JPS596175B2 - Method for rapidly cooling an object after heating using an arch-image furnace - Google Patents

Description

[Detailed Description of the Invention] In the process of recent rapid technological innovation, amorphous inorganic substances, namely amorphous metals, alloys, non-metallic inorganic substances,
This is largely due to the emergence of such amorphous composite materials.

The progress of these amorphous materials is due solely to the development of heating and rapid cooling techniques during their production. However, there are three types of conventional techniques in this field. That is, placing the crying object in a crucible and heating it with a plasma arc, a centrifugal express method using the inner wall of a drum, a gas gun, a piston anvil, or 1.
A method that combines the quenching method using the outer surface of two rolls, etc., a method that combines the quenching method of the above method (heating the object placed in the crucible with a halogen lamp), f (→ high frequency induction) There was a method that combined heating and the rapid cooling method in (). However, (
In method (a), since the plasma arc used as a means of heating is unstable, carbon is added to the electrode, but because of this, fine particles of dust generated from the arc adhere to the reflector, which deteriorates the reflectance of the heat rays and distorts the image. In addition to being difficult to maintain high temperatures, it cannot be used for objects that react with crucibles at high temperatures.

Furthermore, the desired molten material cannot be discharged from the nozzle of a conventional crucible at such a high speed, and the heating and cooling locations must be separated to some extent, making it difficult to make various materials amorphous. It has many drawbacks, such as an insufficient cooling rate. In addition, in the method (mentioned), heating with a halogen lamp is stable, but since the heat in the halogen is relatively low temperature, the image does not reach a relatively high temperature (only about 1,800℃), so Al2O3 or 3Al
High melting point substances such as 203.2Si02 cannot be melted. In addition, it has many drawbacks similar to the methods described above. In addition, although a stable high temperature can be obtained with the method ←→, it cannot be used for objects that will react with a crucible because it always requires a container or crucible to contain the object without conductivity. In addition, since the crucible was used, the heating and cooling locations were separated, so the cooling rate was not very high. Therefore, in the conventional method, since a crucible is used, it is often impossible to prevent reaction with the target substance, and it is generally not possible to produce amorphous from a substance with a high melting point of 1,800° C. or higher. The present inventors have conducted various studies with the aim of producing amorphous materials with high melting points that could not be obtained using conventional methods. The present invention was completed by combining heating and melting of the target object with an ultra-rapid cooling method.

In other words, a rare gas lamp, such as a xenon lamp, is placed horizontally at the first focal point of a light receiving mirror, and a flat reflecting mirror is placed outside the second focal point with the plane facing upward at about 45 points, and an emitting mirror is placed directly above the reflecting mirror facing downward. This method uses an image furnace and places a quartz glass dome at the imaging position of the radiation mirror.

A water-cooled copper substrate, on which a target object has been placed in advance, is hermetically fitted to the bottom of the quartz glass dome. The water-cooled copper base has a circular cross section, an upward concave arc with a large radius on the upper side, and a straight line on the lower side, and is attached to the quartz dome using bolts using heat-resistant packing. The structure is tightened or screwed, and an inlet is provided to introduce high pressure gas into the quartz dome. The quartz door is filled with an inert gas, etc., although the pressure varies depending on the nature of the object.

For continuous operation, a plurality of quartz domes are prepared and placed on a trolley and transported alternately to the focal point of the radiation mirror of the arc image furnace on a rail by a mini motor or manually. The position of the quartz dome is configured so that it can be precisely and finely adjusted in the XYZ directions by dial operation. The high-pressure gas pipe and the cold water pipe leading to the lower part of the water-cooled copper base, that is, the water-cooled copper block, are made of flexible ones and are installed with an extra length corresponding to the distance of the reciprocating movement of the quartz dome. Furthermore, the upper surface of the quartz dome is manufactured so that each part is approximately perpendicular to the angle of incidence of the light beam from above or diagonally above. This is to minimize the loss due to refraction of the heat ray. If you move the quartz dome containing the object under the focal point of the radiation mirror and focus on the object, the image of the xenon lamp will be 2,0000C to 3,500C because it is airtightly surrounded by the quartz dome. It generates a high temperature of °C, which cannot be obtained with conventional seed furnaces, and can even melt substances with high melting points. One of the features of the present invention is that the object is directly heated and melted, so there is no need for a crucible, even for non-conductive substances, so the object can be melted without contamination from the crucible. There is. When the target is completely melted, its size is smaller than the image size, so it becomes liquid, becomes spherical due to surface tension, and comes into point contact with the water-cooled copper substrate, so the amount of heat lost by heating is greater than the heat lost by cooling. are now far more common.

After that, the heating is stopped, and the method is as follows.
Either change the position of the quartz dome on the rail, turn on the power to the arc image furnace, or use a heat-resistant plate to block the photothermal rays during the process of emitting the photothermal rays from the receiver mirror. You may take one or more measures. Once the heating is stopped, the temperature difference between the target object and the water-cooled copper substrate is extremely large, so that the object is cooled extremely rapidly. The cooling rate of the conventional technology is approximately 1030 K/Sec, but in the method of the present invention, for example, using the above-mentioned apparatus, the cooling rate is approximately 1030 K/Sec.
It will be about K/Sec before 04. Another reason why the cooling rate of the method of the present invention is higher than that of the prior art is that the heated object is immediately quenched without moving within the dome. According to the method of the present invention, as described above, after heating using an arc image furnace, the target object can be ultra-quenched using a water-cooled copper substrate or the like, thereby making it possible to reliably produce amorphous amorphous.

Next, the method of the present invention will be explained in detail with reference to Examples.

Embodiment FIG. 1 is a partially cross-sectional explanatory diagram of an arc image furnace used for carrying out an example of the method of the present invention.

First, the light heat rays emitted from the xenon lamp 1 are reflected by the receiver mirror 2, then approximately upwardly reflected by the plane reflector 3, and further reflected by the emitter mirror 4, and then reflected by the quartz crystal placed at the imaging position of the emitter mirror. The light is focused on the dome 5. Quartz dome 5 is trolley 6
The image forming apparatus is loaded on the image forming apparatus, and is pulled by the wire 7 and brought to the vicinity of the imaging position and left almost stationary. Furthermore, the position of the target is the rail 14 of the trolley 6.
The XYZ-axis direction position adjustment device 8 attached to the unit allows precise fine adjustment using dials to match the image. If the photothermal rays are focused on the object 9, the temperature inside the dome will rise, and the temperature of the object 9 will also become extremely high. In this example, the temperature was about 3,000°C when measured with an optical pyrometer. FIG. 2 is an enlarged partial longitudinal cross-sectional view of the quartz dome 5 and the water-cooled copper base 11 used in the implementation of the present invention. Tightly loaded. The upper surface of the water-cooled copper substrate 11 is formed as a part of an upwardly concave spherical surface with a large radius, and has a short cylindrical shape with an internal hollow.
An inlet cold water pipe 12 and an outlet cold water pipe 12' were attached to the side surface for water flow. The short arrows show examples of the direction of cold water flow, and the long arrows passing through the quartz dome 5 show the direction of the photothermal rays. A lump of mullite composition is placed in advance as the object 9 in the center of the upper surface of the water-cooled copper substrate 11 inside the quartz dome 5, and the inert gas is filled with the inlet high-pressure gas pipe 13, and the pressure is adjusted with the outlet high-pressure gas pipe 13'. did.

FIG. 3 is a partial cross-sectional view taken along line A--A of the water-cooled copper board 11 shown in FIG. 2, and the short arrows shown in the copper board indicate an example of the direction of the cooling water flow. By heating for about 20 seconds, the object 9 completely melted and became spherical due to surface tension, and the spherical object 9 settled in the center of the water-cooled copper substrate 11 due to centripetal action. After this, the wire 7 of the trolley 6 was pulled to one side and moved on the rail 14 to stop the heating, and the object 9 was ultra-quenched by contact with the water-cooled copper substrate 11. The cooling rate was estimated to be about 1040K/Sec. In addition, after cooling, the mullite-based substance of the target object 9 is
When inspected by a ray diffraction test, the X-ray diffraction pattern was smooth as shown in Figure 4, which was completely different from the X-ray diffraction diagram of a mullite crystal with typical peaks shown in Figure 5, indicating that most of the material was amorphous. Since this was observed, it was confirmed that the material had become mullite-based amorphous. Based on the above, the effects of the present invention are as follows.

By using a 1 xenon lamp and covering the imaging point with a quartz dome, this type of artaimage furnace can heat the object at a high temperature that could not be obtained with conventional technology. It is possible to melt substances with high melting points that could not be melted conventionally.

2. According to the method of the present invention, all materials from conductors to insulators can be heated and melted in any atmosphere without a crucible, so the problem of contamination caused by a crucible as in the conventional method is solved.

3. In the conventional method, the molten object is moved a certain distance, so even if the object is made into a thin piece, the cooling rate is not very high. However, in the method of the present invention, the temperature decreases when the object is slightly away from the focus of the arc image, so heating is not possible. The close proximity of the parts to the cooling parts, combined with the contact cooling of the method of the present invention with a water-cooled copper substrate, results in quenching rates that exceed those of the prior art.

4. It is possible to ultra-rapidly cool the target material from a very high temperature using a water-cooled copper substrate without moving it, making it possible to obtain amorphous materials or metastable materials with high melting points that were previously unobtainable. It can greatly contribute to the advancement of the latest technology as a manufacturing method for other excellent materials such as electronic materials and optical equipment materials.

It should be noted that the above-mentioned embodiment is only an example of implementing the present invention.
The technical scope of the present invention is not limited to the scope of the above embodiments.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional explanatory diagram of an arc image furnace used for carrying out an example of the method of the present invention. FIG. 2 is an enlarged partial longitudinal cross-sectional view of a quartz dome and its cart used in the implementation of the present invention. FIG. 3 is a partial cross-sectional view of the water-cooled copper block. FIG. 4 is an X-ray diffraction diagram of mullite-based amorphous obtained by the method of the present invention, and FIG. 5 is an X-ray diffraction diagram of mullite-based crystalline material. In each figure, 1 is a xenon lamp, 2 is a light receiving mirror, 3 is a plane reflector, 4 is a radiation mirror, 5 is a quartz dome, 6 is a trolley, 7 is a wire, 8 is an adjustment device for the XYZ axis direction of the target position, 9 is an object, 10 is a gasket, 11 is a water-cooled copper base, 12 is an inlet cold water pipe, 12' is an outlet cold water pipe, 13 is an inlet high pressure gas pipe, 13' is an outlet high pressure gas pipe, and 14 is a rail.

Claims (1)

[Claims] 1 Using an arc image furnace, a heat-resistant glass dome and a water-cooled copper base are placed in an airtight manner near the imaging position, an object is housed between them, and the object is aligned with the imaging position. , an arc image furnace is used, which is characterized in that after the object is heated and melted by concentrated irradiation with the photothermal rays of the image furnace, the heating is stopped and the molten object is rapidly cooled by contact with the water-cooled copper substrate. Method for rapidly cooling the object after heating.