Silver Matrix Composites - Structure and Properties

Abstract

Phase compositions of composite materials determine their performance as well as physical and mechanical properties. Depending on the type of applied matrix and the kind, amount and morphology of the matrix reinforcement, it is possible to shape the material properties so that they meet specific operational requirements. In the paper, results of investigations on silver alloy matrix composites reinforced with ceramic particles are presented. The investigations enabled evaluation of hardness, tribological and mechanical properties as well as the structure of produced materials. The matrix of composite material was an alloy of silver and aluminium, magnesium and silicon. As the reinforcing phase, 20-60 μm ceramic particles (SiC, SiO2, Al2O3 and Cs) were applied. The volume fraction of the reinforcing phase in the composites was 10%. The composites were produced using the liquid phase (casting) technology, followed by plastic work (the KOBO method). The mechanical and tribological properties were analysed for plastic work-subjected composites. The mechanical properties were assessed based on a static tensile and hardness tests. The tribological properties were investigated under dry sliding conditions. The analysis of results led to determination of effects of the composite production technology on their performance. Moreover, a relationship between the type of reinforcing phase and the mechanical and tribological properties was established.

Synthesis and Thermal Adsorption Characteristics of Silver-Based Hybrid Nanocomposites for Automotive Friction Material Application

“…It was due to the effect of phase transformation during high temperatures. It was decided as silver and reinforcement atomic structure [21]. It is distinct to 820°C of the intermediate phase and gets an effective thermal diffusivity of 15 mm 2 /sec.…”

“…In the future, silver-based metal matrix composites (SMMCs) will perform extraordinary (solid) lubrication effect and withstand the high thermal stress during high frictional force applied in aerospace motor applications, high friction bearing, and electrical contact applications [16][17][18][19][20]. However, few studies are available on silver matrix composite for automotive friction material applications [21]. Pure silver is characterized by low wear resistance and superior thermoelectrical conductivity.…”

Effect of Magnesium Powder Application on the Microstructure and Properties of Rods Extruded by the Forward-Backward Rotating Die Extrusion Method

“…In the case of the KOBO method, better mechanical properties were obtained after the application of cast alloys of aluminum [17,42,43], magnesium [44][45][46][47][48][49][50], and copper [51][52][53][54][55], as well as composite ingots with matrices of aluminum [56], magnesium [57], and silver matrix composites [58]. The application of magnesium powder to KOBO extrusion is a new technological concept, which requires studies covering potential rod fabrication from magnesium powders, shavings, and matrix composites with functional phases.…”

Effects of TiO2 Nanoparticle Addition on Microstructure and Selected Properties of Ag–xTiO2 Composites

“…Silver is also characterized by high plasticity, ductility and chemical durability [6]. To improve its strength properties and wear resistance, reinforcing phase particles are introduced into the silver matrix [7]. For example, Rigou et al [8], in their study, added diamond particles as suspension to the plating silver bath to improve the sliding wear behavior of silver-plated surfaces, which are normally characterized by low hardness and poor wear resistance.…”