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

机译：氮化硼对增强钛的高温抗氧化性能的影响

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摘要

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 T). Rate of oxidation was measured from thermogravimetric analysis (TGA) at 1000 degrees C for 50 h. Average instantaneous parabolic constants (kp) 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), respectively. Cp-Ti displayed acicular alpha-Ti microstructure. After TGA, large equiaxed grains along with TiO2 formation at the grain boundaries were 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 +/- 7.7, 424.0 +/- 33.6, and 548.3 +/- 49.7 HV0.2, respectively. Overall, a small addition of BN was effective in improving the oxidation resistance of Cp-Ti.
机译：表征了在商业纯钛（Cp-Ti）中添加氮化硼（BN）的微观结构变化，硬度和氧化动力学。原料粉末，具有3 wt％BN（3BN）和6 wt％BN（6BN）的Cp-Ti，是通过辊磨机制备的，然后使用激光工程网成形（LENS T）进行增材制造。氧化速率是由热重分析（TGA）在1000摄氏度，50小时的条件下测量的。 Cp-Ti，3BN和6BN的平均瞬时抛物线常数（kp）分别为41.2 +/- 12.0、28.6 +/- 2.8和18.2 +/- 9.2 mg（2）/（cm（4）h）。 Cp-Ti显示出针状的α-Ti微观结构。 TGA后，观察到较大的等轴晶粒以及在晶界处形成TiO2，从而增加了硬度。加入BN后，还观察到了板状TiN和针状TiB第二相。 Cp-Ti，3BN和6BN的硬度分别为256.9 +/- 7.7、424.0 +/- 33.6和548.3 +/- 49.7 HV0.2。总体而言，少量添加BN可以有效改善Cp-Ti的抗氧化性。

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