Plasma sintering equipment for MoAlB ceramic blocks

Abstract

The invention provides plasma sintering equipment for MoAlB ceramic blocks. The equipment comprises a vacuum discharge plasma sintering furnace, a cylindrical outer mold arranged in the vacuum discharge plasma sintering furnace, and a cylindrical inner mold arranged in the outer mold; cylindrical upper inner pressing rod and lower inner pressing rod achieving pressure increasing and sealing effects are inserted in the upper and lower ends of the inner mold; cylindrical upper outer pressing rod and lower outer pressing rod achieving the pressure increasing and sealing effects are inserted in the upper and lower ends of the outer mold; the lower end of the upper outer pressing rod butts against the upper end of the upper inner pressing rod; the upper end of the lower outer pressing rod buttsagainst the lower end of the lower inner pressing rod; the upper end of the upper outer pressing rod is driven by an upper pressure motor; the lower end of the lower outer pressing rod is driven by alower pressure motor; an upper electrode and a lower electrode are arranged at the upper end of the upper outer pressing rod and the lower end of the lower outer pressing rod; and the upper electrodeand the lower electrode are electrically connected with a direct-current pulse power supply.

Description

technical field [0001] The application relates to a plasma sintering equipment of MoAlB ceramic blocks. Background technique [0002] In the prior art, MoAlB ceramics are ternary transition metal borides with a nano-layered structure, which are formed by interlacing single-layer or double-layer Al in the transition metal boride Mo-B lattice; because MoAlB Ceramics have this special ternary layered structure, which makes it have good electrical and thermal conductivity, as well as good self-lubrication, wear resistance and easy processing; it has high electrical conductivity at room temperature (2.91×106Ω-1m-1), it also has good thermal conductivity (29.21Wm-1K-1), low thermal expansion coefficient (9.5×10-6K-1); at the same time MoAlB ceramics as a ceramic It has various excellent properties of ceramics, good high temperature stability, high strength and hardness; experimental results show that the MoAlB ceramic is stable when the temperature is as high as 1400 °C in an ine...

AI Technical Summary

Problems solved by technology

In the preparation of our superconducting material MoAlB ceramic block, the pressure effect has a great influence on the material properties, while the sample is prepared with SPS in a conventional mold, the effective pressure acting on the surface of the sample under pressure is only tens of megapascals, which cannot be effectively Increased densification of materials under pressure

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