Tungsten Alloy Injection Molding Technology Experimental Techniques And Methods

( 1 ) The tungsten powder , nickel powder , iron powder according to the proportion required weighed , the V-shaped blender mix 12h, speed 36r/min.

( 2 ) Preparation of Binder . Three types of experiments were prepared and ten kinds of binder ingredients , they are: wax Quito component adhesives, oil-based plastic binder system , ( Oil + Wax ) -based system to improve the plastic binder . Preparation of binder , the first binder were weighed according to the proportion of each component of the weight , the blender ohmic heating . Mixer until the temperature rose to a certain temperature, the first polymer by adding a certain amount of HDPE, PP, PS, PP, EVA , etc. Subject to soften the polymer melt , adding low molecular binder component PW, oil. Then add the coupling agent SA and DOP. Hybrid 0.5-2h , stop heating , pour the liquid binder , after cooling bag sealed to be done experiment.

( 3 ) Mixed Feeding . The W - Ni - Fe mixed powder and binder prepared in accordance with a certain proportion weighed , powder loading of 51%. First binder was added to XSS-300 torque rheometer , until melted , then add the metal powder mixture . Mixture temperature of 100 ~ 700 ℃, the PW series adhesives, compounding temperature is 115-125 ℃. For BO binder , mixing temperature of 180 ℃. For the OP series adhesives, mixing temperature is 140-165 ℃. Mixing time was 2h.

( 4 ) Granulation. Single- screw extruder using LSJ20 device will feed extruded strip , strip . Extruder, the feed and shear stress at a given temperature, the powder binder no separation phenomenon , while extruding the powder binder that a more uniform distribution . The screw speed in this experiment is 50r/min, extrusion material temperature is 110 ~ 160C.



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