在弱碱性（ｐＨ：10～11无机水基电解液中，针对YG类硬质合金材料，采用双极性脉冲电流电解一磨料流喷射的电液束复合加工方法，对加工机理及加工过程进行了初步的分析和研究．在实验的基础上，总结出电参数、电解液参数等主要工艺参数...在弱碱性（ｐＨ：10～11无机水基电解液中，针对YG类硬质合金材料，采用双极性脉冲电流电解一磨料流喷射的电液束复合加工方法，对加工机理及加工过程进行了初步的分析和研究．在实验的基础上，总结出电参数、电解液参数等主要工艺参数对材料去除率、加工精度、表面粗糙度、电流效率等工艺性能指标的作用规律，并获得了较好的加工效果．其中，材料去除率最高为130mm3／min，加工精度达0．08mm． 表面粗糙度达 Ra 0．4 μm．展开更多
4.25Cu-0.75Ni/NiFe2O4 cermets were prepared by doping NiFe2O4 ceramic matrix with the mixed powders of Cu and Ni or Cu-Ni alloy powder as the electrical conducting metallic elements. The effects of technological param...4.25Cu-0.75Ni/NiFe2O4 cermets were prepared by doping NiFe2O4 ceramic matrix with the mixed powders of Cu and Ni or Cu-Ni alloy powder as the electrical conducting metallic elements. The effects of technological parameters, such as the adding modes of metallic elements, the ball milling time, the sintering time and the sintering temperature, on the relative density and resistivity of the cermets were studied. The results show that the resistivity of 4.25Cu-0.75Ni/NiFe2O4 cermets decreases with increasing temperature, and has a turning point at 590℃, which is similar to that of NiFe2O4 ceramic. The sintering temperature and adding modes of metallic elements have a great influence on the properties of 4.25Cu-0.75Ni/NiFe2O4 cermets. When the sintering temperature increases from 1200℃ to 1300℃, the relative density increases from 89.86% to 95.33%, and the resistivity at 960℃ decreases from 0.11Ω·cm to 0.03Ω·cm, respectively. When the metallic elements are added with the mixed powders of Cu and Ni, the cermets of finely and uniformly dispersed metallic phase, high density and electric conductivity are obtained. The relative density and resistivity at 960℃ are 90.23% and 0.04Ω·cm respectively for the cermet samples sintered at 1200℃ for 2h, which are both better than those of the cermets prepared under the same technique conditions but with the metallic elements added as 85Cu-15Ni alloy powders.展开更多
文摘在弱碱性（ｐＨ：10～11无机水基电解液中，针对YG类硬质合金材料，采用双极性脉冲电流电解一磨料流喷射的电液束复合加工方法，对加工机理及加工过程进行了初步的分析和研究．在实验的基础上，总结出电参数、电解液参数等主要工艺参数对材料去除率、加工精度、表面粗糙度、电流效率等工艺性能指标的作用规律，并获得了较好的加工效果．其中，材料去除率最高为130mm3／min，加工精度达0．08mm． 表面粗糙度达 Ra 0．4 μm．
文摘4.25Cu-0.75Ni/NiFe2O4 cermets were prepared by doping NiFe2O4 ceramic matrix with the mixed powders of Cu and Ni or Cu-Ni alloy powder as the electrical conducting metallic elements. The effects of technological parameters, such as the adding modes of metallic elements, the ball milling time, the sintering time and the sintering temperature, on the relative density and resistivity of the cermets were studied. The results show that the resistivity of 4.25Cu-0.75Ni/NiFe2O4 cermets decreases with increasing temperature, and has a turning point at 590℃, which is similar to that of NiFe2O4 ceramic. The sintering temperature and adding modes of metallic elements have a great influence on the properties of 4.25Cu-0.75Ni/NiFe2O4 cermets. When the sintering temperature increases from 1200℃ to 1300℃, the relative density increases from 89.86% to 95.33%, and the resistivity at 960℃ decreases from 0.11Ω·cm to 0.03Ω·cm, respectively. When the metallic elements are added with the mixed powders of Cu and Ni, the cermets of finely and uniformly dispersed metallic phase, high density and electric conductivity are obtained. The relative density and resistivity at 960℃ are 90.23% and 0.04Ω·cm respectively for the cermet samples sintered at 1200℃ for 2h, which are both better than those of the cermets prepared under the same technique conditions but with the metallic elements added as 85Cu-15Ni alloy powders.
