The Influence of Amorphous Nanosized Mo and M0O 2 Fillers on the Tribological Properties of Polymer-based Composite Mate
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Q8.12.1
The Influence of Amorphous Nanosized Mо and MоO2 Fillers on the Tribological Properties of Polymer-based Composite Materials Malkhasyan R.T., Pogosian A.K.1, Makaryan V.K., Isajanyan A.R.1 Scientific Production Enterprise “ATOM”, Tevosyan 3/1, Yerevan 375076, Armenia 1 State Engineering University of Armenia, Teryan 105, Yerevan 375009, Armenia
ABSTRACT The problems of the creation of composite polymer-based materials with the use of amorphous nanosized molybdenum and molybdenum dioxide fillers with the particle size of less than 5 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 amorphous nanosized fillers and crystalline microsized analogues is made. It is determined that the use of isotropic nanosized amorphous fillers leads to improved wear-resistance up to three times for CFD-based composites and up to an order for PPS-based ones. INTRODUCTION The use of various fillers enables considerable improvement of the physical-mechanical properties of primary polymer matrix. The wide spectrum of materials including metals and oxides, multi-component complex chemical compounds, minerals as well as organic compounds is used as fillers for composite polymer-based materials. The type of the chosen filler is conditioned by those characteristics of polymer, which are subject to change with the help of the given filler. Thus, graphite, talc and molybdenum disulphide are well-known antifriction fillers. The mentioned materials, which are referred to as dry lubricants, possess an ability to form films on the friction surfaces, decreasing the friction and wear. But sometimes dry lubricants don't fit well into the polymer matrix structure and lower the mechanical properties of composite material. For this reason the right selection of filler, which is capable to ensure required tribological, mechanical and other properties [1] is the main direction for the creation of composite polymer-based materials. The peculiarities of nanosized fillers usage are of particular interest in this study. EXPERIMENTAL The polymer matrixes used in this study are: a) the copolymer of formaldehyde and dioxolan (CFD), which belongs to acetal group and is widely used as materials for sliding bearings, gears and guides and b) the polyphenylene sulphide (PPS), which is an antifriction material with excellent mechanical properties, thermal and size stability. The fillers used are: a) amorphous molybdenum with particle size of 5 nm, and b) amorphous MoO2 with particle size of 5 nm, and c) crystalline molybdenum with average particle size of 1 µm. It should be noted that the nanosized amorphous molybdenum because of its high reactivity rapidly oxidizes to amorphous MoO2 during sample preparation process, and the concentration of latter in samples is about 30-40%. Amorphous nanosized fraction of fillers was obtained with
Q8.12.2
use of quantum-chemical technology of synthesis
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