TiAl合金粉末射頻等離子體球化過(guò)程數(shù)值模擬

TiAl合金粉末射頻等離子體球化過(guò)程數(shù)值模擬Numerical Simulation of Spheroidization Process of TiAl Alloy Powders in Radio Frequency Plasma

采用數(shù)值模擬的方法對(duì)TiAl合金粉末的射頻（radio frequency）等離子體球化過(guò)程進(jìn)行研究，分析速度場(chǎng)和溫度場(chǎng)對(duì)不同粒徑TiAl合金粉末的運(yùn)動(dòng)軌跡及質(zhì)量變化的影響。結(jié)果表明：粉體顆粒在等離子體的高溫作用下溫度急劇升高，表面蒸發(fā)導(dǎo)致粒徑降低，太小的顆粒很快蒸發(fā)消失掉；在冷卻塔下端，不同粒徑顆粒的運(yùn)動(dòng)軌跡存在較大差異，小顆粒傾向于隨氣流進(jìn)入氣流出口，大顆粒落到冷卻塔底部被收集；增大氣流量會(huì)提高球化系統(tǒng)中的氣流速度，導(dǎo)致在氣流出口能被氣流帶走的顆粒粒徑變大，收粉率降低；模擬得到TiAl合金粉末球化后的粉末粒徑分布、平均粒徑及收粉率等參數(shù)與實(shí)驗(yàn)結(jié)果比較接近，模型能夠較好地符合實(shí)際球化過(guò)程。

A numerical simulation method was used to study the radio frequency plasma spheroidization process of TiAl alloy powder. The effects of velocity field and temperature field on the motion trajectory and mass change of TiAl alloy powder with different particle size were analyzed.The results show that the temperature of powder particles increases rapidly under high temperature plasma, surface evaporation cause the reduction of particle size, and particles with small size tend to evaporate quickly. The motion trajectory of particles with different sizes in the lower end of the cooling tube is different obviously, small particles tend to enter the air outlet,while the larger particles are easy to fall down to the bottom of the cooling tube to be collected. Increasing air flow rate can improve the velocity of air flow in the spheroidizing system, causing larger particles to be taken away by the air, resulting in yield reduction. The simulation results of TiAl alloy powder spheroidization are close to the experimental results refer to parameters such as powder size distribution, average particle size and powder yield, and the model is in good accordance with the actual process of the spheroidization.

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