JPS6241789A - Far infrared ray heater and manufacture - 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 application field) The present invention relates to a far-infrared heater and a method for manufacturing the same.

(Conventional technology) Conventionally, in order to produce a product using a molded body of a ceramic material such as aluminum oxide or glass whose main component is silica, a conductive film or a heating resistor film is formed on the surface of the molded body. , metals and metal oxides are deposited by vacuum evaporation, sputtering, ion blating, plasma spraying, wet electroplating, and conductive paint coating. Far infrared heaters in combination with

(Problems to be Solved by the Invention) The conventional manufacturing methods and devices described above require troublesome manufacturing operations and high manufacturing costs, and are not necessarily effective as far-infrared heaters.

(Means for solving the problems) The present invention solves the above problems and
The present invention provides a stable and robust ceramic far-infrared heater capable of emitting far-infrared rays in the μm range, particularly in the range of 5 μm to 15 μm, which is effective for the human body.

That is, the far-infrared heater of the present invention has alkoxytin halide SnXn (OR)4 on the surface of the ceramic molded body.
-n (where X is halogen, R is alkyl group, n is 0-
It integrally has a membrane whose main component is the oxidative decomposition product of 4).

Furthermore, the present invention provides a method for producing the above-mentioned heating element heater easily and economically, in which alkoxytin halide Sn
A solution of n(OR)4-H or a solution doped with alkoxyantimony halide 5bX7(OR), -y (where X is a halogen, R is an alkyl group, and y is 0 to 3) is uniformly deposited. The oxidative decomposition reaction is carried out at the same time as the oxidation reaction is carried out, and a baked film mainly composed of the oxide is formed integrally.

(Example) As the ceramic material, various conventionally known ceramic materials can be used, but preferably aluminum oxide, Al,
○,, Zirconium oxide Z r O! Either alone or a composite ceramic material containing this as a main component is used. According to the present invention, a molded body of such a ceramic material, for example, a plate-shaped molded body, is heated in an electric furnace or the like, and on the heated surface,
SnXn(OR) 4-, H (where X is halogen, R is alkyl Mr n is 0 to 4) or an alkoxy tin halide solution with a composition of 5bxy (OR) s -y
(Here, X is halogen, R is alkyl group, y is 0-3
A solution doped with alkoxyantimony halide having the composition shown in ) is applied uniformly to the entire surface by spraying or coating. As the solvent, water, alcohol-based, ester-based, aromatic and other organic solvents can be used alone or in combination. The heating temperature of the molded body is 300°C, which is sufficient to cause the solution to undergo a thermal oxidative decomposition reaction and to form a fired film with conductivity of several tens of Ω/mouth or more, which is mainly composed of tin oxide or a composite oxide of tin oxide and antimony oxide. or more preferably 450'C
It takes a certain degree. Thus, in general, the number 10 Q/ro or more number 10
To obtain a heat generating resistor film of 00/ro or less. The thickness of the fired film is generally a few microns to several hundred angstroms,
A stable and robust product that firmly adheres to the surface of the molded body can be obtained, and a heating element film with reduced manufacturing costs can be obtained without the need for expensive equipment or troublesome work as required by conventional vacuum evaporation methods. The fired film is transparent and has a good appearance. In addition, when the solution is applied to the surface of the molded body by spraying, the amount of spraying can be easily adjusted, and a fired film can be obtained immediately and uniformly, and the conductivity can be easily adjusted, so that a predetermined variety of conductivities can be obtained. It is advantageous to be able to obtain a ceramic molded body with

Next, as a specific example of the present invention, 5μ, which is useful for the human body, will be described.
A far-infrared heater capable of generating a particularly large amount of far-infrared rays having a wavelength of m to 15 μm will be explained.

In methanol, 5nOlx(OR)4-x (where R is an alkyl group, dn(OR)3-n
(where R is an alkyl group and n is 0 to 5) was added and dissolved in a solution containing 105 (HI
A plate-shaped aluminum oxide molded body of nB x 5 mm (thickness) was heated to 500°C, and a spray gun was used to uniformly adhere it to the entire surface at an air pressure of 1 kg/cnf. The spray pressure is 0.4yu/cr? r~
Generally, the range is 2.0/c%, but around 9/c is preferable and it was possible to spray with good mist particles.

The adhering mist particles immediately undergo an oxidative decomposition reaction due to the heated surface of the ceramic molded body, which is heated to a high temperature of around 500°C, and become 1 μm thick, mainly consisting of a composite oxide containing tin oxide and antimony oxide as seen in the evening scene. Resistor 200 to 30
It was obtained as a conductive thin film in the range of 0 Ω/mouth. After being allowed to cool to room temperature in this manner, a ceramic far-infrared heater having a good heating resistor film firmly, stably and firmly adhered to the surface of the ceramic molded body was obtained. In order to check its performance as a far-infrared heater, silver electrodes were baked on both edges of the plate and electricity was applied to it. As shown in Figure 1, the amount of far-infrared rays generated is particularly large at wavelengths of 5 to 15 μm, which are particularly effective for the human body, but the amount generated is small at near-infrared wavelengths, which can cause burns. It has been found that certain characteristics can be obtained.

Figure 2 shows a conductive ceramic prepared in the same manner as in the previous example except that zirconium oxide, ZrO, was used instead of hl and o as the ceramic molded body, and was subjected to the same far-infrared radiation test. Showing the measurement results,
Similarly to the above, it was recognized that this product is especially advantageous as a far-infrared heater.

Air pressure 1#/c++! We investigated the relationship between the spraying time of the solution and the concentration of the solution at a constant value of 0.65 mol/l to 5 mol of alphoxytin chloride.
/ In the range of 1, the time varies from 2 to 10 seconds, but in all cases, it is enough to spray short poems. Spray pressure is o, 4kg/cm
l~2. OklI/C's own range is general.

Next, we investigated the relationship between resistance and alkoxytin chloride alone and solutions in which the amount of alphoxyantimony chloride was added in different colors, and the results shown in Shinkei 5 were obtained.

As shown in FIG. 3, the resistance value changes depending on the amount of dopant added. Generally, the amount of sb added is 10 mo1
% is preferred.

Thus, heat generating resistive films having different resistance values can be obtained depending on the application by controlling the amount of dopant added as described above.

When the heating temperature of the molded body is set to 300°C or higher as shown in Figure 4, conductivity can be obtained.In the case of an infrared heater, it is desirable to have several hundred Ω/hole, so in order to obtain this, the heating temperature is about 450°C or higher. preferable.

The amount of solution sprayed was as shown in Figure 5 when the solution in the above specific example was used.

In this way, heating resistor films with various characteristics can be obtained by adjusting the heating temperature and spraying amount.

Although the composition of the fired film of the present invention is currently unknown, judging from the fact that it is not a pure oxide, the reason why it can become a heat generating resistor is that metal atomic ions such as metal tin and chlorine ions due to crystal structure defects. It is presumed that this is because it functions as an electron donor and acceptor.

As described above, according to the present invention, a ceramic molded body is heated, and an alfuquidino-tin halogenide solution or a solution containing antimony alkoxyhalide is applied to the heated surface of the ceramic body, and a heating oxidative decomposition reaction is caused. A robust heating resistor film based on tin oxide alone or a composite oxide of tin oxide and antimony oxide that adheres tightly to the surface of the molded body can be obtained, and its production cost is low, making it suitable for far-infrared heaters. It has the effect of providing an excellent material.

[Brief explanation of drawings]

Fig. 1 is a graph showing the far-infrared radiation characteristics of the product of the present invention, Fig. 2 is a graph on the other side, and Figs. 3 to 5 are each sb
1 is a graph showing the relationship between the blending amount of /sn, the heating temperature of the molded body, the spraying amount of the solution, and the conductivity of the obtained product. Patent applicant: Kawai Musical Instruments Co., Ltd. Agent: Kinji Kitamura (,,-”,:”t
j. 2 people Figure 1 Figure 3 Figure 4 15. (md”/-) group, i;
A''

Claims (1)

[Scope of Claims] 1. Mainly contains oxidative decomposition products of alkoxytin halide SnX_n(OR)_4_-_n (where X is a halogen, R is an alkyl group, and n is 0 to 4) on the surface of a ceramic molded body. A far-infrared heater integrally having a film as a component. 2. SnX_n(O
R)_4_-_n (where X is a halogen, R is an alkyl group, n is 0 to 4) or a solution of alkoxyantimony halide SbX_y (OR)_3_-_y (where X is a halogen, R is an alkyl group) , y is 0 to 5) is uniformly deposited and a heating oxidative decomposition reaction is carried out to integrally produce a fired film mainly composed of the oxide. 3. Manufacturing the far-infrared heater according to claim 2, wherein the heating temperature of the molded body is 300°C or higher, and the solution is uniformly adhered to the surface heated to the temperature by spraying. Law.