Spark plasma sintering mold adopting polycrystalline mullite fibers for heat preservation

Abstract

The invention discloses a spark plasma sintering mold adopting polycrystalline mullite fibers for heat preservation, which comprises an inner mold fixedly arranged on outer layers ofpolycrystalline mullite fibers, a plurality of support legs are fixedly arranged on the outer layers of the polycrystalline mullite fibers, a pressing plate is connected to the inner mold in a sliding manner, an annular groove is formed in the side wall of the inner mold, a rotating ring is rotatably connected to the annular groove, a rotating mechanism is installed on the inner mold, the rotating mechanism is matched with the rotating ring, two fixing blocks are fixedly installed on the outer layers of the polycrystalline mullite fibers, connecting rods are installed on the two fixing blocks, and positioning mechanisms are installed between the two connecting rods and the two fixing blocks. The spark plasma sintering mold has the advantages that a certain degree of stirring effect can be applied to metal powder placed in the inner mold, so that the metal powder is more uniformly distributed in the inner mold, the quality of a sintered product is improved, and the mold has relatively low use requirements on auxiliary machinery and is convenient to move.

Description

technical field [0001] The invention relates to the technical field of discharge plasma sintering, in particular to a discharge plasma sintering mold adopting polycrystalline mullite fiber for heat preservation. Background technique [0002] Polycrystalline mullite fiber is a kind of polycrystalline alumina fiber, which can be used as heat insulation material in high-temperature thermal equipment below 1600 °C for a long time, which can significantly improve the thermal efficiency of equipment, greatly save energy, increase productivity, and improve products. Quality, the discharge plasma sintering process is to put metal powder into a mold made of graphite and other materials, use the upper and lower die punches and energized electrodes to apply a specific sintering power supply and pressing pressure to the sintering powder, after discharge activation, thermoplastic deformation It is a new powder metallurgy sintering technology for producing high-performance materials throu...

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Problems solved by technology

[0003] Due to the performance of polycrystalline mullite fiber, it has been widely used in spark plasma sintering process, but the uniformity of powder distribution in the existing mold for spark plasma sintering cannot be guaranteed during use, which is easy to cause There are defects in the formed product, which affects product quality, and the current spark plasma sintering mold needs to be used with multiple mechanical components, resulting in poor mobility

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