Hot-pressing sintering process for improving density of ceramic material

Abstract

The invention discloses a hot-pressing sintering process for improving density of a ceramic material and belongs to the technical field of ceramic manufacturing. The hot pressed sintering process comprises the following steps: S1, putting a high-strength graphite pressing block into a graphite sleeve mold, and fixing the position of the pressing block at the bottom of the mold; S2, sequentially laminating the carbon fiber cloth and the ceramic green body which are consistent in section shape and size into a graphite sleeve mold above a lower pressing block according to the sequence of the carbon fiber cloth, the ceramic green body and the carbon fiber cloth, and placing the laminated fabrics above a lower pressing block in thegraphite sleeve mold; S3, under the pressure of 30-60 MPa, heating the mold 2000-2400 DEG C, and carrying out heat preservation and pressure maintaining gor 10-60 min, wherein a high-strength graphite upper pressing head is pressed downwards to pressurize the ceramic material, and finally the ceramic green body is subjected to hot pressing sintering to form the bulletproof ceramic plate. By using the carbon fiber cloth, the smoothness and uniformity of exhausting gas in the ceramic material powder during hot pressing sintering are improved, and the composite armor based on the bulletproof ceramic plate is suitable for manufacturing the bulletproof ceramicplate and can enhance the capability of resisting multiple strikes of armor-piercing bombs and armor-piercing incendiary bombs of the composite armor based on the bulletproof ceramic plate.

Description

technical field [0001] The invention relates to a technology in the field of ceramic manufacturing, in particular to a hot-pressing sintering process for increasing the density of ceramic materials. Background technique [0002] Hot pressing sintering is a commonly used process in the manufacture of ceramic materials. Since the longitudinal pressure is applied to supplement the sintering driving force, the densification of ceramics can be achieved in a short sintering time, and a relatively dense bulk ceramic material can be obtained. Especially for ceramic materials containing covalent bonds that are difficult to sinter, such as B 4 C, SiC, Si 3 N 4 , the advantages of this process are obvious. [0003] For the mold material for hot pressing sintering, whether it is the large outer mold or the upper and lower compacts, high-strength graphite materials with ultra-fine particle structure, high purity and high degree of graphitization are used, which have a dense structure ...

AI Technical Summary

Problems solved by technology

However, in this method, it is difficult to cut and crush high-strength graphite, and the efficiency is low, and the uniformity of powder thickness after high-strength graphite powder is added to the graphite sleeve mold is poor, which easily causes changes in the shape of ceramic parts, and is not suitable for the manufacture of bulletproof ceramic plates.

In addition, this method can only sinter one ceramic piece at a time, and the efficiency is not high

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