The invention, belonging to mechanical device used for heating the high temperature fatigue sample, relates the three-stage split type fatigue high temperature furnace. The ring insulating brick is installed on the inner wall to form heating cavity. The up and down furnaces have the holes used for sample head restraint crossing. The furnace filament is divided into upper segment, middle segment, and lower segment which are buried in insulating brick and connected by contact point of contact point and controlled by temperature controller and collected temperature by heat electric couple. Due to adopt three stages to control temperature, the invention possesses the advantages of nicety, convenience, high heating rate, homogeneous heating, improving the service life of furnace filament and reducing experimentation cost. |