The Influence of Nanosized Molybdenum and Tungsten Fillers on the Physico-Mechanical and Tribological Properties of Poly
- PDF / 42,439 Bytes
- 3 Pages / 612 x 792 pts (letter) Page_size
- 100 Downloads / 164 Views
0977-FF12-02
The Influence of Nanosized Molybdenum and Tungsten Fillers on the Physico-Mechanical and Tribological Properties of Polymer-based Composite Materials Victor Makaryan1,2 1 State Engineering University of Armenia, Yerevan, Armenia 2 Scientific Production Enterprise “MANE”, Yerevan, Armenia ABSTRACT The problems of the creation of composite polymer-based materials with the use of nanosized molybdenum and tungsten fillers with the particle size of less than 10 nm are considered. The copolymer of formaldehyde and dioxolane (CFD) and the polyphenylene sulphide (PPS) are chosen as polymeric matrixes. A comparative analysis of the tribological properties of composite materials with fine nanosized fillers (5-10 nm) and nanosized analogues (100-200) is made. It is determined that the use of nanosized amorphous structure Mo fillers leads to improved wearresistance up to three times for CFD-based composites and up to four times for PPS-based. The highest hardness values of composite materials are obtained when using amorphous nanosized tungsten fillers. Nanosized crystalline fillers give positive results as well, but their bigger size decreases the polymer hardness characteristics when compared to their nanosize amorphous analogues. INTRODUCTION The polymer-based composite materials are micro-heterogeneous systems, composed of two or more phases. One of the phases forms a continuous medium (the polymeric matrix) and includes the particles of other phases. The choice of filler depends on the characteristics of polymer matrix that we need to modify. Graphite, talc and molybdenum disulphide are well-known antifriction fillers. The mentioned materials, called dry lubricants, possess the ability to form films on the friction surfaces, decreasing the friction and wear. However, they do not always fit well into the polymer matrix structure and lower the mechanical properties of composite material [1-2]. For this reason, when creating a composite polymer-based material, the right selection of filler, choosing the optimum between tribological properties (wear-resistance, constant of friction) and physico-mechanical properties (tensile strength) becomes substantial. EXPERIMENTAL A set of composite materials based on the polyphenylene sulfide (PPS) and copolymer of formaldehyde and dioxolane (CFD) were chosen as research objects. The copolymer of formaldehyde and dioxolan (CFD), which belongs to acetal group, is an antifriction material with an extremely low constant of friction. The polyphenylene sulphide (PPS) is a wear resistant material with excellent mechanical properties. The following fillers were used: crystalline molybdenum and tungsten with particle sizes of 100-200 nm, obtained with special equipment [3] and amorphous structure molybdenum and tungsten with 5-10 nm particle size, obtained using quantum-chemical technology of nanoamorphous metal synthesis [4]. The sizes of powder grains were measured using a microscope “TESLA” BS 500 and their structures were measured using a diffractometer “Dron-3.”
Filler concen
Data Loading...
