A new technique was proposed for preparation of LaNi5 powder by direct electrolytic deoxidation of solid La2O3–NiO mixture oxides in molten CaCl2–NaCl. Oxides pellets was sintered and used as cathode. High – density graphite was used as anode. Electrolysis was performed. Current change during electrolysis was recorded. XRD was used to analyse the composition of products. SEM was used to analysis surface and cross section of pellets before sintering, after sintering and after electrolysis. The preparation mechanism and the influences of sintering temperature and cell voltage on electrolytic deoxidation was studied. Results show that the optimum conditions to prepare LaNi5 are：NiO-La2O3（Ni:La=5:1）pellets are formed at 30MPa, sintered at 850°C for 5h, electrolyzed under 3.2V in CaCl2–NaCl melt at 850°C for more than 12 hours.

The fused deposition modeling rapid prototyping system is based on the manufacturing principle of layer by layer. The sprayer is the key component which achieves the fused deposition process. Based on the polymer rheological property, the structure design and theoretical analysis of the mini-plunger sprayer of SW2502 fused deposition modeling system are studied. The plasticizing capacity of the mini-plunger sprayer is analyzed in theoretically. It’s very important for the fused deposition modeling process to maintain a stable plasticizing capacity. The driving force of ABS feed is related to several process parameters such as structure form of sprayer and material property, etc. The barrel and nozzle design should be fit for mobility, purity and mechanical property of ABS feed. The modified ABS feed adopts self-pressure-adding driving method to conquer the pressure losses of barrel and nozzle. The plasticizing capacity of the sprayer is more than 20g/h.