Ultrasonic assistance direct-current sintering furnace and sintering method

Abstract

The invention relates to an ultrasonic assistance direct-current sintering furnace and a sintering method. The ultrasonic assistance direct-current sintering furnace is characterized by comprising a furnace body, an ultrasonic control system, a direct current control system, a one-way pressure control system and a sintering control center; the one-way pressure control system comprises a pressure generation part and a pressure control part connected with each other; the pressure generation part is arranged in the furnace body, and is used for one-way pressing of materials to be sintered in thefurnace body; the pressure control part is connected with the sintering control center, and is used for controlling the pressure of the pressure generation part; the ultrasonic control system is connected with the pressure generation part, and is used for applying mechanical vibration signals through the pressure generation part and acting on the materials to be sintered; and the direct current generator is connected with the pressure generation part of the pressure control system and the sintering control center, and is used for applying direct current on the materials to be sintered. The ultrasonic assistance direct-current sintering furnace and the sintering method can be applied to sintering of various advanced materials.

Description

technical field [0001] The invention relates to a sintering furnace and a sintering method, in particular to an ultrasonic-assisted direct current sintering furnace and a sintering method. Background technique [0002] The densification and sintering of advanced materials such as high-performance ceramics and hard alloys is one of the key scientific and technological issues in the preparation process. Taking advanced structural ceramic materials as an example, sintering can promote the discharge of pores, increase the bonding strength between particles, densify ceramic particles, and finally obtain a dense ceramic material close to the theoretical density and with excellent mechanical properties. [0003] Ceramic materials usually have extremely high theoretical strength, for example, the theoretical strength range of alumina is 38-76GPa; the theoretical strength of silicon carbide is 44-88GPa. However, the actual strength of ceramic materials obtained by existing sintering...

AI Technical Summary

Problems solved by technology

Generally speaking, hot-pressed sintered materials are denser, have smaller grains, and better mechanical properties than normal-pressure and air-pressure sintered materials. However, due to the existence of obvious closed pores inside the material, the level of performance improvement is still not ideal.

Discharge plasma sintering means that there is no external heating source in the sintering process, but a pulse current is directly applied to the material, the material itself is energized and heated to heat up, and the plasma and activation effect generated by the energization are used to promote sintering. This method can shorten the sintering time. However, due to pulse current heating, the temperature field in the sample is often uneven, so large-sized samples cannot be sintered; at the same time, the spark plasma sintering equipment has a complex structure and high cost, which is not suitable for large-scale industrial applications.

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