JP2002001514A - Injection nozzle and apparatus for quenching melt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molten metal injection nozzle capable of preventing generation of cast cavity defects in manufacturing amorphous alloy bulk material by means of a method of rapid cooling of melt into casting mold using a melt quenching apparatus. SOLUTION: A piston capable of sliding in a quartz tube is installed at the rear portion of mother alloy charged in the quartz tube having a nozzle hole at its one end. The piston slides towards the mother alloy side by being pressurized from the side opposite to the base alloy side in the tube by inert gas and thus the molten base alloy is injected from the nozzle hole. After the finish of the injection of the molten alloy, the piston closes the nozzle hole thus avoiding leakage of inert gas from the hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray nozzle for spraying a material, and a liquid quenching apparatus using the spray nozzle.

[0002]

2. Description of the Related Art An amorphous alloy is an amorphous alloy that does not have a crystal structure as its name implies, and is superior in corrosion resistance because it is amorphous compared to ordinary crystalline metal materials. In addition, there is a characteristic of having high hardness and strength. In recent years, attention has been paid to these characteristics, and applications in various fields are expected or developed.

[0003] An amorphous alloy is usually an alloy composed of multiple elements, which is an alloy in which the arrangement of atoms is solidified in a liquid state in which the arrangement of atoms is irregularly disordered. There is no amorphous alloy.

As a method of producing such an amorphous alloy, a method of melting a crystalline multi-element alloy into a liquid state and forcibly quenching at once from a liquid state in which the atomic arrangement is irregularly disordered is generally employed. It is adopted. That is, depending on the quenching from the liquid state, the irregularly disordered atomic arrangement shifts to a regular arrangement and crystallizes, and does not give hair while maintaining the irregularly disordered atomic arrangement. It is hardening in an instant.

[0005] However, in reality, it does not mean that an amorphous alloy can be obtained by melting any multi-element alloy and forcibly quenching it from a liquid state at once, but depending on the combination and composition ratio of the elements of the multi-element alloy. Some multi-element alloys tend to be amorphous alloys, while others are difficult to become amorphous alloys. By the way, as a typical example of a multi-element alloy which can easily become an amorphous alloy or which can become an amorphous alloy, a zirconium-based amorphous alloy (composition: zirconium 55 at%, aluminum 10 at%, nickel 5 at%, copper 30 at%)
And palladium-based amorphous alloys (composition: palladium 40 at%, copper 10 at%, nickel 10 at%, phosphorus 20 at%) and the like are known.

[0006] Generally, amorphous alloys are produced in the form of a ribbon ribbon made by a single-roll liquid quenching method or a bulk material made by a mold liquid quenching method.

[0007] Regarding the former single-roll liquid quenching method for producing a ribbon material, "Solid Physics" published on September 30, 1986 by Agne Technical Center Co., Ltd.
&"Metal Physics Seminar" Special Issue on Amorphous Alloys, 1986 Special Issue: A guide to the preparation of amorphous alloys. For a detailed description of the single roll liquid quenching method,
See the book above.

In the following, the latter, the mold liquid quenching method for producing a bulk material, will be described in detail according to the working procedure.

In the first step, a plurality of elements are melted using a high-frequency induction electric furnace or an arc melting device, and the plurality of elements are uniformly mixed, then cooled and solidified.
Make a mother alloy. Note that the high-frequency induction electric furnace or the arc melting apparatus used here does not have means for forcibly and rapidly cooling the melted sample. Therefore, the cooling here is cooling with a slow cooling rate due to natural heat radiation. Therefore, at the stage of the mother alloy state produced here, the alloy is not an amorphous alloy yet, but a crystalline alloy in which the atomic arrangement has shifted to a regular arrangement.

[0010] Incidentally, even in the case of producing a ribbon material by a single roll liquid quenching method, as described above,
First, a mother alloy is manufactured in the same manner.

The following is a step of amorphizing the crystalline master alloy produced in the above-mentioned steps to form a bulk material of the amorphous alloy, which will be described with reference to the drawings.

FIG. 2 is a schematic explanatory view of a liquid quenching device generally used for making an amorphous alloy by making a crystalline mother alloy amorphous. Master alloy 11 to be made amorphous
Is placed in the quartz tube nozzle 12. A nozzle hole 12b is provided at the lower end of the quartz tube nozzle 12. The upper end of the quartz tube nozzle 12 communicates with the inert gas introduction port 12a of the liquid quenching device, and is attached to the inert gas introduction port 12a. A high-frequency induction coil 13 of a high-frequency induction electric furnace is provided on an outer peripheral portion of the quartz tube nozzle 12. Further, in the lower part of the nozzle hole 12b,
A copper mold 14 is arranged. Then, all of the above items are contained in the chamber 15. Chamber 1
5, a vacuum port 16 and an inert gas introduction port 17 are provided.

In the liquid quenching apparatus shown in FIG. 2, a casting operation is performed according to the following operation procedure to make the mother alloy 11 amorphous, that is, to produce an amorphous alloy. First,
The inside of the chamber 15 is evacuated to a vacuum by a vacuum pump (not shown) connected to the vacuum port 16. After the evacuation is completed, a small amount of an inert gas that is sufficient to maintain the pressure in the chamber 15 at a negative pressure is introduced into the chamber 15 from the inert gas introduction port 17 and the chamber 1
5 is adjusted to a negative pressure inert gas atmosphere. Chamber 1
After the adjustment of the pressure and atmosphere in 5 is completed, a current is supplied to the high-frequency induction coil 13 to heat and melt the mother alloy 11 contained in the quartz tube nozzle 12. When the melting of the master alloy 11 is completed, an inert gas is introduced at an appropriate pressure from the inert gas introduction port 12a to pressurize the inside of the quartz tube nozzle 12, and the molten mother alloy 11 is removed from the nozzle hole 12b. It is injected and cast into the mold 14.

The reason why the inside of the chamber 15 is adjusted to a negative pressure inert gas atmosphere in the above-described operation procedure is to prevent the mother alloy 11 from being oxidized in the process of heating the mother alloy 11. It is.

The molten mother alloy 11 cast into the mold 14 by the above-described operation procedure is rapidly cooled by contact with the mold 14 and rapidly cooled to maintain the irregularly disordered atomic arrangement. Instantly as it is, it solidifies into the same shape as the cavity (not shown) of the mold 14, and becomes an amorphous alloy having no crystal structure. That is, a bulk material of an amorphous alloy having the same shape as the cavity (not shown) of the mold 14 is produced.

Although the cavity of the mold 14 is not shown in FIG. 2, the mold 14 is provided with a cavity whose shape is inverted from that of a desired bulk material, and the melted mother material is provided. The alloy 11 is rapidly cast.

That is, as a method for producing a bulk material of an amorphous alloy, a crystalline mother alloy 11 is rapidly cooled and cast into an amorphous amorphous alloy, and at the same time, the cavity shape of the mold 14 is transferred. That is, a desired external shape is provided.

Here, the mold 14 is made of copper as described above, because copper has good thermal conductivity and rapidly removes heat from the molten mother alloy 11 to rapidly cool it. Because it is suitable for. This is because cooling more rapidly leads to instantaneous solidification while maintaining the disordered arrangement of atoms, and this quenching is important and necessary condition for producing an amorphous alloy.

Further, although not shown in FIG.
As a means for more rapid cooling, a channel for passing cooling water in the mold 14 is provided, as in the case of
A method of cooling the mold 14 with water is often employed. Alternatively, increasing the heat capacity of the mold 14 by increasing the size of the mold 14 or adopting a means for increasing the cooling rate may be employed.

The bulk material of the amorphous alloy is generally manufactured by the method described above.

[0021]

As described above, in the prior art, the bulk material of the amorphous alloy is manufactured by quenching casting using the liquid quenching apparatus shown in FIG. Specifically, after the mother alloy 11 is melted, an inert gas is introduced at an appropriate pressure from the inert gas introduction port 12a to pressurize the inside of the quartz tube nozzle 12 to thereby melt the molten mother alloy 11. Is injected from the nozzle hole 12 b to cast the mother alloy 11 into the mold 14.

However, in the quenching casting by the liquid quenching apparatus shown in FIG. 2 of the prior art described above, there is a problem that pores, that is, porosity, which is a casting defect, often occurs in the bulk material of the cast amorphous alloy. Was.

The cause of the above-mentioned void defects is that the mold 14
Immediately after the mother alloy 11 is completely injected from the quartz tube nozzle 12 when the mother alloy 11 is cast into the
The inert gas spouts toward the gate (not shown) of the mold 14 from the mold. That is, the moment when the mother alloy 11 cast into the mold 14 is solidified, an inert gas enters the unalloyed mother alloy 11 from a gate (not shown) of the mold 14. This results in the formation of air bubbles, which results in a void defect.

Therefore, this void defect causes the nozzle hole 1 when the molten mother alloy 11 is cast into the mold 14.
In the vicinity of the gate (not shown) of the mold 14 immediately below the mold 2b, there is a problem that the occurrence is particularly large.

Accordingly, the present invention has been made in view of such a problem, and an object of the present invention is to provide a method for manufacturing a quartz tube nozzle 12 when casting a mother alloy 11 into a mold 14.
Immediately after the mother alloy 11 is injected from the inside, the nozzle hole 12b
To provide a molten metal spray nozzle in which no inert gas is blown out toward a gate (not shown) of the mold 14.

That is, it is an object of the present invention to provide a molten metal injection nozzle capable of preventing occurrence of a cavity defect when producing a bulk material of an amorphous alloy by a mold liquid quenching method using a liquid quenching device. .

[0027]

In order to achieve the above object, the molten metal spray nozzle of the present invention employs the following means.

The injection nozzle according to claim 1 of the present invention has a nozzle hole at one end and a gas introduction port at the other end.
A tubular injection nozzle for injecting a liquid filled in a hollow body from a nozzle hole by a gas introduction pressure, wherein an inner diameter of a hollow body of the tubular injection nozzle is between a gas introduction port and the liquid in the tubular injection nozzle. It is characterized by having a piston that can fit and slide inside the tubular injection nozzle.

The injection nozzle according to claim 2 of the present invention injects a mother alloy melted in a quartz tube nozzle having a nozzle hole at a tip from a nozzle hole of the quartz tube nozzle toward a cooling medium, A quartz tube nozzle for use in a liquid quenching device for producing an amorphous alloy by quenching a mother alloy from a liquid state, wherein the quartz tube nozzle is fitted behind the mother alloy in the quartz tube nozzle with the inner diameter of the quartz tube nozzle. A piston slidable in the tube nozzle is provided.

[0030] In the injection nozzle according to the third aspect of the present invention, the piston is pressurized with an inert gas on the back side opposite to the side on which the master alloy is located so that the mother alloy is formed inside the quartz tube nozzle. The liquid crystal mother alloy is pressurized by being slidably driven to the side to be positioned, and the liquid state mother alloy is pushed out from the nozzle hole of the quartz tube nozzle to the outside of the quartz tube nozzle to be jetted.

In the injection nozzle according to the fourth aspect of the present invention, after injecting the mother alloy in a liquid state, the piston shields the nozzle hole of the quartz tube nozzle, and the piston blocks the nozzle hole of the quartz tube nozzle. It is characterized by preventing ejection of an inert gas.

The liquid quenching apparatus for producing an amorphous alloy according to claim 5 of the present invention is characterized in that,
It is characterized by having the injection nozzles described in 3 and 4.

(Operation) The piston in the injection nozzle of the present invention slides in the injection nozzle toward the liquid to be injected by using the gas pressure introduced from the gas introduction port as a drive source. Depending on the sliding drive of the piston, the liquid is pressurized and the liquid is ejected from the nozzle hole. After injecting the liquid, the piston blocks the nozzle hole. This prevents the gas introduced into the ejection nozzle for ejecting the liquid from being ejected from the nozzle hole.

When a master alloy of an amorphous alloy is cast into a mold by the liquid quenching apparatus for preparing an amorphous alloy equipped with the injection nozzle of the present invention, immediately after the mother alloy in the liquid state is injected from the injection nozzle, the nozzle The hole is blocked by the piston. As a result, the inert gas is prevented from escaping from the nozzle hole toward the gate of the mold, and the inert gas does not enter the unsolidified master alloy at the moment of casting. . Therefore, since bubbles made of an inert gas are not formed in the master alloy, the problem that a void defect occurs is solved.

[0035]

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

(First Embodiment) FIG. 1 is an explanatory view of a molten metal injection nozzle 18 according to the present invention. FIG. 1 shows a state in which it is attached to an inert gas introduction port 12a of a liquid quenching device, similarly to the quartz tube nozzle 12 of FIG.

The molten metal spray nozzle 1 shown in FIG.
2, a high-frequency induction coil for heating and melting the mother alloy 11 is naturally installed similarly to the outer circumference of the quartz tube nozzle 12 in FIG. A high-frequency induction coil 13 is provided on the outer periphery of 18. However, in FIG.
In order to clarify the illustration, the illustration of the high-frequency induction coil is omitted.

FIG. 1A shows a master alloy 11 to be made amorphous.
FIG. 2 is a molten metal spray nozzle 18 in which
In the same manner as the quartz tube nozzle 12, the liquid quenching device is attached to the inert gas introduction port 12a.

In the present embodiment, the master alloy 11
Is zirconium 55at%, aluminum 10at
%, 5 at% nickel, and 30 at% copper, a zirconium-based crystalline alloy having the same composition after casting as a zirconium-based amorphous alloy.

At the lower end of the molten metal spray nozzle 18, a nozzle hole 18b is provided. Behind (upper part) the mother alloy 11 housed in the molten metal injection nozzle 18, it has an outer diameter that fits the inner diameter of the molten metal injection nozzle 18, and slides inside the molten metal injection nozzle 18 in the arrow Y direction. A possible piston 19 is arranged.

FIG. 1B shows a state in which a current is applied to a high-frequency induction coil (not shown) from the state of FIG. 1A to heat the mother alloy 11 contained in the molten metal injection nozzle 18 to 900 ° C. 3 shows a state where the mother alloy 11 is melted.

The master alloy 11 is in a liquid state, and has melted down at the lower part of the molten metal injection nozzle 18. In addition, mother alloy 1
In conjunction with the melting of 1, the piston 19 also slips downward in the molten metal injection nozzle 18 and shifts its position onto the melted mother alloy 11.

In order to produce a bulk material of an amorphous alloy, an inert gas is introduced at an appropriate pressure from the inert gas introduction port 12a in the state shown in FIG.
The back of the piston 19 is pressurized with an inert gas. Then
The piston 19 is slidably driven downward in the molten metal injection nozzle 18 by using the pressure of the inert gas as a driving force so that the master alloy 11 is located, so that the mother alloy 11 in the liquid state is moved through the nozzle hole 18b.
And extrude. Then, the mother alloy 11 in a liquid state sprayed from the nozzle holes 18b is cast into a mold (not shown), rapidly solidified in the mold, and a bulk material of an amorphous alloy is obtained.

The master alloy 11 in this embodiment is a zirconium-based crystalline alloy having a composition of 55 at% of zirconium, 10 at% of aluminum, 5 at% of nickel, and 30 at% of copper. Therefore, in the present embodiment,
That is, a bulk material of a zirconium-based amorphous alloy having the same composition as described above can be obtained.

FIG. 1C shows a state after the mother alloy 11 has been injected. As a result of sliding movement inside the molten metal injection nozzle 18, the piston 19 is located at the lowermost position within the molten metal injection nozzle 18, and the nozzle hole 18 b
Has been shielded by the piston 19.

In the state shown in FIG. 1C in which the nozzle hole 18b is shielded by the piston 19 as described above, the inert gas introduced into the molten metal injection nozzle 18 for injecting the mother alloy 11 receives the inert gas. Ejection from 18b will be blocked.

Therefore, if the mother alloy 11 is cast into a mold using the molten metal injection nozzle 18 of the present embodiment, the mother alloy 11 is injected from the molten metal injection nozzle 18,
It is possible to prevent the inert gas from spouting from the nozzle hole 18b toward the gate (not shown) of the mold. That is, the moment when the master alloy 11 cast into the mold is solidified, but the master alloy 11 that has not completely solidified is present.
That is, it is possible to prevent an inert gas from entering from a gate (not shown) of the mold to form bubbles and to cause a void defect.

Thus, according to the present embodiment, a bulk material of a zirconium-based amorphous alloy having no voids was produced.

In the prior art, there was a problem that porosity defects occurred frequently near the gate of the mold. However, in the present embodiment, this problem has been solved as a matter of course.

As described above, in the present embodiment, after the mother alloy 11 is injected from the molten metal injection nozzle 18, the inert gas is not injected from the nozzle hole 18 b toward the gate of the mold. A metal spray nozzle was provided, resulting in a good quality amorphous alloy bulk material with no voids.

In the first embodiment, the material of the piston 19 is quartz as in the case of the molten metal injection nozzle 18. However, the material of the piston 19 may be any other material as long as the material has heat resistance enough to withstand melting of the mother alloy 11. The material of the piston 19 is not limited to quartz.

In the first embodiment, the piston 19 has a cup-like shape having an opening at the rear end face. More specifically, the tip of the piston 19 has a conical shape so that it fits inside the tip of the molten metal injection nozzle 18. Further, the body side portion of the piston 19 has a straight shape in which the outer diameter is fitted to the inner diameter of the molten metal injection nozzle 18 so that the piston 19 slides inside the molten metal injection nozzle 18 without rattling and is smooth. Slidable. However, the shape of the piston is not limited to the shape of the piston 19 shown in the above-described first embodiment. In the state of FIG. 1C, that is, the state after the injection of the master alloy 11,
Any shape may be used as long as it can shield the nozzle hole 18b. As long as the nozzle hole 18b can be blocked by the piston and the injection of the inert gas from the nozzle hole 18b can be blocked, the shape of the piston may be any other shape. For example, as another shape of the piston, a spherical shape having an outer diameter that fits with the inner diameter of the molten metal injection nozzle 18 may be used. In the first embodiment described above, an injection nozzle for producing an amorphous alloy is shown as an injection nozzle, but the present invention is not limited to this, and can be applied to a wide variety of materials. It can be applied to an injection nozzle for injecting. For example, the present invention can be applied to a spray nozzle for spraying a ceramic material or an organic material.

[0053]

As is apparent from the above description, the molten metal injection nozzle of the present invention transfers the mother alloy melted in a quartz tube nozzle having a nozzle hole at the tip from the nozzle hole of the quartz tube nozzle to the cooling medium. A quartz tube nozzle used for a liquid quenching device for producing an amorphous alloy by quenching the mother alloy from a liquid state, and the inside of the quartz tube nozzle behind the mother alloy in the quartz tube nozzle. And a piston slidable in the quartz tube nozzle.

Further, in the molten metal injection nozzle according to the present invention, the piston is pressurized with an inert gas on the back side opposite to the side on which the master alloy is located, whereby the mother alloy is located inside the quartz tube nozzle. Sliding drive to the side,
The mother alloy in the liquid state is pressurized, and the mother alloy in the liquid state is extruded from the nozzle hole of the quartz tube nozzle to the outside of the quartz tube nozzle and injected.

Further, in the molten metal injection nozzle according to the present invention, after injecting the mother alloy in a liquid state, the piston shields the nozzle hole of the quartz tube nozzle, and the inert gas from the nozzle hole of the quartz tube nozzle is blocked. Prevents gas from escaping.

Therefore, according to the molten metal injection nozzle of the present invention, when the mother alloy is cast into the mold, immediately after the mother alloy is injected from the quartz tube nozzle, the inert gas is injected from the nozzle hole into the mold. A molten metal spray nozzle that does not blow out toward the gate of the molten metal can be provided.

That is, it is possible to provide a molten metal injection nozzle capable of preventing the occurrence of a cavity defect when producing a bulk material of an amorphous alloy by a mold liquid quenching method using a liquid quenching device. .

Therefore, according to the molten metal injection nozzle of the present invention, it is possible to produce an amorphous alloy bulk material in which the occurrence of a porosity defect is prevented, and it is possible to provide a high quality amorphous alloy bulk material having no porosity defect. Becomes

[Brief description of the drawings]

FIG. 1 is an explanatory view of a molten metal injection nozzle according to the present invention.

FIG. 2 is a schematic explanatory view of a general liquid quenching apparatus for producing an amorphous alloy.

[Explanation of symbols]

 Reference Signs List 11 mother alloy 12 quartz tube nozzle 12a inert gas introduction port 12b nozzle hole 13 high frequency induction coil 14 mold 15 chamber 16 evacuation port 17 inert gas introduction port 18 molten metal injection nozzle 18b nozzle hole 19 piston

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masahiro Sato 840 Takeno, Shimotomi, Tokorozawa-shi, Saitama F-term in Citizen Watch Co., Ltd. Technical Research Institute 4E004 DB17

Claims (5)

[Claims] An injection nozzle having a nozzle hole at one end and a gas introduction part at the other end, and injects a material filled in a hollow body from the nozzle hole by gas introduction pressure, wherein the gas introduction part in the injection nozzle is provided. An injection nozzle having a piston that fits with the inner diameter of the hollow body of the injection nozzle and is slidable in the injection nozzle. 2. Injecting a mother alloy melted in a nozzle having a nozzle hole at the tip toward a cooling medium from the nozzle hole,
An injection nozzle used for a liquid quenching device for producing an amorphous alloy by quenching a mother alloy from a liquid state,
An injection nozzle having a piston that moves in conjunction with the state of a mother alloy in the nozzle, fits into the inner diameter of the nozzle, and can slide in the nozzle. 3. A material or a master alloy is filled between a nozzle hole and a piston, and the piston is pressurized with an inert gas from a gas introduction portion side to move the inside of the nozzle from the gas introduction portion side to the nozzle hole side. The injection nozzle according to claim 1 or 2, wherein the injection nozzle slides toward to pressurize the material or the mother alloy, and extrudes and ejects the material or the mother alloy from the nozzle hole to the outside of the nozzle. 4. The method according to claim 1, wherein the piston blocks the nozzle hole after injecting the material or the master alloy.
The injection nozzle according to any one of claims 1 to 3. 5. A liquid quenching apparatus comprising the injection nozzle according to claim 1. Description: