On the burn resistance of Ti-35V-15Cr-0.05C titanium alloy

The test for alloy combustibility was carried out by using CO2 laser. A 430 watt and 6 mm diameter laser spot impinges directly on the sample within normal atmospheric pressure and temperature. The results show that the ignition time of the non-burning titanium alloy is the longest in the eight examined titanium alloys, and is 3.5 times the length of TC4 alloy. The ignition temperature of the non-burning alloy is 2991 °C, and is higher than that of TC4 alloy by 1976 °C. On the condition of high temperature and rich oxygen, the surface of alloy forms a melting layer which plays roles of oxygen insulation, heat insulation and burning products insulation. This is the mechanism of combustion resistance.