Structure and Strength of Porous Materials Based on Titanium Carbide Powers of Different Dispersion

Using powder metallurgy methods by sintering in vacuum at temperatures from 1300 to 1500°C, materials with porosity from 67.5 to 82.5% are obtained from mixtures of titanium carbide powders and ammonium bicarbonate as a pore-forming agent. Using X-ray phase analysis, it is established that the crystal lattice parameter of the resulting porous materials decreases with increasing sintering temperature. This indicates a decrease in the content of bound carbon C/Ti in titanium carbide. As a result of a comparative study of the strength characteristics of materials synthesized from nano- and submicron titanium carbide powders obtained from bending tests, it is found that they have similar values. Ultimate bending strength is in the range from 2.6 to 18.1 MPa. As the porosity of the material increases, the tensile strength decreases. The destruction is fragile. In the fracture of materials obtained from titanium carbide nanopowder, destruction is observed both along the body and along the grain boundaries regardless of the sintering temperature. In materials obtained by sintering submicron titanium carbide powder at 1500°C, destruction occurs predominantly along the body of the grains. It is revealed that, under the same sintering conditions, the density of porous material obtained from titanium carbide nanopowder is higher than that of the material obtained from submicron powder.