ON THE BURN RESISTANCE OF Ti-35V-15Cr-0.05C TITANIUM ALLOY

The Ti-35V-15Cr-0.05C (wt.%) is a new nonburning titanium alloy. The test for alloy combustibility was carried out by using CO sub 2 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 nonburning Ti alloy is the longest in the eight examined Ti alloys, and is 3.5 times that of TC4 alloy. The ignition temperature of the nonburning alloy is 2991 deg C, and is higher than that of TC4 alloy by 1976 deg 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. (Alloy referred to as Ti-3515C.)