According to the principle that fiber-like arrangement of reinforcing particles SnO2 paralleling to the direction of current is propitious to the electrical and mechanical performance of the electrical contact materia...According to the principle that fiber-like arrangement of reinforcing particles SnO2 paralleling to the direction of current is propitious to the electrical and mechanical performance of the electrical contact materials, we proposed and reported a novel precursor route used to prepare Ag/SnO,. electrical contact material with fiber- like arrangement of reinforcing nanoparticles. The mechanism for the formation of fiber-like arrangement of rein- forcing nanoparticles in Ag/SnO2 electrical contact material was also discussed. The as-prepared samples were char- acterized by means of scanning electron microscope （SEM）, optical microscope （OM）, energy-dispersive X-ray spectroscopy （EDX）, MHV2000 microhardness test, and double bridge tester. The analysis showed that the as-prepared Ag/SnO,, electrical contact material with fiber-like arrangement of reinforcing nanoparticles exhibits a high elongation of 24 %, a particularly low electrical resistivity of 2.08 μΩ. cm, and low arcing energy, and thus has considerable technical, economical and environmental benefits.展开更多
Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken...Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken, and arc easily moved and have smaller contact resistance. In this paper, La2O3 is used as a stable oxide in contact material to replace CdO. A new type of Ag/SnO2-La2O3-Bi2O3 contact material is first obtained through using powder metallurgical method. Then electrical contact material parameter tester is used to test the electrical contact performance of the contact material. Through experiments, the arcing voltage and current curves, arcing energy curves, fusion power curves while broken and contact resistance while closed were obtained. Analysis of the results showed that the addition of La2O3 makes the contact material have the following advantages: smaller electrical wear, smaller arc energy, smaller contact resistance and arc is more easily extinguished.展开更多
To clarify the effect of SnO2 particle size on the arc erosion behavior of AgSnO2 contact material, Ag?4%SnO2 (mass fraction) contact materials with different sizes of SnO2 particles were fabricated by powder metallur...To clarify the effect of SnO2 particle size on the arc erosion behavior of AgSnO2 contact material, Ag?4%SnO2 (mass fraction) contact materials with different sizes of SnO2 particles were fabricated by powder metallurgy. The microstructure of Ag?4%SnO2 contact materials was characterized, and the relative density, hardness and electrical conductivity were measured. The arc erosion of Ag?4%SnO2 contact materials was tested, the arc duration and mass loss before and after arc erosion were determined, the surface morphologies and compositions of Ag?4%SnO2 contact materials after arc erosion were characterized, and the arc erosion mechanism of AgSnO2 contact materials was discussed. The results show that fine SnO2 particle is beneficial for the improvement of the relative density and hardness, but decreases the electrical conductivity. With the decrease of SnO2 particle size, Ag?4%SnO2contact material presents shorter arc duration, less mass loss, larger erosion area and shallower arc erosion pits.展开更多
Ag/SnO2,as a promising and environment-friendly electrical contact material,is widely applied in low-voltage apparatus.But the properties of Ag/SnO2 composites is difficult to improve due to the poor distribution phas...Ag/SnO2,as a promising and environment-friendly electrical contact material,is widely applied in low-voltage apparatus.But the properties of Ag/SnO2 composites is difficult to improve due to the poor distribution phases and difficult component design.In this work,the Ag/SnO2 composites are prepared by selective laser melting.To get better performance,Ag/SnO2 composites with different energy density were studied.The microstructure was observed by field emission scanning electron microscope.In addition,reinforced SnO2 phase was characterized by X-ray diffraction and transmission electron microscope.The results indicated that the microstructure,relative density and hardness of are influenced by energy density,while Ag/SnO2 composites with homogeneous microstructure,high relative density,higher hardness and lower electrical resistivity can be obtained by proper energy density(E?68 J/mm^3).展开更多
系统研究了Ag Sn In Ni合金内氧化法制备Ag-Sn O_(2)-In_(2)O_(3)-Ni O电接触材料的微观组织演变机理及氧化物颗粒分布的调控。结果表明,退火工艺决定了Ag Sn In Ni的缺陷状态,随退火温度的升高,合金中缺陷密度降低,内氧化速度减慢。内...系统研究了Ag Sn In Ni合金内氧化法制备Ag-Sn O_(2)-In_(2)O_(3)-Ni O电接触材料的微观组织演变机理及氧化物颗粒分布的调控。结果表明,退火工艺决定了Ag Sn In Ni的缺陷状态,随退火温度的升高,合金中缺陷密度降低,内氧化速度减慢。内氧化过程中银合金同时发生回复与再结晶,但内氧化形成的Sn O_(2)和In_(2)O_(3)颗粒可钉扎位错、亚晶界等缺陷,抑制再结晶的发生。Ag-Sn O_(2)-In_(2)O_(3)-Ni O合金微观组织的差异是O原子沿着缺陷向样品内部扩散与Ag合金基体发生再结晶的相互竞争的结果,这导致了芯部组织为氧化物密度较低的颗粒状分布,而外侧组织为氧化物颗粒沿着缺陷墙呈现束装聚集分布。退火工艺为550℃/2 h、氧化工艺为700℃/0.3 MPa×26 h时,可获得氧化物尺寸和分布一致性高的Ag-Sn O_(2)-In_(2)O_(3)-Ni O材料。展开更多
本文研究了掺杂纳米氧化物的 Ag Sn O2 触头材料的制备过程。分析了溶胶 -凝胶法制备的纳米Sn O2 - Ti O2 的结构与性能的关系 ,由于 Ti4+离子能够进入 Sn O2 晶格 ,使触头导电率得以提高。通过对纳米 Ag Sn O2 触头材料与粉末法制备的 ...本文研究了掺杂纳米氧化物的 Ag Sn O2 触头材料的制备过程。分析了溶胶 -凝胶法制备的纳米Sn O2 - Ti O2 的结构与性能的关系 ,由于 Ti4+离子能够进入 Sn O2 晶格 ,使触头导电率得以提高。通过对纳米 Ag Sn O2 触头材料与粉末法制备的 Ag Sn O2 触头材料性能的对比 ,得出纳米 Ag Sn O2展开更多
基金National Major Scientific&Technological Achievement Transformation Project
文摘According to the principle that fiber-like arrangement of reinforcing particles SnO2 paralleling to the direction of current is propitious to the electrical and mechanical performance of the electrical contact materials, we proposed and reported a novel precursor route used to prepare Ag/SnO,. electrical contact material with fiber- like arrangement of reinforcing nanoparticles. The mechanism for the formation of fiber-like arrangement of rein- forcing nanoparticles in Ag/SnO2 electrical contact material was also discussed. The as-prepared samples were char- acterized by means of scanning electron microscope （SEM）, optical microscope （OM）, energy-dispersive X-ray spectroscopy （EDX）, MHV2000 microhardness test, and double bridge tester. The analysis showed that the as-prepared Ag/SnO,, electrical contact material with fiber-like arrangement of reinforcing nanoparticles exhibits a high elongation of 24 %, a particularly low electrical resistivity of 2.08 μΩ. cm, and low arcing energy, and thus has considerable technical, economical and environmental benefits.
基金Project (No. 502048) supported by the Natural Science Foundation of Hebei Province, China
文摘Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken, and arc easily moved and have smaller contact resistance. In this paper, La2O3 is used as a stable oxide in contact material to replace CdO. A new type of Ag/SnO2-La2O3-Bi2O3 contact material is first obtained through using powder metallurgical method. Then electrical contact material parameter tester is used to test the electrical contact performance of the contact material. Through experiments, the arcing voltage and current curves, arcing energy curves, fusion power curves while broken and contact resistance while closed were obtained. Analysis of the results showed that the addition of La2O3 makes the contact material have the following advantages: smaller electrical wear, smaller arc energy, smaller contact resistance and arc is more easily extinguished.
基金Project(51274163)supported by the National Natural Science Foundation of ChinaProject(13JS076)supported by the Key Laboratory Research Program of Shaanxi Province,China+1 种基金Project(2012KCT-25)supported by the Pivot Innovation Team of Shaanxi Electrical Materials and Infiltration Technique,ChinaProject(2011HBSZS009)supported by the Special Foundation of Key Disciplines,China
文摘To clarify the effect of SnO2 particle size on the arc erosion behavior of AgSnO2 contact material, Ag?4%SnO2 (mass fraction) contact materials with different sizes of SnO2 particles were fabricated by powder metallurgy. The microstructure of Ag?4%SnO2 contact materials was characterized, and the relative density, hardness and electrical conductivity were measured. The arc erosion of Ag?4%SnO2 contact materials was tested, the arc duration and mass loss before and after arc erosion were determined, the surface morphologies and compositions of Ag?4%SnO2 contact materials after arc erosion were characterized, and the arc erosion mechanism of AgSnO2 contact materials was discussed. The results show that fine SnO2 particle is beneficial for the improvement of the relative density and hardness, but decreases the electrical conductivity. With the decrease of SnO2 particle size, Ag?4%SnO2contact material presents shorter arc duration, less mass loss, larger erosion area and shallower arc erosion pits.
基金sponsored by the Natural Science Foundation of China (Grant nos. 51775208)the Hubei Science Fund for Distinguished Young Scholars (No. 0216110085)+2 种基金the National Key Research and Development Program “Additive Manufacturing and Laser Manufacturing”(No. 2016YFB1100101)Wuhan Morning Light Plan of Youth Science and Technology (No. 0216110066)the Academic frontier youth team at Huazhong University of Science and Technology (HUST)
文摘Ag/SnO2,as a promising and environment-friendly electrical contact material,is widely applied in low-voltage apparatus.But the properties of Ag/SnO2 composites is difficult to improve due to the poor distribution phases and difficult component design.In this work,the Ag/SnO2 composites are prepared by selective laser melting.To get better performance,Ag/SnO2 composites with different energy density were studied.The microstructure was observed by field emission scanning electron microscope.In addition,reinforced SnO2 phase was characterized by X-ray diffraction and transmission electron microscope.The results indicated that the microstructure,relative density and hardness of are influenced by energy density,while Ag/SnO2 composites with homogeneous microstructure,high relative density,higher hardness and lower electrical resistivity can be obtained by proper energy density(E?68 J/mm^3).
文摘系统研究了Ag Sn In Ni合金内氧化法制备Ag-Sn O_(2)-In_(2)O_(3)-Ni O电接触材料的微观组织演变机理及氧化物颗粒分布的调控。结果表明,退火工艺决定了Ag Sn In Ni的缺陷状态,随退火温度的升高,合金中缺陷密度降低,内氧化速度减慢。内氧化过程中银合金同时发生回复与再结晶,但内氧化形成的Sn O_(2)和In_(2)O_(3)颗粒可钉扎位错、亚晶界等缺陷,抑制再结晶的发生。Ag-Sn O_(2)-In_(2)O_(3)-Ni O合金微观组织的差异是O原子沿着缺陷向样品内部扩散与Ag合金基体发生再结晶的相互竞争的结果,这导致了芯部组织为氧化物密度较低的颗粒状分布,而外侧组织为氧化物颗粒沿着缺陷墙呈现束装聚集分布。退火工艺为550℃/2 h、氧化工艺为700℃/0.3 MPa×26 h时,可获得氧化物尺寸和分布一致性高的Ag-Sn O_(2)-In_(2)O_(3)-Ni O材料。
文摘本文研究了掺杂纳米氧化物的 Ag Sn O2 触头材料的制备过程。分析了溶胶 -凝胶法制备的纳米Sn O2 - Ti O2 的结构与性能的关系 ,由于 Ti4+离子能够进入 Sn O2 晶格 ,使触头导电率得以提高。通过对纳米 Ag Sn O2 触头材料与粉末法制备的 Ag Sn O2 触头材料性能的对比 ,得出纳米 Ag Sn O2
