Study on Microstructure and Properties of Cu-WC-Y Composites Prepared by Microwave Sintering AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:TB333[一般工业技术—材料科学与工程]

Citation Information:

Copper alloys are extensively utilized in electronics,aerospace,and mechanical manufacturing sectors owing to their superior electrical conductivity,thermal conductivity,and mechanical properties.With the progression of high-end equipment towards enhanced performance,traditional single-phase dispersion-strengthened copper alloys struggle to meet the increasingly rigorous service requirements.Consequently,there is a pressing need for the development of high-performance dual-phase dispersion-strengthened co-pper alloys.This study employed microwave sintering to prepare Cu-3%WC-xY composites and investiga-ted the effects of different microwave sintering processes,Y addition amount,and annealing processes on their microstructure and comprehensive properties.The results reveal that as the microwave sintering tem-perature increases,the surface porosity of Cu-3%WC-0.15%Y composites decreases significantly,while their relative density,hardness,electrical conductivity,flexural strength,and yield strength increase gradu-ally.Prolonging the sintering time results in a gradual increase in the grain size of Cu-3%WC-0.15%Y composites,accompanied by rising electrical conductivity and relative density,while the hardness,flexural strength,and yield strength first increase and then decrease.With increasing Y addition amount,the rela-tive density and hardness of Cu-3%WC-xY composites first increase and then decrease,while the electrical conductivity exhibits an overall downward trend.Moreover,Y in the composites is mainly segregated around WC particles,which improves interfacial bonding and strengthens the material.Under the optimized conditions of a microwave sintering temperature of 1050℃,a sintering time of 90 min,and a Y addition amount of 0.15%,the Cu-3%WC-xY composite demonstrates relatively favorable comprehensive proper-ties:Its relative density,electrical conductivity,hardness,flexural strength,and yield strength are 86.4%,66.1%IACS,54.8 HV,270.73 MPa,and 28.96 MPa,respectively.Elevating the annealing temperature or extending the annealing time leads to grain coarsening in Cu-3%WC-0.15%Y composites and a notable en-hancement in electrical conductivity.When annealed at 800℃for 2 h,the composite exhibits an electrical conductivity of 77.1%IACS,an increase of 16.64%compared with the unannealed sample.