Creation of electrically conductive composite ceramics based on facing tiles with the addition of SiC

Abstract

In the article, the creation of electrically conductive composite ceramics based on facing tiles with the addition of SiC with specified electrodynamics’ characteristics was considered.
 To obtain a press powder, the raw materials in a predetermined amount were weighed, 10, 20 and 30 % silicon carbide were added and subjected to wet grinding in a ball mill. The resulting slip was dried in a drying oven and passed through a № 05 sieve. The finished press powder for facing ceramics with SiC, moistened to 8 %, was weighed and poured into a mold for pressing, the pressure force was 18—20 MPa. The resulting green was dried in a drying oven. The semi-finished product was burned in a sillite furnace at a firing temperature of 1120—1140 °C with a holding at a maximum temperature of 5—10 minutes. The chemical composition of obtained press powder and the technological scheme for obtaining samples were presented.
 The obtained data shown that the best sample was facing ceramics with 30 % SiC, which had the following properties: water absorption — 5.9 %, open porosity — 12.5 %, apparent density — 2.13 g/cm2, resistivity — 0.43 ⋅10-6 Ohm ⋅m. The obtained X-ray diffraction pattern indicated the presence of silicon carbide in the sample after firing, which was confirmed by the data on the study of specific volumetric resistance of the studied ceramics and the obtained practical results.

Analysis of the structure of electrically conductive composite ceramics

“…1, d) has the lowest open porosity. This is also confirmed by a previous study [16], which indicated its characteristics: open porosity -12.51 %, water absorption -5.88 %, apparent density -2.13 g/cm 2 , resistivity -0.43•10 6 Ω•m.…”

“…The obtained raw material was dried in a drying cabinet. The finished semi-finished product was fired in a silite furnace at a firing temperature of 1120-1140 °C, with exposure at the maximum temperature for 5-10 min [16]. The mass composition of raw materials for the production of electrically conductive composite ceramics from SiC is presented in the Table 1.…”