Powder injection molding feedstock and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10434571-B2
Application number	US-201715794338-A
Country	US
Kind code	B2
Filing date	Oct 26, 2017
Priority date	Aug 3, 2017
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A method for manufacturing a powder injection molding feedstock includes providing a plurality of powder particles and a secondary binder and applying primary kneading in an internal mixer. The primary mixture is cooled and crushed. A main binder is provided and put into the internal mixer to mix with the mixture that being crushed for secondary kneading to obtain the powder injection molding feedstock. Glass-transition temperature of the secondary binder is greater than glass-transition temperature of the main binder. The secondary binder coats the powder particles. The main binder coats the secondary binder and the powder particles.

First claim

What is claimed is:

1. A method for manufacturing a powder injection molding feedstock, comprising:
providing a plurality of powder particles and a secondary binder and putting the plurality of powder particles and the secondary binder into an internal mixer for primary kneading to obtain a mixture;
cooling the mixture to room temperature and crushing the mixture; and
providing a main binder, and putting the main binder and the mixture being crushed into the internal mixer for secondary kneading to form the powder injection molding feedstock;
wherein a glass-transition temperature of the secondary binder is greater than a glass-transition temperature of the main binder, the secondary binder coats the powder particles, and wherein the main binder coats the secondary binder and the powder particles.

2. The method of claim 1 , wherein the powder particles have a volume percentage of about 55% to about 70% of a total volume of the powder injection molding feedstock.

3. The method of claim 1 , wherein the secondary binder and the main binder have a volume percentage of about 30% to about 45% of a total volume of the powder injection molding feedstock.

4. The method of claim 3 , wherein the secondary binder has a volume percentage of about 5% to about 20% of a total volume of the secondary binder and the main binder.

5. The method of claim 1 , wherein the primary kneading is performed at a temperature greater than the glass-transition temperature of the secondary binder.

6. The method of claim 5 , wherein the primary kneading is performed at a temperature greater than 250 degrees Celsius.

7. The method of claim 1 , wherein the primary kneading is performed for a time period in a range of about 20 minutes to about 1 hour.

8. The method of claim 1 , wherein the secondary kneading is performed at a temperature which is greater than the glass-transition temperature of the main binder.

9. The method of claim 1 , further comprising:
providing an auxiliary agent and putting the auxiliary agent into the internal mixer to mix for the secondary kneading, thereby causing the auxiliary agent to be dispersed in the main binder.

Assignees

• Champ Tech Optical Foshan Corp

Inventors

• Yeh Dung-Chang
• Yan Lei
• Huang Ru-Jie

Classifications

• B22F1/10

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

• B22F1/103

  containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• C04B35/63472

  Condensation polymers of aldehydes or ketones · CPC title

• C04B35/63464

  Polycarbonates · CPC title