注射成形钨合金用新型粘结剂的研究

Investigation on new type binder for injection molding tungsten alloy

针对形状异常复杂的大钨环和大直径 (≥ 2 0 .0 0mm)的钨棒在注射成形中存在的问题 ,综合利用了蜡基粘结剂与油基粘结剂的优点 ,研究制备一种多组元油 +蜡塑料体系改性粘结剂OP30 10。研究对比了该种粘结剂与传统蜡基粘结剂和油基粘结剂对注射料流变性、热性能及注射坯脱脂的影响。由此种新型粘结剂组成的注射料具有流变性好、注射工艺稳定、注射压坯强度高、注射温度范围宽、易于脱模等特点 ,可以成功制备无缺陷的大钨环、大钨棒弹芯材料的注射坯。该粘结剂在溶剂脱脂时脱除速度快 ,粘结剂脱除量大 ,可达74 %左右 ,而且脱脂后的毛坯强度高、不变形。可成功实现大钨棒和钨环的脱脂 。

In the light of the problems in the powder injection molding for big tungsten rings with extremely complicated shape and tungsten rods with big diameter, a new multicomponent (oil+wax) modified polymer binder, OP3010 was prepared by adopting the advantages of wax and oil based polymer binders. Compared to the conventional wax and oil based binders, the effects of the new binder on rheology, thermal properties and debinding of the feedstock were investigated. The results show that the feedstock consisting of the new binder has good rheological behavior, stable injection process, wide range of injection temperature and green compacts produced have high strength and are easy to eject. The new binder is successfully used to produce the green compacts of big tungsten rings and rods without defects for cannon-ball. When the binder is removed with solvent, the binder has high debinding rate up to 14%. The degreased compacts have high strength and no deformation. The debinding for big tungsten rod and rings can be successfully realized and the core material of cannon-ball with high combined mechanical properties can be produced.