Development of Advanced Ceramics by Powder Composite Process

Abstract

Abstract

Pulverization of Y2O3 nanoparticles by using nanocomposite particles prepared by mechanical treatment

“…The powders were mechanically treated using a powder composer (NOB-130, Hosokawa Micron Co.). This process allowed us to produce nanocomposite particles under dry conditions, without any binder, by applying strong shear and compressive stress due to the rotating blade and the small gap between the blade and chamber [15][16][17][18][19][20][21][22][23]. The experimental procedures used are briefly shown in Fig.…”

“…However, the contamination of the nanoparticles with ground ball media after ball milling and bead milling was ten times higher than that caused by a dry process [14]. In our previous study, we used mechanical treatment, i.e., dry process in which strong shear and compressive stresses are applied to powders in order to obtain a uniform dispersion of nanoparticles [15][16][17][18][19][20][21][22][23]. With this result, we http://dx.doi.org/10.1016/j.jascer.2016.06.005 2187-0764 © 2016 The Ceramic Society of Japan and the Korean Ceramic Society.…”

Preparation of Composite Powder and Properties by Surface Modification of Inorganic Pigments for Papermaking

“…When a core particle carrying fines adheres, its surface collides with a noncoated particle, and it transfers part of its fine particles to the latter. By friction and collision between the particles, the agglomerates of fine particles are gradually dispersed onto the surface of the carriers, which results in an increase in the coated surface area (Tatami et al, 2010).…”

Tribological behaviour of Si3N4-based nanocomposites

“…In general, the nanocrystalline ceramics win in hardness and bend strength, when the so-called "size effect" appears, but lose in fracture toughness compared to coarse grained ceramics. Nanocomposites made with non-oxide ceramic compounds exhibit extremely high hardness and wear resistance, low specific gravity, and maintain mechanical properties at high temperatures without oxidation [1][2][3][4][5][6][7][8][9][10]. Unique properties of Si 3 N 4 -based nanocomposites found an application in novel wear-resistive components, capable to withstand severe operating conditions such as cryogenic and high temperatures, boiling sea water, bases, and acids [1][2][3][4][10][11][12][13].…”

“…It was discovered that Si 3 N 4 -based composites enhanced by nanowhiskers or by textured microstructure exhibit up to 30% higher tribological and mechanical properties compared with traditional coarse-grained Si 3 N 4 composites [4,9,14,16,17]. Furthermore, composites enhanced by silicon nitride nanowhiskers after superplastic deformation demonstrated an anisotropy of mechanical and tribological properties [4].…”