Synthesis and characterization of Ag-8 %wt Cr2O3 composites prepared by different densification processes

Abstract

A novel Ag-8 %wt Cr 2 O 3 composite prepared via powder metallurgy route. Silver and chromium oxides were used as starting powders. The powder mixtures were mechanically milled by a SPEX high energy mill for 5 h. Based on the thermogravimetric analysis (TGA) and X-Ray Diffraction (XRD) results, the milled powders were calcined in an argon atmosphere at 550 °C. During calcination, the silver oxide decomposed into silver. The results showed that the Heckel equation was the preferred one for description the cold compressibility of the powders. The calcined powders were consolidated by Press-Sinter-Repress (PSR), Press-Sinter-Repress-Anneal (PSRA) and Spark Plasma Sintering (SPS) processes. The Field Emission Scanning Electron Microscope (FESEM) investigations showed a nearly dense microstructure of the sintered samples. However, the hardness of the pressed-sintered-repressed samples was 81 Vickers which was the highest among the processed specimen. Furthermore, the flexural strength of the PSR and SPS processed samples were 231 and 255 MPa, respectively which were too higher than that of the annealed specimens. The results confirmed the effect of microstructural parameters such as Cr 2 O 3 particle size and processing route on the mechanical properties of the sintered composites.

Sintering in global material perspective

“…Aluminum-Ceramic composites, historically, have major commercial applications in the automotive sector. Other applications are for electronic /thermal management including contact materials [22].…”

Sinterability and characterization of Ag/Al2O3 metal and ceramic matrix composites processed by mechanical milling

“…In these kinds of materials, silver can be as used as the matrix or the reinforcement phase. Various metals and compounds such as SnO 2 , ZnO, MoS 2 , WC, Cr 2 O 3 , CdO, TiB 2 , W, Ni, Mo, Fe, and Al 2 O 3 have been used in SCCs as the reinforcement or matrix phase [1][2][3][4][5][6][7]. In SCCs, the existence of a metal such as silver which has the highest electrical conductivity among metals improves the electrical and thermal conductivity of the composite.…”

Antimicrobial effects of carbonaceous material functionalized with silver

“…[13][14][15][16]. Beside its antimicrobial action, the effect of silver nanoparticles are also investigated for it good characteristics toward the porosity decrease and the density increase, as well enhanced the hardness and fracture toughens of the Silver matrix composites [17,18].…”