Hot pressed sintering preparation technology capable of improving density of ceramic material

Abstract

The invention relates to the technical field of hot pressed sintering preparation technologies of ceramic materials, in particular to a hot pressed sintering preparation technology capable of improving density of a ceramic material. The hot pressed sintering preparation technology comprises the following steps: putting presintered ceramic powder into a graphite sleeve mould, mounting a high-strength graphite pushing block at the lower part of the graphite sleeve mould, mounting a high-strength graphite upper pressure head at the upper part of the graphite sleeve mould, respectively placing high-strength graphite powder at contact positions between the presintered ceramic powder and the upper pressure head as well as the pushing block as isolation materials, putting into a hot pressed sintering furnace, and sintering according to a sintering technology. The hot pressed sintering preparation technology provided by the invention has the advantages that operation processing is simple, the high-strength graphite powder is easy to prepare, economical and environment-friendly; sintering density and uniformity of a ceramic cutter material prepared by adopting the hot pressed sintering technology are respectively greatly improved, so that the hardness of the material is also obviously improved; and the hot pressed sintering preparation technology is also applicable to development and preparation of structural parts such as wear-resistant ceramic and high-hardness ceramic and has great application potential in the fields of cutter materials, aerospace and the like.

Description

[0001] 1. Technical field [0002] The invention relates to the technical field of hot-pressing sintering preparation technology for ceramic materials, in particular to a hot-pressing sintering preparation technology for improving the density of ceramic materials. [0003] 2. Background technology [0004] Hot pressing sintering is a commonly used preparation process for ceramic materials. Since the sintering driving force is supplemented by applying longitudinal pressure, the densification of ceramics can be achieved in a short sintering time, and a relatively dense bulk ceramic material can be obtained. Therefore, for ceramic materials containing covalent bonds that are difficult to sinter (such as SiC, Si 3 N 4 、TiB 2 ), hot-pressing sintering is an effective preparation process commonly used at present. [0005] 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...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of non-uniform sintered structure and low density in the traditional ceramic tool material preparation process, resulting in low mechanical properties, especially low hardness, and to provide a hot-pressing sintering preparation process for improving the density of ceramic materials

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