Preparation of Spherical Titanium Powder by RF Plasma and Its Application in Powder Injection Molding
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摘要: 采用射频等离子体球化技术对不规则形貌的氢化脱氢(HDH)钛粉进行球化处理,研究了不同载气流量、送粉速率和鞘气流量对钛粉形貌和性能的影响。此外,分别以原始HDH钛粉和球化钛粉为原料进行了粉末注射成形(MIM)试验,研究了烧结样的微观组织及理化性能。研究结果表明:采用射频等离子球化技术制备的球形钛粉的粉末特性较HDH钛粉有较大的提升,在制备过程中送粉速率、载气流量、鞘气流量等因素对粉末球化效果有较大影响,采用球化钛粉制备的MIM产品性能要优于HDH钛粉制备的MIM产品。Abstract: The hydrogenated dehydrogenation（HDH） titanium powder with irregular morphology was spheroidized by RF plasma.The effects of carrier gas flow,powder feeding rate and sheath gas flow on the morphology and properties of titanium powder were studied.In addition,powder injection molding（MIM） experiments were carried out with raw HDH titanium powder and spheroidized HDH titanium powder as raw material respectively,and the microstructure,physical and chemical properties of the sintered samples were studied.The results show that the powder characteristics of spherical titanium powder prepared by RF plasma spheroidization technology are greatly improved compared with those of the HDH titanium powder.In the preparation process,the powder feeding rate,carrier gas flow rate,sheath gas flow rate and other factors have a great influence on the spheroidization of the powder.The MIM sample prepared from the spherical titanium powder has better performance than the MIM sample prepared from the HDH titanium powder.
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