, and the forming time becomes long.
Therefore, according to the tongs 1 having the above-mentioned configuration, the expensive Pt
Alternatively, the amount of Pt alloy used can be minimized, and the bonding strength can be sufficient and the life can be long.

When the tongue having the above structure is degreased, the tongue made of stainless steel is degreased, the portions other than the sandwiching portion are masked, and the thickness is obtained by electroless plating of Pt, Ni or Cu.
After forming a 0.1 μm underlayer, a 300 μm thick surface layer was formed using the required plating bath (eg Platinate 100 (Pt; 10 g / l): Nippon Electroplating Engineering Co., Ltd.). . The surface layer of the sandwiching portion of the obtained tongs had a Vickers hardness of 300, had no defects such as pinholes and cracks, and exhibited good flatness and appearance. For comparison, when Pt having a thickness of 500 μm was brazed to the opposing surfaces of the sandwiching portion of the tongue, Vickers hardness was 50 and good flatness was not obtained.

Although the tongs have been described in the above embodiments, the same effect can be obtained by applying the present invention to the tweezers. Further, the surface layer is not limited to being formed on the entire surface of the sandwiching portion, but may be formed on at least opposite surfaces that contact the object to be sandwiched.

[0009]

As described above, according to the physicochemical sandwiching device of the present invention, the surface layer is made of Pt or Pt alloy having a dense crystallographic structure in the thickness direction. Thus, the amount of expensive Pt or Pt alloy used can be minimized to provide sufficient characteristics. Further, according to the method for manufacturing a physicochemical sandwiching device, the adhesion (joining) strength of the surface layer becomes sufficient and the required thickness can be easily formed, so that the life can be made longer than in the past, and It can be manufactured accurately and easily.

[Brief description of drawings]

FIG. 1 is a perspective view of a tongue showing an embodiment of a physicochemical clamping device of the present invention.

FIG. 2 is an enlarged view of a main part of the tongue shown in FIG.

[Explanation of symbols]

 1 tongs 2 clamping part 3 surface layer

Claims (6)

[Claims] 1. A P is provided on at least opposite surfaces of the sandwiching portion.
A physicochemical sandwiching device having a surface layer formed by depositing and depositing t or Pt alloy. 2. The clamping device for physics and chemistry according to claim 1, wherein the one having the clamping portion is a tongue. 3. The physicochemical clamping device according to claim 1, wherein the one having the clamping part is tweezers. 4. The clamping device for physics and chemistry according to claim 1, 2 or 3, wherein the surface layer has a thickness of 10 to 100 μm. 5. A method of manufacturing a physicochemical sandwiching device, which comprises forming a base layer by electroless plating on at least opposing surfaces of the sandwiching portion, and then forming a surface layer of Pt or Pt alloy by electroplating. . 6. The method of manufacturing a physicochemical sandwiching device according to claim 5, wherein the underlayer is Pt, Ni or Cu.