采用分段机械球磨-放电等离子烧结法,进行了节能变压器用新型非晶合金Fe77Si9B13Ce0.5Nb0.2Cr0.3,并进行了XRD、SEM分析和软磁性能、力学性能和耐腐蚀性能的测试。结果表明,与现有非晶合金Fe78Si9B13相比,该新型非晶合金的软磁性能、力...采用分段机械球磨-放电等离子烧结法,进行了节能变压器用新型非晶合金Fe77Si9B13Ce0.5Nb0.2Cr0.3,并进行了XRD、SEM分析和软磁性能、力学性能和耐腐蚀性能的测试。结果表明,与现有非晶合金Fe78Si9B13相比,该新型非晶合金的软磁性能、力学性能和耐腐蚀性能均得到明显改善,其中初始磁导率和饱和磁感应强度分别增加了70%、32%,20℃时试样的抗拉强度和伸长率分别增加36%、4.4%,腐蚀电位正移268 m V。展开更多
Mg-x(Ti0.9 Zr0.2 Mn1.5 Cr0.3)(x=20%,30%,40%) (mass fraction) composite powders were prepared by reactive ball milling with hydrogen and their hydrogen storage properties and microstructure were investigated by XRD,SEM...Mg-x(Ti0.9 Zr0.2 Mn1.5 Cr0.3)(x=20%,30%,40%) (mass fraction) composite powders were prepared by reactive ball milling with hydrogen and their hydrogen storage properties and microstructure were investigated by XRD,SEM and pressure-composition-temperature measurement.The results show that the composites have 3.83%-5.07%hydrogen capacity at 553 K and good hydrogenation kinetics,even at room temperature.Among them,the milled Mg-30%(Ti0.9Zr0.2Mn1.5Cr0.3)composite has the highest hydrogenation kinetics as it can quickly absorb 2.1%hydrogen at 373 K,3.5%in 2 000 s at 473 K,even 3.26%in 60 s at 553 K under 3 MPa hydrogen pressure.The improved hydrogenation properties come from the catalytic effect of Ti0.9 Zr0.2 Mn1.5 Cr0.3 particles dispersed uniformly on the surface of Mg particles.展开更多
Novel Co0.3Cr0.7Ox(x=2-3)particles with spinel structure were synthesized via precipitation method through the reactions among CoSO4,Cr(NO3)3 and NaOH solutions,followed by spray-drying and sintering at 1200 ℃for 4h ...Novel Co0.3Cr0.7Ox(x=2-3)particles with spinel structure were synthesized via precipitation method through the reactions among CoSO4,Cr(NO3)3 and NaOH solutions,followed by spray-drying and sintering at 1200 ℃for 4h in the air.The particles were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The XRD results revealed that the particles are composed of Co0.3Cr0.7Ox phase without the presence of other phases.The SEM observation showed that the particles are in the shape of sphere with well flowability.Infrared radiation test indicated that the total infrared normal emissivity of the coating made of Co0.3Cr0.7Ox can be up to 0.92 at 800℃.And the normal emissivities of the prepared Co0.3Cr0.7Ox particles are always slightly larger than those of CoCr2O4 particles prepared by solid-state reaction method in the test temperature range of 50-300℃.The relatively high thermal emissivity of Co0.3Cr0.7Ox is assumed to be mainly attributed to the spinel structure.These results indicated that Co0.3Cr0.7Ox particles are a good thermal radiation material,which can be used as infrared radiation layer in thermal protection system.展开更多
文摘采用分段机械球磨-放电等离子烧结法,进行了节能变压器用新型非晶合金Fe77Si9B13Ce0.5Nb0.2Cr0.3,并进行了XRD、SEM分析和软磁性能、力学性能和耐腐蚀性能的测试。结果表明,与现有非晶合金Fe78Si9B13相比,该新型非晶合金的软磁性能、力学性能和耐腐蚀性能均得到明显改善,其中初始磁导率和饱和磁感应强度分别增加了70%、32%,20℃时试样的抗拉强度和伸长率分别增加36%、4.4%,腐蚀电位正移268 m V。
基金Projects(20833009,20873148,U0734005) supported by the National Natural Science Foundation of ChinaProject(2010CB631303) supported by the National Basic Research Program of China+2 种基金Project(2009A11GX052) supported by Dalian Science and Technology Foundation,ChinaProject(KFJJ10-1Z) supported by the State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,ChinaProject(Y4090507) supported by the Zhejiang Basic Research Program of China
文摘Mg-x(Ti0.9 Zr0.2 Mn1.5 Cr0.3)(x=20%,30%,40%) (mass fraction) composite powders were prepared by reactive ball milling with hydrogen and their hydrogen storage properties and microstructure were investigated by XRD,SEM and pressure-composition-temperature measurement.The results show that the composites have 3.83%-5.07%hydrogen capacity at 553 K and good hydrogenation kinetics,even at room temperature.Among them,the milled Mg-30%(Ti0.9Zr0.2Mn1.5Cr0.3)composite has the highest hydrogenation kinetics as it can quickly absorb 2.1%hydrogen at 373 K,3.5%in 2 000 s at 473 K,even 3.26%in 60 s at 553 K under 3 MPa hydrogen pressure.The improved hydrogenation properties come from the catalytic effect of Ti0.9 Zr0.2 Mn1.5 Cr0.3 particles dispersed uniformly on the surface of Mg particles.
基金the National Natural Science Foundation of China(51001093)the Innovation Fund Project of Chinese Academy of Science(ZKYCX08D05)
文摘Novel Co0.3Cr0.7Ox(x=2-3)particles with spinel structure were synthesized via precipitation method through the reactions among CoSO4,Cr(NO3)3 and NaOH solutions,followed by spray-drying and sintering at 1200 ℃for 4h in the air.The particles were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The XRD results revealed that the particles are composed of Co0.3Cr0.7Ox phase without the presence of other phases.The SEM observation showed that the particles are in the shape of sphere with well flowability.Infrared radiation test indicated that the total infrared normal emissivity of the coating made of Co0.3Cr0.7Ox can be up to 0.92 at 800℃.And the normal emissivities of the prepared Co0.3Cr0.7Ox particles are always slightly larger than those of CoCr2O4 particles prepared by solid-state reaction method in the test temperature range of 50-300℃.The relatively high thermal emissivity of Co0.3Cr0.7Ox is assumed to be mainly attributed to the spinel structure.These results indicated that Co0.3Cr0.7Ox particles are a good thermal radiation material,which can be used as infrared radiation layer in thermal protection system.
