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Granulated powder and method for producing granulated powder

A manufacturing method and powder technology, which can be used in the granulation of special binders, metal processing equipment, thin material processing, etc., and can solve the problems of granulation powder filling and inability to obtain products, etc.

Active Publication Date: 2011-09-21
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, although the fluidity can be improved by spheroidizing the granulated powder, if there is a narrow part in the molding die or a part of the molding die is deep, there will be a problem with the fillability of the granulated powder, and it may not be possible to obtain the desired shape. product

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1A

[0166] First, as a raw material powder, stainless steel powder with an average particle diameter of 6 μm (manufactured by EPSON ATMIX Co., Ltd., SUS-316L, true density 7.98 g / cm 3 ) produced by a water atomization method was prepared.

[0167] On the other hand, polyvinyl alcohol (manufactured by Kuraray Co., Ltd., RS-1717) was prepared as an organic binder. And, ion-exchanged water was prepared as a solvent. In addition, the added amount of the solvent was 50 g per 1 g of the organic binder.

[0168] Next, polyvinyl alcohol was mixed into ion-exchanged water and cooled to room temperature to prepare an organic binder solution. Moreover, the addition amount of polyvinyl alcohol was the quantity of 0.8 weight part with respect to 100 weight part of metal powders. In addition, the degree of saponification of polyvinyl alcohol was 93, and the degree of polymerization was 1700.

[0169] Next, the raw material powder was charged into the processing vessel of a tumbling granul...

Embodiment 2A～8A

[0178] A granulated powder was obtained in the same manner as in Example 1A, except that the addition amount of the organic binder or the low water-soluble material and its addition amount were changed to those in Table 1.

Embodiment 9A

[0180] Before making secondary particles, the raw material powder is sprayed with a solution of low water-soluble material and allowed to dry. In this way, the inner coating layer covering the surface of the raw material powder was formed. Thereafter, using the raw material powder on which the inner coating layer was formed, a granulated powder was obtained in the same manner as in Example 1A.

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Abstract

The invention provides a granulated powder and a method for producing granulated powder. The granulated powder includes secondary particles obtained by granulation such that a plurality of metal particles in a metal powder are bound to one another by an organic binder and an outer coating layer provided so as to cover the surfaces of the secondary particles. The outer coating layer is formed of a low water-soluble material having a lower water solubility than the organic binder. The material having a lower water solubility than the organic binder is preferably any of an organic amine or a derivative thereof, and an acrylic resin. Further, the outer coating layer is preferably at least partly in contact with the surfaces of the metal particles at an interface with the secondary particle.

Description

technical field [0001] The present invention relates to a granulated powder and a method for producing the granulated powder. Background technique [0002] As a method of molding metal powder, there is known a compression molding method in which a mixture of metal powder and an organic binder is filled into a predetermined molding die and compressed to obtain a molded body of a predetermined shape. The obtained molded body becomes a metal sintered body through degreasing treatment to remove the organic binder and firing treatment to sinter the metal powder. Such technology is an example of powder metallurgy technology, and since it can manufacture a large number of metal sintered bodies with complex shapes according to the shape of the forming die, it has spread in many industrial fields in recent years. [0003] In the compression molding method, first, it is necessary to fill the molding die with metal powder as much as possible without gaps. This is because if there are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/28B22F1/102B22F1/148
CPCB22F1/0062B22F1/0096Y10T428/2991Y10T428/2998B22F1/102B22F1/148
Inventor 门村刚志
Owner SEIKO EPSON CORP
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