Isostatic Graphite has its own Characteristics. see bellow details:
- isotropic properties in each direction.
For Carbon graphite products molding methods, there are mainly three types, namely: hot extrusion molding, such as the production of graphite electrodes for steel industry; molded pressing (including vibration pressing) and for carbon and carbon products of aluminum; isostatic molding. The forming method is different, but the forming principle is the same. So there are mainly 3 or 4 kinds of graphite, say: extruded graphite /vibration graphite, molded graphite, isostatic graphite.
- Uniformity of bulk density
For the manufacture of fine-structured, textured, and homogeneous carbon graphite materials, powder pressing (rather than paste) is the only method, while powder compaction is only method of molding and isostatic pressing. When using molded pressing, the pressure transmission will be gradually reduced, resulting in uneven density of the volume. This difference increases, with the increase height in the product, No matter it is a single-sided compression or double-sided pressure. the friction (carbon particles and products and molds) The uneven density of the whole is not only bad for the future processes – roasting hidden dangers, but also result in the finished parts when rough processing, which makes the performance of individual products different, and the difference is very harmful. With isostatic pressing method, the force is uniform for the product in all directions; the bulk density is relatively uniform, and not subject to product height restrictions.
- can produce large-size products.
Due to the rapid development of information industry, the diameter of monocrystalline silicon has been extended from 75-100mm to the large diameter of150- 200mm, and is developing to 250mm-300mm. The diameter of the graphite material needs to increase in accordingly. graphite used in EDM, graphite for continuous casting and graphite for nuclear reactors are also required for large-sized products, for example, graphite products of 1,500 × 2,000mm have been produced on the market today, and mould pressing way cannot be done. Subject to some restrictions
Except ordinary graphite, impregnated graphite, fine particles graphite, high-purity graphite, there is a very special graphite: EDM graphite!
EDM mean Electrical discharge machining, sometimes colloquially also referred to as spark machining, spark eroding, burning,die sinking, wire burning or wire erosion, is a manufacturing process whereby a desired shape is obtained by using electrical discharges (sparks).
EDM graphite is mainly used in the production of molds, it has a metal copper can not match the excellent characteristics. EDM graphite itself has the characteristics of non-metallic material at the same time some of the characteristics of metal. EDM graphite is less than metal copper, the quality of light can bring a lot of benefits to the production; easy processing, speaking from the hardness of the electrical spark graphite is one-third of copper metal; and conductivity is less than copper;
The melting point temperature of EDM graphite is higher than copper. copper melting point is about 1,300 degrees, while the EDM graphite melting point is 3800 degrees. High melting point can be greatly reduced after the electronic pulse generated a large number of high-temperature melting itself, resulting in sublimation phenomenon. In addition, EDM graphite processing is simple, fast production, do not worry about capacity problems!
Due to its unique properties, isostatic graphite is the ideal material of choice for conventional sinker EDM applications. Proper material grade selection is one key component of insuring the efficient use of this modern machining technique. A wide range of materials have been developed over the past decade each designed for specific applications. Materials differ in density, strength, hardness and machinability which can affect metal removal rates, electrode wear, surface finishes and dimensional tolerances.
CFCCARBON LTD can produce large amount of isostatic graphite with stable and reliable quality, Our Products were sold throughout the country and exported to Europe, America, Southeast Asia and other countries and regions which enjoy a high reputation all over the world.
All sizes available, standard bulk density: 1.78g/cm3, 1.85g/cm3. And 1.9g/cm3.