Preparation And Characterization Of 3D-Fe Network Reinforced Cu/Graphitefriction Materials

The three-dimensional network of metal matrix composites is in continuous 3D mesh structure reinforced phase infused into the matrix metal and other components. The matrix and reinforced phase mutual penetration and support throughout each other. Interoperability of the organization enhances the three-dimensional network of metal matrix composites to resist the ability of various damage forms. In addition, the composites are also retained the advantages of both matrix and reinforced phase to make it has the potential to become a new type of friction material.As a representative of three-dimensional metal network, 3D-Fe has some advantages such as cheap price, high compressive strength, good workability over other 3D metal materials However, reports about 3D-Fe as a reinforced phase are very rare. We will take different forms of iron(iron powder and 3D-Fe) as the main reinforced phase and homemade ternary laminated ceramic Ti2 Al C prepared by combustion synthesis as auxiliary reinforced phase and commonly used metal Cu in friction materials as matrix. The graphite and Cr respectively as the lubrication and friction component are used to prepare Cu-based powder metallurgy friction materials. We will study their microstructure, physical properties, mechanical properties, friction and wear performance, which is detailed as follows:Firstly, 35vol% is determined as the best powder loading capacity, binder is 79wt%PW+10wt%EVA+10wt%LDPE+1wt%SA. Adopt the method of subsection slowly heated to 550°C for 3D-Fe /Cu friction materials to skim. Cu-based friction materials were fabricated by hot-pressing process.At 950°C, Cu-based friction materials with different Fe and Ti2 Al C contents were prepared. The iron and Ti2 Al C are in the range of 20wt% ~ 35wt% and 1wt% ~ 7wt%, respectively. Fe with different forms was formed Fe Cu4 solid solution in the Cu. With increasing Ti2 Al C content, the relative density, hardness and strength of Fe/Cu friction materials gradually reduced, but the opposite is true in 3D-Fe/Cu ones. The strength of 3D-Fe/Cu friction materials was lower than that of Fe/Cu ones with same chemical composition.The friction coefficient and wear rate of the two materials overall decrease with increasing speed. Compared with the Fe/Cu friction materials, the friction process of 3D-Fe/Cu friction materials is more smoothly, with the smaller fluctuations of friction coefficient and wear rate. The addition of Ti2 Al C improves the stability of friction coefficient of friction materials under different speed, and such influence was strengthened in 3D-Fe/Cu friction materials. The wear rate positively correlated with strength of Cu-based friction materials with Ti2 Al C.