摘要
铌合金因其熔点高、高温性能优良及密度小等优点,被广泛应用于航空航天和核工业等领域,而增材制造技术在这些领域复杂形状或薄壁构件的生产中具有显著优势。本文采用理论计算对增材制造用铌合金球形粉的球化过程和机理进行了分析,获得了颗粒粒径和气氛温度对球化过程的影响。结果表明,球化过程中颗粒升温熔化过程耗时远大于液滴球化过程耗时,是球化工艺的限制环节,提高气氛温度和减小颗粒粒径均有助于颗粒球化。随后,以Nb521合金粉为原料,通过高频感应等离子球化实验,进一步探究了球化功率和载气流量对粉末球化率的影响。结果表明,提高球化功率或降低载气流量有助于提升粉末球化率,当球化功率为80 kW、载气流量为5 L/min时,粉末球化率超过95%。
Niobium alloy is widely used in aerospace and nuclear industry because of its high melting point,excellent high-temperature performance and low density.For the production of complex-shaped or thinwalled components in these applications,additive manufacturing technology has obvious advantages.In this paper,the spheroidization process and mechanism of spherical niobium alloy powder for additive manufacturing were analyzed through theoretical calculations.And the influences of particle size and atmosphere temperature on the spheroidization process were obtained.The results show that the heating and melting process of the particles during spheroidization takes much longer than the droplet spheroidization process,making it the limiting step in the spheroidization process.Increasing the atmosphere temperature and reducing the particle size are both beneficial for spheroidization of particles.Subsequently,using Nb521 alloy powder as the raw material,the effects of spheroidization power and carrier gas flow rate on the powder spheroidization rate were further investigated through high-frequency induction plasma spheroidization experiments.The results indicate that both increasing the spheroidization power and decreasing the carrier gas flow rate improve the powder spheroidization rate,and the spheroidization rate exceeds 95% when the spheroidization power is 80 kW and the carrier gas flow rate is 5 L/min.
作者
任冰朗
刘奇
薄新维
王小宇
姚志远
韩校宇
何浩然
REN Bing-lang;LIU Qi;BO Xin-wei;WANG Xiao-yu;YAO Zhi-yuan;HAN Xiao-yu;HE Hao-ran(Chongqing Materials Research Institute Co.,Ltd.,Chongqing 400707,China;National Engineering Research Center for Instrument Functional Materials,Chongqing 400707,China;Chongqing Key Laboratory of Intelligent Additive Manufacturing Technology,Chongqing 400707,China)
出处
《稀有金属与硬质合金》
北大核心
2025年第6期91-100,共10页
Rare Metals and Cemented Carbides
基金
重庆市博士后科学基金项目(CSTB2023NSCQ-BHX0064)。
关键词
增材制造
Nb521
铌合金
等离子球化
球化率
理论计算
additive manufacturing
Nb521
niobium alloy
plasma spheroidization
spheroidization rate
theoretical calculation
