The Effects of Pressure on the Laser Initiation of TiHx/KC104 and Other Pyrotechnics

PDF Version Also Available for Download.

Description

The ignition thresholds of TiHx/KC104, Mg/Teflon, and an A1-torch mix are measured as a function of gas pressure for ignition by 514.5 nm pulses from an argon ion laser. The TiHx/KC104 system in argon gas has three distinct pressure regimes. The thresholds are very high below about 0.3 MPa, decrease rapidly between 0.3 and 1.5 MPa, and decrease gradually and become constant between 1.5 and 7 MPa. Mg/Teflon and the A1-torch mix also have decreasing thresholds with increasing gas pressures and decreasing pellet densities. Ignition pulse lengths between 0.25 and 20 milliseconds at a spot diameter of 65 microns in ... continued below

Physical Description

20

Creation Information

Holy, John A. & Girmann, Thomas C. March 1, 1987.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

The ignition thresholds of TiHx/KC104, Mg/Teflon, and an A1-torch mix are measured as a function of gas pressure for ignition by 514.5 nm pulses from an argon ion laser. The TiHx/KC104 system in argon gas has three distinct pressure regimes. The thresholds are very high below about 0.3 MPa, decrease rapidly between 0.3 and 1.5 MPa, and decrease gradually and become constant between 1.5 and 7 MPa. Mg/Teflon and the A1-torch mix also have decreasing thresholds with increasing gas pressures and decreasing pellet densities. Ignition pulse lengths between 0.25 and 20 milliseconds at a spot diameter of 65 microns in the TiHx/KC104 system indicate that the thresholds are predominantly power, not energy, thresholds for pulses longer than one millisecond. The increase in threshold power below one millisecond is consistent with a calculated time to reach thermal equilibrium of 0.96 milliseconds. The effect of beam diameters between 40 and 175 microns on the TiHx/KC104 thresholds is consistent with ignitions occurring at approximately the same temperature at the center of the beam. TiHx/KC104 and Zr/KC104/Viton/Graphite pyrotechnics are also ignitied in sealed devices through sapphire windows. Ignition thresholds are comparable to those on open surfaces in pressures of 0.1 to 0.5 MPa which suggests that samples first decompose and ignite under a pocket of pressure. Ignition failures in TiHx/KC104 and in low density Zr/KC104/Viton/Graphite samples are attributed to increased porosity and/or gaps near the windows which allow reaction products to escape from the ignition zone.

Physical Description

20

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Report No.: MLM-3533(OP)
  • Grant Number: AC04-76DP00053
  • Office of Scientific & Technical Information Report Number: 968982
  • Archival Resource Key: ark:/67531/metadc935403

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • March 1, 1987

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

Description Last Updated

  • Feb. 17, 2017, 4:01 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 1
Total Uses: 4

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Holy, John A. & Girmann, Thomas C. The Effects of Pressure on the Laser Initiation of TiHx/KC104 and Other Pyrotechnics, report, March 1, 1987; Miamisburg, Ohio. (digital.library.unt.edu/ark:/67531/metadc935403/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.