JPS6295352A - Heat-resistant coating material - Google Patents

Abstract

PURPOSE:A hydrophilic heat-resistant coating material, consisting of a specific curing agent and ceramics or further a mixture thereof with a metal, capable of forming a firm heat-resistant layer by coating and baking and suitable for molds, building materials, etc. CONSTITUTION:A coating material obtained by incorporating (A) a curing agent consisting of (i) alunite, (ii) powdery sodium silicate and (iii) sodium silicofluoride with (B) ceramics, e.g. silicon carbide or zirconia, and (C) a metal, e.g. manganese. An adequate amount of water is added to coat the base surface and the resultant coating layer is baked to form a heat-resistant layer. The compounding ratios of the components are preferably as follows; 40-65% component (i), 30-40% component (ii), about 5% component (iii) and 60-40wt%, based on 40-60% component (A), another material.

Description

[Detailed Description of the Invention] <Industrial Application Fields> This invention is applicable to various articles that are exposed to high temperatures, such as molds, molds, etc.
It belongs to the field of manufacturing, sales, and use of heat-resistant coating materials applied to building materials.

(Prior Art) Conventionally, there has been no way to prevent corrosion of metals due to high temperatures, heat resistance, gas, etc., and although there has been a demand for heat-resistant coating materials, nothing to be looked at has been developed.

(Problems to be solved by the invention) For example, the temperature of the surface of a casting mold is 750°C to 120°C.
No technology was known to effectively prevent oxidation caused by heat and corrosion caused by gas.

Further, in the case of a press drawing die, the temperature rises to 150° C. to 1200° C. at the moment of drawing, and there is a problem in that the die is chewed. Furthermore, since the protective tube of the thermometer that measures the furnace temperature is exposed to high temperatures, it corrodes early, so it had to be replaced at relatively short intervals.

(Means for Solving the Problems) However, by applying the heat-resistant coating material according to the present invention to the necessary surfaces, it is possible to protect the surfaces of metals, etc., and not only make them heat resistant and corrosion resistant, but also increase their hardness. However, the above problem was solved.

Its special feature is that it is hydrophilic, turns into a slurry with water, and can be applied.

That is, in this invention, various ceramics or a mixture of ceramics and metals are added to a hardening agent consisting of alumite, powdered sodium silicate a, and sodium fluorosilicide, and an appropriate amount of water (for example, 40% to 50%), coated on the base surface, gradually raised the temperature to 50°C to 200°C for about 30 minutes, and then heated to 980°C to 100°C using a gas fire, etc.
One set of fire-resistant coated molded articles which did not cause high-temperature collapse or melting by firing at 250° C. for 5 to 15 minutes was produced.

In this invention, the content of alumite is 40% to 65%, sodium silicate is 30% to 40%, and sodium fluorosilicide is about 5%. Ceramics include silicon carbide, zirconia, graphite, Possible materials include shirasu, pearlite, nitrogen silicon, etc., and metals include manganese, chromium, and steel.

(Action of the invention) The heat-resistant coating material of this defense is hydrophilic and can be made uniform by adding water and kneading it. Can be applied thinly to the surface. Furthermore, by baking, the layer is firmly attached to the base surface, and there is no risk of it peeling off even if it is subjected to severe thermal changes.

(Example 1) An example for coating a mold surface or a protective tube for temperature control inside a furnace will be described.

55% alumite, 60% hardening agent consisting of 40% powdered sodium silicate and 5% sodium fluorosilicide, 5% chromium,
If 28% silicon carbide and 7% zirconia are placed in the same container and stirred and mixed uniformly, a heat-resistant coating material that can be applied to the surface of a mold or the like can be obtained. To apply the coating material to the surface of the mold 1, add 40% to 50% water to the coating material, stir evenly, and apply the slurry with a brush to a thickness of 0. Apply a coating layer of .4 mm. The mold 1 was placed in a drying oven, and the temperature was gradually raised to 50°C to 200°C for about 30 minutes to dry it, and then heated to 98°C using a gas fire or the like.
By raising the temperature from 0° C. to 1250° C. in 5 minutes and baking at a constant temperature for 15 minutes, a fire-resistant coating layer 2 that does not collapse or melt at high temperatures can be obtained.

The surface of the coating layer 2 is polished to a thickness of 0°2m.
Polish the surface to a mirror finish at about m. The coating layer 2 may have a thickness of, for example, about 0.5 mm to 0.2 am,
It has been confirmed that it has great fire resistance and can withstand high temperatures of, for example, 1500°C to 1600°C for a long time. Furthermore, there is no risk of high temperature corrosion (gas resistance) occurring.

(Example 2) Next, the insulation coating material will be explained.

60% hardening agent consisting of 60% alumite, 35% powdered sodium silicate, and 5% sodium fluorosilicide, and 33% silicon carbide.
By placing 7% zirconia and 7% zirconia in the same container and stirring and mixing them uniformly, an insulating coating material can be created.

Add 45% water to the coating material and knead it, and when it becomes muddy, apply it to the surface of the iron plate 1 to a thickness of 0.3 mm.The iron plate 1 is placed in a drying oven and gradually heated to 50°C to 200°C. Dry at elevated temperature for about 30 minutes, then heat to 98% over a gas fire, etc.
If heated to 0° C. to 1250° C. in 5 minutes and then baked at a constant temperature for 10 minutes, the heat-resistant coating layer has excellent insulation properties and is excellent for use in switchboards and other electrical equipment.

(Effects of the Invention) The present invention provides a heat-resistant coating material comprising a ceramic or a mixture of ceramic and metal as a hardening agent,
Moreover, since it is hydrophilic, by adding an appropriate amount of water to the coating material, it can be firmly adhered to metal surfaces or other article surfaces.

Although it was thought to be extremely difficult to firmly adhere fire-resistant coatings to metal surfaces, the coating material of this invention can be applied by adding water and kneading, and can also be baked to form a strong heat-resistant layer. can be formed. Therefore, the coating material of the present invention has the effect that it can be easily provided as a thin layer on the surface of an article after being kneaded with water, and can also be made into a strong heat-resistant layer by baking.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an example of the use of the coating material of this invention.
FIG. 2 is a sectional view of another example of use. 1...Mold (or iron plate) 2...Heat-resistant coating layer

Claims (1)

[Scope of Claims] 1. A hydrophilic heat-resistant coating material made of a hardening agent consisting of alumite, powdered sodium silicate, and sodium silicofluoride in which ceramics are added, or a mixture of ceramics and metals. 2. Ceramics. is silicon carbide, zirconia, graphite, shirasu, pearlite, or silicon nitride.The heat-resistant coating material 3 according to claim 1, wherein the metal is manganese, steel, or metal fiber. Heat-resistant coating material 4 Heat-resistant coating material 5 according to claim 1, in which the curing agent is 40% to 65% alumite, 30% to 40% powdered sodium silicate, and about 5% sodium silicofluoride. The heat-resistant coating material according to claim 1, in which the curing agent is 40% to 60% and the other materials added thereto are 60% to 40%.