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Abstract
Abstract-Measurements has been made of the ignition temperature of three structural metals in bulk form in a pure oxygen environment. Cylindrical specimens 5 mm in diameter and 5 mm high were ignited by a focused cwCOz laser beam in a static
oxygen environment at pressures from 0.084 to 6.895 MPa. A two-color pyrometer was designed and used to measure the ignition temperature of the specimens. The temperature of a spot approximately 0.5 mm in diameter located at the center of the specimen top surface was recorded with a maximum time resolution of 25 μs and with an accuracy of a few percent. The results showed that 6061 aluminum alloy ignited at temperatures well above the melting temperature of pure aluminum but below the melting temperature of Al2o3 The ignition temperature of 302 stainless steel was approximately at the melting temperature of the alloy and the ignition temperature of 1018 carb on steel was slightly below the melting temperature of the alloy. In all three cases there was a mild dependance of ignition temperature on oxygen pressure.
