Preparation and Properties of MgO-C Refractories Using Sucrose as Binder

Abstract

MgO-C refractories were prepared by using fused magnesia and flake graphite as main raw materials, adding metal aluminium powder as antioxidant, and using sucrose solution instead of phenolic resin as binder. The mechanical properties of MgO-C refractories obtained under different temperature conditions were studied and compared with those of phenolic resin bonded MgO-C refractories. The results show that CO2 and water vapor were mainly released from the solidified sucrose solution during the heating process, which can effectively solve the problem of harmful gases such as formaldehyde and phenol when the phenolic resin is heated. The MgO-C refractory material prepared by the sucrose solution as a binder has a good bonding strength after curing at 180 °C. The flexural strength and compressive strength of MgO-C refractories obtained by adding 6wt% sucrose solution are 4.90 MPa and 41 MPa. At high temperature, sucrose carbonization forms a strong carbon bonding, and the flexural strength of MgO-C refractories is 5.16 MPa and the compressive strength is 34 MPa, which is similar to the performance of the phenolic resin bonded MgO-C refractories.