Ali Riaz

CFRP composite manufacturers seek superior surface qualities for use in high-tech sectors. Due to anisotropy and heterogeneity, CFRP is considered a difficult-to-cut material, and diamond abrasives are a preferable choice for machining. Therefore, a better understanding of the impact of diamond abrasive cutting depth on the reinforcing carbon fiber’s breakage pattern paves the way for improved machined surface characteristics. So, the impact of diamond abrasive cutting depth is analyzed on CFRP surface characteristics through cutting forces, surface roughness, and morphology of the abraded constituents of the composite material. Diamond abrasives entangled in ultra-thin dicing blades are utilized to investigate the impact of cutting depth of diamond abrasives for machining unidirectional T700 CFRP composites. Characteristics of the machined surface have been assessed using analysis of variance for cutting depth of diamond abrasives along with varying cutting speeds and feed rates. Findings reveal a higher impact of diamond abrasive cutting depths for process forces and surface roughness than cutting speed and feed rate. Surface morphology analysis revealed the impact of diamond abrasive cutting depth on carbon fiber breakage patterns and matrix deformation. Moreover, the coupling influence of diamond abrasive cutting depth with speed influences the debonding depth of reinforcing fibers which results in the degradation of surface quality.

The study presents a comprehensive analysis of the high-temperature pyrolysis process of CFRP, along with a comparative analysis between single-step and two-step methods during thermal recycling. Before thermal recycling through a customized muffle furnace, optimized pyrolysis process parameters were determined using thermogravimetric analysis (TGA), optical microscopy, scanning electron microscopy (SEM), and EDS to evaluate degradation characteristics and surface morphology of reclaimed carbon fibers (CFs). The results show near 100% recyclability of CFs through a single-step and two-step in 1.25 h and 2 h, respectively, achieving more than 81% tensile strength and 83% modulus. The optimized parameters in the single-step process are heating CFRP waste at 25°C/min till 490°C under an air atmosphere. CFRP is first pyrolyzed under argon and nitrogen atmospheres at 650°C separately, followed by oxidation under air atmosphere until 490°C using a two-step method. Analysis of surface morphology shows a slight improvement in the quality of reclaimed CFs with two-step E1 than that of two-step E2 and single-step E3 . During thermal recycling, the influence of isothermal time on CFRP under air atmosphere is highly significant. The findings emphasize the critical impact of heating ranges, temperature limits, and atmosphere, providing insights into the thermal recycling process to reclaim CFs for remanufacturing advanced composite materials.

Diamond dicing blades are profound cutting tools that find their applications in semiconductor back-end packaging and assembly processes. To fully appreciate the benefits of the dicing blade technique for precision machining, a deeper understanding is required. This paper systematically reviews the contribution of dicing blades in machining, followed by the context of dicing blades: production, characterization, methodology, and optimization. The readers are enlightened about the potential prospects that can be exploited for precision spectra as a result of current research and engineering developments.