A METHOD OF CONTROLLING THE DIMENSIONAL CHANGE TO A PREDETERMINED VALUE WHEN SINTERING A COMPACTED BODY OF A POWDER MIXTURE

摘要

The invention concerns a method of controlling the dimensional change to a predetermined value including the steps of providing a first powder (A) consisting of an iron based powder (1) and copper in the form of elemental copper (2), or copper diffusion-bonded to said iron-based powder (3); providing a second powder (B) consisting of said iron-based powder (1) and a pre-alloyed iron-copper powder (4); mixing said first and second powder mixtures (A) and (B) in proportions resulting in the desired dimensional change adding graphite and lubricant; compacting the obtained mixture; and sintering the compacted body.