JPS60181263A - External parts for watch - Google Patents

Abstract

PURPOSE:To obtain a golden alloy having superior corrosion and wear resistances and suitable for use as the material of external parts for a watch by adding a specified amount of Al to Ni. CONSTITUTION:A thin film having superior corrosion and wear resistances is formed on a stainless steel watchcase by high frequency sputtering, vacuum deposition, ion plating or other method using an Ni-Al alloy contg. 20-30wt% Al. At this time, oxygen and/or hydrocarbon such as acetylene is introduced into an apparatus for said method, and by regulating the kind and amount of the gas introduced, the color tone of the thin alloy film can be widely changed from light gold color to reddish or pinkish gold color.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to exterior parts for watches, such as watch cases, cases, and bands, which are golden in color and have excellent corrosion resistance and wear resistance. .

(Prior art) Traditionally, the exterior parts of watches that have a golden tone without using expensive precious metals have been made using (1) titanium nitride, (2) golden alumite, and (3) golden paint. However, the gold color of this metal is not necessarily a desirable gold color, and its corrosion and abrasion resistance are not sufficient, so it has not been widely accepted as a substitute for gold.

(Object of the Invention) The present invention aims to eliminate the above-mentioned drawbacks and to provide an exterior part for a watch that is inexpensive and coated with a gold-colored alloy thin film having corrosion resistance, wear resistance, and abrasion resistance.

(Structure and composition of the invention) The N@-A1 alloy originally appeared in gold color in 1983
-181354 is known as a sintered alloy. However, the above-mentioned sintered alloy exhibits a pale gold color, and it has not yet been possible to obtain a wide range of color tones such as pure gold gold and pink.

The present invention relates to the above-mentioned N6-A1 alloy. By coating the exterior parts of watches with W film, we have made it possible to freely obtain a wide variety of gold tones.

The reason for limiting the component composition of the present invention is that the At content is
If it is less than 30%, the desired product hardness and high corrosion resistance cannot be ensured, and if it exceeds 30%, the color tone will be affected.

The method of manufacturing the alloy thin film of the present invention and coating it on the exterior parts of a watch is to form an alloy thin film on the exterior part by a physical vapor deposition method such as Shinkyo vapor deposition method or Subacling ion blating. At that time, one or both of oxygen and a hydrocarbon such as acetylene is introduced into the device, and one or both of oxygen and carbon is contained in the alloy to adjust the color tone. do.

Next, a detailed explanation will be given based on examples.

Example 2 An alloy having a composition of 5% At and remaining N6 was processed into a disk shape and used as a target for a Nubatter device. Next, a Nutenless steel watch case was attached to the substrate side along with this target and high frequency sputtering was performed. During the process, it was discovered that when oxygen and acetylene were introduced as reaction gases, the color tone could be freely changed to pale gold, reddish gold, pink, etc., depending on the type of gas and the amount introduced.

The following tests were conducted on a watch case with a 1.0 μm thickness of Nuvatsutar film, and excellent results were obtained in all cases. That is, (1) Corrosion resistance test, salt spray test 3 cycles passed (2) Erichsen cowhide abrasion test, 18 with gold plating
/7 wear amount (3) Case bending test 1. There was no peeling of the film.

Although the sputtering method was used as the method for forming the thin film in the above embodiments, it is of course possible to use the vacuum evaporation method or the ion brazing method, which is particularly advantageous in a reactive ion blating device into which a reactive gas can be introduced.

(Effects) As detailed above, when the gold thin film of the present invention is coated on the exterior parts of a watch, each mild golden color tone can be freely selected. It can be said that it was invented.

This has made it possible to manufacture watch exteriors that retain their desirable golden color over a long period of time.

that's all Applicant: Seiko Electronics Industries Co., Ltd. Agent Patent Attorney Mogami

Claims (1)

[Claims] An alloy containing 20 to 30 weight q6 of A/, with the remainder consisting of Ni and unavoidable impurities? An exterior part for a watch characterized by forming a g-film.