The high-temperature vacuum tantalum wire heating furnace comprises an outer shell, a base and a heating device arranged inside the outer shell, and a sealed connection between the outer shell and the base; The heating device is composed of a high temperature heating element, a thermocouple, a thermal insulation sheath and a top baffle plate. The thermocouple is arranged in a central position of the heating device and vertically inserted into the base; The high-temperature heating element is composed of tantalum wire, corundum tube, corundum ring gasket and two tantalum terminal posts, in which corundum tube is evenly distributed around the thermocouple, tantalum wire spirally encircles all corundum tubes, and its two ends are respectively fixed on two tantalum terminal posts, and the adjacent tantalum wire rings are separated by corundum ring gasket, and two tantalum terminal posts are respectively passed through the base. Can be connected to an external power supply when in use; The outer side of the corundum pipe is provided with thermal insulation cover. The furnace has the advantages of simple structure, small size, fast heating speed, low cost, easy maintenance and long cycle life, and can meet the requirements of most heating and insulation experiments.
The heating device is composed of a high temperature heating element, a thermocouple, a thermal insulation sheath and a top baffle, wherein the thermocouple is arranged in the center of the heating device and vertically inserted into the base; The high temperature heating element is composed of tantalum wire, three or more corundum tubes, corundum ring gasket and two tantalum terminal posts, wherein corundum tube is evenly distributed around and parallel to the thermocouple, tantalum wire spirally surrounds all corundum tubes, and its two ends are respectively fixed on two tantalum terminal posts, and the adjacent tantalum wire coils are separated by corundum ring gasket. Two tantalum terminal posts are arranged on the outside of the corundum tube and pass through the base respectively, and can be connected to the external power supply when in use; The thermal insulation sheath is arranged on the outside of the corundum tube to maintain the temperature in the furnace;
The outer shell and the base are double-layer stainless steel hollow structures, between which circulating water can be injected for cooling operation, the outer shell is provided with a vent, and the vacuum system can be connected to the outer shell for vacuum-pumping operation.
The high temperature vacuum tantalum wire heating furnace for the experiment is characterized in that a sample rod is arranged in the middle of two adjacent corundum tubes encircling tantalum wires (a fine corundum tube can be used as a sample rod), and the end of the thermocouple is close to the sample rod.
The high temperature vacuum tantalum wire heating furnace for the experiment is characterized in that the base is provided with a fixed device for fixing the heating device. The tantalum terminal and the fixed device are separated by ceramic insulation gaskets, the outer shell and the base are preferably connected by sealing rubber rings, the thermocouple is made of platinum rhodium alloy, and the insulation envelope is preferably a five-layer niobium cylinder.
