JPH0238144B2 - YOSHAZAI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Subject of the Invention) The present invention relates to a thermal spray material, and particularly to a stable colored thermal spray material that is corrosion resistant, wear resistant, and resistant to discoloration and fading.

(Prior Art) The enamel method is known as a technique for coloring and coating the surface of a base material. The enameling method has the disadvantage that it cannot be applied to concrete, wood, etc. because it heats the base material.

Thermal spraying is a technique to improve this drawback.
Thermal spraying has the advantage that not only can the surface of the substrate be coated without changing the properties of the substrate, but also heat resistance, corrosion resistance, and abrasion resistance can be imparted to the coating by using ceramics as the thermal spraying material.

Currently, there are very few thermal spray coating materials that have the above-mentioned functions and also have decorative properties that add beauty. For example, Al ₂ O ₃・TiO ₂ which exhibits black color
Al ₂ O ₃ , Al ₂ O ₃・CoO exhibiting cobalt blue color
An equal number of examples can be cited.

The reason why there is so little colored thermal spray material is due to the fact that the color tone of the thermal spray material before and after thermal spraying is not necessarily the same. In particular, when performing ceramic spraying using the plasma method, plasma is generated in a reducing atmosphere.
It is thought that the overall color tone of the ceramic coating after thermal spraying becomes different from the color tone of the ceramic coating before thermal spraying because there are more oxygen vacancies than in a normal crystal lattice state and this causes color absorption. Therefore, it is extremely difficult to predict the color tone obtained as a result of thermal spraying from the apparent color tone of the thermal spraying material before thermal spraying, and it is often unknown until thermal spraying is actually performed.

However, when performing thermal spraying, it is important to predict the color tone of the thermal spray coating before thermal spraying and to develop a thermal spray material that matches the desired color tone.

(Object of the Invention) In view of the problems of thermal spraying technology as described above, the present invention provides a thermal spraying material that does not damage the substrate to be thermally sprayed, has corrosion resistance and wear resistance, and can adjust the color of the thermal spray coating.
The object of the present invention is to provide a thermal spray coating material that develops an ocher color, which is particularly desired for building materials.

(Structure of the Invention) The thermal spray material of the present invention has a compounding ratio of 1 to 20% by weight of copper oxide (CuO) and 5 to 40% by weight of zinc oxide (ZnO).
% by weight, and a thermal spray material consisting of 40-94% by weight of alumina (Al ₂ O ₃ ).

It is well known that each metal oxide generally has a unique color. For example, beryllium oxide BeO itself is white;
When a compound is made with Al ₂ O ₃ , SiO _{2 ,} etc., for example, 3BeO.Al _{2 O} 3.6SiO ₂ , which has the composition of beryl, exhibits the pale green color of beryl. In addition, MnO itself exhibits a green color, which is similar to CaO.
It also appears green when it forms a compound with SiO ₂ etc.
Saphire, known as a natural and artificial gemstone,
Ruby, spinel, quartz, amethyst, etc. are all due to the unique coloring of the metal oxides that are their compositional components.

However, thermal spray materials are generally sprayed at high temperatures. Moreover, the thermal spray material is one or a mixture or compound of two or more metal oxides.
When these are subjected to high-temperature spraying, for example plasma spraying, as mentioned above, some of the compositions are affected by some discoloration such as oxidation, reduction, compounding, phase transformation, etc. at the high temperature of the plasma, so it is necessary to spray them before spraying. The color tone of the material after it has been sprayed is not necessarily the same as the color tone before it was sprayed. Therefore, in the case of spraying a colored thermal spray material onto a base material to be thermally sprayed, it is extremely difficult to predict in advance the color development of the thermal spray coating on the finished surface.

The present invention solves such difficulties and makes it possible to predict the coated surface color tone after thermal spraying in advance by specifying the composition of the ocher-based thermal spray material.

This thermal spraying material is intended to provide a decorative effect that gives a beautiful appearance to objects to be thermally sprayed, especially buildings made of wood, concrete, etc. Therefore, it is often applied to areas where heat resistance is not particularly an issue. for that
It enables the addition of ZnO, the amount of which is
A wide range of 5 to 40% by weight is possible. ZnO
The addition of CuO has the effect of deepening the coloration of CuO, and the ocher concentration is directly proportional to the amount of ZnO added in the range of 5 to 40% by weight of ZnO. Since no conventional thermal spraying material contains ZnO, the thermal spraying material of the present invention is considered to have a novel composition.

The composition of CuO is limited to 1-20% by weight, and
The reason why the composition of ZnO is limited to 5 to 40% by weight is that in areas outside the above-mentioned limited value ranges, the desired aesthetic appearance cannot be obtained. CuO
By adjusting ZnO and ZnO within the above ranges, the ocher concentration in the coating coloring after thermal spraying can be adjusted.

The reason why the Al ₂ O ₃ composition is limited to 40 to 94% by weight is that the roughness and hardness of _the sprayed surface change depending on the change in the _{Al 2 O 3} composition. If it is less than 90% by weight, the hardness will be insufficient, and if it is more than 90% by weight, the desired color will not be obtained.

The thermal spraying material of the present invention has compositional components such as CuO and ZnO.
and Al ₂ O ₃ are mixed as single fine particles, or granules granulated with a primary binder, or composition formula: xCuO・yZnO・
_zAl2O3 (x=1~20, y=5~40, _z =40~94)
It is possible in any of the embodiments of the melt powder represented by.

Example 1 10 parts by weight of CuO powder, 15 parts by weight of ZnO powder, and 100 parts of Al ₂ O ₃ powder, each having a particle size of 50 μm or less
The thermal spray material obtained by uniformly mixing parts by weight is a brownish-gray powder. As a result of plasma spraying this thermal spraying material onto a concrete base material, the coated sprayed surface was given a beautiful appearance with a dark ocher color. The micro-Vickers hardness of this thermal sprayed surface was 750 Kg/mm ² , which was sufficient hardness for a thermal sprayed surface. In addition, this thermal sprayed surface has corrosion resistance, abrasion resistance, and weather resistance (discoloration resistance).
It was also superior to enamel, etc., and was sufficiently durable for practical use.

Example 2 CuO = 3 parts by weight, ZnO = 18 parts by weight, Al ₂ O ₃ = 80
The mixed thermal spray material having a particle size of 53 to 10 .mu.m in parts by weight is a thermal spray material having a grayish-black color. When this was plasma arc sprayed onto the outer wall of a wooden building, the color tone of the coated sprayed surface after spraying was bright ocher and had a beautiful appearance.

Claims (1)

[Claims] 1 Copper oxide (CuO) 1~20% by weight, zinc oxide (ZnO) 5~40% by weight, alumina (Al ₂ O ₃ ) 40~
A thermal spray material consisting of 94% by weight.