Vacuum sintering apparatus

A vacuum sintering apparatus, comprising a vacuum cavity body, a power supply assembly, an electrode assembly, a heating body assembly, and a heat-preservation assembly, wherein:

• the vacuum cavity body comprises a vacuum chamber, the vacuum chamber being configured to be connected to a vacuum pump;
• the heat-preservation assembly is provided within the vacuum chamber, the heat-preservation assembly comprises a fixing bracket and a carbon felt layer, the fixing bracket is provided in a square shape or an annular shape, and the carbon felt layer is laid around the fixing bracket;
• the heating body assembly is provided in a zone surrounded by the carbon felt layer, the heating body assembly comprises two groups of unidirectional heating channels, the unidirectional heating channels are in an unenclosed square shape or an unenclosed annular shape, the two groups of unidirectional heating channels are connected in series by a connecting member, and the connecting member is made of a conductive material;
• and
• the electrode assembly is provided at an outer side of the vacuum cavity body and comprises two groups of electrode assembly parts, the two groups of electrode assembly parts extend into the vacuum chamber and are connected to the two groups of unidirectional heating channels;
• and the electrode assembly is electrically connected to the power supply assembly.