Hot pressing sintering process to improve the density of ceramic materials

Abstract

A hot pressing sintering process for improving the density of ceramic materials belongs to the technical field of ceramic manufacturing. The hot-pressing sintering process includes the following steps: S1, putting the high-strength graphite lower pressing block into the graphite sleeve mold, and fixing the position of the lower pressing block at the bottom of the mold; S2, placing carbon fiber cloth and ceramic green sheets with the same cross-sectional shape and size The blanks are stacked in the order of assembling carbon fiber cloth, ceramic green body, and carbon fiber cloth in sequence and placed above the lower pressing block in the graphite sleeve mold; S3, under the pressure of 30-60 MPa, heated to 2000-2400 ℃, heat preservation and pressure for 10-60min , during the sintering process, the ceramic material is pressurized by the high-strength graphite upper indenter, and finally the ceramic green body is hot-pressed and sintered into a bulletproof ceramic plate. The invention improves the smoothness and uniformity of gas discharge inside the ceramic material powder during hot pressing sintering through the use of carbon fiber cloth, is suitable for the manufacture of bulletproof ceramic plates, and can enhance the composite armor based on bulletproof ceramic plates to resist armor-piercing bullets and armor-piercing incendiary bullets The ability to hit multiple times.

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 improving the density of ceramic materials. Background technique [0002] Hot-pressing sintering is a common process in the manufacture of ceramic materials. Since longitudinal pressure is used to supplement the sintering driving force, the densification of ceramics can be achieved in a short sintering time, and bulk ceramic materials with better density 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 more obvious. [0003] For the mold material for hot pressing sintering, both the large outer mold and the upper and lower pressing blocks are made of high-strength graphite material with ultra-fine particle structure, high purity and high degree of graphitization, which has a dense structure and high ...

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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