JPS59140363A - External parts for pocket watch - Google Patents

Abstract

PURPOSE:To obtain external parts for a pocket watch with wear resistance, high corrosion resistance and easy cleanability by plasma-spraying a wear-resistant metallic compound on the surface of a base metal and by forming a film on the sprayed layer by coating. CONSTITUTION:Wear resistant powder of a metallic oxide such as Al2O3 or TiO2, a metallic carbide such as WC or TiC, or a metallic nitride such as TiN or CrN mixed with an iron group metal is plasma-sprayed on the surface of the base metal of each of external parts for a pocket watch to form a ceramic film. A resin or inorg. material film is then formed on the surface of the sprayed layer by coating. For example, epoxy paint is mixed with a pigment or dye and further mixed with ''Teflon'' resin to prepare a coating material for said coating. Thus, colored hard films with high corrosion resistance and wear resistance are formed on the surfaces of the external parts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to surface treatment of exterior parts for a portable watch, particularly the body, glass rim, crown, band, and the like.

In general, surface treatments for exterior parts for mobile watches can be roughly divided into plating, painting, etching, etc. However, when stainless steel or copper alloys such as brass are used as the fabric material, there are problems in terms of wear resistance. In addition, the expression of color tone was also limited. In other words, in terms of abrasion resistance, the fabric is easily exposed due to scratches and abrasion during normal carrying. Regarding color tone, plating can only express gold or silver colors, and painting can express various colors, but it is significantly inferior in terms of abrasion resistance. Plasma spraying is widely known as a method for coating metals, alloys, or ceramics to impart wear resistance and heat resistance to the surface of metal materials.
Since there are many holes, many of which penetrate from the surface to the base material, their use as exterior parts for watches is extremely poor in corrosion resistance, so their use has been restricted.

For X invention! Ru. ! :,At,O,,E3i0. , Ti0
,． By plasma spraying powder mainly composed of ceramic powder such as 2τ03, it is possible to produce colors such as black, white, green, blue, brown, etc., and by mixing pigments of the same color tone on top of it, tare 0 / series By applying a coating film of this paint to the bottom of the tank, we were able to create a color film that has high corrosion resistance and does not damage the hardness of the base, that is, the sprayed film. In our experiments, the roughness of the sprayed surface was 2 in terms of centerline surface roughness [RG].
When the thickness was between μ and 5μ, the adhesion with the Teflon paint was optimal and the appearance of the coating film was also optimal. Furthermore, coating thickness of Teflon paint material of about 5 μm to 15 μm was excellent in terms of wear resistance and corrosion resistance. It has been found that if the thickness of this coating is made thin, the corrosion resistance will be poor, and if it is made thick, the Teflon paint itself will be easily scratched because it is soft, although it has a low coefficient of friction of about 0.02. If the Teflon coating thickness is within the above range of 5μ to 15μ,
It was also found that the Teflon coach-in film itself was less likely to be scratched, without compromising the hardness of the sprayed film, and because it serves as a backup for the sprayed film.

Examples of the present invention will be introduced below.

(Example 1) When the body of a portable watch is coated with a powder mixture of A7., Oa and T701i in a ratio of 6:4, the particle size is crushed to less than mμ and plasma sprayed to a thickness of 100μ on the surface of the watch. , a black ceramic coating is obtained.The reason why the particle size of the sprayed powder is adjusted to 4μ or less is that the centerline surface roughness [Rα] of the sprayed film is within the range of 2μ to 5μ. I'm there to do it.

After that, Teflon paint mixed with carbon black is applied to the sprayed film to a thickness of 10 μm. Through the above process, a black hard coating with high corrosion resistance and wear resistance was obtained.
c 0 (Example 2) 99.1% pure At, O on the body or band of a mobile watch
, is crushed to a particle size of around 15μ and sieved, and the powder is plasma sprayed onto the surface of the body or band of the mobile watch with a target of 100μ on the body and Iμ on the first band. A white ceramic film is obtained. The roughness of the sprayed film surface was measured, and the center line surface roughness Ra,
) is polished or ground to around 3μ.

The reason why the ceramic powder was sieved through a 15μ sieve was to aim for a surface roughness i RCL = around 3μ after thermal spraying. Then, by applying Teflon paint mixed with rutile-based titanium to a thickness of 10 μm on the sprayed coating, a watch body and band with excellent abrasion resistance and high corrosion resistance can be obtained. Another advantage of the coating film is that with thermal sprayed coatings, the surface is rough and active, so it is difficult to remove dirt if a dirt spoon gets stuck to it, but with Teflon coating, even if dirt gets stuck, it is difficult to remove. It can be easily removed with poppy rubber or household neutral detergent.

In addition, instead of the white Teflon coating, bodies and bands in various colors can be obtained by coating pale colors such as blue, red, and yellow on top of the white sprayed NFC coating.
In this case, even if the surface is scratched by something, the paint in the valleys of the sprayed film will never be completely fooled, and if only the peaks are exposed, it will not be white. No thermal spray film was visible.

As is clear from the above description of the embodiments, according to the present invention, a hard color coating that has wear resistance, high corrosion resistance, and is easy to remove dirt can be obtained.This effect is significant. .

that's all

Claims (4)

[Claims] (1) An exterior part for a portable watch, characterized in that wear-resistant powder is plasma sprayed on the surface of a base metal, and a coating of resin or inorganic material is provided on the surface of the sprayed layer. (2) Az, oa, s(
0,,Tie,,ZrO,,Ha,o,Or,0,,O
aO,? 6. Metal oxide materials such as O,,v,o, or WO, T2C,'r50. Carbide of group 4.5.6 of the periodic table such as s40, OT, O, or Tin, Or
Nitrides of group 4.5.6 of the periodic table such as N, TaN, VIH, iron group metals such as Fg, N4,00, Of, MQ
The exterior part for a portable watch according to claim 1, characterized in that it contains a powder V selected from one or more of the powders mixed with metals such as V. (3) The surface of the sprayed layer is plasma-sprayed with the above-mentioned wear-resistant powder by adjusting the particle size of the powder, or by grinding or polishing the surface after thermal spraying, so that the surface roughness of the sprayed layer is adjusted to the center-average roughness. 3. The exterior component for a portable watch according to claim 1, wherein the length [RcL] is within the range of 2μ to 5μ. (4) A mobile watch according to any one of claims 1 to 3, characterized in that the coating film is a mixture of an epoxy paint with a pigment or a dye, and then a Teflon resin mixed with the paint. Exterior parts.