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

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Benefits of technology

[0029]According to this configuration, since the right amount of the binder solution is supplied uniformly to the granulated powder, the shape an

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 tempe

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

Experimental program
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Example

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 17...

Example

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.

Example

[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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