The investigation of properties dependence of samples from zirconia stabilized by CaO on a phosphate binder on the P2O5 content and the thermal treatment temperature
The dependence of main properties of samples from zirconia stabilized by CaO, on a phosphate binder from orthophosphoric acid on the P2O5 content (0.8, 1.4, 2.0, 2.6 %) and their thermal treatment temperature (200, 400, 1000, 1200, 1400, 1580, 1750, 2000 ОC) has been investigated. The optimal amount of the phosphate binder (2.0 % in P2O5) was established, providing some increase in the strength of refractories made of zirconia stabilized by CaO, at temperatures of ~ 1750—2000 ОC compared with other quantities of P2O5. Using the petrographic and X-ray phase methods, the dependence of phase composition and structure of samples from zirconia stabilized by CaO, on the phosphate binder on the thermal treatment temperature and P2O5 content was investigated.
As a result of the carried out studies, the production technology of ramming mass from CaO-stabilized zirconia and products from it on the binder made of orthophosphoric acid, designed for service temperatures up to 2350 ОC, has been improved. Products manufactured according to the improved technology will increase their durability in the service and increase the operation duration of high-temperature industrial units.