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Granulated powder and method for producing granulated powder

Inactive Publication Date: 2011-09-01
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]An advantage of some aspects of the invention is to provide a granulated powder which is favorably sintered even if it is fired at a relatively low temperature and is capable of producing a sintered body having a high density, and also to provide a method for producing a granulated powder capable of easily producing such a granulated powder.

Problems solved by technology

This is because if there is a space in the molding die, this space remains in the resulting molded body as a hole, which deteriorates the denseness of the metal sintered body in the end.
Such a fine powder has low fluidity, and therefore has a poor filling property in a molding die.
However, a firing furnace which can be used at a temperature of 1200° C. or higher needs a special heat resistant structure, and therefore is expensive, and also has a high running cost.
On the other hand, if the firing temperature is decreased, the density of the resulting sintered body is decreased, and a problem arises in that the sintered body has a poor mechanical property, and so on.

Method used

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  • Granulated powder and method for producing granulated powder
  • Granulated powder and method for producing granulated powder
  • Granulated powder and method for producing granulated powder

Examples

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example 1

[0133]1) First, as a starting material powder, a 2% Ni—Fe alloy powder (true density: 7.827 g / cm3, manufactured by Epson Atmix Corporation) having an average particle diameter of 6 μm produced by a water atomization method was prepared. Incidentally, the composition of the 2% Ni—Fe is as follows: C: 0.4 to 0.6% by mass, Si: 0.35% by mass or less, Mn: 0.8% by mass or less, P: 0.03% by mass or less, S: 0.045% by mass or less, Ni: 1.5 to 2.5% by mass, Cr: 0.2% by mass or less, and Fe: remainder.

[0134]2) On the other hand, as an organic binder, polyvinyl alcohol (RS-1717, manufactured by Kuraray Co., Ltd.), glycerin (manufactured by Wako Pure Chemical Industries), and an alkylamine derivative (acetate) were prepared. Further, as a solvent, ion exchanged water was prepared. Incidentally, the addition amount of the solvent was set to 50 g per gram of the organic binder. Further, the saponification degree of the polyvinyl alcohol was 93 and the polymerization degree thereof was 1700.

[0135]...

examples 2 to 9

[0142]Granulated powders were obtained in the same manner as in Example 1 except that the addition amount of glycerin was changed as shown in Table 1, respectively.

examples 10 to 15

[0143]Granulated powders were obtained in the same manner as in Example 3 except that the addition amount of the organic amine was changed as shown in Table 1, respectively.

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Abstract

A granulated powder includes a metal powder and an organic binder and is obtained by binding a plurality of metal particles in the metal powder to one another by the organic binder. The organic binder contains polyvinyl alcohol or a derivative thereof and a polyol. Further, the ratio of the apparent density of the granulated powder to the true density of the metal powder (a metal material constituting the metal powder) is from 20% to 50%. Further, as the polyol, glycerin is preferred, and the amount thereof is preferably from 0.01 to 0.2 parts by weight based on 100 parts by weight of the metal powder.

Description

[0001]This application claims priority to Japanese Patent Application No. 2010-043027 filed Feb. 26, 2010 which is hereby expressly incorporated by reference herein in its entirety.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to a granulated powder and a method for producing a granulated powder.[0004]2. Related Art[0005]One known method for molding a metal powder is a compression molding method in which a mixture of a metal powder and an organic binder is filled in a given molding die and then compressed to yield a molded body in a given shape. The obtained molded body is subjected to a degreasing treatment of removing the organic binder and a firing treatment of sintering the metal powder, thereby forming a metal sintered body. Such a technique is an exemplary powder metallurgy technique, and a large amount of a metal sintered body in a complicated shape can be produced according to the shape of the molding die. Therefore, such a technique has become widely...

Claims

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Application Information

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IPC IPC(8): B22F1/00C22C1/05B22F1/148
CPCB22F1/0096B22F1/148
Inventor KADOMURA, TAKESHI
Owner SEIKO EPSON CORP
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