Influence of technological parameters on the process of SHS-extrusion of composite material MgAl2O4‑TiB2

Abstract

Ceramic rods based on MgAl2O4‑TiB2 material were obtained by SHS-extrusion. The effect of technological parameters (delay time before applying pressure, deformation rate, molding pressure) and design parameters on the process of SHS extrusion of the material, as well as the structure and phase composition of the obtained products, were studied. Ceramic hollow rods based on aluminum-magnesium spinel and titanium diboride up to 100 mm long and with an outer diameter of 5, 6, and 7 mm were obtained. It has been established that the deformation rate has the greatest influence on the process of SHS extrusion of the studied material. It is shown that changing the value of this parameter makes it possible to obtain both compact and hollow rods. The resulting hollow rods had a composite structure: the basis of the rods was octahedral grains characteristic of spinel, 10 – 40 μm in size. Cubic grains of titanium diboride were distributed over the entire volume of the obtained hollow rods and had a size of less than 1 μm. Compact rods consisted of a core, mainly composed of titanium diboride, which is covered with a shell of magnesium aluminum spinel with a thickness of less than 1 mm.