JP2009019261A - Coating method for amorphous alloy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that rapid cooling treatment is required for the formation of an amorphous alloy, and a method of coating the surface of an object to be worked therewith is not developed as yet. <P>SOLUTION: A thick cooling dome 1 having a high thermal conductivity and a high capacity and, e.g., made of copper is connected to a centrifugal casting machine for rapid solidification, a tubular object to be worked is beforehand inserted and fixed therein and is rotated at a high speed, an amorphous alloy molten metal melted by a high frequency coil is injected toward the inside face of the object to be worked from a nozzle, and simultaneously, the nozzle is pulled up to the axial direction at a fixed speed, and coating is performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an amorphous alloy coating (surface treatment) technique.

As for amorphous alloy coating technology that requires rapid cooling, a coating method having a lamination thickness that can withstand practical use has not been developed yet.
As a related technique, as in Patent Document 1 and Patent Document 2, there is a technique in which a molten metal is poured into a copper mold that rotates at high speed and a product is cast using centrifugal force. Therefore, it is not possible to make a coating that forms thin curtains.

  Japanese Patent Application No. 2007-114846   Japanese Patent Application No. 2007-131044

  Using the centrifugal casting machine for rapid solidification of Patent Document 1 or the centrifugal casting machine for horizontal rapid solidification of Patent Document 2, an amorphous alloy is laminated on the inner surface of a tubular workpiece that requires high wear resistance and corrosion resistance. It aims to produce durable and high quality products at low cost.

By coating the various alloys, cylinders and other parts with the amorphous alloy of the present invention to impart wear resistance and durability, the life of the parts can be extended and the construction method is also simple.
In addition, since rare metals such as zirconium (Zr) and niobium (Nb) are used as the material of this alloy, it is more cost effective to coat only the necessary parts with a small amount of material than casting products. It is effective in reducing.

  The present invention uses the rapid solidification centrifugal caster of Patent Document 1 or the horizontal rapid solidification centrifugal caster of Patent Document 2, and a cooling cylinder is attached to its flange or mold holder, and the inner surface has a rough surface such as irregularities. A tubular workpiece to be processed is inserted and fixed, and a molten amorphous alloy is dropped or injected from the nozzle onto the inner surface thereof to form an amorphous alloy on the surface, and coating is performed.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the first embodiment uses the vertical rapid solidification centrifugal casting machine of Patent Document 1 and is suitable for coating a relatively short workpiece 2.

  First, a rough surface treatment is applied to the inner surface of the workpiece in order to tightly fix the coated amorphous layer to the workpiece.

A metal cylinder having a high thermal conductivity (for example, copper) is used, and a thick cylindrical cooling cylinder 1 having a large volume is attached to the flange A in order to increase the heat capacity, and the workpiece 2 is inserted and fixed therein. It is rotated at a high speed, and a fixed amount is dropped from the nozzle B toward the center of rotation of the workpiece.
The molten metal is diffused radially by centrifugal force and is attached to the inner surface of the workpiece 2 and coated.

  In the second embodiment, the rapid solidification centrifugal casting machine and the cooling cylinder 1 described in the first embodiment are used, and first, as in the first embodiment, a rough surface processing is performed on the inner surface of the workpiece 2. The nozzle is pulled up at a constant speed while injecting the amorphous alloy melt from the nozzle B toward the inner surface of the workpiece 2 rotating at high speed with the pressure of an inert gas such as argon. In contrast, the coating is applied in a spiral manner.

  The third embodiment uses a horizontal rapid solidification centrifugal casting machine of Patent Document 2, and is suitable for coating a relatively long inner surface of a workpiece.

  As in the first and second embodiments, the inner surface of the workpiece 4 is roughened, a metal having a high thermal conductivity (for example, copper) is used, and the thick cylindrical cooling cylinder 3 is used. Is attached to the mold holder C, the workpiece is inserted and fixed in the cooling cylinder 3 and rotated at high speed, and the amorphous alloy melt flows out from the nozzle D toward the inner surface of the workpiece, or by the pressure of the inert gas. The nozzle is run in the axial direction at a constant speed while injecting, and the molten metal is injected and coated in a spiral shape for coating.

  Amorphous alloy is a new material called bulk metallic glass (BMG), and has excellent properties such as strength (Young's modulus), hardness, wear resistance, and corrosion resistance. The product can be used for home appliances and decorations.

Sectional drawing which shows the rapid cooling part of Example 1 Sectional drawing which shows the rapid cooling part of Example 2 Sectional drawing which shows the rapid cooling part of Example 3 Reference explanatory diagram showing the device configuration of Patent Document 1 Reference explanatory diagram showing the device configuration of Patent Document 2

Explanation of symbols

1, 3 Cooling cylinder 2, 4 Work piece A Flange C Mold holder B, D Nozzle

Claims (3)

  Using a centrifugal casting machine for rapid solidification described in Patent Document 1, a thick-walled cylindrical cooling cylinder made of a material with high thermal conductivity is attached to the flange, and the inner surface is subjected to rough surface processing. The object is inserted and fixed and rotated at a high speed, and the amorphous alloy melt is dropped from the nozzle onto the center of rotation, and is diffused by centrifugal force to form an amorphous alloy layer on the inner surface of the workpiece to be coated. Amorphous alloy coating method.   Using a centrifugal casting machine for rapid solidification described in Patent Document 1, a thick-walled cylindrical cooling cylinder made of a material with high thermal conductivity is attached to the flange, and the inner surface is subjected to rough surface processing. The object is inserted and fixed and rotated at a high speed. The amorphous alloy layer is formed on the inner surface of the workpiece by pulling the nozzle at a constant speed while injecting the molten amorphous alloy from the nozzle to the inner surface of the workpiece with the pressure of inert gas. A method for coating an amorphous alloy, characterized in that a layer is formed and coated.   Using a horizontal rapid solidification centrifugal caster described in Patent Document 2, a thick cylindrical cooling cylinder made of a material having high thermal conductivity was attached to the mold holder, and the inner surface was subjected to rough surface processing. The work piece is inserted and fixed and rotated at a high speed, and the nozzle is moved at a constant speed in the axial direction of the work piece while injecting the molten amorphous alloy from the nozzle onto the inner surface of the work piece. An amorphous alloy coating method, wherein an amorphous alloy layer is formed on an inner surface of a workpiece and coated.

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