Abstract
In this research, the sinterability of Ag/Al2O3 milled powders with 10 and 90 wt%Ag were investigated. The powders were consolidated by two different processes including conventional and spark plasma sintering. The conventionally sintered composites with 90 wt%Ag were further densified by cold pressing and subsequent annealing at 700?C. The microstructural evaluations confirmed a fine dispersion of the constituents within the microstructure of the spark plasma sintered composites. Moreover, the results showed that the relative density, hardness, and flexural strength of the spark plasma sintered samples were much higher than those of the other samples. The hardness and flexural strength of Ag/10 wt%Al2O3 spark plasma sintered samples at 650?C were 146 HV and 264 MPa, respectively. However, unlike the composite with 90 wt%Ag, the applied sintering temperatures have not led to the synthesis of an Ag/90 wt% Al2O3 composite with the desired properties
Highlights
Silver containing composites (SCCs) are widely used in various industrial components like high voltage circuit breakers, motor governors, relays, and cutting tools
The mechanical milling has led to a reduction of particle size for both groups of the samples
The homogenous dispersion of the elements in the microstructure of the powder would lead to the synthesis of a sintered microstructure with fine and homogenous dispersion of the constituents
Summary
Silver containing composites (SCCs) are widely used in various industrial components like high voltage circuit breakers, motor governors, relays, and cutting tools. In these kinds of materials, silver can be as used as the matrix or the reinforcement phase. Casting and powder metallurgy are the two applied processes for producing both kinds of the above-mentioned silver-containing composites [9,10,11]. Hydrothermal processes, mechanical milling, chemical routes, and hot mechano-chemical processing are some of the applied methods for the synthesis of Ag containing powder mixtures with a fine dispersion of the composite components. To prevent the silver evaporation, the sintering behavior of the powder compacts was conducted on relatively low temperatures
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