Advanced Materials: TechConnect Briefs 2015Advanced Materials TechConnect Briefs 2015

Nanoparticle Synthesis & Applications Chapter 5

Effect of the Consolidation Techniques on the Mechanical Properties of Nanocrystalline Ti55C45 Powders Prepared by Mechanically Induced Self-Propagating Reaction

M. Sherif El-Eskandarany, A. Al-Hazza, L. Al-Hajji, E. Shaban, A. Al-Rowayeh
Kuwait Institute for Scientific Research, KISR, Kuwait

pp. 360 - 363

Keywords: hard materials, ball milling, powder consolidation, nanomaterials, nondestructive testing

A single phase of NaCl-type TiC was obtained after 5 h of ball milling. To decrease the powder and grain sizes, the synthesized material was subjected to further ball milling time. The powders obtained after 200 h of milling possessed spherical-like morphology with average particle and grain sizes of 45 m and 4.2 nm,respectively. The end-products obtained after 200 h of ball milling time, were then consolidated into full dense compacts, using hot pressing and spark plasma sintering at 1500 and 34.5 MPa, with heating rates of 20 oC/min and 500 oC/min, respectively. Whereas hot pressing of the powders led to severe grain growth (~436 nm in diameter), the as-spark plasma sintered powders maintained their nanograined characteristics (~28 nm in diameter). The as-synthesized and as-consolidated powders were characterized, using X-ray diffraction, high-resolution electron microscope, and scanning electron microscope. The mechanical properties of the consolidated samples obtained via the hot pressing and spark plasma sintering techniques were characterized, using Vickers microhardness and non-destructive testing techniques.