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In the current research work an attempt is made to utilize the ecofriendly biochar materials as reinforcements in polymer composites. Biochar materials were developed from Arhar stalks and Bael shells waste biomass by pyrolysis process and studied for different characteristics. The surface morphology, crystalline structure, fixed carbon content and elemental composition of synthesized biochar materials were studied using scanning electron microscope, x-ray diffraction and proximate analysis. The results showed that the biochar (BB) produced using Bael shells are highly amorphous in nature and have high amount of elemental carbon than arhar stalk biochar (AB). Using epoxy as matrix and biochar materials as reinforcement composites were fabricated with three different filler weight fractions i.e., 2%, 4% and 6%. The composites with 4% Bael shell biochar exhibited high tensile strength, and has 183% more strength when compared with neat epoxy. Increasing the filler percentage from 4% to 6% the strength and hardness of composites reduced due to poor interfacial bonding. Morphological studies were performed on fractured surfaces of tensile tested samples by using scanning electron microscope. From thermogravimetric analysis it was found that with the inclusion of biochar materials thermal stability of composites was significantly enhanced. 4% Bael biochar composites (BBC) exhibited higher thermal resistance which left 8% residual mass.

In the present work, the mechanical and the tribological properties of eggshell nanoparticulate epoxy biocomposite were studied. The nanoparticles of eggshell were synthesized by planetary ball milling technique. Synthesized eggshell nanoparticulate were characterized with the aid of Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray diffraction analysis, and Fourier Transform Infrared (FTIR) Spectroscopy. Fabrication of eggshell nanoparticulate epoxy biocomposite was done by hand lay-up technique with different weight percentages (1 wt%, 2 wt%, 3 wt%, 4 wt%) of eggshell nanoparticles. To examine the solid particle erosion behavior of eggshell nanoparticulate epoxy biocomposite, four different impact angles (30°, 45°, 60°, 90°) and three different velocities (101 m s−1, 119 m s−1, 148 m s−1) were chosen. The effect of eggshell nanoparticles incorporation on the tensile properties, hardness, and the flexural properties was also investigated. The fractured surfaces of the tensile test, flexural test, and erosion test samples were examined with a SEM for morphological analysis. It was found that the eggshell nanoparticulate addition has a fruitful effect on tensile and flexural strength. The maximum tensile strength was found for 2 wt% nanoparticles addition, while the maximum flexural strength was found for 3 wt% of nanoparticles addition. The sand erosion study established a maximum wear rate at 60° of impact angle. The maximum erosion resistance was found in 2 wt% of eggshell nanoparticulate concentration.

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