Powder for additive manufacturing, additively manufactured body, method for producing additively manufactured body, and method for producing metal sintered body

Patent metadata

Field	Value
Publication number	US-2021069785-A1
Application number	US-202017016493-A
Country	US
Kind code	A1
Filing date	Sep 10, 2020
Priority date	Sep 10, 2019
Publication date	Mar 11, 2021
Grant date	—

Abstract

A powder for additive manufacturing, which is a powder to be used in a three-dimensional additive manufacturing method, including a plurality of coated particles containing metal particles, and resin coating films that cover the metal particles and contain a caking additive, wherein 0.0001≤t/D50≤0.0010 in which t is an average thickness of the resin coating films and D50 is an average particle diameter of the metal particles.

First claim

What is claimed is:

1 . A powder for additive manufacturing, which is a powder to be used in a three-dimensional additive manufacturing method, comprising a plurality of coated particles containing
metal particles, and resin coating films that cover the metal particles and contain a caking additive, wherein 0.0001≤t/D50≤0.0010 in which t is an average thickness of the resin coating films and D50 is an average particle diameter of the metal particles.

2 . The powder for additive manufacturing according to claim 1 , wherein the average particle diameter D50 of the metal particles is 0.1 μm or more and 5.0 μm or less.

3 . The powder for additive manufacturing according to claim 1 , wherein the resin coating films have hydrophobicity.

4 . The powder for additive manufacturing according to claim 1 , wherein the resin coating films contain a surfactant.

5 . The powder for additive manufacturing according to claim 1 , wherein the caking additive has a glass transition temperature of room temperature or lower.

6 . An additively manufactured body, comprising the powder for additive manufacturing according to claim 1 .

7 . A method for producing an additively manufactured body, which is a method for producing an additively manufactured body by a three-dimensional additive manufacturing method, comprising:
a powder layer formation step of forming a powder layer using a powder for additive manufacturing including a plurality of coated particles containing metal particles and resin coating films that cover the metal particles and contain a caking additive; and a caking additive dissolution step of dissolving the caking additive in the powder layer by supplying a solvent to a supply area of the powder layer so as to join the metal particles to one another in the supply area, thereby obtaining a binded body, wherein 0.0001≤t/D50≤0.0010 in which t is an average thickness of the resin coating films and D50 is an average particle diameter of the metal particles.

8 . A method for producing a metal sintered body, comprising:
a degreasing step of subjecting an additively manufactured body produced by the method for producing an additively manufactured body according to claim 7 to a degreasing treatment, thereby obtaining a degreased body; and a firing step of firing the degreased body, thereby obtaining a metal sintered body.

Assignees

• Seiko Epson Corp

Inventors

• Nakamura Hidefumi
• Nakamura Atsushi
• Sano Toshiki
• Shima Naoko

Classifications

• B22F1/052 Primary

  characterised by a mixture of particles of different sizes or by the particle size distribution · CPC title

• B22F1/10

  Metallic powder containing lubricating or binding agents; Metallic powder containing organic material · CPC title

• B22F1/05

  Metallic powder characterised by the size or surface area of the particles · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title