Technology of manufacture and properties of electric conductors from corundum microlite operating in corrosive media at high temperatures and pressures

The authors describe electric lead-ins into a region containing a corrosive substance at high temperature and pressure. The bushing insulatiors are made from corundum microlite and platinum-rhodium wire, and are sintered at $1750^{\circ}$ C. The compositions and the manufacturing steps are described in detail. The lead-ins were used to determine the electric conductivity of various substances $(\rm NaCl{,}~\rm KCl{,}~\rm Na_2\rm SiO_3$ and others$)$ in water and in steam at $250$–$500^{\circ}$ C and at pressure $100$–$360$ kg/cm$^2$ without loss of the sealing properties. Several different constructions of the bushing insulator are described.