STP1040

    Promoted Ignition - Combustion Behavior of Selected Engineering Alloys In Oxygen Gas Mixtures

    Published: Jan 1989


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    Abstract

    Promoted ignition and more recently promoted combustion are terms which have been used to describe a situation where a substance with low oxygen compatibility ignites and supports the combustion of a more ignition resistant material. A companion paper described the investigation of this phenomenon as it related to carbon steel and 316L stainless steel. In this paper, additional data will be presented on the promoted ignition-combustion behavior of other engineering alloys which may be encountered in or considered for gaseous oxygen applications.

    Although a number of papers in recent years have dealt with metal ignition-combustion studies in gaseous oxygen, a standard ASTM test to cover this phenomenon does not currently exist. Due to the range in pressure and purity requirements in oxygen applications, answers to the following issues are needed: (1) applicability of flowing vs. static (fixed) volume approaches, (2) significance of the test volume in static tests, (3) promoter selection, (4) oxygen purity, and (5) test methods for reduced pressures.

    In this investigation, alloys have been evaluated via both flowing and static (fixed Volume) approaches using the rod configuration used in the joint ASTM-CGA-NASA program. Static tests have been conducted in a vessel of the same volume as the apparatus used by NASA in the joint ASTM-CGA-NASA test program conducted at WSTF and also in a larger 6.0 liter vessel. Oxygen-nitrogen gas mixtures with purities ranging from approximately 40% to 99.7% at pressures of 0.79 MPa to 34.6 MPa were used in the comparative studies of five alloys from the austenitic stainless steel, aluminum-bronze, cobalt and nickel families.

    Keywords:

    oxygen, metals ignition, promoted ignition-combustion, austenitic stainless steel, aluminum-bronze, cobalt and nickel alloys


    Author Information:

    Zawierucha, R
    Manager and engineering associate, materials engineering laboratory, Union Carbide Industrial Gases Inc., Tonawanda, NY

    Mc Ilroy, K
    Manager and engineering associate, materials engineering laboratory, Union Carbide Industrial Gases Inc., Tonawanda, NY


    Paper ID: STP24925S

    Committee/Subcommittee: G04.01

    DOI: 10.1520/STP24925S


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