The typical flow of the resin impregnation process
In the CVI process, the UHP Graphite Electrode factors affecting the densification effect are the gaseous precursor transport and the chemical reaction kinetics. The matrix carbon is called pyrolytic carbon. More importantly, the strength of this material does not decrease with the increase of temperature, even higher than that at room temperature, which is unmatched by other structural materials. (3) Good anti-ablation performance, uniform ablation, can withstand high temperature above 3000 ℃, used in a short-term ablation environment, such as rocket engine nozzles and throat liners used in the aerospace industry have unparalleled advantages .
The residual carbon rate of asphalt under normal pressure is about 50%. 200h. With the development of the aviation industry, the requirements for the aero-engine thrust-to-weight ratio are getting higher and higher, and the key to improving the new-engine thrust-to-weight ratio is to improve thermal efficiency. Anti-oxidation Anti-oxidation is the key to the use of carbon / carbon composite materials for long-life high-temperature structural materials.
The typical flow of the resin impregnation process is: place the prefabricated reinforcement in an impregnation tank, immerse the preform with resin under vacuum, re-inflate and pressurize the resin to impregnate the entire preform, then put the resin-impregnated preform into the curing tank Carry out pressure curing inside, and then carry on carbonization under the protective atmosphere in the carbonization furnace. The advantage of the CVI densification process is that the matrix has good performance, the degree of densification is convenient for precise control, does not damage the fiber, and can be used with other densification processes. At present, developed countries in the world have fully used this material for space shuttle wings, nose cones, cargo doors, rocket engine nozzles, throat liners, aircraft brake discs and other components.
As a result, a new member has been added to the composite material family. Compared with resin carbon, pitch carbon is easier to graphitize. SiC, TiC, B4C, BN, etc. If the carbon / carbon composite material is used to prepare the hot end parts of the engine and the corresponding design level is improved, the thrust-to-weight ratio of the engine can reach 20. It is estimated that if the oxidative weight loss rate of carbon / char is 1%, the strength will drop by 10%.
The quality and process level of graphite for EDM
'High Temperature Graphite Material', the company's product samples Ben, 2002.1.06. [11] Shanghai Carpeng Roland Chemical Equipment Co. Table 6 Models and performance of graphite used by EDM of Roland Carbon Company of France 3. 2. In the early 1990s, Roland acquired the North American Carbon S.1.
A large isostatic graphite electrode suppliers with a working cylinder inner diameter of φ900 × 2000mm. Table 4 Application Recommendations for Graphite Products for EDM in SGL, Germany 2. It is welded with angle steel for every 250 mm in the height direction to prevent deformation, and the service life is 10-12 times. As a result, it has achieved relatively good results, and the specific performance is as follows: 2.2 The process and equipment are the earliest., Ltd., 'Ten Years' History', 'Comprehensive Corrosion Control', 2008, (4): 4-5 [12] Roland Group, France,
'Specification of Carbon Products for Photovoltaic Products', 2009.09. It claims to have developed isostatic graphite successfully in 1962 and is the world's first production Graphite pressing enterprises have rich production experience., Ltd. In addition, an extra-large isostatic press produced by Sichuan Chuanxi Machinery Factory, Sichuan, China was installed in the newly-built French Roland Graphite (Chongqing) Co.2 The granularity of the material is getting finer and finer. In addition, in order to meet the development of the EDM industry and improve the competitiveness of its own market, SGL has been continuously improving the traditional graphite products for EDM for a long time, while focusing more on the development of new products and new technologies.
Overview of the Development of Special Graphite of the German SGL Group', ' Electric Carbon, 2002, (1): 7-17 [3] SGL Carbon Group, 'Special Graphite-Samples of Materials and Products for Machinery', December 12, 1999 [4] Gu Dinghuai, etc.4 The specification tends to be larger In order to meet the development of technology and the needs of users, the company uses EDM A lot of work has also been done on the upsizing of graphite. As far back as the 1970s, in order to expand its own products and improve the quality and process level of graphite for EDM, the German Linsdorf Carbon Company spent 1.4.3 Wide application range, suitable for rough, fine and high speed playing.
The new material is made by attaching carbon monoxide
'The Spanish aspect of the graphite electrode factory Union's flagship graphene research project (proyecto Flagship) is one of the most active research activities, which promotes the basic research of graphene. It also promoted the industrialization of these research Chen Guo. Its advantage is that it can be easily compared with the current Commonly used electronic components containing silicon are common). The company is one of only a few companies currently producing this material. 'Long battery life' Graphene we sell, especially graphene for testing.
The new material is made by attaching carbon monoxide molecules to the copper surface. Della Fuente said in a telephone interview: 'We produce high-purity graphene with the best performance. Most of it is used for energy storage. A technique called chemical vapor deposition (Chemica l Vapor Deposition, CVD) is a chemical technique used to produce solid materials with high purity and performance. 'She concluded. It has great future in the application and production of new transistors. 'The price varies depending on its size and performance.
Artificial graphene Despite its extraordinary properties, graphene is not perfect.' 'As the market upgrades, the price will Decrease.' Enlighteners of other materials Among all the two-dimensional materials derived from graphene (translator: graphene is a two-dimensional material), Elsa Prada highlighted several of these materials: fluorographene (performance Very similar to Teflon, Teflon, has good lubricity and is completely non-conductive), hexagonal boron nitride (insulating crystal and transparent, high hardness, combined with graphene to optimize its electromechanical properties), molybdenum disulfide (a It is a kind of two-dimensional crystal. In addition,
it has an excellent structure that can be transformed into new required materials for more specific needs. Della Fuente said that they are waiting for the gradual reduction of graphene prices. 'Because the existing graphene does not reach the necessary purity, artificial graphene can be used to study characteristics that are not observed in existing graphene.
The state of the pores of activated carbon depends on the raw
The powdery activated carbon has extremely fast adsorption speed, and has flocculation effect and filtering aid effect. The state of the pores of activated carbon depends on the raw materials used for production, their components, manufacturing methods and conditions. In addition to the main carbon, its composition also contains a small amount of hydrogen, nitrogen, and oxygen, and its structure looks like a hexagon. Appearance is black fine powder, odorless, odorless, and insoluble in general solutions. Characteristics of powdered activated carbon:
The main component of activated carbon is carbon, with a carbon content of High power Graphite Electrode about 90%. Its adsorption is made by physical and chemical suction, and its appearance is black. It is suitable for decolorization, impurity removal, refining and purification of sugar, pharmaceuticals, beverages and organic solvents, and is widely used in water purification and sewage treatment.
The micropores of powdered activated carbon can adsorb low molecular weight gases and small molecules in solution, but the molecules with higher molecular weight cannot enter the micropores; the mesopores provide channels for entering the micropores, and themselves can adsorb higher molecular weight substances; Macropores provide both channel and adsorption. It is also the main material of activated carbon filter felt and activated carbon foam. It is widely used in food, medicine, decolorization, crystallization, filtration, and material purification.
Medical pure water treatment equipment This article only introduces the common sense of pure water equipment in a question-and-answer manner, in order to play a role in attracting bricks and stones, and welcomes the letter to inquire, the company will provide quality services. Generally, various plant debris (sawdust, coconut husk, bagasse, etc. Activated carbon is an invisible air filter.Activated carbon has a high-efficiency air purification function. Medical pure water treatment equipment. Characteristics: Each gram of activated carbon has a specific surface equivalent to 1,000 square meters. There are two kinds of physical and chemical methods.. Activated carbon can create a comfortable and clean environment
The columnar activated carbon made by crushing
Product introduction The columnar activated carbon mainly includes coal columnar activated carbon and wooden columnar activated carbon.
Wooden columnar activated carbon uses high quality sawdust and coconut shell as raw materials. The columnar activated carbon made by crushing, mixing, extrusion, molding, drying, carbonization and activation is more traditional than The coal-like columnar carbon has low ash content, few impurities, and CTC has the absolute advantage. Mainly used for 1. Gas phase adsorption 2. Recovery of organic solvents (benzene-based gas toluene, xylene, recovery of acetone in the acetate fiber industry, recovery of CS2 in viscose staple fiber production, etc.) 3.
Removal of impurities and harmful gases,
This technology reaches the first-class level in China. For ordinary 4mm activated carbon, the adsorption of CTC is only 60%, not more than 70%, and the 4mm wooden columnar activated carbon produced by our company has an adsorption rate of CTC of 100%, which makes up for the lack of domestic CTC adsorption rate. International first-class level! Completely replace imported products. Coal columnar activated carbon is made of high-quality anthracite as raw material and refined by advanced technology. The appearance is black cylindrical particles.
It has reasonable UHP Graphite Electrode structure, good adsorption performance, high mechanical strength, easy to regenerate, and low cost. In the purification of toxic gases, waste gas treatment, industrial and domestic water purification treatment, solvent recovery, etc. Analysis of main technical indicators of coal columnar activated carbon Item test data Analysis item Test data Iodine value> 800mg / g Strength> 92% Specific surface area> 850m2 / g Methylene blue value 120-150mg / g Total pore volume> 0.8cm3 / g Residual chlorine adsorption rate ≥85% Filling density 0.45-0.55g / cm3 粒径 The particle size in the table is 1.0, 1.5, 3.0, 4.0. Other indicators can be adjusted according to user needs.
