Influences of firing parameters on properties and microstructure of Ni-Cr alloy and porcelain interface

The influence of altering firing temperature and time on the mechanical properties and microstructure of the meatalporcelain interface were studied.The experimental results showed that the reaction in the metal-porcelain interface was very complicated, and the phases of metal-porcelain interface were mainly SnO₂, SnCr_0.14O_x, AlNi₃, KAlSi₂O₆ composite oxides etc.The kinds, quantities and distributions of the interface reaction products were affected by vaviations of firing technological parameters changing, which finally determined bonding strength of metal-porcelain interface.In certain range, the interfical reaction layers widened and the mutant metal-porcelain interface changed into compound type as firing temperature increaseing and firing time prolonging, which played an important role in increasing metal-porcelain interface bonding strength.The bonding strength was 42.7 MPa with firing temperature of 960℃ and firing time of 2.5 min.