JPS62849B2 - - Google Patents

Description

Detailed Description of the Invention Conventionally, as a method for producing glass for optical fibers, for example, oxygen containing fine glass powder is fed into the oxygen nozzle of an oxyhydrogen burner and heated to a high temperature by burning it in the oxyhydrogen burner. There is a method of manufacturing a glass soot block by depositing the glass fine powder soot on a target. When trying to make a base material for optical fiber using this method, the following problems arise.

(1) Because natural crystal powder is used as the glass raw material, it is difficult to obtain a low-loss optical fiber base material.

(2) The process of producing natural quartz powder and the process of sending it to an oxyhydrogen burner to deposit a quartz glass block on a target cannot be performed continuously, resulting in poor productivity.

(3) It is difficult to make a SiO ₂ glass block containing a dopant for controlling the refractive index.

As a way to solve these problems, instead of natural quartz, silicon compounds consisting of halides, hydrides, alkylated compounds, or the above silicon compounds containing refractive index controlling dopants (for example, SiCl ₄ , SiHCl ₃ , SiH ₄ , SiH ₂ Cl ₂ , Si
There is a method of making a glass block by feeding a gas (OC ₂ H ₅ ) ₄ , POCl ₃ , BBr _3, etc.) together with an oxidizing gas. (Japanese Unexamined Patent Publication No. 107313/1983). However, this method results in a slow deposition rate of glass blocks and a low deposition yield.

The present invention is a method for manufacturing a glass block that includes a step of reacting a glass composition raw material at a high temperature, in which the glass composition raw material in a liquid phase is pulverized and then subjected to a high temperature reaction. Further, in a recommended embodiment of the present invention, the glass composition raw material is pulverized by a spraying operation. As a result, glass soot blocks can be deposited at extremely high rates and yields and can be produced continuously. Furthermore, since the method of the present invention is a method of turning a glass composition liquid raw material into particles, it is possible to use liquids that have conventionally been impossible to vaporize using vapor phase chemical reaction methods. Furthermore, since it is possible to mix two or more liquids with different vapor pressures and generate a mist of liquid according to the mixing ratio, it is easy to adjust the refractive index composition of the glass block.

Therefore, in addition to the glass base material for optical fibers, the method of the present invention can be applied to crystallized glass, photochromic glass, low melting point solder glass, oxide semiconductor glass, chalcogen glass, oxide glass for infrared optics, It can also be used as a method for producing switch glass, various oxide glasses made from metal alcoholates, ferroelectric crystallized glass, crystallized glass for electro-optics, glass for glass lasers, glass with a glass composition suitable for glass dosimeters, etc. Are suitable.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic diagram of the method for continuously manufacturing the glass soot blocks of the present invention. By sending hydrogen-containing gas into the glass tube 3 from the arrow 4, the glass composition liquid raw material 1 in the container 2 is sucked up inside the glass tube 5 in the direction of the arrow 6, and the liquid coming out from the nozzle 5' is The gas emitted from the nozzle 3' atomizes the particles into mist 11. 10 is a protection tube for suppressing dispersion of the atomized liquid. Reference numeral 9 denotes a hollow sphere for suppressing large particles of atomized liquid from being sprayed from the nozzle 10' and ensuring that particles of uniform diameter are sprayed. The atomized liquid flows down from the hole 16 into the container 2 and is used again as the atomized liquid 1. Atomized atomized liquid 1
1 is mixed with the oxidizing gas fed into the tube 7 from the arrow 8 to the nozzle 7' at the nozzle 10'. Then, the mixed gas containing this atomized liquid is ignited to cause combustion, resulting in a flame 1 containing glass particles.
1'. This flame 11' is sprayed onto a target 12 rotating in the direction of arrow 14 (or in the opposite direction) and moving in the direction of arrow 13, thereby depositing glass soot blocks 15 on the target. A liquid supply device 17 has a function of feeding the liquid 1 into the container 2 so that the liquid level is always constant. Further, if necessary, pressure can be applied while blowing an inert gas onto the liquid surface within the container 2. 18 is a constant temperature bath for controlling the temperature of the liquid 1. The liquid that can be applied to the present invention includes a silicon compound consisting of an alkylate, a halide, or a hydride, the above-mentioned silicon compound containing a refractive index controlling compound, an aqueous solution of an alkali metal silicate, an aqueous solution containing a refractive index controlling compound, or Examples include liquids in which the above compounds are dispersed or dissolved in water or alcohol, and liquids in which solvents and acidic substances are added. for example,
SiCl ₄ , SiHCl ₃ , POCl ₃ , BBr ₃ , GeCl ₄ , Si
(OC ₂ H ₅ ) ₄ , Si(OCH ₃ ) ₄ , PO(OC ₂ H ₅ ) ₃ , B
(OC ₂ H ₅ ) ₃ , M ₂ O・nSiO ₂・xH ₂ O (M is K, Na,
Li, etc.), P ₂ O ₅ aqueous solution, NaCO ₃ aqueous solution, colloidal silica, NaOCH ₃ dissolved in alcohol, or a combination of the above liquids. The gas sent in from the arrow 4 can be a combustible gas such as H ₂ or H ₂ containing at least one inert gas such as Ar, N ₂ , He, or Ne. The gases sent in from arrow 8 are O ₂ , CO ₂ ,
Combustible gases such as NO ₂ , ozone, air, or
The above-mentioned combustion-supporting gas containing at least one inert gas such as Ar, N ₂ , He, and Ne can be used. Furthermore, it may be an oxidizing gas containing the vapor of the silicon compound or the vapor of the silicon compound containing the refractive index controlling dopant. By feeding a gas containing such vapor, it is possible to produce a glass rod base material for an optical fiber suddenly having a refractive index distribution in the radial direction. The tube 3 may be a concentric multiple tube, and in that case, in addition to H ₂ gas, an inert gas may be fed thereinto to adjust the atomizing gas pressure. Note that the minimum required amount of flammable gas such as H ₂ varies depending on the raw material, nozzle shape, etc., but at least the amount that maintains the reaction temperature for oxide production is necessary.
A sufficient amount of combustion supporting gas is also required to react with this.

Example 1 In the apparatus shown in Fig. 1, the inner diameter of the nozzle 3'
0.75mmφ, outer diameter 4mmφ, inner diameter of nozzle 5' 1mm
φ, outer diameter 2mmφ, nozzle 10' inner diameter 10mmφ, outer diameter 12mmφ, nozzle 7' inner diameter 0.7mmφ, outer diameter 3mm
φ, and the outer diameter of the hollow sphere was 6 mmφ. The closer the distance between the nozzle 3' and the nozzle 5' is, the more likely the liquid will be misprinted6.
Since the amount of suction in the direction is good, it was set within 1 mm. The distance between the nozzle 3' and the hollow sphere 9 was approximately 10 mm. Further, the length from the hollow sphere 9 to the nozzle 10' was set to about 30 mm to suppress the flame 11' from spreading in the radial direction. Approximately 100 c.c. of potassium silicate aqueous solution (SiO ₂ /K ₂ O molar ratio 3.41, specific gravity 1.249, trade name: Orka Seal, manufactured by Tokyo Ohka Kogyo) was placed in container 2 (capacity 150 c.c.).
Filled. First, in this state, from only the four arrow directions
An experiment was conducted by flowing H ₂ gas to see how atomized the liquid was injected from the nozzle 10'. If the _H2 gas flow rate is less than 3/mm, liquid 2
was hardly absorbed in the direction of arrow 6 and did not become atomized. When the H ₂ gas flow rate was about 5/mm, the atomization state was reached, and the atomized liquid was injected from the nozzle 10', but the atomization distribution was unstable. When the H ₂ gas flow rate was 8/mm, an extremely stable atomization state was obtained, with a symmetrical mist distribution up to a distance of about 10 cm from the nozzle 10' in the axial direction. In this state, O ₂ gas was flowed at 5/mm from the arrow 8 and ignited at the tip of the nozzle 10'. As a result, extremely fine glass powder was deposited on the target 12 located approximately 10 cm away from the nozzle 10' in the axial direction. Since the liquid was atomized and burned in a mist state by the H ₂ --Om flame, fine glass powder was deposited extremely efficiently. Moreover, a block of several tens of grams of fine glass powder could be obtained in an extremely short period of time (within 60 minutes). Furthermore, as a result of continuously feeding liquid together with N ₂ gas from No. 17, fine glass powder could be deposited stably. Next, in place of the potassium silicate aqueous solution in liquid 1, add ethyl silicate Si (OC ₂ H ₅ ) ₄ 30 c.c., PO (C ₂ H ₅ O) ₃ 30 c.c., ethanol 10 c.c., and water 20 c.c. An experiment similar to that described above was conducted using the mixture of c. As a result, a white finely powdered glass soot block could be deposited on the target. A similar experiment was conducted using SiCl ₄ as liquid 2, but glass soot could be deposited on the target.

Example 2 FIG. 2 shows another example of the glass block manufacturing method of the present invention. In this case, in order to make the radial temperature distribution of the flame more uniform than in the case of FIG. 1, an oxidizing gas nozzle pipe 7' is provided around the outer periphery of the nozzle 10' of the protection tube. A solid ball 9' is used instead of a hollow ball to prevent large particles of atomized liquid from being sprayed from the nozzle 10'. This apparatus is suitable for obtaining glass blocks of large diameter and uniform density.

Example 3 FIG. 3 shows another example of the glass block manufacturing method of the present invention. This is a ring-shaped nozzle portion 5' of a glass tube 5, and a slit 19 for blowing out liquid is provided along the inner circumference of the ring.
By providing the slit 19 along the middle circumference of the ring, the liquid sucked up in the direction of arrow 6 by the atomizing gas is atomized in a conical shape with substantially uniform distribution.

Example 4 FIG. 4 shows an example of the method for manufacturing an optical fiber base material of the present invention. This is a method of depositing a glass block with a refractive index distribution on a target by creating a mist having a concentric double structure distribution with different refractive indexes and generating a flame. That is, the liquid 1 is used for the core of the optical fiber, and the liquid 1' is a liquid whose refractive index is lower than that of the liquid 1. The liquid 1 discharged from the nozzle 5' is first atomized by the atomizing gas and spreads into a conical shape. Next, the liquid 1' discharged from the nozzle 19' is atomized by this gas, and spreads concentrically and conically around the outer circumference of the conically atomized liquid,
It mixes with the oxidizing gas blown out from the nozzle 7' and is burned. As a result, the glass soot block deposited on the target 12 has a refractive index distribution. By adjusting the length ₁ of the protection tube 10 and the distance ₂ from the oxidizing gas introduction tube 7 to the surface of the glass block, it is possible to obtain a step-type refractive index distribution or a focused refractive index distribution. It is possible to do so. This is because the degree of mutual interference between the atomized liquids 1 and 1' and the degree of diffusion of each fine glass powder in the flame change.

The invention is not limited to the above embodiments. For example, a glass soot block may be deposited by combining a plurality of liquid atomizing oxyhydrogen burners shown in FIGS. 1 to 4. In this case, a glass block having a refractive index distribution may be produced by generating flames containing fine glass powder having different refractive indexes from each burner.
Furthermore, in the liquid atomizing oxyhydrogen burner, the oxidizing gas introduction pipe may be removed and used as a simple nozzle, and the atomized liquid blown out from this nozzle may be heated to a high temperature to be used in a method of making glass. . In this case, as the atomizing gas,
Inert or oxidizing gas may be used instead of H ₂ gas. In the apparatuses shown in FIGS. 1 to 4, the direction of the arrow 13 may be directed toward the ceiling or underground, and may also be in the horizontal direction or in the inclined direction. If the tip of the nozzle 5' is cut into a knife edge shape (see the drawing) in the gas blowing direction, the atomized liquid will be jetted in a concentric conical shape, and the atomized liquid within the radial cross section will be The concentration distribution becomes uniform. It is necessary to always replace the unfilled portion of the container 2 with an inert atmosphere in order to prevent explosions. The target on which the glass soot block is deposited may be a hollow glass tube, a glass tube with a bottom, a glass rod, or a glass plate. Then, glass soot blocks may be deposited inside the tube, outside the tube, on the outside of the rod, and on the front and back sides of the plate.
To increase the deposition rate of glass soot blocks, 1
This can be achieved by increasing the inner diameter of the nozzle 5', increasing the flow rate of gas sent from arrow 2 4, increasing the flow rate of inert gas sent from 317, etc.

The moving speed of the target in the axial direction is set to such a value that the distance between the glass soot deposition surface and the nozzle is always approximately constant. The rotational speed of the target may also be in the same range of speeds used in conventional techniques for depositing glass soot on the target;
Usually a few rpm to a few + rpm.

Next, a further improved method of manufacturing the glass soot block described above will be explained. In this method, a glass composition liquid raw material is atomized with a hydrogen-containing gas, mixed with an oxidizing gas, combusted, and the flame is sprayed onto a target to deposit a glass block for optical fiber. , a method for manufacturing a glass soot block, characterized in that an inert gas is passed between the hydrogen-containing gas and the oxidizing gas.

In the explanation so far, the present inventor atomizes the glass composition liquid raw material with a hydrogen-containing gas, and then
We proposed a method of depositing glass soot blocks by mixing it with oxidizing gas, burning it, and spraying the flame onto a target. This method has the advantage that glass soot blocks can be deposited at high speeds and yields, and can be produced continuously. However, when a glass composition liquid raw material with a low boiling point is continuously used for a long period of time, the outlet of the nozzle for blowing out the atomized glass composition liquid raw material conveyed by hydrogen-containing gas gradually becomes clogged with glass fine powder. However, there was a problem that the deposition conditions of the glass soot block changed. This is because hydrogen and oxygen are mixed at the outlet of the nozzle for blowing out the atomized glass composition liquid raw material, and the nozzle outlet is heated to a high temperature for combustion.As a result, the glass composition liquid raw material has a low boiling point. It is thought that the glass particles react and become fine glass powder, which adheres to the nozzle outlet.

The present improved method provides a method in which fine glass powder does not adhere to the nozzle outlet and clogging does not occur in the above method. That is, using concentric triple-pipe structure nozzles, the atomized glass composition liquid raw material carried by hydrogen-containing gas is blown out from the central nozzle, and the oxidizing gas is blown out from the outer nozzles. , and by flowing inert gas from the nozzle in the middle between the center and the outer part, the combustion of oxygen and hydrogen is carried out in a space in front of the triple tube nozzle and separated by a certain distance in the gas flow direction. This method is characterized in that it is performed by As a result, a glass block for optical fiber can be deposited continuously and extremely stably over a long period of time even when using a liquid raw material for a glass composition having a low boiling point. This improved method will be explained in detail below using examples.

Example 5 FIG. 5 shows an example of the glass block manufacturing method of the present invention. This is done by feeding hydrogen-containing gas into the tube 3 from the direction of the arrow 4, sucking up the glass composition liquid raw material 1 in the container 2 through the tube 5 in the direction of the arrow 6, and the liquid coming out from the nozzle 5' into the nozzle 3. It is made into atomized mist 11 by the gas emitted from '.
This atomized liquid 11 is injected from the nozzle 10' of the tube 10 and ignited at the nozzle outlet to generate a flame containing glass soot. Then, when an oxidizing gas is fed into the tube 7 from the direction of the arrow 8 and blown out from the nozzle 7', the hydrogen and oxygen are combusted to form a high temperature flame (containing glass soot). However, because hydrogen and oxygen are mixed and burned at the nozzle exit, the nozzle exit becomes hot (over 500℃).
Glass soot accumulates on the inner wall surface of the nozzle 10' and causes clogging. Therefore, at the same time as hydrogen is flowing from the direction of arrow 4, an inert gas (for example, a gas containing at least one of N ₂ , Ar, He, Ne, etc.) is caused to flow from the direction of arrow 21 into the tube 20, and this state is If the oxidizing gas is ignited at the nozzle outlet and then flowed from the direction of arrow 8, hydrogen and oxygen will be generated in the space in the gas flow direction in front of the nozzle outlet (from the A-A' plane to the direction of arrow 24). The nozzle outlet is not hot to the touch and does not become clogged. Moreover, depending on the flow rate value of the inert gas, the hydrogen and oxygen unmixed region 23
Since the range of can be adjusted, no glass soot will adhere to the nozzle outlet. 11' is a flame containing glass soot, 15 is a glass soot block,
12 is a target that moves in the direction of arrow 13 while rotating in the direction of arrow 14; 17 is a continuous supply device for the glass composition liquid raw material; and 22 is an inert gas for applying pressure to the surface of the glass composition liquid in the container 2. The supply device 18 is a constant temperature bath for adjusting the temperature of the glass composition liquid raw material, and 16 is a hole through which the atomized liquid collides with the wall surface of the tube 10 and flows down into the container 2 again. The gas sent in from the arrow 8 is a combustion-supporting gas such as O ₂ as described above. If the combustion-supporting gas containing glass raw material vapor is used as the gas fed in from the arrow 8, a so-called optical fiber preform having a refractive index distribution in the radial direction from the center of the glass block can be produced. For example, if you use liquid Si(OC ₂ H ₅ ) ₄ for 1 and feed O ₂ gas containing vapors of B(OC ₂ H ₅ ) ₃ and Si(OC ₂ H ₅ ) ₄ from arrow 8, the core will be The SiO ₂ cladding becomes an SiO ₂ optical fiber preform containing B ₂ O ₃ . A specific example of FIG. 5 will be described. The triple tube was made from quartz glass. Center nozzle 1
0' inner diameter 15mm, outer diameter 16.7mm, middle nozzle 20' inner diameter 18mm, outer diameter 19.6mm outer nozzle 7' inner diameter 20.5
mm, outer diameter 23.3mm. Si(OC ₂ H ₅ ) ₄ was used as the glass composition liquid raw material 1 and kept at 20° C. in a constant temperature bath 19. A liquid of Si(OC ₂ H ₅ ) ₄ is supplied from 17 so that the liquid level is always constant in the container 2, and
_N2 gas was blown onto the liquid surface at a rate of 1/mm. In this state, H ₂ gas was flowed at 10/mm from arrow 4 to inject the atomized liquid 11 from the nozzle outlet, and at the same time, N ₂ gas was flowed from arrow 21 at 1.0/mm to ignite at the nozzle exit. After that, O ₂ gas was flowed 5/mm from arrow 8 to flame 11' containing glass soot.
occurred. As a result, the area 23 where hydrogen and oxygen were not mixed was approximately 5 mm. Next, in this state, the flow rate of N ₂ gas sent in from the arrow 21 was set to 3/mm, and as a result, the area 23 where hydrogen and oxygen were not mixed became about 10 mm. In either case, the nozzle outlet was not hot to the touch. In this state, place a quartz target with a diameter of 80 mm 15 cm in front of the nozzle for approximately 2 seconds.
Time glass soot deposition was carried out. As a result, about 80 g of SiO ₂ glass soot could be deposited on the target 12, and no glass soot adhered to the nozzle outlet. Also, instead of Si(OC ₂ H ₅ ) ₄ , K ₂ O・nSiO ₂・x ₂ H ₂ O (SiO ₂ /K ₂ O molar ratio
3.41, specific gravity 1.249, trade name Orcaseal, manufactured by Tokyo Ohka Kogyo), but no glass soot adhered to the nozzle outlet.

Next, add Si(OC ₂ H ₅ ) ₄ 300c.c. and PO to liquid 1.
A mixed solution of (OC ₂ H ₅ ) ₃ and 70 c.c. was used, and a glass block 15 was deposited by spraying the liquid in the form of a mist from the nozzle 10' at a rate of 200 c.c./hr. the result,
Glass blocks could be deposited at a rate of about 47 g/hr. This glass block was placed in a He gas atmosphere.
As a result of keeping it at 1250℃ for about 1 hour, we were able to obtain transparent glass. The refractive index of this glass was measured using an Atsube refractometer and was found to be nd=1.4625. Next, add Si(OC ₂ H ₅ ) ₄ 200c.c. and PO to liquid 1.
(OC ₂ H ₅ ) ₃ Using a mixed solution of 200c.c., a glass block and glass were made in the same manner as above.
The refractive index of the glass was nd=1.4658. We also measured the infrared spectral characteristics of this glass and calculated the water content from the absorption peak value around 2.7 μm.
The amount was 5.6 ppm, which was an extremely low value. Next, add Si(OC ₂ H ₅ ) ₄ 100 c.c. and PO to liquid 1.
(OC ₂ H ₅ ) ₃ Using a mixed solution of 300 c.c., a glass block and glass were made in the same manner as above.
The refractive index of the glass was nd=1.4673. In this way, it has become clear that the refractive index can be easily changed by increasing the amount of the refractive index controlling dopant. Next, by setting the amount of liquid sprayed from the nozzle 10' to 300 c.c./hr, it was found that glass soot blocks could be deposited at a rate of about 62 g/hr.

Example 6 FIG. 6 shows another example of the method for manufacturing a glass soot block of the present invention. In this case, the direction of movement of the target (direction of arrow 13) is directed underground, which is opposite to the direction of movement (direction of the ceiling) in the case of FIG. In this case, in addition to not causing clogging, the deposition rate of the glass soot blocks can be made faster than in the case of FIG. This is because all of the atomized liquid is ejected from the nozzle.

Example 7 FIG. 7 shows another example of the method for manufacturing a glass soot block of the present invention. This consists of two incompatible glass composition liquid raw materials 1 and 1'.
In this method, a glass soot block 15 containing a refractive index controlling dopant is deposited by using a dopant. First, the liquid 1 is made into an atomized state by the gas sent from the direction of the arrow 4, and then the liquid 1' is made into the atomized state by the gas sent from the direction of the arrow 26 and the gas containing the atomized liquid. Center nozzle 1 of heavy pipe nozzle
Inject from 0'. Then, a flame containing glass soot is generated in the same manner as in the case of Fig. 5,
This method involves depositing glass soot containing a refractive index controlling dopant on a target. The gas sent in from arrow 26 may be the same as the gas sent in from arrow 4, or may be an inert gas such as N ₂ , Ar, He, or Ne. 27 is an arrow indicating the outflow direction of the liquid. In this case, the arrow 13 may be directed toward the ceiling or underground. However, when the arrow 13 points underground, the exit portion of the arrow 27 is closed.
For example, SiCl ₄ is used for the liquid 1, and PO(O ₂ H ₅ O) ₃ or B(C ₂ H ₅ O) ₃ is used for the liquid 1'. The refractive index of the glass soot block 15 can be adjusted by adjusting the flow rate of gas sent from the directions of arrows 4 and 26;
In addition to the temperature of the constant temperature bath, an inert gas supply device 22,
This can be done by controlling the flow rate of gas sent from 22'. The method of the invention comprises H ₂
The flow rate of O 2 and O ₂ gas is mainly adjusted to set the flame temperature, and the refractive index of the glass block and the deposition rate of the glass block are controlled by the inert gas supply device 2.
It is characterized in that it is determined by adjusting the gas flow rate sent from 2 and 22'.

Example 8 FIG. 8 shows another example of the method for manufacturing an optical fiber base material of the present invention. This is a method of depositing a glass block containing a refractive index controlling dopant as in the case of FIG. The liquids 1 and 1' are simultaneously sucked up and atomized by the gas fed in from the direction of the arrow 4, and then injected from the central nozzle 10' of the triple tube nozzle.

FIG. 9 shows an embodiment of the optical fiber preform manufacturing method of the present invention. This is a modification of FIG. 5, and is a method for generating a large amount of glass soot in a single period of time. That is, by bringing the nozzles 3' and 5' near the triple tube nozzle outlet, the arrow 6
The liquid 1 sucked up in the direction is efficiently injected to the nozzle outlet.

Triple tube nozzle and tube 3, 7, 20, 10,
5, 5'' and the containers 2, 2' may be made of glass (for example, quartz, Vycor, Pyrex, etc.), porcelain (for example, alumina), or metal such as stainless steel.The center nozzle 10 of the triple tube nozzle If the inner diameter of the nozzle is less than 3 mm, the liquid adhering to the inner wall of the tube will gradually become larger droplets and will be easily sprayed from the nozzle.If the inner diameter of the nozzle is small, reduce the flow rate of gas sent from the direction of the arrow 4. The amount of liquid sprayed can be reduced.

In the case of FIGS. 6 to 8 as well, the gas fed from the arrow 8 is glass raw material (for example, SiCl ₄ , SiH ₄ ,
Combustion-supporting gases (such as O ₂ , CO ₂ , N ₂ O, etc.) containing vapors such as BBr ₃ , GeCl _{4 ,} etc.) can be used.
Therefore, the optical fiber base material of the present invention includes glass rods having various refractive index distribution structures such as step type and convergent type.

Although the explanation so far has mainly been about the method of manufacturing a glass soot block for optical fiber, the method of the present invention is not limited thereto. For example, _Li2O4 ~5%, _Al2O3 25~35%, _SiO2 60 _~ 70
% as the main component and TiO ₂ as a crystal nucleating agent,
Crystallized glass containing a small amount of P ₂ O ₅ and ZrO ₂ ,
Crystallized glass that deposits ferroelectric crystals such as BaTiO ₃ and PbTiO ₃ ; crystallized glass for electro-optics that maintains transparency by depositing ferroelectric NaNbO ₃ crystals;
SiO ₂ 59, BaO 25, K ₂ O 15, Sb ₂ O ₃ 1 (wt%),
Glass laser with 1-6% Nd ₂ O ₃ added, photochromic glass with Ag, Cl, Br added into the glass, solder to seal the glass, or applying phosphor or pigment to the glass. Low melting point solder glass as binder, glass composition materials as NaPO ₃ , NaPO ₄ , Al(PO ₃ ) ₃ , AgPO ₃
Fluorescent glass dosimeter glass, including oxide semiconductor glass (e.g.
TiO ₂ ―B ₂ O ₃ ―BaO), S, Se,
Needless to say, this method can also be applied to manufacturing methods such as chalcogen glass containing Te, infrared optical glass, switch glass, and even glass made from metal alcoholates.

[Brief explanation of the drawing]

1 to 9 are sectional views showing the main parts of an apparatus used in an embodiment of the method for manufacturing a glass block according to the present invention. In each figure, 1 is a glass composition liquid raw material, 2 is a container, 3' is a nozzle, 4 is a flammable gas introduction direction,
5' is a nozzle, 6 is a suction direction of liquid raw material, 8 is a combustion-supporting gas introduction direction, 10' is a nozzle, 11 is atomized liquid raw material, 11' is a flame, 12 is a target,
15 is a glass soot block, 17 is a continuous supply device for liquid raw materials, 21 is an inert gas introduction direction, and 22 is a gas supply device that applies pressure to the liquid surface.

Claims (1)

[Scope of Claims] 1. A liquid raw material for a glass composition is atomized by atomizing a gas containing hydrogen, mixed with a gas containing an oxidizing gas and combusted to generate a flame, and the flame is directed onto a target. A method for producing a glass block, characterized in that glass soot is deposited on a target by blowing the soot onto the target. 2. The method for manufacturing a glass block according to claim 1, wherein the glass composition liquid raw material is comprised of one or more types of liquid raw materials.