JPH07122124B2 - Method for forming red spray coating - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for obtaining a wear-resistant red thermal spray coating, which is useful for providing exhibits, building materials, figurines, etc., which are decorated with a reddish purple colored coating. The present invention relates to a method for forming a wear-resistant reddish purple sprayed coating.

[0002]

2. Description of the Related Art With the recent trend of nature-oriented movements, in addition to the fields of exhibits, building materials, figurines, etc., but also in the field of general industrial materials, the inorganic nature of the material itself The cold appearance is colored by various surface treatment methods or the like to give a decorative effect. Among them, as one method, a method of forming a colored film by thermal spraying is performed and is applied to outdoor structures, outer walls of buildings, and the like.

At present, various thermal spraying powders used for carrying out such a method are commercially available, and thermal spraying using these powders produces coatings of various colors. That is, metal-based powders produce metallic colors, and ceramics produce blue-based, green-based, brown-based, white, black, and the like. However, a red film, which is one of the three primary colors, has not yet been obtained, and its development is awaited for the diversification of display colors. Furthermore, it has been desired to provide a ceramic reddish purple film that is neither rust-proof nor fading.

[0004]

As a result of intensive research to solve the above problems, the present inventor succeeded in obtaining a red thermal spray coating having excellent wear resistance and no fading. That is, the present invention provides (1) a method of forming a reddish purple sprayed coating by performing thermal spraying using a thermal spraying powder composed of a composite of alumina and gold, (2) a composite as a thermal spraying powder,
A method of forming a reddish purple sprayed coating according to the above-mentioned item 1, characterized in that the surface of the alumina powder particles is coated with a gold coating, (3) the spraying is plasma spraying A method of forming a reddish purple sprayed coating according to claim 1 or 2, (4) wherein the gold in the composite of alumina and gold is 0.5 to 2.0%. The method for forming a reddish purple sprayed coating according to any one of items 1 to 4, and (5) the composite contains a vitrifying component, which is any one of items 1 to 4. The method for forming a reddish purple sprayed coating as described in 1.

[Detailed Description of the Invention] In the present invention, the alumina powder conventionally used as the thermal spraying powder is
By performing plasma spraying by using a composite material obtained by depositing gold as a composite powder for thermal spraying, a high temperature plasma flame melts the sprayed powder in an instant, and Au-purple Au is produced.
It is considered that a ceramic-based sprayed coating including an intermetallic compound of -Al is produced. The reddish purple ceramic-based sprayed coating is produced with stable color reproducibility. In the present invention, it is preferable to use alumina or an alumina-containing composition as the thermal spray powder base material, and it is preferable to use gold or a gold alloy as the material to be composited with it. By spraying a composite of these combinations as a thermal spray powder, a red thermal spray coating is formed. Although the chemical composition of the film has not been clarified, it is considered that an Al-Au intermetallic compound is generated and contributes greatly to the red color development. However, since the amount of gold deposited on the sprayed powder in the present invention is extremely small, it cannot be considered that it is only the color of the Al-Au intermetallic compound, and some other red coloring composition is produced. It is thought that it is doing. It is not clear whether it contains only intermetallic compounds or those containing Al-Au oxides.

Since a high temperature of 2000 ° C. or higher can be obtained by thermal spraying, it is considered that the composite of alumina and gold undergoes a chemical reaction in an ionic state, which results in the formation of Al—Au intermetallic compounds and Al—Au. Formation of an oxide-based composition is considered. In any case, it is presumed that the reddish color development involves a small amount of Au compound. The reason for this is that the red thermal spray coating is not formed even when thermal spraying is performed using a thermal spraying powder in which a metal other than gold is mixed with alumina particles. Various types of thermal spraying can be adopted. That is, an electric spray method, a flame spray method of gas spray, or the like can be adopted.

The thermal spraying powder according to the present invention is preferably a composite such as gold-coated alumina, but if both can be supplied so that both the alumina particles and the gold particles can be brought into even contact with each other during thermal spraying, both of them can be supplied. It does not have to be a bonded composite, for example a simple mixture. Furthermore, by adding a vitrifying component to the composite, gloss is added to the film and a more bright red color is developed. As the vitrifying component, those having a relatively high melting point and transparency are preferable, and quartz powder is preferable. It is also possible to use, for example, feldspar having low transparency.

[0008]

EXAMPLES Examples of the present invention will be described below. [Example 1] Plasma spraying was performed at a power of 35 KW on the surface of a mild steel material by using a gold composite alumina particle powder in which 1% by weight of gold was coated on the surface of alumina oxide particles having an average particle diameter of 10 to 20 microns. However, a ume rat-colored film containing an Au-Al compound was formed. The implementation conditions are as follows. ． Pretreatment = Substrate (blast) treatment Blast machine used: "Ascon Blast Machine BA-2 type (direct pressure type)" (manufactured by Atsuko Tekko Co., Ltd.) Blast material: Alumina particles (particle size: # 60) Injection time: 70 seconds ． Thermal spraying equipment Plasma spraying gun: "9MB type plasma spraying gun" (manufactured by Daiichi Meteco Co., Ltd.) Powder supply equipment: Fluidized bed type LPC-4MP. Thermal spraying conditions Plasma gas: Argon + hydrogen (10%) mixed gas Thermal spraying atmosphere: Air Thermal spraying distance: 100 mm Thermal spraying powder: Gold-coated alumina particle powder (alumina 10-20)
μm, gold coating amount 1w%) Material to be sprayed: Mild steel material of 50 × 60 × 3.2 mm

Further, the color species of the plasma spray coating carried out under the above conditions is 5R with a standard color chart in accordance with JIS Z8721.
It was equivalent to PV5 / 4C and had a plum mouse color (a grayish pinkish color). Furthermore, the result of the abrasion resistance test of the same coating shows that the abrasion loss is 65.
7 (mg / 30 cm ² / alumina blast material injection amount: 7
It was 0 g). However, the measuring device used was an "ACT-JP tester" (manufactured by Takahashi Engineering Co., Ltd.).

[Example 2] Gold composite alumina particle powder in which 1% by weight of gold was coated on the surface of alumina oxide particles having an average particle size of 10 to 20 microns, and silica particle powder under a 200 mesh (74 µm or less) sieve. Plasma spraying was performed on the surface of mild steel with an output of 35 KW using a sprayed powder in which the body was mixed at a weight ratio of 1: 1. As a result, a strong reddish garnet color containing an Au-Al compound (JIS Z8721 standard color chart 5R
A film of V3 / 6C) was formed. The conditions for implementation were the same as in Example 1 above. Further, the wear resistance of the formed film was almost the same as that in the case of Example 1.

[0011]

As described above, according to the present invention, it is possible to easily form a stable, abrasion-resistant and red-colored (Meizumi color) thermal spray coating. Further, the thermal spraying powder used in the method of the present invention contains gold in an amount of 5% or less, preferably 0.5 to
Since a small amount of 2.0% is sufficient, the manufacturing cost can be significantly reduced. In the past, it was not possible to form a stable reddish film by thermal spraying, but since this is made possible by the present invention, it can be used not only on the surface of exhibits, building materials, figurines, etc., but also for general industrial materials. A red-colored thermal spray coating can be formed on the surface as well to impart decorativeness.

Claims (5)

[Claims] 1. A method for forming a magenta sprayed coating by performing thermal spraying using a thermal spraying powder composed of a composite of alumina and gold. 2. The method for forming a reddish purple sprayed coating according to claim 1, wherein the composite as the spraying powder is obtained by coating the surface of the alumina powder particles with a gold coating. 3. The method for forming a reddish purple sprayed coating according to claim 1, wherein the spraying is plasma spraying. 4. The gold in the composite of alumina and gold is less than 0.
5 to 2.0%, characterized in that
The method for forming the reddish purple sprayed coating according to any one of 1. 5. The method for forming a reddish purple sprayed coating according to claim 1, wherein the composite contains a vitrifying component.