JPH0522156B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to metals, plastics, fibers, wood,
When heating and melting materials to be heated such as glass and ceramics (oxides and non-oxides) using light energy, it is possible to heat efficiently regardless of the light absorption rate of the material. The present invention relates to a heating melting method and an apparatus therefor.

[Prior Art] When manufacturing single crystals of magnetic materials such as yttrium orthoferrite and terbium orthoferrite, or dielectric and piezoelectric materials such as lithium niobate and lithium tantalate, conventionally, image furnaces or A reflecting mirror heating and melting furnace called a mirror furnace is used.

An example of this reflector-type heating and melting furnace is shown in FIG. is attached to the short axis side of the furnace body 2, and a hollow cylindrical furnace core tube 4 made of a quartz tube or a transparent quartz glass tube is inserted through the furnace body 2.
A rotatable shaft 5 and a rotatable shaft 6 that can freely move forward and backward are inserted into the furnace core tube 4, so that a material to be heated 7 can be attached to the light condensing portion between the shafts 5 and 6.
In the figure, 8 is a cooling pipe attached to the outer periphery of the furnace body 2, 9 is a molten portion of the material to be heated 7, and 10 is a single crystal.

The light from the halogen lamp 3 is reflected by the bi-elliptical reflector 1 as shown by the dotted line in FIG. The material to be heated 7 is heated and melted, and a single crystal is grown by the band melting method.

[Problems to be Solved by the Invention] However, in the above-mentioned reflecting mirror heating and melting furnace, when the material to be heated is a material with low light absorption, a material with high surface reflection, or a material with high light transmittance, etc. It is difficult to heat and melt the material to be heated. For example, glass materials made of the three elements of calcium carbonate, gallium oxide, and germanium oxide have poor heat absorption, so it is very difficult to heat and melt them in the furnace space of the above-mentioned reflecting mirror heating and melting furnace.

In view of the above-mentioned circumstances, the present invention can easily heat and melt substances that are difficult to melt by light or substances that transmit all light, such as substances with low light absorption and powders with high surface reflection. This was done with the purpose of doing so.

[Means for Solving the Problems] In order to achieve the above object, the heating and melting method using light of the present invention uses platinum, iridium, rhodium,
gold, silver, copper, or their alloys;
Alternatively, a light converting material made of tungsten, glass, ceramics, or carbon surrounds the part of the material to be heated placed inside the furnace body to be melted, and the light from the halogen lamp is converted into a double ellipse inside the furnace body. The method is characterized in that the light is focused by a molded reflecting mirror, the focused light is absorbed by the light conversion material, the light conversion material is heated, and the heat radiated by the light conversion material is used to heat and melt the material to be heated. It is said that

Similarly, the light heating and melting device of the present invention includes a halogen lamp provided inside the furnace body,
The above-mentioned bielliptical reflecting mirror is provided inside the furnace body and focuses light from the halogen lamp, and the above-mentioned bielliptic reflecting mirror is formed into a coil shape, a cylinder shape, or a cage shape through which the material to be heated can be inserted. Any of platinum, iridium, rhodium, gold, silver, copper, or an alloy thereof, or any of tungsten, glass, ceramics, or carbon, disposed inside the furnace body so as to surround the light condensing part by It is characterized by comprising a light conversion material consisting of .

[Function] In both the light heating and melting method of the present invention and the light heating and melting apparatus of the present invention, the light of the halogen lamp is focused by a bielliptical reflecting mirror, and the focused light is exposed to the light. The light is absorbed by the light conversion material disposed so as to surround the heating material, and the light conversion material is heated, and the heated material is heated and melted by the heat radiated by the light conversion material.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, in which the same reference numerals as those shown in FIG. 5 indicate the same components.

A light converting material 11 is located near the light condensing part in the furnace core tube 4 so as to be located between the light source of the halogen lamp 3 and the heated material 7 and not to come into contact with either the inside of the furnace core tube 4 or the heated material 7. It is arranged. The light conversion material 11 is used to effectively utilize light in a wavelength range that is not absorbed by the heated material 7 for heating and melting the heated material 7, and has a good light absorption rate (that is, opaque) and a good emissivity. It is necessary that the temperature be higher than the melting point of the material to be heated 7.

The shape of the light conversion material 11 may be a coil shape as shown in FIG. 2A, a cylindrical shape as shown in FIG. 2B, or a cage shape as shown in FIG. iridium, rhodium,
gold, silver, copper, other metals or their alloys,
Possible materials include tungsten, glass, ceramics, and carbon.

Examples of the material to be heated 7 include metals, plastics, fibers, wood, glass, and ceramics (oxides and non-oxides). Examples of oxides include oxides such as silica, alumina, zirconia, ittria, and germania. Any one of these, a mixture of 2 to 4 of these oxides, 2 to 4 of these oxides reacted in advance, or oxides of alkali or alkaline earth metals. One of these oxides or two or more of these oxides
A mixture of four types or a mixture of two to four of these oxides reacted in advance can be used. In addition, as chalcogen compounds, sulfur, selenium, tellurium, arsenic, phosphorus, gallium, germanium, and lead may be used alone or in combination of 2 to 4 of them, or in advance reacted with 2 to 4 of them.As halides, Among metal fluorides, chlorides, bromides, and iodides, a single metal, a mixture of two to four metals, or a mixture of metal fluorides or iodides can be used.

Furthermore, the material to be heated 1 can be molded using a mold or a rubber press, and can be inserted into the inside of the furnace tube 4, and the light conversion material 11
The material to be heated 7 may be shaped and sized so that it does not come into contact with the material, and the material to be heated 7 may be stored in a light-transmissive container instead of being molded.

The light from the halogen lamp 3 is reflected by the bi-elliptical reflector 1
The light passes directly through the furnace tube 4 and is absorbed by the light conversion material 11, and the light conversion material 11 is heated by absorbing the light.
The heated material 7 is heated and melted by the heat radiated by the heated light conversion material 11 and the heat absorbed from the halogen lamp 3, but the heat from the heated material 7
Since there is a synergistic effect in that the heated material 7 is heated by this heat, the thermal efficiency is extremely high.

The spectral distribution of the halogen lamp 3 at a temperature of 3000°K is as shown by the solid line A in Figure 3, and the light conversion material 11
When platinum is used as the material, the energy absorption of light is as shown by the solid line (b), and when the light conversion material 11 is heated, the radiation in the far infrared region is as shown by the solid line (a' in FIG. 4). In addition, when the material to be heated 7 is an infrared transmitting glass, the absorption rate is as shown by the solid line B' in FIG. Therefore, the energy shown in the shaded areas C and C' in FIGS. 3 and 4 is effectively utilized for heating and melting the material 7 to be heated.

As the light conversion material 7, a platinum wire with a wire diameter of 1 mm is used as a 20 mm diameter wire.
The material to be heated 7 contains 65, 25, and 10 mol% of calcium carbonate, gallium oxide, and germanium oxide, respectively, and is formed into a diameter of 10 mm and a length of 50 mm using a rubber press. Ten
A heat-melting experiment was carried out using a bi-elliptical furnace equipped with two 500W halogen lamps and a transparent quartz glass tube as the furnace core tube 4. I went. If the winding pitch of the light conversion material 7 is 5 mm, 20 to 30 seconds after lighting at 1KW, and if the winding pitch is 7 mm, 40 to 50 seconds, 10 mm pitch.
The material to be heated 7 was melted after 60 to 80 seconds.

In this way, in this embodiment, the light from the halogen lamp 3 is focused by the bi-elliptical reflecting mirror 1,
The condensed light is absorbed by the light conversion material 11 arranged so as to surround the heated material 7 and the light conversion material 11 is heated, so that the heated material 7 is easily heated by the heat radiated by the light conversion material 11. It can be heated and melted.

Furthermore, since the portion of the material to be heated 7 surrounded by the light conversion material 11 is heated intensively, the material to be heated 7 can be locally melted.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the method and device for heating and melting using light of the present invention, () Even a material to be heated with poor light absorption can be heated and melted easily and quickly by installing a light conversion material. () The light energy from the light source heats the light conversion material, the heated light conversion material heats the heated material, and at the same time, the heat from the heated material heats the light conversion material. The exchange rate is extremely high. () Since the material to be heated does not need to be placed in a container such as a platinum crucible during heating and melting, impurities will not be mixed into the molten material to be heated, improving product quality. () Since the portion of the material to be heated surrounded by the light conversion material is heated intensively, various excellent effects such as the ability to locally melt the material to be heated can be achieved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of one embodiment of the present invention, Figure 2 A, B, and C are explanatory diagrams of examples of light conversion materials used in the present invention, and Figure 3 is the wavelength and spectral distribution of light from a halogen lamp. Figure 4 shows the relationship between the wavelength of the light conversion material and the relative intensity of the absorption rate, and the relationship between the wavelength of light from the light conversion material and the relative intensity of the absorption rate, respectively. FIG. 5 is a graph showing the relationship between the wavelength and absorption rate of the heated material, and is an explanatory diagram of a conventional example. In the figure, 1 is a bielliptical reflector, 2 is a furnace body, 3 is a halogen lamp, 4 is a furnace tube, 7 is a heated material, 11
indicates a light conversion material.

Claims (1)

[Scope of Claims] 1. The inside of the furnace body is made of platinum, iridium, rhodium, gold, silver, copper, or an alloy thereof, or tungsten, glass, ceramics, or carbon. surrounding the part to be melted of the material to be heated disposed in the
The light from the halogen lamp is focused by a bi-elliptical reflector inside the furnace main body, and the focused light is absorbed by the light conversion material to heat the light conversion material, and the heat emitted by the light conversion material is used to heat the light conversion material. A method of heating and melting using light, which comprises heating and melting the above-mentioned material to be heated. 2. A halogen lamp installed inside the furnace body,
The above-mentioned bielliptical reflecting mirror is provided inside the furnace body and focuses light from the halogen lamp, and the above-mentioned bielliptic reflecting mirror is formed into a coil shape, a cylinder shape, or a cage shape through which the material to be heated can be inserted. Any of platinum, iridium, rhodium, gold, silver, copper, or an alloy thereof, or any of tungsten, glass, ceramics, or carbon, disposed inside the furnace body so as to surround the light condensing part by 1. A heating and melting device using light, comprising: a light converting material made of light.