Theoretical research on oxide film fracture behavior during titanium particle ignition

Based on thermal self-ignition theory, in combination with theoretical analysis of the stress between oxide film and matrix with experiment fact, the viewpoint that outermost oxide film fractured first without penetrating crack was put forward, and based on this viewpoint, the model, studying the effect of outer oxide film fracture behavior on titanium particles ignition was established. Further, the physical analogue experiments about titanium ignition were carried out. Research results showed that in lower temperature during 673-1373K, titanium particles oxidized thermostatically, and oxidation kinetics curve changed into straight line from parabola due to oxide film fracture. While in higher temperature, ignition temperature was reduced by 45K due to oxide film fracture, which had no obvious effect on ignition process of titanium particles. With increasing in size of titanium particle, there was no obvious change for ignition temperature of titanium particles, which was different from complete fracture of