JPH049250A - Method and apparatus for forming amorphous material - Google Patents

Abstract

PURPOSE:To efficiently and stably enable rapid cooling of an inorganic material and to easily obtain amorphous material by drawing out molten fine flow of metallic or ceramic inorganic material with one pair of rolls, specifying air pressure to this and discharging the air from an air nozzle end. CONSTITUTION:The air introduced from a compressor is stored in a high pressure air chamber 7. This air pressure is made to >=5kg/cm<2> for developing high velocity gas flow 6 needed to effectively make the inorganic material amorphous. The air from the high pressure air chamber 7 develops the fast gas flow with opening of a valve 9 and rapidly expands from the air pipe 10 to intermediate air chamber 11 and further, in the nozzle parts 5, 5', as wave motion having sound velocity or higher than this, i.e., shocking wave 6 with the prescribed discharging pressure, the air is discharged against the inorganic material and this is rapidly cooled and made to the amorphous material.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method and apparatus for forming an amorphous material, which makes inorganic materials such as metals and ceramics amorphous and vitrified by rapid quenching. The material is expected to be used in a wide variety of fields because it can increase mechanical strength and impart and improve unique functions such as magnetic and electrical properties.

[Prior art and its problems] For example, as disclosed in Japanese Patent Application Laid-open No. 56-38252, it is known that an amorphous alloy material is obtained by rapidly cooling a molten alloy while rolling it with a pair of rolling cooling rolls. It is also known to spray a coolant such as cooling air during rolling.

Of course, cooling is achieved by heat transfer from the surface of the material, so conventional cooling methods involve forming the material into an extremely thin film to rapidly cool the material and make it amorphous. However, since there is a limit to the cooling rate, it is still difficult to obtain a stable amorphous material.

Also, JP-A-60-103043, JP-A-60-145
No. 921, etc., discloses that a glass plate is sprayed with a gas or a mixture of the gas and a spray liquid at a flow rate higher than the speed of sound to rapidly cool and strengthen the glass plate, but of course this cannot be used as is to form an amorphous material. In particular, methods using spray liquid have difficulties in uniformly spraying the spray liquid and making the droplets uniform in diameter, making it difficult to obtain a stable amorphous material.

The present invention solves the above-mentioned problems and provides a method for easily forming a metallic or ceramic amorphous material, and an apparatus therefor.

[Means for Solving the Problems] The present invention provides a method of drawing out a molten stream of a metallic or ceramic inorganic material with a pair of rolls, and rapidly cooling it by discharging air from the end of an air nozzle to form an amorphous material. , the original air pressure of the air supply chamber.
i'uy・'- or more, and through a two-stage rapid air expansion process from the chamber to the end of the air nozzle, a high-speed airflow is discharged from the end of the air nozzle, and the metal or ceramic inorganic material is melted. In an apparatus for forming an amorphous material by discharging cooling air from a pair of quenching means after flowing down from a tank and passing through a pair of drawer rolls, the quenching means includes a high-pressure air chamber;
It consists of an air pipe that guides the air from the chamber to the intermediate air chamber and has an on-off valve arranged at an appropriate position, and a nozzle section that discharges the air from the intermediate air chamber toward the inorganic material.

[Example] The present invention will be explained below based on the accompanying drawings.

FIG. 1 is a front view of a section for blowing air to an inorganic melting material in the present invention, and 1 is a melting tank for a metallic or ceramic inorganic material 2, which is heated and maintained above its melting point.

The inorganic material 2 includes Fe-Cr-P-0, Fe
Co-Si-B, Fe-Cr-P-C and other alloy materials, SiO2-Al203-Cab, 5i02
-Ti02-Na20Na20- Ta205- Nb
Glass materials such as No. 205 and ceramic materials that have been difficult to vitrify are used.

3 is an orifice, and the diameter can be set as appropriate in the range of several to several dozen diameters. The inorganic material 2 flowing down from the orifice 3 is further drawn out by a drawing roll 4.4.

The drawing speed is set to several +1/sec to several tens of m7 seconds, and the present invention does not require high-speed drawing or excessive rolling to form an extremely thin film as in conventional means.

Reference numeral 5.5a designates a pair of air nozzle parts, which discharge high-speed airflow 6.6a from their tips. Note that a plurality of air tubes are provided as shown by 5' and 5a' in the figure to ensure that high-speed airflow is sufficiently distributed over the inorganic material 2.

FIG. 2 is a front view of one of a pair of quenching means for generating and discharging high-speed airflow, and air introduced from a compressor (not shown) is stored in a high-pressure air chamber 7. The air pressure is set to 5 pupils/- or more in order to generate the high-speed airflow 6 necessary to effectively amorphize the inorganic material 2, as will be described later.

The air from the high pressure air chamber 7 is guided to the air pipe 8, which is connected to the low pressure side air pipe 10 by the on-off valve 9.
and compartmentalize it. The other end of the air pipe 10 is connected to one side of an intermediate air chamber 11 whose pressure is adjusted to near or above normal pressure, and the other side of the intermediate air chamber 11 is connected to one or more nozzle portions 5.5'. Make the connection.

The shape of the nozzle portion 5.5° does not matter; it may be cylindrical, or it is more convenient if it is a Laval tube type.

If the internal pressure of the intermediate air chamber 11 is to be set to other than normal pressure before opening the on-off valve 9, air is introduced through the conduit 12 (indicated by the broken line) by a compressor or high-pressure pump (not shown). Alternatively, the security may be maintained by, for example, an on-off valve 13 (indicated by a broken line), and the on-off valve 13 is opened and closed in conjunction with the on-off valve 9. The air from the high-pressure air chamber 7 generates a high-speed airflow by opening the on-off valve 9 and rapidly expands from the air pipe 10 to the intermediate air chamber 11, and furthermore, the discharge pressure at the nozzle portion 5.5' is 0.5 kg/ - The following is used to form waves at the speed of sound or higher speeds, that is, shock waves 6, which are discharged toward the inorganic material 2, and are rapidly cooled to become amorphous.

According to the configuration of the present invention, a shock wave can be stably generated, and thereby an inorganic material can be efficiently and quickly quenched.

1 to 5 and Examples 1 to 3 The cooling means consists of the configuration shown in FIGS. 1 and 2, namely, the high-pressure air chamber 7, the air pipe 8.10 (on/off valve 9), the intermediate air chamber 11, and the air nozzle portion 5.5'. Using a pair, a high-speed airflow was pulsed under the pressure conditions shown in Table 1, and various alloy materials, ceramics, and glass materials 2 pulled out from the melting tank 1 were subjected to amorphization (vitrification) tests.

Note that X and Y in the table correspond to the positions X and Y of the pressure meter in FIG.

The results were determined by appearance observation and X-ray diffraction, with good amorphization (vitrification) and local crystal precipitation (devitrification).
Table 1 also shows the shapes of the crystals.

As is clear from the table, the Examples show good results. On the other hand, Comparative Examples 1 and 3 have low original air pressure, and Comparative Example 2 does not have an intermediate air chamber, so a high-speed air flow necessary for amorphization is generated. No, crystal precipitation (devitrification) was observed in both cases.

(See Table 1 below.) [Effects of the Invention] According to the present invention, an effect is achieved in that an inorganic material can be rapidly and stably quenched efficiently and an amorphous material can be easily obtained.

[Brief explanation of drawings]

1 and 2 are front views according to the present invention. 5.5'', 5a, 5a' - Air nozzle section 7 - High pressure air chamber 8.10 - Air pipe 9 - Opening/closing valve 11 - Intermediate air chamber Patent applicant Central Glass Co., Ltd. Agent
Patent attorney Sakae Sakamoto

Claims (1)

[Claims] 1) A method for forming an amorphous material by drawing out a molten stream of a metallic or ceramic inorganic material with a pair of rolls and rapidly cooling it by discharging air from the end of an air nozzle to form an air supply chamber. Original air pressure of 5kg
/cm^2 or more, and a method for forming an amorphous material, which comprises passing through a two-stage rapid air expansion process from the chamber to the end of the air nozzle, and then discharging a high-speed airflow from the end of the air nozzle. 2) An apparatus for forming an amorphous material by causing a metallic or ceramic inorganic material to flow down from its melting tank, passing through a pair of pull-out rolls, and discharging cooling air from a pair of quenching means, in which the quenching means is a high-pressure air a chamber; an air pipe that guides air from the chamber to an intermediate air chamber and has an on-off valve placed at an appropriate location;
An apparatus for forming an amorphous material, comprising a nozzle portion for discharging air from the intermediate air chamber toward the inorganic material.