caa a22 4500 388021098 CHVBK 20180307124924.0 cr unu---uuuuu 161130e199801 xx s 000 0 eng 10.1557/JMR.1998.0021 doi S0884291400042588 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0021 Auto ignition synthesis and consolidation of Al2O3-ZrO2 nano/nano composite powders [Elektronische Daten] An "Auto Ignition” technique was utilized in synthesizing Al2O3 -ZrO2 powders with nano/nano microstructure. The process used the corresponding nitrates as oxidizers and urea as the fuel. The as-synthesized powders were characterized by x-ray diffraction and transmission electron microscopy. It was observed that the microstructure consisted of crystallites of Al2O3 and ZrO2, both of which were nanocrystalline. As opposed to the other nanocomposite ceramics, this feature of the microstructure classifies the present powders as nano/nano type. This nanocrystallinity of the microstructure (crystallite size less than 100 nm) was maintained even after a soaking at 1200 °C for 2 h. Since the microstructure is stable at high temperatures, it was possible to densify the powders by hot isostatic pressing at 1200 °C. The product was 99% of the theoretical density and maintained nanocrystalline grain size. The average hardness and toughness values, as determined by an indentation technique, were 4.45 GPa and 8.38 MPa · m1/2, respectively. These values represent evidence of ductility in these composites since transformation toughening was ruled out in this case. The potential application of these results is expected to be in net shape deformation forming of ceramics. Copyright © Materials Research Society 1998 Bhaduri S. Department of Metallurgical Engineering, University of Idaho, Moscow, Idaho 83844-3024 Bhaduri S. B. Department of Metallurgical Engineering, University of Idaho, Moscow, Idaho 83844-3024 Zhou E. Department of Metallurgical Engineering, University of Idaho, Moscow, Idaho 83844-3024 Journal of Materials Research Cambridge University Press 13/1(1998-01), 156-165 0884-2914 13:1<156 1998 13 JMR https://doi.org/10.1557/JMR.1998.0021 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0021 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bhaduri S. Department of Metallurgical Engineering, University of Idaho, Moscow, Idaho 83844-3024 NATIONALLICENCE 700 1- Bhaduri S. B. Department of Metallurgical Engineering, University of Idaho, Moscow, Idaho 83844-3024 NATIONALLICENCE 700 1- Zhou E. Department of Metallurgical Engineering, University of Idaho, Moscow, Idaho 83844-3024 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/1(1998-01), 156-165 0884-2914 13:1<156 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge