Structure and electrophysical properties of hot pressed ceramic materials from the Si3N4-SiC system. III. Influence of electromagnetic and thermal fields on the electrophysical properties

Resistive Properties of the Sintered Ceramic Composite Si3N4 - SiC

“…According to the calculated date, the TRC of specimens 4 and 5 is 1.21 ⋅ 10 −3 K −1 and −1.23 ⋅ 10 −3 K −1 , respectively, while even a slight increase in resistivity is observed for specimen 3 (TRC = 3.72 ⋅ 10 −4 K −1 ). For hot-pressed materials of that composite the nature of the temperature dependence R(T) in the range above the threshold is similar to that obtained in [3].…”

“…Earlier [5] we had found that the use of a polydisperse mixture of FSSi 3 N 4 + PCS-Si 3 N 4 powders in a 1 : 1 ratio also promotes good densification. The plot of the porosity of the sintered 1) experimental results; 2, 3) data of [2] silicon nitride ceramic versus the total activator content in the charge (Fig. 1) allows the composition of the ceramic to be optimized.…”

“…Hence, there is an understandable interest in making such resistive ceramic materials. Our earlier investigations [1][2][3] demonstrated that these composite materials can be obtained by hot pressing, using magnesium, aluminum, yttrium, and zirconium oxides as sintering activators. That method was used to prepare dense (less than 5% porosity) ceramic materials with a controllable level of resistivity (10 0 -10 8 Ω ⋅ cm).…”