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Influence of boron nitride (BN) addition in commercially pure titanium (Cp-Ti) was characterized for their microstructural variation, hardness and oxidation kinetics. Feedstock powders Cp-Ti with 3 wt.% BN (3BN) and 6 wt.% BN (6BN) were prepared by roller mill followed by additive manufacturing using laser engineered net shaping (LENS™). Rate of oxidation was measured from thermogravimetric analysis (TGA) at 1000°C for 50 h. Average instantaneous parabolic constants ( k   p  ) for Cp-Ti, 3BN and 6BN were 41.2±12.0, 28.6±2.8 and 18.2±9.2 mg 2 ·cm -4 ·h -1 , respectively. Cp-Ti displayed acicular α-Ti microstructure. After TGA, large equiaxed grains along with TiO 2 formation at the grain boundaries was observed, which increased the hardness. With BN addition, plate-like TiN and needle-like TiB secondary phases were also observed. Hardness for Cp-Ti, 3BN and 6BN were 256.9, 424.0 and 548.3 HV 0.2 , respectively. Overall, a small addition of BN was effective in improving the oxidation resistance of Cp-Ti.

Influence of boron nitride on reinforcement to improve high temperature oxidation resistance of titanium