Zircon Hot Patch Material/silicon Hot Patch Material, Sealing Material

The use temperature of zircon phosphate refractory plastic can reach 1650~1700℃, and its compressive strength gradually increases with the increase of temperature. The compressive strength of zircon phosphate refractory plastic with the above typical composition is 200~250 kg/cm2 at 1200℃, 350 kg/cm2 at 800'℃, and 500 kg/cm2 at 1350℃. Its thermal expansion coefficient is low, which is 44x10-7/℃ at 100~600℃. The hardening mechanism is that phosphoric acid combines with Al2O3 in clay to form Al(H2PO4), AlPO4, and phosphoric acid combines with ZrO2 in cobalt to form Zr(H2PO4)4, Zr(H2PO4)2, Zr3(PO4)4, ZrP2O7. These compounds combine the zircon aggregates together. It is generally believed that the temperature for generating Al(HPO4)2 is 150℃; the temperature for generating AlPO4 is 236℃; and the process of generating ZrP2O7 at 300-340℃ is reversible, and (ZrO)2P207 is generated at 1520-1550℃, at which time part of the excess P2O5 becomes steam.