Evaluation of copper-based alloy (C93200) composites reinforced with marble dust developed by stir casting under vacuum environment

Copper-based alloy (C93200) composites reinforced with a different weight percentage of marble dust particles (1.5, 3, 4.5, and 6 wt.%) were developed by stir casting method under vacuum environment. By using this type of reinforcement, it was possible to detect a suitable material for bearing applications. The manufactured material was characterized for its mechanical properties using a micro-hardness tester. A universal INSTRON-5967 machine was used to detect the yield and tensile strength. Further the hardness features were measured using a Walter Uhl model machine, whereby the wear characteristics were simulated under the pin-on-disc tribometer under different working conditions in ambient temperature (23 °C). Next, the preference selection index (PSI) technique that considers multi-criteria decision-making was proposed to validate which material was the best candidate. For the selection of material criteria, some specific material intrinsic properties—such as, density, void fraction, hardness resistance along with tensile, compressive, and flexural strength—were proposed and the surface characteristics linked to friction coefficients along wear properties. It was found that the novel composite material containing 4.5 wt.% of marble dust provided the best combination of properties and is a suitable candidate material for bearing applications

Effect of B4C and waste porcelain ceramic particulate reinforcements on mechanical and tribological characteristics of high strength AA7075 based hybrid composite

In the present research, B4C (constant = 4 wt.%) and X-wt.% of waste Porcelain (P) (X = 0, 4, 8, 12 and 16) particulates, reinforced into AA7075 hybrid aluminium metal-ceramics composites (AMCs) manufactured using the stir casting route were investigated. Microstructures, compositional elements and worn surfaces were analysed to understand their tribological behaviour. The physical as well as mechanical strength of AMCs were also investigated experimentally. The obtained results highlight that the density of hybrid AMCs decreased by increasing the porcelain particulates in the composite matrix (AA7075+B4C). While, mechanical strength such as micro hardness, tensile strength and compressive strength were increased due to presence of the increased ceramic phases. Furthermore, the wear loss and values of coefficient of friction was reduced with porcelain content increments up to a critical value, after which it began to grow. Finally, in order to elucidate the wear mechanism of hybrid AMC, the worn surfaces were examined with FESEM. The obtained results indicated that the hybrid composite AA7075/4B4C containing 12 wt.% Porcelain particulates enabled the best wear properties

Mechanical and tribological properties of composite made of marble dust-reinforced C93200 copper alloy

Composite materials are unique because reveal great physical, mechanical and thermal properties. However, there is yet huge potential to enhance their features by adding specific reinforcement in the matrix in order to reach the requirements of a particular application. This paper presents detailed research on the impact of marble dust reinforcement to mechanical and tribological features of copper based metal alloy (C93200 series) composites dedicated for bearing applications. The novel composites made with marble dust reinforcement (1.5 to 6.0 wt.%) were manufactured using the liquid metal stir casting technique. A micro-hardness tester and universal testing machine (Instron-5967) were used to obtain the mechanical properties. While, the POD tribometer was engaged to detect the wear features by simulating various operating conditions by setting the temperature constant (35°C). The Scanning Electron Microscope (SEM) was used to investigate the wear mechanisms produced at the hard contact between the composites with different marble content against an EN31 hardened steel disc. The data gathered in this research proves an improvement in the mechanical properties, especially for a higher reinforcement ratio of novel composite, in respect to the matrix alloy. Furthermore, the novel marble dust reinforced composites reveal much better wear resistance in respect to un-reinforced composite that make it suitable for bearing application

Influence of silicon carbide and porcelain on tribological performance of Al6061 based hybrid composites

The impact of silicon carbide (5 wt%) and porcelain (1.5–6.0 wt%) reinforcements on mechanical and tribological features of Al-based hybrid composite (manufactured by metal stir casting) is investigated. A pin-on-disc tribometer was used for experiment and SEM for the characterization of wear for different operating conditions. The hardness of the hybrid composites enhanced approximately by 57% with an increment in porcelain particulates from 1.5 to 6 wt%. However, the wear loss and average coefficient of friction decrease when the porcelain content was added and was found to be minimum at 4.5 wt% porcelain. Hence, the presence of 4.5 wt% porcelain in the Al6061/5SiC hybrid composites produces the best wear properties