STRUCTURIZATION IN SINTERING OF ANTIFRICTION POWDER MATERIALS BASED ON IRON-COPPER ALLOYS

摘要

The paper studies the contact interaction of the components in powders Fe-(Cu + Sn), Fe-(Cu + Sn + P + Pb), and Fe + B-(Cu + Sn + P + Pb) during sintering in hydrogen at 920 deg C. It is shown that this interaction is responsible for the formation of both the interphase boundary and the general structure that defines the performance characteristics of an antifriction material. The interface and the phase and chemical composition of the products of interaction are examined. It is established that the powder composition Fe + Cu + Sn + P + B + Pb sintered in hydrogen at 920 deg C is a microheterogeneous material whose matrix, which takes up the major load during friction, includes two phases: one based on iron alloyed with boron (Fe_2B), copper, tin, and phosphorus and the other based on copper including tin in the form of a-solid solution, phosphorus in the form of Cu_3P, and iron. Lead uniformly distributed over the matrix volume is the antifriction component of the material.