JPS6013541A - Ornamental part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to decorative parts based on aluminum;
More specifically, the present invention relates to a decorative component having a coating layer with excellent scratch resistance.

[Technical background of the invention and its problems]

Many of the decorative parts manufactured industrially are constructed by coating the surface of a metal base material with a beautiful and useful layer.

One of the important characteristics required for these decorative parts is
It is said that the coating layer has excellent scratch resistance.

This means that it is hard to get hurt.

For this reason, in recent years, various hard and wear-resistant ceramic materials have been coated directly onto the surface of the base material in an extremely thin layer (of the order of several μm). In this case, the coating method must be able to form a coating layer with a dense structure and excellent wear resistance, have excellent adhesion between the coating layer and the surface of the base material, and be relatively easy to form a film. , due to reasons such as physical chemical vapor deposition (PCVD).
law) is widely applied. This method uses the same source gas as the CVD method;
While the method is based on a thermal method in the atmosphere, this method is characterized by the use of discharge in a low-pressure ambient atmosphere, and is an intermediate method between CVD and PVD.

By the way, metal aluminum is commonly used as a base material for decorative parts. However, when attempting to apply the above-mentioned PCVD method to aluminum to form a beautiful and wear-resistant ceramic coating layer, the corrosion of the corrosive gases (e.g., HCl, C12) produced by this process causes the aluminum The surface of the will turn black,
The fact that it is visible through the thin coating layer greatly impairs the aesthetic appearance. This is a fatal problem for decorative parts, and since aluminum is an extremely soft metal (Hv = about 6 layers), if an abnormal external force is applied from above the coating layer, that part will cave in. In the end, it manifests as trauma. This means that it has poor scratch resistance.

[Purpose of the invention]

The object of the present invention is to eliminate all of the above-mentioned drawbacks of decorative parts based on metallic aluminum, and to provide a decorative part that does not impair its aesthetic appearance and has excellent abrasion resistance.

An intermediate layer formed by subjecting the surface of the base material to alumite treatment or boehmite treatment, and a group IVa or VC group of the periodic table formed by covering the surface of the intermediate layer.

■Nitrides and carbides of elements belonging to group a.

It is characterized by consisting of any layer of boride; any layer of silicon, boron nitride, or carbide; or a composite layer thereof.

The decorative component of the present invention is composed of three layers, which will be described later.

First, the base material is a metal aluminum having a hardness (Witzkers hardness: HV) of about 50 to 70.

The second layer is an intermediate layer formed by curing the surface of the base material. As a hardening method, commonly used boehmite treatment or alumite treatment is applied. At this time, the hardness of the intermediate layer is Hv
It increases to about 100-500.

Further, the thickness of the intermediate layer should normally be 3 μm or more from the surface. If it is thinner than 3 μm, the effect as a hardened intermediate layer will not be exhibited.

The third layer is a ceramic coating layer formed on the intermediate layer.

The ceramics used are group IVa of the periodic table.

A nitride, carbide, or boride of any element belonging to the VC group or the a group, or a nitride of 5IIB.

Either carbide or a composite of these.

Examples of nitrides include titanium nitride (TtN), zirconium nitride (ZrN), and nophnium nitride (HfN).
).

Vanadium nitride (VN'), niobium nitride (NbN),
Tantalum nitride (TaN) Chromium nitride (CrN +
Cr2N ) + molybdenum nitride (MO2NIMON)
l Tungsten nitride (WAN, WN2 + W2
N3) + silicon nitride (S i 5N4).

Boron nitride (BN) is mentioned; carbides include titanium carbide (TiC), zirconium carbide (ZrC), hafnium carbide (HfC), sodium carbide (VC),
Niobium carbide (NbC), tantalum carbide (TaC), chromium carbide (Cr5CB I CryC3, Cr23Cs
) + Molybdenum carbide (Mo2C+ Mo C) +
Tungstea carbide (W, CI'Wc) 1 Silicon carbide (SiC), boron carbide (BN); examples of borides include titanium boride (Ti&), zirconium boride (Zr&) + hafnium boride (Hflh) .

Vanadium boride (V&), niobium boride ([bB.

Nb5B<, NbBz), tantalum boride (T
a2B, TaB.

'pa3B4) + chromium boride (Cr5Bz, C
rB ), molybdenum boride (Mat B + Mo
B r MO2B+! ) + tungsten boride (
W2 B , WB , W2 B s ) are opened. Among these ceramics, nitrides are preferred because the coating layer can be formed relatively easily and they are easily available. Particularly preferred is TiN.

This ceramic coating layer is formed by applying the above-mentioned PCVD method. At this time, corrosive gases such as hydrochloric acid gas are generated as by-products, but since the aluminum base material is protected by a corrosion-resistant intermediate layer such as an alumite layer or a boehmite layer, it is corroded by these corrosive gases. There isn't.

At this time, the alumite layer is more preferable between the alumite layer and the boehmite layer. Therefore, the aesthetic appearance of the obtained three-layer structure is not impaired.

[Embodiments of the invention]

Hv with dimensions and shape of 15 m in length, 15 m in width, and 15 strips in thickness.
The surface of the aluminum specimen No. 60 was subjected to boehmite treatment and alumite treatment under the following conditions to completely form an intermediate layer.

Boehmite place [: 5.2? The specimen was placed in a mixture of 0.1 f/l of triethanolamine, 0.1 f/l of citric acid, and 0.3 f/l of propylene diamine and boiled for 30 minutes.

The specimen is used as an anode in the bath, and the bath temperature is 20℃, current density IA/dm2 was anodized for 60 minutes.

The thickness of the intermediate layer was 6 μm when treated with boehmite and 20 μm when treated with alumite.

After measuring H and v of the formed intermediate layer, each ceramic coating layer was formed by applying the PCVD method under the conditions shown in the table. The thickness of each coating layer was approximately 2 μm.

Each specimen obtained had a beautiful surface.

The abrasion resistance of each specimen was evaluated by applying a sand drop abrasion test specified in JIS H8682.

In the table that shows the above results all at once, ◎: Excellent, ○:
represents good.

〔Effect of the invention〕

As is clear from the above description, the decorative component of the present invention has a beautiful outer surface and excellent scratch resistance, making it useful.

Claims (1)

[Claims] 1. A base material of aluminum or aluminum alloy, an intermediate layer formed by subjecting the surface of the base material to alumite treatment or boehmite treatment, and a periodicity formed by coating the surface of the intermediate layer. A layer of nitride, carbide, or boride of an element belonging to group IVa, group va, or group a of the Table of Laws; a layer of nitride or carbide of silicon or boron; or a composite thereof A decorative component characterized by consisting of a layer of. 2. The decorative component according to claim 1, wherein the coating layer is formed by a PCVD method.