부산대학교 도서관

The Al.sub.2O.sub.3-Y.sub.2O.sub.3-ZrO.sub.2 eutectic composition samples were prepared using the Al.sub.2O.sub.3, Y.sub.2O.sub.3, ZrO.sub.2 powder treated at 900 °C for 30 min, pressed at 5 ton for 15 s and sintered at 1500 °C for 2 h. The locally made dense plasma focus (DPF) system with energy 2.8 kJ was used to surface modification of these samples. The samples, mounted at distance about 2 cm from the anode, were exposed to three shots of the DPF in Ar gas at a pressure of 0.8 mbar. The phase and elemental analysis of the untreated and plasma treated samples were conducted by the Raman and EDX spectroscopy. The Raman spectroscopy showed the formation of new phases ([alpha]-Al.sub.2O.sub.3 and c-ZrO.sub.2) in the treated samples. The micro-hardness of the plasma treated samples was increased by about 280 % in comparison with the untreated sample.
Author(s): S. Ayash [sup.1], K. Alshoufi [sup.1], M. Soukieh [sup.2], Sh. Al-Hawat [sup.2] Author Affiliations: (1) grid.8192.2, 0000000123533326, Physics Department, Faculty of Science, Damascus University, , Damascus, Syria (2) grid.459405.9, [...]