The influence of four kinds of binders consisting of paraffin wax （PW）, random-polypropylene （RPP）, high-density polyethylene （HDPE）, and stearic acid （SA） on the theological behavior of injection-molded SiC f...The influence of four kinds of binders consisting of paraffin wax （PW）, random-polypropylene （RPP）, high-density polyethylene （HDPE）, and stearic acid （SA） on the theological behavior of injection-molded SiC feedstocks was investigated over a temperature range of 150℃ to 180℃ and a shear rate range of 4 s^-1 to 1259 s^^-1. The results showed that all the feedstocks exhibited pseudoplastic flow behavior. The wax-based binder of multipolymer components （PW-RPP-HDPE） exhibited better comprehensive rheological properties compared with the binder of monopolymer components （PW-RPP or PW-HDPE）. The addition of 5wt% SA to the binder could reduce the viscosity of the feedstock but enhance the rheological stability by improving the wettability between the binder and the SiC powder. The binder of 65wt% PW ＋ 15wt% HDPE ＋ 15wt% RPP ＋ 5wt% SA was found to be a better binder for microsized SiC injection molding.展开更多
Effect of rapid quenching on the electrochemical properties of AB5 and AB3.5-type hydrogen storage alloys was studied. The results indicated that the discharge capacities of the rapid quenching MmNi3.55Co0.75Mn0.4Al0....Effect of rapid quenching on the electrochemical properties of AB5 and AB3.5-type hydrogen storage alloys was studied. The results indicated that the discharge capacities of the rapid quenching MmNi3.55Co0.75Mn0.4Al0.3 alloys decrease under 25 and -35 ℃ with the increase of the quenching rate. Comparatively, the decrease extent of the quenching alloys at -35 ℃ is lower than that at 25 ℃. The result on the study of the cycle life indicated that the quenching process was favorable to improve the cycle stabilities of the MmNi3.55Co0.75-Mn0.4Al0.3 alloys under 25 and -35 ℃. Whereas, the effect of the quenching process on the La0.7Mg0.3(Ni0.85Co0.15)3.5 alloy was different at 25 ℃ from at -35 ℃. Under 25 ℃, the cycle life of the alloy was obviously improved by the quenching process, however, the quenching process did not improve but decreased slightly the cycle life at -35 ℃.展开更多
基金the National Natural Science Foundation of China(No.50274014)
文摘The influence of four kinds of binders consisting of paraffin wax （PW）, random-polypropylene （RPP）, high-density polyethylene （HDPE）, and stearic acid （SA） on the theological behavior of injection-molded SiC feedstocks was investigated over a temperature range of 150℃ to 180℃ and a shear rate range of 4 s^-1 to 1259 s^^-1. The results showed that all the feedstocks exhibited pseudoplastic flow behavior. The wax-based binder of multipolymer components （PW-RPP-HDPE） exhibited better comprehensive rheological properties compared with the binder of monopolymer components （PW-RPP or PW-HDPE）. The addition of 5wt% SA to the binder could reduce the viscosity of the feedstock but enhance the rheological stability by improving the wettability between the binder and the SiC powder. The binder of 65wt% PW ＋ 15wt% HDPE ＋ 15wt% RPP ＋ 5wt% SA was found to be a better binder for microsized SiC injection molding.
基金Project supported by National 863 Program (2006AA05Z132)MOE Programfor Changjiang Scholars and Innovative Research Teamin University (I2P407)
文摘Effect of rapid quenching on the electrochemical properties of AB5 and AB3.5-type hydrogen storage alloys was studied. The results indicated that the discharge capacities of the rapid quenching MmNi3.55Co0.75Mn0.4Al0.3 alloys decrease under 25 and -35 ℃ with the increase of the quenching rate. Comparatively, the decrease extent of the quenching alloys at -35 ℃ is lower than that at 25 ℃. The result on the study of the cycle life indicated that the quenching process was favorable to improve the cycle stabilities of the MmNi3.55Co0.75-Mn0.4Al0.3 alloys under 25 and -35 ℃. Whereas, the effect of the quenching process on the La0.7Mg0.3(Ni0.85Co0.15)3.5 alloy was different at 25 ℃ from at -35 ℃. Under 25 ℃, the cycle life of the alloy was obviously improved by the quenching process, however, the quenching process did not improve but decreased slightly the cycle life at -35 ℃.
