Construction of modern tubular heating furnaces There are three types of linings commonly used in modern tubular heating furnaces: brick structure, refractory fiber spray structure and castable structure.How to Update your heat treatment brick structure Brick lining is made of refractory bricks, including standard refractory bricks and special-shaped refractory bricks. The advantage is that different types, properties and grades of refractory bricks and refractory mud can be selected according to the working temperature, working conditions and heat load of different parts of the heating furnace. The disadvantage is that the integrity and sealing of the furnace lining are poor, and the construction efficiency is low.Vacuum heat treatment process of TC11 titanium alloy pipe Refractory fiber sprayed structure Refractory fiber spraying is to send the pretreated bulk fiber cotton out of the spray gun at high pressure through a special fiber spraying machine, and at the same time, through several sets of special fluid conveying equipment, the inorganic binder is evenly sprayed into the fiber cotton through the outer ring of the spray gun. The external mixture is sprayed onto the inner wall of the furnace. The advantages of refractory fiber spraying construction technology are fast construction speed, seamless lining and good air tightness, which is especially suitable for the construction of complex and special-shaped furnace walls.Vacuum heat treatment of high-speed turning tools