一种混合粉末用粘结剂的研发

Research and development of a type of binder for premix powder

为减少混粉过程中成分偏析、提高粉末质量,研究出一种专门用于粉末混合的粘结剂。通过调节粘结剂的配比(0~2.0%,质量分数),制备了Fe-2.0Cu-0.8C、0.5MoFe-1.5Cu-1.8Ni-0.5C和0.5MoFe-1.5Cu-3.8Ni-0.7C等共7个批次的混合粉末。用扫描电子显微镜(SEM)和光学显微镜(OM)观察粉末颗粒形貌、分布状态和烧结后材料的相组成,并用力学测试仪测量其横向断裂强度。结果表明:添加粘结剂可以有效降低粉末的成分偏析,大幅度减少制备和使用过程中的扬尘,提高粉末的松装密度和烧结后的尺寸一致性,改善粉末流动性和压缩性。当粘结剂添加质量分数为1.6%时,粉末的综合性能最佳。利用该粘结剂配方制备两种粉末的粘结效果达到国外同类粘结粉末水平。

In order to reduce the segregation of mixed-powder and improve the powder quality,a new kind of binder for powder mixture was developed. Seven batches of Fe-2.0Cu-0.8C,0.5MoFe-1.5Cu-1.8Ni-0.5C and 0.5MoFe-1.5Cu-3.8Ni-0.7C were prepared by adding different binder concentration(0-2.0%). Using scanning electron microscope(SEM)and optical microscope(OM)to observe the morphology of powder composition,distribution and phase composition of the sintered sample,the mechanical tester was used to measure the transverse rupture strength of the samples. Results show that adding binder effectively reduces the powder segregation,greatly reduces the dust in the process of blending and using,improves the consistency and apparent density of samples. It also improves the fluidity and compressibility of the mixed-powder. The combined performance of powder is optimal when the binder content of 1.6%. The adhesion effect of the two kinds of mixed-powders prepared by using this binder are able to achieve the same level of imported mixed-powders.