JPS60251185A - Radiator - 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] Industrial applications The present invention relates to an infrared radiator for a heater or a cooker.

Conventional configurations and their problems Infrared radiators for heaters and cookers include, for example, ceramic coatings formed on metal base materials by plasma spraying, ceramic bulk moldings, and metal moldings. I use my body etc.

Table 1 shows the heat resistance, thermal shock resistance, infrared emissivity moldability, and manufacturing cost of the radiator.

If the first surface radiator has poor heat resistance and thermal shock resistance, the life of the device will be shortened, and if the emissivity is low, highly efficient radiant heating cannot be performed.

If the moldability is poor, there are restrictions on where and how it can be used.

Ceramic coatings produced by plasma spraying have a high emissivity, but because of their thick coatings, they are vulnerable to thermal shock, easily peel off, and it is difficult to make coatings with complex structures, and they are expensive. expensive.

Nanau mix bulk is thermally superior, but has problems in terms of formability and cost.

Regarding metal base materials, there are no problems in formability or cost, but there are problems in heat resistance, and moreover, the emissivity is low, so highly efficient radiation heating cannot be performed.

Purpose of invention The present invention solves the above problems and is heat resistant.

The purpose of the present invention is to provide a low-cost radiator that has excellent thermal shock resistance, high infrared emissivity, and excellent moldability.

Structure of the Invention In order to achieve the above object, the radiator of the present invention is made of ZrO2
, T:02, AA! 203, S, 02. C80
2 or more of Zr02 (hereinafter referred to as ZrO2-C802) in solid solution;
, S s 3N4 and a cured body of borosiloxane resin is formed on a base material of either metal or ceramics, and the coating is used as a radiation surface.

According to the above configuration, since the coating has better heat resistance than metal, thermal deterioration of the base material is prevented when the base material is metal. Furthermore, since it is flexible against thermal shock, peeling of the membrane due to thermal shock is less likely to occur. In addition, the infrared emissivity increases to 0.8 to 0.9 due to the optical effects of the oxide particles and the cured polysiloxane resin.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially enlarged plan view of an embodiment of the radiator of the present invention.
A film is formed on a net-shaped metal base material.

FIG. 2 is an enlarged sectional view of the main part of FIG. 1. Figure 2 Nioite, Z, 02, TlO2, Al2O3, s, o, 2
゜A film consisting of oxide particles 1 of one or more of Zr02-C and 02, particles 2 of S1c and Si3N4, and a cured body G of borosiloxane resin is formed on the metal base material 4. ing.

Hereinafter, the effects of the above configuration will be explained.

For example, borosiloxane resin has the formula shown below, and exhibits organic properties such as being soluble in organic solvents such as toluene and xylene at room temperature. When the borosiloxane resin is heated to 600° C. or higher, organic components such as phenyl groups are decomposed and evaporated, resulting in a hardened inorganic borosiloxane resin consisting of three elements: Si, B, and O. The cured polysiloxane resin produced in this way has a heat resistance temperature of 100
By forming a film on a metal base material at a high temperature of 0°C or higher, thermal deterioration of the metal is prevented.

In addition, the cured porosiloxane resin has many pores where the organic components of the borosiloxane resin have decomposed and evaporated, and the pores can absorb and alleviate the expansion and contraction of the coating due to rapid thermal shock. Film peeling due to thermal shock is less likely to occur.

According to this example, peeling of the film did not occur even when the atmosphere was rapidly cooled from 1000° C. to water temperature, and the same result was obtained even after this thermal cycle was repeated 10 times.

Next, optical effects will be explained.

When light is irradiated onto a substance, light is reflected, transmitted, and absorbed. Taking the intensity ratio of reflected light, transmitted light, and absorbed light to incident light, we get reflectance r, transmittance t, and absorption rate a, which is r+t+
The sum of a becomes 1.

r + t + a = 1 According to Kirchhoff's law, the absorption rate a is equal to the emissivity ε, so r + is also 1 ε=1. When there is no light transmission as in this embodiment, r 0a = r+ε=1. Therefore, in order to increase the absorption rate (emissivity), it is sufficient to decrease the reflectance.

S 1C and S t 3N4 according to this example have a low reflectance from visible light to infrared rays with a wavelength of approximately 8 μm, and as a radiator, particles that have a high emissivity of infrared rays with a wavelength shorter than 8 μm are dispersed, and light is transmitted into the coating. It should be scattered and absorbed by The oxide particles have a refractive index different from that of the cured borosiloxane resin and increase the light absorption rate (emissivity).

Next, the moldability of the radiator of this example will be explained. The radiator according to the present invention has the oxide particles "c, s" on the base material.
It is produced by coating a mixture of 3N4 and borosiloxane resin and then curing it with heat. With this method, even if the base material has many end faces as shown in Figure 1, it is possible to form a film. becomes easier.

An example of a method for manufacturing a radiator according to this embodiment will be described below.

ZrO2'eo2 and A1 with an average particle diameter of around 0.3 μm
2o3, SIC, boron"-san resin (for example, SMP-32 from Showa Denshin Co., Ltd.), and toluene←葎4
shii- was blended with the composition shown in Table 2, stirred, and made into a paint. After that, it was coated on a stainless steel substrate and heated to 300℃ for 3 hours.
The film was cured by heating at 750° C. for 30 minutes. The film thickness of the radiator made in this way is as thin as 15 to 20 μm, but the radiator made by the coating method has a wavelength of 2 to 6 μm and an emissivity as shown in Table 2, compared to the conventional plasma spraying method. The cost is lower than that of Ceramic Socnuval.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) The heat resistance and thermal shock resistance of the coating are superior to metals, so the lifespan of equipment can be extended.

(2) Since the emissivity of infrared rays is high, radiant heating can be performed with high efficiency.

(3) Since it is a coating method, moldability is good and manufacturing cost is low.

[Brief explanation of drawings]

FIG. 1 is an enlarged plan view of a section of a radiator according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part of FIG. 1. 1...Oxide particles, 2...S, C or 5
13N4 particles, 3... borosiloxane resin cured body, 4... metal base material. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] ZrO2, TlO2, Al2O3, SiO2, C,02
A coating consisting of oxide particles of one or more of ZrO2 in solid solution, rice grains of either SiC or Si3N4, and a cured product of polysiloxane resin is applied to a base material of either metal or ceramic. A radiator formed on the top of the radiator and having the coating as a radiant surface.