Abstract
Spontaneous ignition of massive shapes of titanium can occur at room temperature when a fresh, oxide-free metal surface is exposed to oxygen under pressure. Such a surface can be produced by the rupture of a titanium specimen under tension. If these surfaces are exposed to oxygen pressure in excess of 350 p.s.i.g. spontaneous ignition of the sample occurs. With dilute oxygen, using helium or steam as a diluent, higher pressures are required for ignition. Spontaneous ignition at various concentrations of oxygen was investigated and the effect of temperature on ignition limits was also determined. The hypothesis is suggested that only those metals whose oxides are soluble in the metal will ignite spontaneously and ignition will occur only if the initial reaction is vigorous enough to raise the surface temperature to the melting point of the metal or an eutectic.
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