Use of high energy ball milling on the sintering optimization of alumina ceramics

• Autor(a) principal: Simoni, Helio R.
• Data de Publicação: 2010
• Outros Autores: Saito, Eduardo, Dos Santos, Claudinei, Santos, Felipe Antunes, Ramos, Alfeu Saraiva [UNESP], Silva, Olivério Moreira M.
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.4028/www.scientific.net/MSF.660-661.701; http://hdl.handle.net/11449/72228
• topic: Al 2O 3; Al 2O 3-Y 2O 3; Characterization; High-energy ball milling; Sintering; Alumina ceramic; Cold uniaxial pressings; Crystalline degree; Green densities; Milled powders; Milling time; Sintered samples; Aluminum; Ceramic materials; Crystallite size; High energy physics; Milling (machining); Milling machines; Powders; Sintered alumina; Spheres; X ray diffraction; X ray powder diffraction; Ball milling

In this work, the effect of the milling time on the densification of the alumina ceramics with or without 5wt.%Y 2O 3, is evaluated, using high-energy ball milling. The milling was performed with different times of 0, 2, 5 or 10 hours. All powders, milled at different times, were characterized by X-Ray Diffraction presenting a reduction of the crystalline degree and crystallite size as function of the milling time increasing. The powders were compacted by cold uniaxial pressing and sintered at 1550°C-60min. Green density of the compacts presented an increasing as function of the milling time and sintered samples presented evolution on the densification as function of the reduction of the crystallite size of the milled powders. © (2010) Trans Tech Publications.