◆ For large furnaces, use meltable molds. The lining needs to be heated up to the specified temperature before pulling out the mold, and a long-time heat preservation is necessary. If the process control is not strict, the lining will be damaged easily;
◆ The penetration of copper is strong, so the density of the lining during installing must be ensured, and the paper or tape for wrapping the mold is easily be broken during the installation process, so avoid the scraps falling into the lining;
◆ The large furnace must use the split mold, and use gas for sintering as much as possible, if use the electric power for sintering, the joint of the mold is easy to have arc discharge, that will damage the mold, and it is not conducive to demolding later;
◆ It is also a key link of the charging and melting process after demolding. The surface strength of the lining after the first stage sintering is not very high. If the charging material is too big, the lining is easily damaged, especially in the upper part when the charges are sinking, the worst result is to reject the lining