流态化气相沉积过程中稀释气体流量对颗粒表面SiO_(2)沉积的影响  

Influence of the dilution gas flow rate on SiO deposition on the powder surface during the fluidized vapor deposition

作　　者：吴朝阳[1] 高子涵 孔辉[1] 先琛 贾吉祥 廖相巍 Zhaoyang WU;Zihan GAO;Hui KONG;Chen XIAN;Jixiang JIA;Xiangwei LIAO(International Science&Technology Cooperation Base for Intelligent Equipment Manufacturing under Special Work Environment,Anhui University of Technology,Ma'anshan,Anhui 243002,China;Ansteel Group Iron and Steel Research Institute,Anshan,Liaoning 114021,China)

机构地区：[1]安徽工业大学特殊服役环境的智能装备制造国际科技合作基地,安徽马鞍山243002 [2]鞍钢集团公司钢铁研究院,辽宁鞍山114021

出　　处：《过程工程学报》2021年第8期959-968,共10页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51904002;51674181);安徽省高校自然科学研究项目(编号:KJ2019A0077)。

摘　　要：利用Fe(Si)合金球形粉末为沉积基底,正硅酸乙酯为SiO_(2)气相介质前驱体,采用引入流化环节的化学气相沉积工艺合成了Fe(Si)/SiO_(2)复合粉末。考察了沉积过程中Ar稀释气体流量对Fe(Si)基底粉末表面SiO_(2)绝缘介质沉积过程的影响规律及形成完整核壳异质结构的稀释气体流量范围。实验结果表明,随着流态化气相沉积过程中Ar稀释气体流量的逐渐增大,SiO_(2)绝缘介质在Fe(Si)粉末基底表面的微观形貌从亚微米级团簇转变为完整薄膜再向多孔薄膜转变,沉积速率先减小后增大再降低,在250 sccm时SiO_(2)绝缘介质均匀性最好,沉积速率为0.069 nm/s。此外,形成完整Fe(Si)/SiO_(2)核壳异质结构的Ar稀释气体流量范围为200~300 sccm。Using Fe(Si)alloy particles as deposition basement materials and tetraethoxysilane as gas SiO_(2)precursor,Fe(Si)/SiO_(2)composite powders were synthesized under fluidized vapor deposition.The influence of Ar dilution gas flow rate on deposition process of SiO_(2)insulating medium,and the formation Ar dilution gas flow rate range of complete Fe(Si)/SiO_(2)core-shell heterostructure were investigated.The results showed that the microstructure of SiO_(2)insulating medium on the Fe(Si)particle base surface varied from submicron clusters to integrated films to porous films with the increasing of Ar dilution gas flow rate during a fluidized vapor deposition process,while the deposition rates SiO_(2)insulating medium first decreased,then increased and decreased again.The homogeneity of the SiO_(2)insulating medium was the best and the deposition rate was 0.069 nm/s when the Ar dilution gas was at a flow rate of 250 sccm.In addition,when reaction temperature,reaction time,gas SiO_(2)precursor content and carrier gas flow rate was 930 K,60 min,9 mL and 100 sccm respectively,the conversion from Fe(Si)alloy particles to complete Fe(Si)/SiO_(2)core-shell heterostructure particles during the fluidized vapor deposition occurred within the Ar dilution gas flow rate range from 200 sccm to 300 sccm.The results of the performance test indicated that the Fe(Si)/SiO_(2)core-shell heterostructure led to a substantial enhancement in the electrical resistivity of the particles and reduction in their saturation magnetization,but hardly affected the coercive force.Compare to Fe(Si)alloy particles,the Fe(Si)/SiO_(2)core-shell heterostructure particles exhibited much higher electrical resistivity.The varying trend of Fe(Si)/SiO_(2)core-shell heterostructure particles was consistent with the deposition rate of SiO_(2)insulating medium.The results in this study may provide a foundation for future kinetics investigations and the application of fluidized vapor deposition technology.

关 键 词：流态化气相沉积 稀释气体流量 核壳异质结构 铁硅合金 结构演化 

分 类 号：TG174.4[金属学及工艺—金属表面处理]