Non-aligned and aligned polymer-bonded Tb0.3Dy0.7Fe2 composites with 20%particle volume fraction were prepared under different arrangement fields(i.e.0,10 kA/m,20 kA/m,30 kA/m,60 kA/m and 100 kA/m)during their gel pro...Non-aligned and aligned polymer-bonded Tb0.3Dy0.7Fe2 composites with 20%particle volume fraction were prepared under different arrangement fields(i.e.0,10 kA/m,20 kA/m,30 kA/m,60 kA/m and 100 kA/m)during their gel process.Static magnetostriction,dynamic magnetostriction,elastic modulus and compressive strength of all specimens were tested and compared. Experimental results indicate that all the parameters are positively dependent on the arrangement field.The dependence is significant at low field levels,the critical value of which is 30 kA/m for the composites fabricated.No obvious improvement of the properties can be observed for a larger field.Such critical values are defined as the optimal arrangement field to manufacture magnetostrictive composites.展开更多
The C15 Laves phase with composition Tb0.2Pr0.8（Fe0.4Co0.6）1.93 was synthesized by mechanical alloying （MA） and subsequent annealing process. The structure and magnetic properties of Tb0.2Pr0.8（Fe0.4Co0.6）1.93 w...The C15 Laves phase with composition Tb0.2Pr0.8（Fe0.4Co0.6）1.93 was synthesized by mechanical alloying （MA） and subsequent annealing process. The structure and magnetic properties of Tb0.2Pr0.8（Fe0.4Co0.6）1.93 were investigated by means of X-ray diffraction （XRD）, a vibrating sample magnetometer, and a standard strain technique. The effect of annealing on the structure and magnetic properties was studied. The analysis of XRD shows that the high Pr-content Tb0.2Pr0.8（Fe0.4Co0.6）1.93 alloy with the single phase of MgCu2-type structure can be successfully synthesized by MA method. The sample annealed at 450℃ is found to have a coercivity of 196 kA/m at room temperature. An epoxy/Tb0.2Pr0.8（Fe0.4Co0.6）1.93 composite was produced by a cold isostatic pressing technique. A large magnetostriction of 400 ppm, at an applied magnetic field of 800 kA/m, was found for the composite. The epoxy-bonded Tb0.2Pr0.8（Fe0.4Co0.6）1.93 composite combines a high magnetostriction with a significant coercivitv, which is a oromising magnetostrictive material.展开更多
基金Projects(50478024,50738002)supported by the National Natural Science Foundation of ChinaProject(2007CB714204)supported by the National Basic Research Program of China
文摘Non-aligned and aligned polymer-bonded Tb0.3Dy0.7Fe2 composites with 20%particle volume fraction were prepared under different arrangement fields(i.e.0,10 kA/m,20 kA/m,30 kA/m,60 kA/m and 100 kA/m)during their gel process.Static magnetostriction,dynamic magnetostriction,elastic modulus and compressive strength of all specimens were tested and compared. Experimental results indicate that all the parameters are positively dependent on the arrangement field.The dependence is significant at low field levels,the critical value of which is 30 kA/m for the composites fabricated.No obvious improvement of the properties can be observed for a larger field.Such critical values are defined as the optimal arrangement field to manufacture magnetostrictive composites.
基金supported by the National Natural Science Foundation of China (Nos. 50801039 and 50744014)It was also supported by the Natural Science Foundation of Zhejiang Province (Nos. Y406389)Ningbo City (Nos. 2007A610029 and 2005A610022)
文摘The C15 Laves phase with composition Tb0.2Pr0.8（Fe0.4Co0.6）1.93 was synthesized by mechanical alloying （MA） and subsequent annealing process. The structure and magnetic properties of Tb0.2Pr0.8（Fe0.4Co0.6）1.93 were investigated by means of X-ray diffraction （XRD）, a vibrating sample magnetometer, and a standard strain technique. The effect of annealing on the structure and magnetic properties was studied. The analysis of XRD shows that the high Pr-content Tb0.2Pr0.8（Fe0.4Co0.6）1.93 alloy with the single phase of MgCu2-type structure can be successfully synthesized by MA method. The sample annealed at 450℃ is found to have a coercivity of 196 kA/m at room temperature. An epoxy/Tb0.2Pr0.8（Fe0.4Co0.6）1.93 composite was produced by a cold isostatic pressing technique. A large magnetostriction of 400 ppm, at an applied magnetic field of 800 kA/m, was found for the composite. The epoxy-bonded Tb0.2Pr0.8（Fe0.4Co0.6）1.93 composite combines a high magnetostriction with a significant coercivitv, which is a oromising magnetostrictive material.
