Graphite is an allotrope of elemental carbon - hexagonal crystals, each of which is joined by a covalent bond with three other carbon atoms (multiple hexagons arranged in a honeycomb). Form a covalent molecule. Since each carbon atom emits an electron, those electrons are free to move, so graphite is an electrical conductor.
Graphite is the softest type of minerals and plays an extremely important role in the metallurgical industry, refractory industry, conductive coatings, sand casting, atomic energy industry, and defense industry.
Flake graphite cryptocrystalline graphite
The true density of graphite is a very important part of the macroscopic physical characterization of such materials. These materials must be tested for their true density and open and closed porosity in manufacturing, transportation and use to determine whether their physical properties meet national environmental standards. Need. The true density value according to current national standards is based on the density bottle (pycnometer method) as the basic method for density measurement of such materials. Although the density bottle method has a lower cost, the test process is cumbersome and difficult to grasp, and the temperature of the immersion liquid is high. If the skill is not proficient, the test result is greatly inaccurate and the repeatability is not good.
Based on the American ASTM standard D2638-91 (2002) designed and manufactured by gas displacement true density analyzer, the inert gas high purity helium gas is used to replace the sample in the sample chamber, which can quickly and accurately test the powder granular sample. Good repeatability, high degree of automation, easy to use, easy to learn and easy to operate. Because it uses inert helium, it does not pollute and damage the sample, and it is easy to recover the sample, which is beneficial to test and analyze the valuable and small amount of sample. Practice has proved that the vacuum exhaust treatment can effectively exclude the adsorbed or attached air in the powder particle material. The gas displacement true density analyzer can effectively perform accurate true density test on the substance, combined with external procedures. It is easier to test the opening and closing rate.
Bethed Instrument Technology (Beijing) Co., Ltd. is one of the earliest professional companies engaged in the research, development, production and sales of nitrogen adsorption specific surface area instruments and true density meters. It is a high-tech enterprise recognized by Beijing Zhongguancun Science and Technology Park.
At present, it has ten technical patents. It is the manufacturer with the most patented technology in the same industry in China. It has strong R&D and innovation capabilities. A number of technical patents are specially used to improve the accuracy and stability of the instrument.
In 2012, it stood out among hundreds of thousands of companies and was selected by the Ministry of Science and Technology as a technology-based SME technology innovation fund support enterprise. It invested in special funds for the research and development and update of instruments, and launched a new generation of instruments to make the company's development new. Stage.
With hundreds of successful users, including many colleges and universities, research institutions and well-known companies, instrument sales have been leading for many years.
In 2009, the company passed the ISO9001 certification and has a complete sales, training and service system. It has an efficient and professional team to provide customers with quality equipment and first-class service.
The professional R&D team has been developed for 1 year, and many industry experts have participated in the international frontier design concept, integrated valve and pipeline design, full modular assembly, high vacuum and high stability, and superior performance compared to imported high-end equipment.
Professional and perfect after-sales service system, can provide 24-hour telephone consultation, 48-hour in-door service, Beijing, Shanghai, Guangzhou have service agencies to fully protect the normal operation of user equipment.
The new generation 3H-2000TD series automatic density analyzer introduced by Bestech can accurately measure the true density of various materials. It has many technical patents and original test methods, which makes its application field wider than similar instruments. The result is more accurate and the analytical material has a wider volume range. The instrument is widely used in many research institutes and enterprises including China Aerospace Science and Technology Fourth Hospital, Shenyang Coal Science Institute, Huahai Group, etc., and has been well received by customers.
dinnerware,tableware,bowl,plate,mug
Shantou Yicheng Trading Co.,Ltd , https://www.shantouyicheng.com