Mechanical Properties and Chemical Resistance of New Composites for Oil Pump Impellers

Abstract

In this paper, a new class of high-performance composites and a method of their production based on the carbonization of an elastomeric matrix are proposed. The use of elastomeric matrix makes it possible to manufacture products with complex shapes, while the subsequent carbonization can significantly improve their properties by changing the chemical nature of the elastomeric matrix. Such an approach can reduce the products' machining cost, especially for composites reinforced with super hard fillers such as silicon carbide at high filling degrees. Low-temperature carbonization makes it possible to obtain composites with mechanical behavior similar to that of ceramics. In contrast to classical elastomeric materials, the nitrile butadiene rubber (NBR)-based compounds were highly filled (300 parts per hundred rubber-PHR) with different carbon fillers and silicon carbide; then cured and carbonized at low-temperature 360 • C with the carbonization cycle of 12 h. The feasibility of the production method was validated through the manufacturing of products with complex shapes-impellers for electric centrifugal pumps. It was found that the carbonized composites have good chemical resistance and low water absorption. The composites have high Shore D hardnesses (93-96), ultimate tensile strengths (62-85 MPa), Young's moduli (17-24 GPa), and compressive strengths (155-181 MPa).

Fabrication and mechanical properties of large‐scale SiC impeller via vacuum gelcasting and pressureless sintering

“…4,5 SiC is considered as one of the most promising candidate materials for impellers served in the abovementioned extreme conditions, due to its excellent properties including corrosion resistance, wear resistance, oxidation resistance, radiation resistance, thermal shock resistance, low thermal expansion, high thermal conductivity, high creep resistance, and strength retention at elevated temperature. 6,7 However, the high hardness and brittleness of SiC ceramics bring great difficulties to its forming and processing. 8 SiC components are typically produced by the pressure-assisted processing methods such as cold-pressed forming followed by pressureless sintering and hot pressing sintering.…”

Effective surface functionalization of fumed silica with NBR telechelic oligomer for high-voltage polyolefin-based dielectric composites

“…The high value of the temperature of the second highest decomposition rate (T2 = 557.4 °C) observed for the o-NBR-grafted silane suggests formation of a carbonaceous residue from o-NBR during the thermal decomposition. The acrylonitrile mers present in the o-NBR macromolecular backbone are considered to be able to trigger carbonization of NBR-based composites [11,12]. Under synthetic air atmosphere the carbonaceous char burns out completely leaving only silica as non-flammable residue (Figure 4).…”

Novel Carbon Fibre Composite Centrifugal Impeller Design, Numerical Analysis, Manufacturing and Experimental Evaluations

“…It was concluded that the fibre glass/epoxy composite present better stress bearing capacity compared to other metallic materials, except titanium alloys. The production method and use of elastomeric matrix composites has been investigated by Chukov et al [ 23 ] that could be used to manufacture products with complex shapes as pump impellers. Two impeller prototypes were designed, manufactured and analysed.…”