Electric detonator with milled and unmilled DBX-1

Patent metadata

Field	Value
Publication number	US-9752857-B1
Application number	US-201615015460-A
Country	US
Kind code	B1
Filing date	Feb 4, 2016
Priority date	Jul 14, 2015
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

Lead free microdet electric detonators comprising a bridgewire having milled DBX-1 as a spot charge and unmilled DBX-1 as the intermediate material. Such improved microdet electric detonator is free of lead azide and lead styphnate, but with comparable stability, power and sensitivity to current lead-based M100 electric detonators.

First claim

What is claimed is:

1. An electric detonator comprising:
a metal bridgewire having a spot charge composition disposed thereon wherein said spot charge composition comprises milled DBX-1;
an intermediate charge comprising unmilled DBX-1; and
output charge.

2. The electric detonator of claim 1 , wherein the particle size of the milled DBX-1 is about 1 μm to about 28 μm.

3. The electric detonator of claim 1 , wherein the particle size of the milled DBX-1 is about 5 μm to about 1 μm.

4. The electric detonator of claim 1 , wherein the spot charge composition further comprises nitrocellulose and lacquer.

5. The electric detonator of claim 1 , wherein said spot charge composition is a slurry.

6. The spot charge composition of claim 1 , wherein the milled DBX-1 is a single spot charge at about 0.27 mg to about 0.38 mg per header.

7. The electric detonator of claim 1 , wherein the metal bridgewire is selected from the group consisting of nickel chrome, platinum, tungsten, and platinum-iridium.

8. The electric detonator of claim 1 , wherein the bridgewire is nickel chrome.

9. The bridgewire of claim 8 wherein the diameter of said nickel chrome bridgewire is about 0.00023 inches.

10. The electric detonator of claim 1 , wherein the unmilled DBX-1 is about 12 mg.

11. The electric detonator of claim 1 , wherein the unmilled DBX-1 is loaded at a consolidation pressure of about 8 Kpsi to about 10 Kpsi and the height of the loaded unmilled DBX-1 is about 0.090 to about 0.060 inches.

12. The electric detonator of claim 1 , wherein the output charge is HMX or CL-20.

13. The electric detonator of claim 1 , wherein the output charge is HMX.

14. The electric detonator of claim 1 , wherein the HMX is about 12 mg and loaded at a consolidation pressure of about 12 to about 14 Kpsi and about 0.100 inches to about 0.130 inches in height.

15. An electric detonator comprising:
a nickel chrome bridgewire having a spot charge composition disposed thereon and wherein said spot charge composition comprises milled DBX-1, nitrocellulose and lacquer and wherein said spot charge composition is a slurry;
an intermediate charge comprising unmilled DBX-1; and
HMX.

Assignees

• Us Army

Inventors

• Mehta Neha
• Cheng Gartung
• Yee Kin
• Oyler Karl
• Shah Akash
• Marin John
• Fronabarger John W
• Williams Michael D
• Marino Steven H
• Tran Pamela

Classifications

• F42B3/124 Primary

  characterised by the configuration or material of the bridge (F42B3/13 takes precedence) · CPC title

• F42B3/128 Primary

  characterised by the composition of the pyrotechnic material · CPC title