Influence of a high-power pulsed ion beam on the mechanical properties of corundum ceramics

Abstract

Abstract. The mechanical properties of near-surface layers of corundum ceramics treated by high-power pulsed ion beam of carbon are investigated. The samples for investigation were prepared from corundum substrate, which is usually used in microelectronic. The ion treatment was carried out at the TEMP-4M facility under the following conditions: an accelerating voltage of 160-200 keV, the current density in the pulse varied within 15-85 A/cm 2 . It was found that ion irradiation changes the structure and properties of near-surface layers of corundum ceramics. At the same time, melting and erosion of the surface layer takes place. These processes are accompanied by the formation of a network of microcracks. Microcracks are propagated only by the depth of melting layer. The mechanical properties were measured using a NanoTest600 nanohardness testing instrument. It was found that the nanohardness depends of the treatment modes. At a current density of 15A/cm 2 , with an increase treatment dose, the nanohardness of the irradiated surface layer increases in comparison with the initial value before irradiation. At higher current densities, the nanohardness of irradiated ceramics decreases relatively to the initial value before irradiation. The dependences of nanohardness off the irradiation dose in this case have the view of a curves with a minimum at irradiation doses of 2.5•10 14 and 1.3•10 14 cm -2 , for current densities of 50 and 85 A/cm 2 , respectively.

Prospects for Improving Physical and Mechanical Properties of Corundum Ceramics

“…The chemical synthesis method makes it possible to obtain highly dispersed powders of raw materials for the synthesis of corundum ceramics with a given shape and particle size. As a result, it is possible to obtain high-density ceramics with a homogeneous structure and improved strength characteristics [2][3][4].…”

“…Ceramics based on aluminum oxide (Al2O3) and zirconium dioxide (ZrO2) are common structural and functional materials. This is due to a good combination of physical properties, strength, heat resistance, wear resistance, sufficiently high operating temperature and chemical resistance [1][2][3][4][5]. Studies of the prospects for using composite material based on the composition (100-x) Al2O3-(х)ZrO2, which shows an increase in strength and hardness in comparison with mono-corundum and mono-zirconium ceramics, are relevant for its use as a material for metalcutting tools.…”

Modification of Strength Properties of Oxide Materials by Ion Irradiation

“…To date, reliable data of metals and alloys hardening caused by ionic [24][25][26][27][28][29][30] and electronic treatment [31][32][33][34][35][36][37] have been obtained. Data on the processing of ceramics by ion beams are known [38][39][40][41][42].…”

Production of high-flexural-strength corundum ceramics

“…Корундовая керамика широко используется в машиностроении, электронике и радиоэлектронике, в производстве керамических бронепластин [1][2][3][4][5], в металлургии, химической промышленности. Также в настоящее время больший интерес вызывает возможность использования высокочистой корундовой керамики (с содержанием основного вещества 99,99 мас.%) в медицине, в качестве протезов тазобедренных суставов и зубов [2].…”