Effect of milling parameters on exfoliation-assisted dispersion of short carbon fibers in silicon carbide powder

Autor: Thakur Sudesh Kumar Raunija
Rok vydání: 2016
Předmět:
Zdroj: Advanced Powder Technology. 27:145-153
ISSN: 0921-8831
DOI: 10.1016/j.apt.2015.11.015
Popis: A novel methodology for the dispersion of carbon fibers (CFs) in silicon carbide (SiC) powder without any dispersing agent was explored. Short CFs were chopped and exfoliated. The exfoliated fibers were dispersed in SiC powder through wet ball milling, drying and crushing. The influence of various ball milling parameters like milling time (MT), ball to powder ratio (BPR), slurry media to powder ratio (SMPR), etc., on the dispersion and distribution, and average particle size (APS) of composite powder was studied. Two MTs (4 and 8 h), two BPRs (4 and 8), and four SMPRs (6, 10, 20 and 35 mL/cm 3 ) were used. The dispersion and distribution was checked through environmental scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM). The results showed that the increase in MT and BPR improved the distribution along with dispersion but, surprisingly, infuse fiber filaments. The APS of powder mixture was found to decrease with MT and BPR. The results further showed that the dispersion and distribution was improved with decrease in SMPR. The severe ball formation was noticed at a SMPR of 35 mL/cm 3 . Further, the APS was found highly dependent on SMPR.
Databáze: OpenAIRE