JPH02167876A - Surface-coated ceramic sintered compact and surface finish of ceramic sintered compact - Google Patents

Abstract

PURPOSE:To obtain the title sintered compact with film of excellent in resistance to impact, acid and wear, etc., highly persistent in its surface color tone by spraying on the surface of a ceramic sintered compact a molten polymeric powder coating or its combination with inorganic granules to effect setting. CONSTITUTION:The surface of one of a variety of ceramic sintered compact is sprayed with a molten polymeric powder coating or its combination with inorganic granules to effect setting. Said powder coating is e.g. PE-, PP-, thermosetting epoxy-based coating. Said inorganic granules are required to be robust ones in order to impart the coating layer with wear resistance, being e.g. glass beads, silica powder, sand. The film of the surfacecoated ceramic sintered compact obtained is thick, being excellent in resistance to wear, impact, water and chemicals including acid, water proofness, etc. Furthermore, said film is clear in surface color, causing virtually no color fading and being markedly high in the adhesive force to the sintered compact as matrix.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a surface-coated ceramic sintered body and a surface finishing method for a ceramic sintered body, and particularly relates to a surface-coated ceramic sintered body having a coating layer that is strong within the thickness. The present invention relates to a surface finishing method for ceramic sintered bodies and ceramic sintered bodies.

[Prior Art] Ceramic sintered bodies such as bricks, tiles, ceramic blocks, and clay roof tiles are mainly used as constituent materials of civil engineering and architectural structures, or as part thereof. The color tone of these ceramic sintered bodies largely depends on the type of clay used, but surface treatments such as coloring are often required for aesthetics, waterproofing, or other purposes. There is.

Conventionally, the common methods for coloring ceramic sintered bodies include mixing pigments with clay and firing it to color it, or applying glaze to the surface of the ceramic sintered body and firing it to color it. be. Further, depending on the case, there may be a method of painting the surface after hardening by electrostatic coating, or a method of painting the surface after hardening using ordinary paint.

[Problems to be Solved by the Invention] Among the above conventional coloring methods, the coloring method using pigments has the following problems:
Due to discoloration and fading due to efflorescence L9, it is difficult to maintain the bright colors at the time of manufacture for a long period of time. In addition, with glaze methods or painting methods, such as electrostatic coating and paint methods, it is difficult to obtain a sufficiently thick and robust coating because it is difficult to obtain a desired thick film and there are problems with adhesion. I couldn't.

By the way, since ceramic sintered bodies have a serious drawback that needs to be solved in that their impact resistance is extremely low, it is strongly desired to improve the impact resistance, but none of the above methods can improve the impact resistance. It is difficult to achieve this goal.

In particular, when it comes to surface coating of ceramic sintered bodies, it is important not only to improve the aesthetics but also to improve water resistance (which is the weak point of ceramic sintered bodies).
It is often applied to improve the coating's properties (waterproofing), acid resistance, and chemical resistance, but the conventional coating methods described above have problems with the adhesion and thickness of the coating layer formed. The reality is that good waterproofing, acid resistance, and chemical resistance cannot be achieved.

The present invention solves the above-mentioned conventional problems, and has a thick wall that does not easily change or fade in color and has significantly improved impact resistance, waterproofness, acid resistance, chemical resistance, and even abrasion resistance. An object of the present invention is to provide a ceramic sintered body in which a highly elastic paint coating layer is formed on the ceramic sintered body, and a method for easily forming such a paint coating layer on the ceramic sintered body.

[Means for Solving the Problem] The surface-coated ceramic sintered body of claim (1) has a heat-fused polymer powder coating or a heat-fused polymer powder coating and an inorganic material on the surface of the ceramic sintered body. The method for finishing the surface of a ceramic sintered body according to claim (2), characterized in that the surface finishing method of a ceramic sintered body is carried out by spraying and fixing a granular material, is to coat the surface of the ceramic sintered body with a heated and melted polymer powder coating or a heated It is characterized by spraying and fixing molten polymer powder coating and inorganic granules.

That is, the present applicant has developed a method of spraying molten polymer powder paint onto the surface of a hardened cement body by thermal spraying, and has previously filed a patent application (Japanese Patent Publication No. 63-44715). According to the method, it is possible to form a thick coating film with a clear color and less fading on the surface of a hardened cement body. As a result of various experiments, the present inventors found a method for forming a good coating film on a ceramic sintered body, and as a result, by applying the technology disclosed in Japanese Patent Publication No. 63-44715, The present invention has been completed by discovering that it is possible to form a thick coating film with clear coloring with little fading on the surface of a ceramic sintered body and having excellent properties.

The present invention will be explained in detail below.

In the present invention, the ceramic sintered body forming the coating layer is not particularly limited, and various ceramic sintered bodies can be used. However, if the porosity is less than 3%, the coating layer will not be attached. The adhesion force may not be sufficient. Therefore, it is preferable that the porosity is 3% or more, but if the porosity is too large, unevenness will be formed on the surface of the coating layer, and the strength of the cera-main ivy sintered body will be insufficient. Therefore, in the present invention, it is preferable that the porosity of at least the surface layer portion of the surface on which the coating layer is formed of the ceramic sintered body is 3 to 20%.

In the present invention, a heated and melted polymer powder coating or a heated and melted polymer powder coating and inorganic granules are sprayed onto the surface of such a ceramic sintered body and fixed thereon.

There are no particular restrictions on the polymer powder coating, and various types of polymer powder coatings can be used, but in particular, polyethylene, polypropylene, polybutylene, and thermosetting epoxy coatings can be used to provide acid resistance and chemical resistance. This is extremely advantageous because a coating layer with excellent properties and abrasion resistance can be formed.

The inorganic granules must be strong in order to impart wear resistance to the coating layer, and it is desirable that the particles fall within a certain particle size range. There are no particular restrictions on the material, etc., as long as it satisfies the requirements.
Examples of inorganic particulates include glass peas, quartz particles, sand,
Crushed blast furnace slag, metal particles, etc. can be used.

If the particle size of these particles is too small, the effect of improving the sliding resistance value will be low, and if the particle size is too large, they will peel off from the surface coating layer, resulting in poor wear resistance. The particle size of the inorganic granules is preferably in the range of 0.05 to 0.15 mm.

When inorganic particulates are mixed into a polymer powder coating, the mixing ratio is such that if the ratio of inorganic particulates is small, the abrasion resistance and sliding resistance of the layer to be formed will be low, and the inorganic particulates will If the ratio is large, surface peeling will occur.

Therefore, the mixing ratio is 100 parts by weight or less, especially 20 to 100 parts by weight of the inorganic particulate material to 100 parts by weight of the polymer powder coating.
60! Preferably, it is expressed in parts.

In the present invention, the polymer powder coating or the polymer powder coating containing inorganic particulates is conveyed by a gas stream and heated to melt the polymer powder coating. Then, a gas flow containing the molten polymer powder coating or inorganic particulate-containing polymer powder coating is sprayed onto the ceramic sintered body, and the polymer powder coating or inorganic particulate-containing polymer powder coating is applied to the ceramic. A coating layer is formed by colliding with the surface of the sintered body and fixing it.

Such spraying and fixing is carried out using an apparatus having a gas flow generating means for conveying the polymer powder coating or the polymer powder coating containing inorganic particulates, and a means for heating and melting the polymer powder coating conveyed by the gas flow. For example, ■: A polymeric powder coating or a polymeric powder coating containing inorganic particulates is conveyed in an air stream, and combustion gas is mixed with this air stream. A device that heats a molecular powder coating or a polymer powder coating and heats an inorganic particulate material.

■: A device that uses plasma instead of combustion gas in the device described in ■.

etc. are used.

Furthermore, the method of the present invention can also be carried out using an apparatus that allows polymer powder coating or polymer powder coating and inorganic particulate matter to be dispersed and introduced into a high-temperature gas flow such as combustion gas. can.

More specifically, the method of the invention can be carried out using conventional thermal spray equipment. Various types of thermal spraying equipment, such as gas type and plasma type, can be used.

In addition, when inorganic granules are used together with a polymer powder coating in the present invention, the polymer powder coating and the inorganic granules may be mixed in advance and supplied from a supply device, or they may be supplied from a separate device. It's okay.

In addition, if the surface of the ceramic sintered body is preheated before thermal spraying, the prevention of bubbles in the N layer will be further ensured, and the surface of the ceramic sintered body will be well dried and the coating will be formed. The adhesion between the layer and the ceramic sintered body is improved.

FIG. 1 is a sectional view illustrating a state in which a surface coating according to the present invention is applied using a gas thermal spraying apparatus.

In FIG. 1, reference numeral 1 denotes a thermal spray gun nozzle of a thermal spraying apparatus, which has a triple-pipe structure having a supply hole 2 for polymer powder coating, a conveying air blow-off hole 3, and a combustion gas supply hole 4.

The polymer powder paint 5 ejected from the injection port of the polymer powder paint supply hole 2 is transported by the air (from the conveyance air blow-off hole 3) and the combustion flame of the combustion gas from the combustion gas supply hole 4. 6 to become a molten state, collide with the surface of the ceramic sintered body 7, and adhere to the surface to form a polymer powder coating F!8.

The thickness of the N layer 8 to be formed can be easily adjusted by changing the thermal spraying time, and according to the method of the present invention, a thickness of 0.2 to 5 m can be formed by one thermal spraying process.
A coating layer of a polymer powder coating or a polymer powder coating containing inorganic particulates having a thickness of m can be arbitrarily formed.

[Function] In the present invention, the polymer powder coating or the polymer powder coating containing inorganic particulates is sprayed onto the surface of the ceramic sintered body in a heated and molten state to be fixed. Therefore, a thick coating layer of a polymer powder coating or a polymer powder coating containing inorganic particulate matter can be formed in a short time. Moreover, there is no need to use a solvent.

Moreover, the coating resin of the coating layer sinks into the voids on the surface of the ceramic sintered body, and due to its anchoring effect, the coating layer is firmly attached to the surface of the ceramic sintered body with high adhesive force.
Water permeability of the ceramic sintered body can be eliminated and waterproofness and water resistance can be imparted. Furthermore, the surface abrasion resistance and impact resistance are also improved.

[Examples] The present invention will be described in more detail with reference to Examples and Comparative Examples below, but the present invention is not limited to the following Examples unless the gist thereof is exceeded.

Examples 1 to 7 The surface of the ceramic sintered body shown in Table 1 was coated with the
The coating layer material with the mixing ratio shown in the table was thermally sprayed to a thickness of 1.5 mm.
A coating layer of mm was formed. The specific conditions are as follows.

Polymer powder coating type: Ethylene vinyl acetate particle size
: 0.08~0.2mm Inorganic granular material Type: Fine silica sand grain Size: 0.05~0.15mm Thermal spray equipment related conveyance air flow rate: 1201/min Combustion gas type: LP gas spray gun and ceramic sintered body Spacing: Approximately 20 cm Ceramic sintered body surface coryonic temperature: Approximately 120°C Area of formed coating layer: Approximately 200 cm All surfaces of the formed coating layer exhibit a vivid color tone, and this color tone easily fades. It was extremely durable without any scratches, had a smooth surface, had elasticity, and had a good feel.

Table 1C shows the surface condition, adhesion performance, wear amount, and sliding resistance value of the formed N layer.

The surface condition was examined by visual observation, and the adhesion performance was determined by J.
IS K5669 Synthetic resin emulsion putty 5.11
The adhesion strength was investigated by a peel test. In addition, the amount of wear was investigated using the asphalt pavement guidelines labeling test, which is used to evaluate the abrasion resistance of asphalt, and the slip resistance was investigated using the ASTM E303 slip resistance test, which is used to evaluate the slip resistance of pavement surfaces. .

Comparative Examples 1 to 3 A coating layer was not formed on the ceramic sintered bodies shown in Table 1.The wear amount and sliding resistance were examined in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 4 The properties of the coating layer of a glazed stone floor tile surface were investigated in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 5 An acrylic paint was applied to the surface of road paving bricks using a brush, and the properties of the coating layer were investigated in the same manner as in Example 1, and the results are shown in Table 1.

As is clear from Table 1, the coating layer formed on the surface of the cera main ivy sintered body according to the method of the present invention has sufficient adhesion and has a smooth and dense surface. It is clear that the formation of the coating layer significantly improves the wear resistance of the receramic sintered body and increases the slip resistance value.

Furthermore, by mixing inorganic particulates into the polymer powder coating, the sliding resistance value can be further improved. Furthermore, since the N layer having high elasticity can be formed within the thickness, it is also possible to compensate for the impact resistance, which is a drawback of ceramic sintered bodies.

Note that when a coating layer is formed on a ceramic molded body with a high porosity by the method of the present invention, the uneven shape of the base surface also appears on the surface of the coating film, but by increasing the thickness of the coating film, a dense and smooth [Effects of the Invention] As detailed above, the surface-coated ceramic-based sintered body of the present invention has the following properties: Excellent waterproof, acid resistant, chemical resistant, etc.

■ The colors of the table are clear and almost never fade.

■ Extremely high adhesion to ceramic sintered bodies.

■ It is extremely detailed.

A surface-coated ceramic sintered body having a coating layer formed on its surface and having excellent features such as the following is provided. Therefore, the surface-coated ceramic sintered body of the present invention is highly durable, can provide elasticity that cannot be obtained with conventional ceramic sintered bodies, and is also highly durable. It is also possible to significantly improve the impact resistance, which is a disadvantage of solid bodies. In particular, when the ceramic sintered body of the present invention is used for road paving, it is possible to provide a paving material with high slip resistance and excellent walkability.

According to the surface finishing method for ceramic sintered bodies of the present invention, it is possible to easily form the above-mentioned high-performance coating layer on various ceramic sintered bodies.

[Brief explanation of the drawing]

FIG. 1 is a sectional view illustrating the method for finishing the surface of a ceramic sintered body according to the present invention. 1...Thermal spray gun nozzle, 2...Polymer powder coating supply hole, 3...
Conveyance air outlet, 4... Combustion gas supply hole, 5... Polymer powder coating, 6... Combustion flame, 7... Ceramic sintering Body, 8... Polymer powder coating coating layer. Agent Patent Attorney Tsuyoshi Shigeno

Claims (2)

[Claims] (1) A surface-coated ceramic sintered body characterized by being formed by spraying and fixing a heated and melted polymer powder coating or a heated and fused polymer powder coating and inorganic particulates onto the surface of a ceramic sintered body. . (2) A method for finishing the surface of a ceramic sintered body, which comprises spraying and fixing a heated and melted polymer powder coating or a heated and fused polymer powder coating and inorganic particulates onto the surface of the ceramic sintered body. .