Powder feed for injection molding process and method for manufacturing porous metal

Patent metadata

Field	Value
Publication number	US-2020164434-A1
Application number	US-201916286983-A
Country	US
Kind code	A1
Filing date	Feb 27, 2019
Priority date	Nov 27, 2018
Publication date	May 28, 2020
Grant date	—

Abstract

A method for manufacturing a porous metal with enhanced ability to bond to a plastic subsequently powder feed for injection molding process provides a powder feed to an injection molding process, to form a green embryo. The green embryo is sent into a sintering furnace for high-temperature sintering to obtain a blank sintered product. A chemical reagent is applied to form pores on the sintered product. The powder feed includes first and second metal powders evenly mixed. The second metal powder has a mass percentage of about less than 10% of a total mass of the powder feed for injection molding process. The first metal powder is corrosion-resistant. The second metal powder is readily corrodible.

First claim

1 . A powder feed for injection molding process, comprising:
a first metal powder, and a second metal powder, wherein the first metal powder and the second metal powder are mixed together evenly; the second metal powder has a mass percentage of about less than 10% of a total mass of the powder feed for injection molding process; the first metal powder is corrosion-resistant; the second metal powder is readily corrodible.

2 . The powder feed for injection molding process of claim 1 , wherein the first metal powder is stainless steel metal powder.

3 . The powder feed for injection molding process of claim 2 , wherein the stainless steel metal powder is at least one of 17-4PH, 316L, and SKD61.

4 . The powder feed for injection molding process of claim 1 , wherein particles of the first metal powder are micron-sized.

5 . The powder feed for injection molding process of claim 1 , wherein the second metal powder is at least one of a carbon-based iron powder and a low carbon steel-based alloy powder.

6 . The powder feed for injection molding process of claim 5 , wherein the second metal powder is G1010, a carbon-based iron powder.

7 . The powder feed for injection molding process of claim 1 , wherein particles of the second metal powder are micron-sized.

8 . The powder feed for injection molding process of claim 1 , wherein the injection molding feed further comprises a binder, the first metal powder, the second metal powder, and the binder are mixed together evenly

9 . The powder feed for injection molding process of claim 8 , wherein the binder has a mass percentage of about less than 10% of the total mass of the powder feed for injection molding process.

10 . A method for manufacturing a porous metal, comprising:
proving a powder feed for injection molding process and adding the powder feed for injection molding process into an injection molding machine to form a green embryo; wherein the injection molding feed comprises first metal powder and second metal powder, wherein the first metal powder and the second metal powder are mixed together evenly; the second metal powder has a mass percentage of about less than 10% of a total mass of the powder feed for injection molding process; the first metal powder is corrosion-resistant; the second metal powder is readily corrodible; sending the green embryo into a sintering furnace for high-temperature sintering to obtain a sintered product; and providing a chemical reagent and applying the chemical reagent to the sintered product to form uniformly distributed pores on surface of the sintered product to obtain a porous metal.

11 . The method of claim 10 , wherein temperature of the high-temperature sintering is 1300±5 degrees Celsius.

12 . The method of claim 10 , wherein the chemical reagent is aqua regia weak solution with 75% HCL+25% HNO 3 or aqua regia weak solution with solute containing Cl − .

13 . The method of claim 10 , wherein the first metal powder is a stainless steel metal powder.

14 . The method of claim 13 , wherein the stainless steel metal powder is at least one of 17-4PH, 316L, and SKD61.

15 . The method of claim 10 , wherein the second metal powder is at least one of a carbon-based iron powder and a low carbon steel-based alloy powder.

16 . The method of claim 10 , wherein the injection molding feed further comprises a binder; the first metal powder, the second metal powder, and the binder are mixed together evenly.

17 . The method of claim 16 , wherein the binder has a mass percentage of about less than 10% of the total mass of the powder feed for injection molding process.

Assignees

• Champ Tech Optical Foshan Corp

Inventors

• Zhu jin-hong
• Yeh Dung-Chang

Classifications

• B22F3/225 Primary

  by injection molding · CPC title

• B22F3/1143

  involving an oxidation, reduction or reaction step · CPC title

• B22F3/10

  Sintering only · CPC title

• B22F3/227

  by organic binder assisted extrusion · CPC title

• B22F3/1103

  with particular physical characteristics · CPC title