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Influence of impact pressure on a structure and properties of AL2O3-ZrO2 nanostructured powders in the process of ceramic production |
Tatyana M. Ulyanova 1, Titova Lu 1, Krutko Ni 1, Alexandr F. Ilyuschenko 2, Alexandr A. Shauchonak 2, Sergei G. Barai 2 |
1. Institute of General and Inorganic Chemistry of NAS of Belarus (IGIC), Surganov str., 9, Minsk 220072, Belarus |
Abstract |
For the production of high density ceramic materials in the technician dynamic compaction of powders are used when impulses generated by explosion condense powder blanks. It is possible the proceeding of phase transformations in material, the increase of energetic potential of formed powder milieus owning of defects formation in their structure and organization of interparticle boundaries on atomic level, what increase the durability of parts. Especially use of fibrous nanostructured powders and high-energy method of loading would be very effective. In the present work results of pulse pressing nanostructured oxide powders with application of various schemes of power influence on a material are presented: a method of a running and flat wave, and also research of structure of the preparations pressed by explosion and their physical-mechanical properties after sintering. Partially stabilized zirconia and with alumina addition powders possessed the high specific surface (100-200 m2/g) and consisted of nanograins 10-25 nanometers in the size. The powder samples were treated by explosion impulse loading during which the pressure was up to 5 GPa. The velocity of detonation wave was about 4000 m/s, and time of explosion impulse was some microseconds. X-ray and phase analysis of powders has shown that in the result of influence of energy of running wave, formed during the explosion, the alterations of crystalline structure take place. In samples a crystalline lattice of monoclinic phase of ZrO2 was distorted and its content after explosion was increased, but after annealing the tetragonal phase of zirconia come into particular prominence. The high-energy loading made possible to obtain a finer granular structure, to activate the powder material during the following sintering, to accelerate and to intensify processes, proceeding during a thermal treatment at a lower temperature. Annealed ceramic samples possessed with density 97- 99%, micro hardness 13-14 GPa (on the base ZrO2), and 17-19 GPa (Al2O3), crack resistance higher 5,6-9 MPa ∙m1/2.
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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium I, by Tatyana M. UlyanovaSee On-line Journal of E-MRS Fall Meeting 2009 Submitted: 2009-05-28 14:28 Revised: 2009-08-10 23:03 |