CGI and ESM series are isostatically pressed graphites which are produced by the method of Cold Isostatic Pressing (CIP). This very fine grain graphite material allows high densities to be achieved.
If you want to learn more, please visit our website Isostatic Press Graphite manufacturer.
Isostatic pressing is a multi-stage process and enables to obtain blocks with extremely homogeneous structure, which have constant physical parameters in each section and point.
Coke is a component produced in oil refineries by heating hard coal (600-°C). This process takes place in a specially designed coke oven, using combustion gases and limited oxygen availability. It has a higher calorific value than conventional fossil coal.
After the raw materials have been checked, they are pulverised to a certain grain size. Special machines, which grind the material, transfer the obtained very fine coal dust into special bags and it is sorted according to the grain size.
This is a by-product of coking (i.e. roasting without air at -°C) of hard coal. Pitch is a dense black liquid.
When the coke milling process is completed, it is combined with pitch. Both raw materials are mixed at high temperatures so that the coal can melt and combine with the coke grains.
After the mixing process, small carbon balls are formed, which must be milled again into very fine grains.
Once the fine grains of the required size are ready, the pressing stage follows. The obtained powder is placed in large moulds, which have sizes corresponding to the final block sizes. The powdered carbon in the moulds is exposed to high pressure (over 150 MPa), which applies equal force and pressure to the grains, so that they are symmetrically arranged and consequently distributed evenly. This method allows to obtain the same parameters of graphite across the whole mold.
The next and at the same time the longest stage (2-3 months) is baking in the furnace. Evenly pressed material is placed in large furnaces where the temperature reaches °C. To avoid any defects or cracks, the temperature in the furnace is constantly controlled. When baking is finished, the block achieves the desired hardness.
At this stage of the process, the block can be impregnated with pitch and burned again to reduce its porosity. Impregnation is usually done using pitch with a lower viscosity than the pitch used as a binder. A low viscosity is required to fill the gaps more precisely.
At this stage, the matrix of carbon atoms is already arranged in an orderly manner, and the process of transition from carbon to graphite is called graphitizing. Graphitizing is the heating of the produced blocks to a temperature of about °C. After graphitizing, the density, electrical conductivity, thermal conductivity and corrosion resistance are significantly improved and the machining efficiency is increased.
Contact us to discuss your requirements of Special Graphite Shaped Part for Sale. Our experienced sales team can help you identify the options that best suit your needs.
After graphitization, it is essential to inspect all graphite properties - including grain size, density, bending and compression strength.
Once the material is completely ready and inspected, it can be manufactured according to customer documentation.
If isostatic graphite is used in semiconductor, silicon monocrystalline and atomic energy industries, it requires high purity, so all impurities must be removed by chemical methods. A typical practice of removing impurities of graphite is to place the graphitized product in a halogen gas and heat it to about °C.
Depending on the application of graphite, its surfaces can be milled and have smooth surfaces.
After final machining, the finished graphite detail is packed and sent to the customer.
We can deliver our isostatic graphite in the forms of:
Our machined isotatic graphite products can also be purified to <5ppm on request.
For further information on available dimensions, isostatic graphite grades and prices, please feel free to contact us. Our engineers will be pleased to advise you on the right material and answer all of your questions.
At Semco, we machine graphite to produce components for many industries and businesses. Graphite is a versatile substance, and our engineers know how to form it to the exact specifications of our clients. While much of the graphite we machine occurs naturally, some of the graphite material that we machine is man-made. A common method of graphite production is extrusion, where graphite blocks are created by pressing carbon powder through a die. While extruding graphite is common, a newer manufacturing process called Cold Isostatic Pressing (CIP) is being employed to meet a growing demand for isostatic graphite. Among graphite industries worldwide, isostatic graphite production is one of the fastest growing, with producers in the US, Europe, and Asia, especially China. The excellent quality of the graphite produced by the CIP method means that this product is sought after by industries all over the world that value its high strength, high density, and isotropic homogeneity. Even with companies in several countries producing this increasingly popular material, market forces have brought about a temporary slow down in production. For many businesses, this means that the material costs have gone up. Semco is proud that say that, with foresight and diligent planning, we have cushioned our customers well from the increase in price of this excellent material.
Some technical background first about isostatic graphite. Whereas graphite is often produced by a ram exerting pressure on carbon powder from one direction as it extrudes the graphite through a die, isostatic pressing exerts pressure on the carbon from every direction. It does this by putting the carbon in a rubber mold and suspending this mold in a chamber filled with fluid. Pressure is added to the chamber and the rubber mold presses the carbon into a graphite block. Isostatic graphite offers properties such as strong thermal stability and low expansion ratio. Thus, when used in extremely high-heat applications, the graphite will not expand considerably, a crucial quality in precision manufacturing. Graphite produced through CIP also has good chemical resistance, good machinability, and excellent electrical conductivity. These qualities make this type of graphite popular in the semiconductor and photovoltaic sectors. The increased demand from these sectors is prompting companies to increase production of these materials. Electronics and photovoltaic industries have experienced a 40% growth year to year from - in the Asia Pacific region, with a matching need for isostatic graphite. Demand in North America is projected to rise moderately, while long-term forecasts predict that the Middle East and Africa are likely to be attractive regions of the isostatic graphite market due to the rise in demand for these materials in the automotive industry in these regions.
All of this is great news for graphite production companies. Several major companies&#;some with a production capacity of over 10kt&#;are based in the US, Japan, France, and Germany. However, the lion&#;s share of production companies are based in China. Even those companies based elsewhere, such as the German company SGL and the French company Mersen, have production bases in China. Famous Chinese isostatic graphite producers include Baofeng Five-star Graphite, Chengdu Carbon (Fangda Carbon New Material), Datong Xincheng New Material, Jilin Carbon and Sinosteel Advanced Material (Zhejiang). Among them, Baofeng Five-star Graphite boasts larger capacity (10kt/a), and Chengdu Carbon has the most product specifications and varieties. The industry growth prospects are so good that several other Chinese firms are ramping up production. However, there has been one hiccup, particularly in Chinese production. Several big firms had to cut production while they worked to bring their manufacturing processes in line with new green initiatives meant to address pollution concerns. In the long run, these green initiatives will mean a better product and less environmental impact. In the short term, they mean decreased output. With rising global demand for these materials and an 8-12 month lag time for other Chinese firms to ramp up production, prices for isotatic graphite have not been stable. Luckily for our customers, Semco plans ahead for these inevitable market fluctuations and stocks nearly 300 tons of graphite to insulate our customers from shortages and higher prices that result from production slowdowns like the one the industry is currently experiencing.
Technological advancements in the global isostatic graphite market, as well as the development of new manufacturing processes of isostatic graphite and its applications, are estimated to propel the isostatic graphite market even further in the near future. All in all, it&#;s not a bad time to be a producer of this synthetic, high quality carbon material. It&#;s also a good time to be a Semco customer. We think about and plan for possibilities like the current isostatic graphite production slowdown so that our customers&#; materials costs remain as near to fixed as possible. Over the next 12-24 months, prices on the world market will likely stabilize. Until then, Semco has you covered.
For more China High-purity graphite block Traderinformation, please contact us. We will provide professional answers.