磁控管用钼端帽的注射成形工艺

Metal injection molding process for molybdenum caps used in magnetron

将HL MIM1钼粉与石蜡-高分子体系粘结剂混合成金属注射成形(MIM)喂料,制备钼端帽。喂料循环使用8遍,研究最大注射压力、进料量和生坯质量的波动,并研究其烧结性能。结果表明:该钼粉喂料具有较高的临界装载量(57%,体积分数)和注射流变特性。粘结剂在多遍重复使用中稳定性好,没有明显的降解行为,注射坯的质量波动可控制在±1.5%以内。烧结后钼端帽的晶粒尺寸小于10μm,密度为10.05 g/cm3,高于用美国及德国的商用MIM钼粉制备的钼端帽。端帽的纯度高于99.95%,C和O含量分别为8×10-6和10×10-6。密度和纯度均满足产品使用要求,且工艺稳定性好,已实现工业化生产。

Molybdenum caps were prepared using molybdenum powder and wax-polymer binder mixture as feedstock.Feedstock was used by multiple recycling for 8 times to investigate the fluctuation of the maximum injection pressure,injection volume and green mass.The sinterability of the molded green bodies was also studied.The results show that the molybdenum feedstock has higher critical solid loading of 57% by volume fraction and good rheological property for injection.The developed binder has good stability and no evident decomposition is found during multiple recycling and injection.The fluctuation of green body mass can be controlled in the range of ±1.5%.The molybdenum caps with grain size less than 10 μm and density of 10.05 g/cm3 are obtained after sintering,which is higher than the molybdenum cap fabricated by using commercial MIM molybdenum powder from America and Germany.The purity of molybdenum cap is higher than 99.95% and the content of C and O is 8×10-6 and 10×10-6,respectively.The density and purity both meet the industry operating requirement,and the stability of the process is good.The application to produce molybdenum caps has been industrialized.