Polyurethane Cold Isostatic Pressing Bags for Isostatic Graphite
Polyurethane Cold Isostatic Pressing Bags for Isostatic Graphite
Isostatic graphite is a higher level of graphite than high-purity graphite. When it is formed, it is stressed from all sides, so its performance is better. Isostatic graphite is a new product developed in the past 50 years and is closely related to today's high technology.
It not only has great achievements in civilian use, but also plays an important role in national defense. It is a new type of material and is eye-catching. It is an irreplaceable material for manufacturing single crystal furnaces, metal continuous casting graphite crystallizers, graphite electrodes for electric discharge machining, etc. It is also an excellent material for manufacturing rocket nozzles, deceleration materials and reflective materials for graphite reactors.
Isostatic graphite is a new type of carbon graphite material developed in the 1960s. It has the characteristics of high temperature resistance, corrosion resistance, high strength, good electrical and thermal conductivity, self-lubricating, low thermal expansion coefficient and the ability to remain stable under high temperature conditions. With good strength and other properties, it is widely used in high-tech fields such as machinery, chemical industry, electronics, aerospace and nuclear industry.
Characteristics of isostatically pressed graphite:
Isotropic:
There are three main methods for molding carbon graphite products, namely: hot extrusion molding, such as the production of graphite electrodes for steelmaking; molding (including vibration molding) and carbon and electric carbon products used in the aluminum industry; and isostatic pressing.
Although the molding methods are different, the molding principle is the same. The direction perpendicular to the pressure surface has different properties than the direction horizontal to the pressure surface, which is called "anisotropy". This "anisotropy" is beneficial and indispensable for graphite electrodes used in steelmaking and brushes used in motors. They need this characteristic. In many other use cases, "anisotropy" is not required, but "isotropy" is required. So isostatic graphite appeared.
Isostatic pressing changes the material's unidirectional (or bidirectional) pressure to multi-directional pressure, and the carbon particles are always in a disordered state. This results in little or no performance difference in the final product. The performance ratio in the direction is not greater than 1.1. People call it: "isotropic".
In order to manufacture carbon graphite materials with fine structure, dense texture and uniform organization, powder pressing (rather than paste) is the best method. The only methods for powder pressing are molding and isostatic pressing. When molding is used, whether it is single-sided pressing or double-sided pressing, due to the influence of friction (between carbon particles and between the product and the mold), the pressure transmission will gradually decrease, resulting in uneven volume density. This difference increases with the height of the product.
The uneven density of the entire blank not only brings hidden dangers to the subsequent process - roasting, but also causes performance differences in individual products when the blank is processed into finished parts, which is very harmful. When using an isostatic press to form, the product will be stressed evenly in all directions, the volume density will be relatively uniform, and it will not be limited by the height of the product.
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