High-energy ball milling of powder B–C mixtures

✍ Scribed by Alfeu S. Ramos; Simone P. Taguchi; Erika C.T. Ramos; Vera L. Arantes; Sebastião Ribeiro

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 662 KB
• Volume: 422
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.01.096

✦ Synopsis

The present work reports on the preparation of B-10 at.% C and B-18 at.% C powders by high-energy ball milling and further heat treatment. The milling process was carried out in a planetary ball mill. Following the milling process, powder samples were heat-treated at 1200 • C for 4 h using inert atmosphere. The milled and heat-treated B-10C and B-18C powders were characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. A reduction on the intensity of B and C peaks was noticed after milling for 2 h, probably due the fine powder particle sizes because the pronounced fracture mechanism during ball milling of brittle starting components. The XRD patterns of B-10C and B-18C powders milled for 6 h indicated the presence of other peaks, suggesting that a metastable structure could have been formed. After milling for 90 h, these unknown peaks were still present. A large amount of B 4 C was formed after heat treatment at 1200 • C for 4 h beside these unknown peaks.