JPS5866083A - Cace of watch - Google Patents

Abstract

PURPOSE:To provide the case for a golden watch inexpensively by forming a titanium nitride film on a base material by ion plating at a thickness of less than 1mum after the titanium is attached thereto by ion plating at a thickness of more than 0.5mum. CONSTITUTION:Titanium is attached to the purified case for a stainless steel watch at a thickness of 1mum by ion plating with an evaporation source 4, a probe electrode 6 and an acceleration power source 8. Then, a nitrogen gas is introduced by a gas introduction system 7 and a golden titanium nitride film is formed at a thickness of less than 1mum by ion plating.

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to improve the corrosion resistance of a golden titanium nitride coating formed by an ion blating method.

Traditionally, mobile watches have had strong decorative elements, and their commercial value has been influenced by the appearance of their exterior parts.Also, due to the harsh conditions of use, their exterior parts have been known to have excellent corrosion and abrasion resistance. considered to be a necessary condition. In this respect, the °
Golden titanium nitride has attracted attention in recent years as a decorative material because of its good physical and chemical properties such as hardness, single-tone gloss, and chemical resistance, as well as its low processing costs.

Titanium nitride produced by the ion blating method is being used as a surface treatment for stainless steel, carbide, hard sintered materials, and copper alloy capes coated with nickel plating, etc. However, titanium nitride itself is extremely difficult to use. Despite its good corrosion resistance, due to poor adhesion to the base metal, corrosion caused by small pinholes in the coating often causes the coating to peel off, causing corrosion to spread throughout the coating. It was. One of the reasons why titanium nitride has poor adhesion to materials is that the titanium nitride coating has extremely high stress. Specifically, it has a value of 1010 to 10" dyn, i, depending on the method of creating the film. This value is higher than the value of general wet plating (10'
ayn/al1 unit) This is a very generous value compared to K. This stress causes deformation of the culm, which causes problems in both physical and mechanical precision when titanium nitride is attached to a soft material such as brass to a thickness of 1 μm or more. On the other hand, since the titanium nitride coating cannot completely cover a material with a thickness of 1 μm or less, it is not practical to improve corrosion resistance. In addition, this stress does not deform materials such as stainless steel, which have a hardness of more than a certain degree, but if a dimpled layer of 1 μm or more is attached, the coating will not be able to withstand the stress, and the coating will form. Peeling on the ridge,
Alternatively, peeling occurred during the progress of corrosion from pinholes.

As mentioned above, a titanium-covered midfielder! The stress was so great that practical problems remained. On the other hand, stainless steel coated with titanium of 0.5 μm or more by ion blasting, nickel-plated copper alloy, etc. show extremely good corrosion resistance, and this titanium coating only has stress that does not cause any practical problems. The present inventors have confirmed that the adhesion is good and the adhesion is good.

The present invention takes advantage of the fact that ion-bladed titanium has extremely low stress as described above and has excellent corrosion resistance and adhesion. ! The aim is to widely use titanium nitride coatings, which have excellent decorative properties, in exterior parts for mobile watches. That is, firstly, titanium is attached to the material by ion-blating to a thickness of 05 μm or more, which is necessary for corrosion resistance, and then a titanium nitride film of 1 μm or less, which contains JiIt, which does not cause problems due to stress, is formed by ion-blating. The present invention provides an exterior part for a portable watch having a titanium nitride coating with excellent properties.

Example 1 The figure shows an example of an ion brating device for providing the exterior part for a portable watch of the present invention.

First, the vacuum chamber 1 is evacuated by the exhaust system 2, and then the stainless steel portable watch exterior part 5 is heated to 200° C. by the heater 3. Next, add gas to the gas introduction system 7.
X 10 = Torr is introduced, and ion bombardment is performed using the acceleration power source 8 to clean the exterior parts of the stainless steel portable watch. Next, using the evaporation source 4, the probe electrode 6, and the speeding power source 8, ion blating was performed on titanium at a biofilm velocity of 0.1^m/9r for 10 minutes, and then nitrogen gas was introduced using the gas introduction system 7. When 5X10'Torr was introduced and ion blating was performed for 5 minutes at the same biofilm speed, the stainless steel mobile watch parts that were the substrate turned gold, and the exterior parts passed the artificial sweat immersion test for 96 hours and the salt water spray test for 96 hours. It also withstood a heat shock test in which it was rapidly cooled from 40°C with water at room temperature, and did not produce any carp growth.

Example 2 Using the same equipment as in Example 1 and using brass as the object to be treated, Example 1
Ion blating titanium for 20 minutes and titanium nitride for 5 minutes under the same conditions.

The exterior parts of the brass mobile watch showed no deformation or peeling and had a golden color. The part passed artificial sweat immersion test 96 hours flf
i. Salt spray test 96 hours KI14 had no problems at all.

In the examples, stainless steel and brass exterior parts for portable watches were used as the processed materials, but the present invention may be applied to copper alloys such as nickel silver, sintered materials, and all general exterior base materials.

As described above, the present invention provides inexpensive KI exterior parts for gold-colored mobile watches without using expensive gold plating! made it possible to provide Furthermore, it is clear that the present invention is applicable not only to exterior parts for portable watches, but also to general gold decorative parts.

[Brief explanation of the drawing]

The figure is a sectional view of an ion brating device for providing an exterior part for a portable watch according to the present invention. 1...Vacuum chamber 5...Exterior parts for mobile watch 2...Block exhaust system 6...Probe TW
5... Heater 7... Medium gas introduction system 4
...Evaporation source 8...More than the music accelerating power source Dai-ni Seikosha Co., Ltd.

Claims (1)

[Claims] Materials made of metal or alloys! ! In creating a golden titanium nitride film on a surface by an ion-blating method, the relationship between the material and the titanium nitride film [having a metallic titanium layer of 05 μm or more and having a titanium nitride film layer of 1 μm
An exterior part for a mobile watch characterized by the following: