预混合粉末的研制

预混合粉末在防止化学成分偏析、提高混合粉流动性、改善生产现场环境方面有着明显的优势。其生产的零件相对于一般混合粉具有化学成分均匀、尺寸变化稳定、尺寸精度高和力学性能稳定的特点。本文针对Fe 1.0 %C 0 .7%Zn st预混合粉的生产工艺和粉末中石墨粉的被粘接情况进行了研究。研究结果表明 ,采用本工艺制造的预混合粉 ,与一般混合粉相比 ,在松装密度、压缩性相当的情况下 ,其流动性远远好于一般混合粉 ,而且其中的石墨颗粒能够被有效的粘接到铁颗粒表面上 ,从而达到防止偏析的目的

MANUFACTURE OF PRE-MIXED POWDER

Pre-mixed powder has obvious advantages in avoidance of segregation,flowability and environment friendliness.The parts made from such powder have more uniform chemical composition,more stable dimension change,higher dimension precision and more stable performance than the parts made from common mixed powder.The production technology and the graphite powder morphology of Fe-1.0 %C-0.7 %Zn-st pre-mixed powder are studied.The result indicate that,both the pre-mixed powder and common mixed powder have similar apparent density and compressibility,but the flowability of former is much better that of latter than.And graphite particles of pre-mixed powder are effectively bound on the iron particle surface,to prevent segregation.