JPH06212205A - Production of amorphous metallic product and molded material for production of amorphous metallic product - Google Patents

Abstract

PURPOSE:To produce the product which internally maintains an amorphous state and has a large thickness by kneading amorphous metallic particulates and a resin binder, injection molding the mixture, removing the resin binder by heating and sintering the particulates to each other at the glass transition point of the metallic particles or above. CONSTITUTION:A proper amt. of the resin binder 2 is added to the amorphous metallic particulates 1 (about 50 to 100mum grain sizes) at the temp. lower than the glass transition point of the metallic particulates 1 and the mixture is kneaded. The kneaded mixture is injection molded to form the molded material 3. This molded material is heated at a temp. below the glass transition point of the metallic particulates 1 to remove the resin binder; thereafter, the molded material is sintered in an atmosphere of a temp. above the glass transition point or above this point, by which the metallic particulates are held in the amorphous state and are sintered. As a result, the sintered body 4 of the amorphous metal having the large thickness and the large size is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an amorphous metal product using an injection molding technique and a molded product for producing the amorphous metal product.

[0002]

2. Description of the Related Art A liquid quenching method is used for manufacturing an amorphous alloy, but it usually requires a cooling rate of 10 ⁴ to 10 ⁶ K / sec. For this reason, the alloy shape must be such that a large cooling rate can be obtained, and it is small and has a small wall thickness such as ribbon, fine wire, spherical powder, etc., and has been limited to a simpler shape. On the other hand, when the wall thickness becomes thicker, the quenching effect spreads only to the surface layer, the heat does not escape inside, and it escapes from the amorphous state and shifts to the crystalline state. It was not possible to obtain an amorphous alloy.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a method for producing an amorphous metal product having a large thickness and a large inside thickness, and a molded product for producing the same, by utilizing the technique of injection molding. .

[0004]

Thus, according to the invention of "Claim 1" of the present application, "amorphous metal fine particles"
(1) and a resin binder (2) that can be removed at a temperature lower than the glass transition point of the metal fine particles are kneaded, and this kneaded product is injection molded, and the obtained injection molded product (3) is formed into the above glass transition point. The resin binder (2) is removed at a lower temperature than that, and then the metal fine particles (1) are sintered in an atmosphere at a temperature of the glass transition temperature or higher or in the vicinity thereof to obtain an amorphous metal sintered body (4). And a method for producing an amorphous metal product ”.

In the production method of the present invention, the amorphous metal fine particles (1) may be any as long as they smoothly flow through the sprue or runner of the injection molding machine and do not hinder the injection. For example, those having a particle size of about 50 to 100 μm are preferable. The amorphous metal fine particles (1) can be produced by, for example, rapidly cooling a raw material metal in the form of powder, but not limited to this. Further, as the amorphous metal fine particles (1), amorphous alloy powder is preferable from the viewpoint of availability, and as the amorphous alloy, for example, Mg ₆₅ Cu ₂₅ Y ₁₀ can be mentioned.

Resin binder used in the manufacturing method of the present invention
(2) is selected that can be removed at a temperature lower than the glass transition point of the amorphous metal fine particles (1), solvent degreasing method,
It may be removed by any degreasing method such as a thermal degreasing method, a gas degreasing method, a chemical reaction degreasing method, etc., but a point by a chemical reaction degreasing method that can be gasified and removed by chemical decomposition can be degreased at a low temperature. However, the modified acetal resin is exemplified, but the present invention is not limited thereto.

In the production method of the present invention, the above-mentioned amorphous metal fine particles (1) and the resin binder (2) are kneaded and subjected to injection molding. However, even if the kneading is performed in the process of injection molding, Alternatively, the kneaded material may be manufactured into pellets prior to injection molding.

The above kneaded product is capable of uniformly dispersing the amorphous metal fine particles (1) in an amount sufficient to secure the intended shape of the molded product and the amorphous metal fine particles in this amount, and does not impair the function of the injection molding machine. It is prepared from a resin binder (2) in an amount sufficient to impart a degree of fluidity.

The injection-molded product (3) of the kneaded product is a molded product for producing an amorphous metal product of the invention according to "claim 2" of the present application. The injection-molded product (3) is subjected to a resin binder removal treatment (hereinafter referred to as degreasing) at a temperature lower than the glass transition point of the amorphous metal fine particles. When a modified acetal resin is used as the resin binder (2), it can be easily decomposed into formaldehyde gas in the presence of an acid catalyst such as nitric acid to be removed. For the degreasing treatment at this time, for example, BA
A SF method degreasing furnace is preferably used.

The molded product after the removal of the resin binder is heat-treated in an atmosphere of a temperature not lower than the glass transition point or in the vicinity thereof, and the amorphous metal fine particles are sintered while maintaining the amorphous state, and the amorphous metal sintered body (4 ) Will be obtained.

[0011]

According to the present invention, amorphous metal fine particles (1)
And a resin binder (2) that can be removed at a temperature lower than the glass transition point of the metal fine particles are kneaded and injection-molded, and the obtained injection-molded article (3) has a temperature lower than the glass transition point. Then, the resin binder (2) is removed, and then the amorphous metal fine particles (1) are brought into a molten state in an amorphous state by being subjected to a heat treatment in an atmosphere at a temperature equal to or higher than the glass transition point, and the particles are burned to each other. As a result, the amorphous metal sintered body (4) is formed.

[0012]

The present invention will be described in detail below with reference to the illustrated embodiments, but the present invention is not limited thereto. Example 1 FIG. 1 is a schematic process explanatory view illustrating a manufacturing method of the invention according to the "claim 1" of the present application. As the raw material amorphous metal fine particles (1), an amorphous alloy having a temperature-viscosity curve as shown in FIG. 2 [Mg ₆₅ Cu ₂₅ Y ₁₀ : glass transition point
(Tg: around 270 ° C.) fine particles (particle diameter of about 10 μm, approximately spherical particles), and modified acetal resin was used as the resin binder (2).

These were kneaded as shown in FIG. 1A to prepare pellets. The state of existence of the spherical amorphous metal fine particles (1) and the modified acetal resin (2) in this pellet is as shown in the schematic enlarged view of FIG. Then
The above pellets were injected into a complicated shape by an ordinary injection molding machine (FIG. 1B) to obtain an injection molded product (3).

When this injection-molded article (3) is heat-treated at a low temperature (for example, about 160 ° C.) below the glass transition point (Tg) in the presence of an acid catalyst such as nitric acid (HNO ₃ ), an enlarged schematic view of FIG. 4 is obtained. As shown, the acetal resin in the molded product is chemically decomposed into formaldehyde (CH ₂ O) and degreased (FIG. 1C).

The molded product after degreasing has a glass transition point (Tg:
When heat-treated in an atmosphere at a temperature of about 270 ° C), as shown in the enlarged schematic view of FIG.
In (1), the amorphous state was maintained, but the molten state was maintained, and the metal particles were bonded to each other and contracted to obtain an amorphous metal product comprising the amorphous metal sintered body (4) (FIG. 1D). As described above, a complex and thick product made of an amorphous alloy can be obtained.

[0016]

According to the present invention, it is possible to very simply manufacture a thick amorphous metal product having a complicated shape and maintaining an amorphous state inside.

[Brief description of drawings]

FIG. 1 is a schematic process explanatory view illustrating a method of the invention according to claim 1 of the present application.

FIG. 2 Temperature-viscosity curve of an example of amorphous metal fine particles

FIG. 3 is an enlarged schematic view of a pellet made of a kneaded product of amorphous metal particles and a modified acetal resin.

FIG. 4 is an enlarged schematic diagram illustrating a degreased state of an injection molded product due to chemical decomposition.

FIG. 5 is an enlarged schematic diagram illustrating a sintering state by heat treatment at a glass transition point.

[Explanation of symbols]

(1)… Amorphous metal fine particles (2)… Resin binder (3)… Injection molded product (4)… Amorphous metal sintered body

Claims (2)

[Claims] 1. Amorphous metal fine particles and a resin binder that can be removed at a temperature lower than the glass transition point of the metal fine particles are kneaded, and this kneaded product is injection molded. The production of an amorphous metal product, characterized in that the resin binder is removed at a low temperature, and then the fine metal particles are sintered in an atmosphere at a temperature above or near the glass transition point to obtain an amorphous metal sintered body. Law. 2. A molded product for producing an amorphous metal product, which comprises a kneaded product of amorphous metal fine particles and a resin binder that can be removed at a temperature lower than the glass transition point of the metal fine particles, and is injection-molded into a predetermined shape. .