Scintered powder metal shaped charges

Patent metadata

Field	Value
Publication number	US-10041769-B2
Application number	US-201615059273-A
Country	US
Kind code	B2
Filing date	Mar 2, 2016
Priority date	Sep 10, 2009
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A shaped charge includes a casing defining an interior volume, wherein the casing is prepared by sintering a metal powder or a mixture of metal powders; a liner located in the interior volume; and an explosive between the liner and the casing. A method for manufacturing a shaped charge casing includes the steps of mixing a metal powder or a metal powder mixture with a binder to form a pre-mix; pressing the pre-mix in a mold to form a casing green body; heating the casing green body to a first temperature to vaporize the binder; raising the temperature to a second temperature in an inert or reducing atmosphere to sinter the metal powder or the metal powder mixture to produce the shaped charge casing.

First claim

The invention claimed is:

1. A method for manufacturing a shaped charge casing, comprising:
mixing a metal powder or a metal powder mixture with a binder to form a pre-mix;
pressing the pre-mix in a mold to form a casing green body;
heating the casing green body to a first temperature to vaporize the binder, wherein the first temperature is about 300-500° C.;
raising the temperature to a second temperature in an inert or reducing atmosphere to sinter the metal powder or the metal powder mixture to produce the shaped charge casing.

2. The method of claim 1 , wherein the metal powder comprises steel powder.

3. The method of claim 1 , the metal powder mixture comprises steel powder and an additive.

4. The method of claim 3 , wherein the additive is carbon or graphite.

5. The method of claim 3 , wherein the additive is at least one selected from the group consisting of tin powder, zinc powder, brass powder, and bronze powder.

6. The method of claim 3 , wherein the steel powder comprise 80-90% by weight and the comprises 10-20% by weight.

7. The method of claim 3 , the additive comprises a mixture of tungsten and nickel or a mixture of tungsten and cobalt.

8. The method of claim 1 , further comprising steam treating the shaped charge casing with a coating of iron oxide.

9. The method of claim 1 , wherein the second temperature is about 1150° C.

Assignees

• Schlumberger Technology Corp

Inventors

• King Allan W
• Caminari Richard T

Classifications

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• E21B43/118

  characterised by lowering in vertical position and subsequent tilting to operating position · CPC title

• E21B43/117

  Shaped-charge perforators (E21B43/118 takes precedence) · CPC title

• B22F3/1258

  Container manufacturing · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title