Graphite hot isostatic pressing forming processing method

Abstract

The invention provides a graphite hot isostatic pressing forming processing method which comprises the following steps: filling a sheath with a graphite raw material, and arranging inorganic fiber cotton between the graphite raw material and the inner wall of the sheath; after the filling is finished, sealing the sheath and degassing; and carrying out hot isostatic pressing treatment on the degassed sheath, cooling, and removing the sheath to obtain a graphite product. According to the processing method, the graphite product is produced by adopting a hot isostatic pressing method, uniform stress of a graphite raw material is ensured through degassing and hot isostatic pressing processes, molding processing of powder or improvement of density of a block material is facilitated, an isotropic graphite product can be obtained through processing, improvement of mechanical properties such as graphite strength and the like is facilitated, and the service life of the graphite product is prolonged; and according to the method, the inorganic fiber cotton is arranged between the graphite raw material and the sheath, so that the sheath is prevented from reacting with graphite under hot isostatic pressing high-temperature and high-pressure conditions to influence the product purity, and the problem that the graphite is difficult to separate after reacting with the sheath can also be avoided.

Description

technical field [0001] The invention belongs to the technical field of processing inorganic non-metallic materials, and relates to a processing method for hot isostatic pressing of graphite. Background technique [0002] The molding process is one of the important ways to prepare massive structural parts from powdery particles. There are mainly the following methods, including extrusion molding, compression molding and isostatic pressing. Compared with the first two processing technologies, isostatic pressing is used. The products prepared by the process have more advantages in mechanical properties, and the isostatic pressing process is divided into cold isostatic pressing process and hot isostatic pressing process. The processing time of the latter is often shorter, and the density of the product is usually higher . [0003] Graphite is a commonly used carbon material. The increase in its density is conducive to improving the strength and life of graphite. In the producti...

AI Technical Summary

Problems solved by technology

[0003] Graphite is a commonly used carbon material. The increase in its density is conducive to improving the strength and life of graphite. High-purity graphite needs to be calcined, purified, A series of processes such as grinding and molding, the process is complicated and cumbersome

When graphite is processed, especially for isotropic graphite, it becomes more difficult to increase the density

The use of isostatic pressing to produce isotropic graphite has greater advantages in mechanical properties. Isotropic graphite has stable physical properties, higher graphite density, and better performance. However, the current method is still mainly cold isostatic pressing. , the resulting graphite products have limited properties

[0004] CN 104386670A discloses an isostatically pressed high-purity graphite material and a preparation method thereof, which includes powder preparation, sheet rolling, secondary pulverization, etc. The steps of static pressing, roasting, impregnation, purification, and graphitization. The powder raw materials include coke powder, roasting powder, graphite powder and hard asphalt ingredients. The isostatic pressing step is to put the rubber bag into the mold frame, and put the raw materials into the rubber The leather bag is shaken and loaded many times, sealed, vacuumed, and kept under pressure for a period of time, and then placed in an isostatic cylinder for pressure and pressure keeping. This method is still a cold isostatic pressing process, and the composition of graphite materials is relatively complicated. , there are many steps in the method, the processing time is long, and the density is not enough