Graphite is an allotrope of elemental carbon, and the periphery of each carbon atom is connected with three other carbon atoms (multiple hexagons arranged in a honeycomb pattern) covalently bonded to form covalent molecules. Since each carbon atom emits an electron, those electrons can move freely, so graphite belongs to a conductor. Graphite is one of the softest minerals. Its uses include manufacturing pencil leads and lubricants. Carbon is a non-metallic element located in Group IVA of the second period of the periodic table.
Graphite is soft, black and gray; greasy, can pollute paper. The hardness is 1 ~ 2, and the hardness can increase to 3 ~ 5 with the increase of impurities in the vertical direction. The specific gravity is 1.9 ～ 2.3. The specific surface area ranges from 1-20m2 / g. Under the condition of oxygen isolation, its melting point is above 3000 ℃, which is one of the most temperature-resistant minerals. It can conduct electricity and heat.
There is no pure graphite in nature, which often contains impurities such as SiO2, Al2O3, FeO, CaO, P2O5, CuO and so on. These impurities often appear in the form of quartz, pyrite, carbonate and other minerals. In addition, there are water, asphalt, CO2, H2, CH4, N2 and other gas parts. Therefore, in addition to the fixed carbon content, the analysis of graphite must also determine the content of volatile matter and ash.
High temperature resistance: The melting point of graphite is 3850 ± 50 ℃, and the boiling point is 4250 ℃. Even if it is burned by ultra-high temperature arc, the weight loss is very small, and the coefficient of thermal expansion is also very small. The strength of graphite strengthens with increasing temperature. At 2000 ℃, the strength of graphite doubles. 2) Electrical and thermal conductivity: The electrical conductivity of graphite is one hundred times higher than that of ordinary non-metallic ores. Thermal conductivity exceeds metal materials such as steel, iron, and lead. The thermal conductivity decreases with increasing temperature. Even at extremely high temperatures, graphite becomes an insulator. Graphite can conduct electricity because each carbon atom in graphite only forms 3 covalent bonds with other carbon atoms, and each carbon atom still retains 1 free electron to transfer charge. 3) Lubricity: The lubricating performance of graphite depends on the size of graphite flakes. The larger the flakes, the smaller the friction coefficient and the better the lubricating performance. 4) Chemical stability: Graphite has good chemical stability at room temperature, and is resistant to acid, alkali and organic solvents. 5) Plasticity: Graphite has good toughness and can be rolled into a very thin sheet. 6) Thermal shock resistance: When used at room temperature, graphite can withstand the drastic change of temperature without damage. When the temperature changes suddenly, the volume of graphite does not change much, and no cracks will occur.
The 3H-2000 series automatic nitrogen adsorption specific surface area tester developed and produced by our company is a well-known domestic brand. It entered the market in 2000. After years of continuous R & D and innovation, its performance reached the domestic leading level and the international advanced level, among which many performance indicators Beyond imported instruments, it is a model of domestic high-precision specific surface analyzer. It has 7 patented technologies and is the first domestic manufacturer to obtain multiple national patent protections. It is the earliest domestic instrument used in national key units such as customs and coinage. .
The 3H-2000 series specific surface and pore size analyzers are widely used in the research and development, production, analysis and monitoring of powder materials in graphite, batteries, rare earths, ceramics, alumina, chemical industry and other universities. Our company has been responsible for the specific surface area testing of scientific research units such as the Institute of Physics and Chemistry, the Institute of Chemistry, Beijing University of Aeronautics and Astronautics, Chinese Academy of Sciences for many years and has been trusted and praised. The advanced technology, stable performance and good after-sales service of the instrument make our products enjoy a high reputation and trust among customers. Our company has the largest domestic customer base (see some customers-typical customers), and is exported to Japan, Kazakhstan, Sri Lanka and other countries.
Beside Company has obtained 9 patents related to graphite specific surface area instrument in China, which is a high-tech enterprise qualification of Beijing Science and Technology Park that has obtained the new standard of 2009 with multiple patented technologies in China, and is a production enterprise that has passed ISO9001 international quality system certification; It is the creator and holder of the highest precision of dynamic chromatography specific surface analyzer; it is the representative of the advanced and intelligent of static volumetric adsorption instrument; it can be used for the analysis of specific surface area of ​​battery materials, the specific surface area of ​​catalyst materials, the total surface area and appearance of carbon black Area measurement, etc., widely used in materials research of universities and scientific research institutes and product quality monitoring of powder material production enterprises. The 3H-2000 series automatic nitrogen adsorption specific surface area tester developed and produced by our company is a well-known domestic brand in 2000. Entering the market, after years of continuous R & D and innovation, the performance has reached the domestic leading and international advanced level, and many of its performance indicators have surpassed the imported instruments. It is a model of the domestic high-precision specific surface analyzer. The specific surface area testing tools of scientific research institutes such as the Institute, Beihang University, and Beijing Institute of Technology Made and received trust and praise. The advanced technology, stable performance and good after-sales service of the instrument make our products enjoy a high reputation and trust among customers. Graphite specific surface area instrument is a well-known domestic brand and exported to overseas.
3H-2000BET-A graphite specific surface area instrument performance parameters:
Test method: versatility, can be tested by BET multi-point method, BET single-point method, Langmuir multi-point method, Langmuir single-point method, solid standard sample reference method, etc., statistical layer thickness method (calculation of external specific surface instrument volume) , Particle size estimation, sample BET adsorption constant C and other test methods;
Test accuracy: High test accuracy and good reproducibility. BET multi-point method, BET single-point method, Langmuir multi-point method, Langmuir single-point method, the relative error of the test is less than ± 2%; the relative error of the solid standard reference method test is less than ± 1.5%;
Test range: The test range is wide, and the specific surface area can be measured in the range of more than 0.01m2 / g, which can meet the test of the specific surface area of ​​all powder materials and porous materials; sample types: powder, granules, fibers and tablets Like materials.
Test time: Test time: BET multi-point method, which can test 4 samples at the same time, the test speed averages about 5 minutes per sample for each partial pressure point, and the average total time for each sample is about 30 minutes; BET single-point method can simultaneously Test 4 samples, the average test time is about 5 minutes per sample; the solid standard reference method can test 3 samples at the same time, the average test time of each sample is about 6 minutes, which is only four times of the test time of similar foreign instruments. One part; the above test time does not include the pre-purging time of sample purging and purification.
3H-2000BET-A type graphite specific surface area instrument features brief introduction:
Purge treatment: It has the only domestic integrated degassing device (non-split type), which solves the problem of degassing and testing integration, and realizes the in-situ processing of the sample. It only needs one installation and zero contact with the air, ensuring the sample pretreatment The efficiency and effectiveness of processing;
Wind-heat removal aid: It has the only domestic program-controlled wind-heat removal aid device, which can ensure sharp and rapid desorption peak and reduce background error;
Quantitative tube program-controlled switching: It has the only domestic program-controlled six-way valve calibration system with an action period of less than 10 milliseconds; and quantitative tube volume program-controlled switching;
Detector zero drift suppression: It has the only domestic detector constant temperature system, so that the detector's 10min drift test is less than 0.1mV to ensure the accuracy and stability of the test results;
Concentration chromatography detection: It has the only domestic chromatographic nitrogen partial pressure detection system, and the accuracy of the relative flow method is increased by 10 times, so that the nitrogen concentration control accuracy and detection accuracy can reach one ten thousandth, and high stability;
Particle size model estimation: It has the only domestic data processing function of particle size model estimation, and gives a particle size estimation report; this function can give the average particle size under each model according to the specific surface instrumentation, which plays a guiding role for researchers to judge the particle morphology;
Gas purification cold trap: It has the only gas purification cold trap in China, which improves the purity of gas by more than 1 order of magnitude;
Gas source switch protection: It has the only domestic gas source switch indication and protection device, which automatically cuts off the power after gas cut, permanently avoiding damage to the detector due to the misoperation of the gas cut off and live;
Purge timing: It has the only domestic purge timing function, with timing accuracy of 1 second. After the countdown is completed, the heating power is automatically cut off and a sound prompt is given;
Temperature monitoring: The temperature of the liquid nitrogen can be monitored to eliminate the influence of the temperature difference of ordinary industrial liquid nitrogen, and the use conditions are wide; the room temperature monitoring can eliminate the influence of the ambient temperature.
3H-2000BET-A graphite specific surface area instrument accessories:
Test accessories: 3 bottles of high-purity He, high-purity N2 and helium-nitrogen mixed gas as standard, the gas has a longer service time, and the average use time is more than 2 years Not limited to powder sample testing;
Instrument hardware: The hardware uses stable and durable components, and all key components are imported parts. After strict testing, it is suitable for frequent testing;
3H-2000BET-A graphite specific surface area instrument control system:
Control system: Fully automatic program control of the adsorption and desorption process, and sound prompts of all important links; the operator does not need to worry about delaying the experiment when performing other work or leaving during the operation of the instrument;
Stable test: Large-screen 5-inch LCD liquid crystal display, action instructions of various mechanical parts, make the instrument working status parameters software and hardware display at the same time, even if the software is not open, you can accurately grasp the instrument status, making the instrument more stable;
Test gas path: using low temperature nitrogen adsorption dynamic chromatography, unique parallel gas paths at home and abroad, eliminating external influences such as ambient temperature, humidity, atmospheric pressure, etc., no need to vacuum, the laboratory requirements are relatively loose;
Data processing: The software is a self-developed high-precision data processing system with a high sampling frequency of 100Hz.
Fully automatic control; with complete function of the data processing capability of the surface analyzer; USB communication interface;
The main features of 3H-2000BET-A graphite specific surface area instrument:
Brief list of advantages:
â—† Program-controlled wind and heat removal system;
Function: reduce background noise and increase sensitivity
(Patent name: Graphite specific surface area instrument with blowing heating function Patent number: ZL200920110451.5)
â—† Integrated in-situ heating purge device; and has the timing function of purge program;
Function: Improve pretreatment efficiency
(Patent name: graphite specific surface area instrument with in-situ purge function Patent number: ZL200920110453.4)
â—† Nitrogen partial pressure chromatography detection system, the detection accuracy is more than 10 times higher than the flow method;
Function: Improve the accuracy of partial pressure detection
(Patent name: nitrogen concentration detector Patent number: ZL200920110455.3)
â—† The gas purification cold trap function improves the gas purity by more than 10 times;
Function: reduce the influence of impurities in the gas
(Patent name: gas purification cold trap and graphite specific surface area meter Patent number: ZL200920110450.0)
â—† Constant temperature system of thermal conductivity detector;
Function: Suppress zero drift
(Patent name: gas constant temperature device and graphite specific surface area meter Patent number: ZL200920110454.9)
â—† Program-controlled six-way valve calibration system, quantitative tube volume program-controlled switching function;
Function: The volume of the quantitative tube can be selected according to the needs to improve the calibration accuracy;
â—† Beside sample tube;
Function: large in and small out, convenient for loading
(Patent name: U-shaped sample tube of graphite specific surface area meter Patent number: ZL200920110452.X)
â—† Instrument parameters large screen 5 inch LCD liquid crystal display;
Function: Simultaneous display of software and hardware to improve the reliability of the instrument
â—† Liquid nitrogen temperature monitoring function;
Function: eliminate the temperature difference of industrial liquid nitrogen
â—† Indicator and protection device of detector gas source switch;
Function: prevent the influence of misoperation on the instrument
â—† Granularity model estimation data processing function, and give granularity estimation report;
The earliest model of the 3H-2000 series graphite specific surface area instrument is the HPDAI-88 high-efficiency dynamic adsorption instrument, which is based on the national standard GB / T 10722-2003 (formerly GB / T 10722-1999). The model was in August 1988 Passed the appraisal of the Science and Technology Bureau of the Ministry of Chemical Industry on the 5th. The technical appraisal certificate number was: [88] No. 48 of the Chemical Appraisal. After being improved and upgraded, the 3H-2000 series of instruments passed the measurement test of the National Standard Material Research Center on December 16, 2002. The certificate number is: measurement word No. 2002- (17) -017. In 2004, BET multi-point method teaching 3H-2000II type; 3H-2000III type graphite specific surface area instrument launched in 2005; 3H-2000A type graphite specific surface area instrument launched in 2008 for fully automatic and intelligent operation instrument;
Manufacturers who need to purchase graphite specific surface area instrument, please contact the professional manufacturer of graphite specific surface area instrument--Beside Instrument Technology (Beijing) Co., Ltd. sales staff.
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Suitable for adsorbents (such as activated carbon, silica gel, activated alumina, molecular sieve, activated carbon, calcium silicate, sepiolite, zeolite, etc.);
Ceramic raw materials (such as alumina, zirconia, silicate, aluminum nitride, silica, yttrium oxide, silicon nitride, quartz, silicon carbide, etc.);
Rubber and plastic material reinforcing agent (such as carbon black, white carbon black, nano calcium carbonate, carbon black, white carbon black, etc.);
Battery materials (such as lithium cobalt oxide, lithium manganate, graphite, lithium nickel cobalt oxide, cobalt oxide, lithium iron phosphate, lithium titanate, three elements, three element materials, polymers, polymer materials, polymer battery materials, alkali Manganese material, lithium ion material, lithium manganese material, alkaline material, zinc manganese material, quartz powder, magnesium manganese material, carbon material, zinc air material, zinc mercury material, acetylene black, nickel hydrogen material, nickel cadmium material, separator , Active materials, additives, conductive agents, corrosion inhibitors, manganese powder, electrolytic manganese dioxide, graphite powder, nickel hydroxide, foamed nickel, modified graphite materials, positive active material, negative active material, zinc powder, etc.); Metal oxides (such as zinc oxide, calcium oxide, sodium oxide, magnesium oxide, barium oxide, iron oxide, copper oxide, etc.);
Magnetic powder materials (such as ferric oxide, ferrite, ferrous oxide, etc.);
Nano metal materials (such as nano silver powder, iron powder, copper powder, tungsten powder, nickel powder, aluminum powder, cobalt powder, etc.);
Environmental protection industry (such as pigments and fillers, column fillers, inorganic pigments, calcium carbonate, silica, mineral powder, sediments, suspended solids, etc.);
Inorganic powder materials (such as titanium oxide, titanium dioxide, titanium dioxide, etc.);
Nano materials (such as nano powder materials, nano ceramic materials, etc.);
Rare earth, coal (fly ash), cement (slag powder), energy storage materials, catalysts (diatomite), purifiers, filter aids, soil, clay, petroleum breaking agents, luminescent rare earth powder materials (phosphor powder), Powder materials, powder materials, ultra-fine fibers, porous fabrics, composite materials and other powder and particulate materials, specific surface area and pore size detection and analysis, widely used in universities and research institutes of material research and powder material production enterprise product quality monitoring .
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