JPS6029858B2 - High temperature heat treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high temperature heat treatment apparatus, particularly a high temperature
The present invention relates to a device that enables heat treatment that requires a high temperature of 0 for only a short period of time (several minutes).

This type of heat treatment equipment generally consumes a large amount of electricity or fuel and requires a large-scale heat-insulating part.Therefore, it is desirable to have a simple equipment that requires as little electricity or fuel as possible. It is.

Conventionally, electric furnaces, combustion heating furnaces, and other furnaces have been used as heat treatment apparatuses at such high temperatures (1,800 to 200,000 ℃). '1} Electric furnaces are mainly used as heat treatment apparatuses that require electric furnaces of 1,800 to 20,000 degrees.

Electric furnaces are widely used because their heating method is relatively simple and their temperature can be easily controlled. However, 1800
High-temperature electric furnaces for use at ~2000 pm have the following drawbacks. [a} The insulation part must be made very precisely. 'b} It takes a considerable amount of time to raise the temperature to 1800 qo.

[c} Consumes a lot of power.

{d} The heater and furnace wall are damaged quickly, and the damage due to oxidation is particularly severe when heating in air.

(2) Combustion heating furnace This is a furnace that injects and burns a heatable gas or heatable liquid together with air or oxygen to obtain a high temperature.

Although this method can obtain high temperatures in a short time, it has the following drawbacks. [a} It is necessary to treat high-temperature waste gas.

[b} Uniform heating is difficult.

{c- Temperature control is difficult.

'd- The furnace wall is getting damaged quickly.

[e} A thermal combustion injection device, an ignition device, etc. are required, making the entire device complicated.

Glue Other devices and methods Possible methods for obtaining temperatures above 1800q0 include methods using arcs and lasers.These methods may be usable for heating minute parts, but they may be used for heating minute parts, but It is inappropriate as a method for heating things.

Another option is a solar furnace, but the equipment would be too large and would be impractical for general heat treatment work. The thermite method is a relatively simple method.

This method involves mixing aluminum powder and metal oxide and igniting the mixture, but the heat generated is instantaneous, and although it can be used for special tasks, it has limitations in terms of heat treatment in a broader sense. Therefore, the present invention overcomes the drawbacks of the conventional methods as described above, and provides a convenient method using a relatively small amount of electric power.
It is an object of the present invention to provide a heat treatment apparatus that can generate and utilize a temperature of 800 to 2000 CO.

Previously, the present inventors prepared a reaction mixture formed by laminating or rolling aluminum foil and carbon or carbonized paper, and heated the reaction mixture to 600 to 1200 qo in a non-oxidizing or non-reactive atmosphere.
It has been found that when heated preferably to 800 to 100,000 ℃ and then brought into contact with a mixed gas of oxygen and nitrogen or air, the temperature rapidly reaches 1,800 to 2,000 qC and aluminum nitride is produced. A patent application has been filed for the manufacturing method.

The subject matter of the present invention is a heat treatment apparatus that utilizes this exothermic reaction during the production of aluminum nitride.

Therefore, the high-temperature heat treatment apparatus of the present invention accommodates a heat treatment chamber and an exothermic reactant arranged to surround the heat treatment chamber and made of aluminum foil and carbon or carbonized paper alternately stacked or wound. a chamber, means for maintaining the chamber containing the exothermic reactant in a non-oxidizing or non-reacting state, means for supplying a mixed gas of oxygen and nitrogen or air to the chamber, and means for preheating the exothermic reactant. and the exothermic reactant in a non-oxidized or non-reacted state.
This device is configured to preheat to a temperature of 0, then contact with air or a mixed gas of oxygen and nitrogen, and utilize the heat generated at that time. The heat treatment chamber in the apparatus of the present invention may be of any shape, and for example, a rubbo made of Shigeru, quartz, metal, etc., a hollow tubular body, etc. are used.

A chamber containing an exothermic reactant is provided surrounding the heat treatment chamber. The exothermic reactant is a mixture of alternating layers or wraps of aluminum and carbon or carbonized paper. This may be obtained by burning or dry distilling a capacitor element. When using the apparatus of the present invention, first the exothermic reactant is heated to 600 to 1200°C, preferably 800 to 100°C, in a non-oxidized or non-reacted state.
The exothermic reaction must be induced by preheating at a temperature of 0.000°C.

This is done, for example, by electric induction heating. The exothermic reactant is then contacted with a gas mixture of oxygen and nitrogen or air. This is done by supplying air or a gas mixture to a chamber containing the exothermic reactants;
This caused a rapid exothermic reaction, resulting in a
A high temperature of 0 is obtained. The exothermic time varies depending on the size of the heat treatment chamber, the filling amount of the exothermic reactant, the ratio of aluminum foil to carbon, etc., but is usually about 1 to 2 minutes to 10 minutes. The exothermic reactant can be cooled and easily replaced with a new one after the exothermic reaction is complete. The heat treatment apparatus of the present invention can be used for, for example, melting, evaporation, scaling, bonding, hardening, crystal growth, etc., depending on the type of article to be heat treated, treatment time, etc.

Hereinafter, the present invention will be explained in more detail using specific examples.

FIG. 1 illustrates a specific example of a high temperature heat treatment apparatus according to the present invention.

Here, 1 indicates an electric furnace and 2 indicates its heater. This heat treatment apparatus is characterized by a mixture of aluminum foil and carbon (or carbonized paper) filled between the heating rubbo (3) and the sample rubbo (4). In FIG.
After preheating to 200 qo, when exposed to a mixed gas of oxygen and nitrogen or air, the exothermic reactive mixture of 5 rapidly generates heat, reaching about 1800-2000 qo. At this time, no bonito or irritating toxic gases are generated, and the heat generation is very quiet and safe. Due to this heat generation, sample Rubbo 4
The sample 6 inside is subjected to heat treatment. The exothermic time can be changed depending on the purpose by adjusting the size of Rubbo, the weight of the exothermic reactant (5), and the filling ratio. FIG. 2 shows another specific example of the heat treatment apparatus according to the present invention, which is a two-piece heat treatment apparatus for heat treating rod-shaped or pipe-shaped articles.

Of course, it is not limited to the shape of a pipe or a pipe, and it is also possible to heat-treat a small sample within a quartz tube. In Figure 2, 1 is an electric furnace, 2 is a heater, and 3 is a special magnetic rubbo made for splitting into two parts.One side of the side remains open, but the other side is the bottom, and the gas A tube 7 is provided through which water can flow. Further, 5 is an exothermic reactive mixture of aluminum foil and carbon (or carbonized paper) as in the case of the heat treatment apparatus described above.
To obtain a high temperature, first, the exothermic reactant 5 is preheated to a temperature between 600 and 1200 degrees Celsius using the heater 2 of the electric furnace 1. During this time, a gas such as argon is passed through the exothermic reactant 5 through the inlet pipe 7 and the outlet pipe 8 to prevent the aluminum foil from being oxidized. After heating to a predetermined temperature, a mixed gas of oxygen and nitrogen or air instead of argon is passed through the exothermic reactant 5. As a result, the exothermic reactant 5 undergoes a rapid exothermic reaction and reaches 1,800 to 200,000. In FIG. 2, the electric furnace 1 is placed horizontally, but of course it can also be placed vertically. The heat treatment apparatus of the present invention has the following effects compared to conventional ones.

'a} The minimum preheating temperature is 60,000, and the maximum is 12.
00°C and consumes less power.

'b} The heat insulation part can be simplified.

{The time it is maintained at c-1800~2000oo is about 1 powder at the longest, so there is little damage to the inner wall of the heat treatment chamber} Rubbos, hollow tubular bodies, etc. that form the heat treatment chamber are repeatedly It is easy to use and replace when folded.

[e- By changing the shape of the heat treatment chamber, articles of various shapes can be heat treated.

'f' as a whole can be manufactured in a smaller size and at a lower cost than conventional devices.

Furthermore, by devising the shape of the heat treatment chamber, the method of filling the exothermic reactants of aluminum foil and carbon (or carbonized paper), etc., it can also be applied as a zone melting apparatus.

[Brief explanation of drawings]

1 and 2 are schematic cross-sectional views of a specific example of a heat treatment apparatus according to the present invention. Here, 1 is an electric furnace, 2 is a heater, 3 is a rubbo containing an exothermic reactant, 5 is an exothermic reactor, 7 is a gas inflow pipe, 8
is the gas outflow pipe. Multi-Z box 2 diagram

Claims (1)

[Claims] 1. A heat treatment chamber, a chamber arranged to surround the heat treatment chamber and containing an exothermic reactant made of aluminum foil and carbon or carbonized paper alternately layered or rolled, and a chamber containing the exothermic reactant. means for maintaining the chamber in a non-oxidizing or non-reactive state; means for supplying a mixture of oxygen and nitrogen gas or air to the chamber; and means for preheating the exothermic reactant. A high-temperature heat treatment apparatus configured to preheat to a temperature of 600 to 1200° C. in an oxidizing or non-reactive state, then contact with a mixed gas of oxygen and nitrogen or air, and utilize the heat generated at that time.