以NH4VO3和Mn CO3为原料,采用水热法制备了Mn2V2O7纳米棒,采用X射线衍射(XRD)及场发射扫描电子显微镜(FE-SEM)对样品的结构和形貌进行了表征,并对其反应机理进行了探讨。以Mn2V2O7纳米棒作为锂离子电池的负极材料,对其电化学储锂性能进...以NH4VO3和Mn CO3为原料,采用水热法制备了Mn2V2O7纳米棒,采用X射线衍射(XRD)及场发射扫描电子显微镜(FE-SEM)对样品的结构和形貌进行了表征,并对其反应机理进行了探讨。以Mn2V2O7纳米棒作为锂离子电池的负极材料,对其电化学储锂性能进行了初步研究。结果表明:Mn2V2O7纳米棒在50 m A/g条件下的首次放电比容量为962.4 m Ah/g,循环50周后其放电比容量可稳定在389.4 m Ah/g,显示出较好的循环性能。展开更多
Dual-layer thermal barrier coatings(TBCs)with ultrahigh temperature resistance were prepared on the surface of molybdenum-rhenium alloy hot-end components.The preparation of the MoSi_(2)-Gd_(2)Zr_(2)O_(7)dual-layer TB...Dual-layer thermal barrier coatings(TBCs)with ultrahigh temperature resistance were prepared on the surface of molybdenum-rhenium alloy hot-end components.The preparation of the MoSi_(2)-Gd_(2)Zr_(2)O_(7)dual-layer TBCs was designed based on the coefficient of thermal expansion and the coating functionality,and it was completed using atmospheric plasma spraying technique.The microstructure,mechanical properties,and thermal properties were analyzed.Results indicate that the adhesion of the prepared dual-layer composite TBCs is excellent,and no noticeable cracks appear at the interface.Compared with the MoSi_(2)coating with a low fracture toughness(0.88 MPa·m^(1/2)),the Gd_(2)Zr_(2)O_(7)coating exhibits higher fracture toughness(1.74 MPa·m^(1/2))and stronger resistance to crack propagation.The prepared MoSi_(2)-Gd_(2)Zr_(2)O_(7)composite coatings have a high porosity(39%),low thermal conductivity(1.020 W·(m·K)^(−1),1200℃),and low thermal diffusivity(0.249 mm^(2)/s,1200℃).Additionally,they possess a high oxygen-vacancy concentration,which ensures excellent insulation performance.展开更多
文摘以NH4VO3和Mn CO3为原料,采用水热法制备了Mn2V2O7纳米棒,采用X射线衍射(XRD)及场发射扫描电子显微镜(FE-SEM)对样品的结构和形貌进行了表征,并对其反应机理进行了探讨。以Mn2V2O7纳米棒作为锂离子电池的负极材料,对其电化学储锂性能进行了初步研究。结果表明:Mn2V2O7纳米棒在50 m A/g条件下的首次放电比容量为962.4 m Ah/g,循环50周后其放电比容量可稳定在389.4 m Ah/g,显示出较好的循环性能。
基金Supported by Scientific and Technological Innovation of Shaanxi Provincial State-Owned Capital Operation Budget(2022-056)Institute's Self-Developed Technology Program(0801YK2317)+4 种基金Qin Chuangyuan Cites High-Level Innovation and Entrepreneurship Talent Program(QCYRCXM-2023-120)Qin Chuangyuan Industry Cluster Zone“Four Chains”Integration Program(2024CY-JJQ-46)National Natural Science Foundation of China(52071274)Key Research and Development Projects of Shaanxi Province(2023-YBGY-442)Science and Technology Nova Project-Innovative Talent Promotion Program of Shaanxi Province(2020KJXX-062)。
文摘Dual-layer thermal barrier coatings(TBCs)with ultrahigh temperature resistance were prepared on the surface of molybdenum-rhenium alloy hot-end components.The preparation of the MoSi_(2)-Gd_(2)Zr_(2)O_(7)dual-layer TBCs was designed based on the coefficient of thermal expansion and the coating functionality,and it was completed using atmospheric plasma spraying technique.The microstructure,mechanical properties,and thermal properties were analyzed.Results indicate that the adhesion of the prepared dual-layer composite TBCs is excellent,and no noticeable cracks appear at the interface.Compared with the MoSi_(2)coating with a low fracture toughness(0.88 MPa·m^(1/2)),the Gd_(2)Zr_(2)O_(7)coating exhibits higher fracture toughness(1.74 MPa·m^(1/2))and stronger resistance to crack propagation.The prepared MoSi_(2)-Gd_(2)Zr_(2)O_(7)composite coatings have a high porosity(39%),low thermal conductivity(1.020 W·(m·K)^(−1),1200℃),and low thermal diffusivity(0.249 mm^(2)/s,1200℃).Additionally,they possess a high oxygen-vacancy concentration,which ensures excellent insulation performance.
