Temperature correcting mold for spark plasma sintering

Abstract

The invention discloses a temperature correcting mold for spark plasma sintering. The temperature correcting mold is composed of an outer mold, an inner mold, a lower outer pressure head, an upper outer pressure head, a lower cushion block, an upper cushion block, an upper inner pressure head and a lower inner pressure head; the outer mold is a hollow cavity with openings in the upper end and thelower end, and the inner mold is embedded in the outer mold and is located on a side wall baffle block; the upper inner pressure head, the upper cushion block and the upper outer pressure head are located above the inner mold, and an axial through hole is formed in the middle of the upper cushion block and the middle of the upper outer pressure head and communicates with a middle groove in the upper inner pressure head; the lower inner pressure head, the lower cushion block and the lower outer pressure head are located below the inner mold, and an an axial through hole is formed in the middleof the lower cushion block and the middle of the lower outer pressure head and communicates with a middle groove in the lower inner pressure head; the upper through hole and the lower through hole areused as a light path channel for infrared temperature measurement; and a blind hole is formed in the wall of the outer mold and is used for installing a thermocouple to monitor the temperature in real time. The temperature measurement of the thermocouple is calibrated by adopting infrared temperature measurement, a sintering pattern is ensured to be at the same sintering temperature in the sintering process, the experiment precision is improved, and the operation risk of equipment is reduced.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy sintering equipment, in particular to a temperature calibration mold for spark plasma sintering. Background technique [0002] In the field of material science research, nanocrystalline materials have triggered a research boom at home and abroad because of their excellent properties. However, due to limited preparation technology, it is currently difficult to prepare large nanocrystalline bulk materials. In contrast, the technology of preparing nanocrystalline powder by high-energy ball milling is relatively mature, so the preparation of powder into bulk nanocrystalline materials by powder metallurgy has become a current research hotspot. Nanocrystalline materials are sensitive to temperature, and will spontaneously grow at a certain temperature, thus becoming ultra-fine or even coarse-grained materials, and losing their excellent properties. Therefore, precise control of temperature du...

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Problems solved by technology

Therefore, there is a considerable error in its temperature measurement, which seriously affects the preparation of the pattern, and when the metal with a low melting point is sintered, it will also cause the melting of the sample, which will damage the spark plasma sintering equipment, causing unnecessary losses and increasing the cost of the experiment.

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