Sample heating furnace for testing emissivity of high-temperature material

The invention belongs to the technical field of optical measurement and testing, and discloses a sample heating furnace for testing the emissivity of a high-temperature material, which comprises a furnace body, a graphite pipe horizontally arranged in the furnace body, a graphite heating plate clamped in the center of the graphite pipe, and two symmetrical blackened cavities divided by the graphite pipe, the temperatures of the cavities on two sides are the same, one side is used for measuring the temperature in the furnace body, and the other side is used for measuring the temperature in the furnace body. And the other side is used as a sample heating cavity for heating a sample. The sample is subjected to radiation heating, so that the cavity effect is effectively inhibited while high-precision heating of the sample is met; a sample is heated by adopting a common heating mode of graphite plate heat conduction and graphite pipe cavity heat radiation, the graphite pipe adopts a conical design, the unequal-thi