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The special properties of the graphite

时时彩5星技巧 www.ugrvh.com   时时彩5星技巧Small make up to tell youThe special properties of the graphite


  1) high temperature resistance


  Graphite melting point is 3850 + 50 ℃, the boiling point is 4250 ℃, even by the ultra high temperature arc ignition, weight loss is small, thermal expansion coefficient is small. Graphite with temperature increase and strengthen the intensity, at 2000 ℃, the intensity of graphite double.



  2) conductive, thermal conductivity


  The conductivity of graphite nonmetalliferous ore is one hundred times higher than normal. Thermal conductivity than steel, iron, lead and other metal materials. Coefficient of thermal conductivity decreases with temperature rise, and even at high temperatures, graphite into insulator. Each carbon atoms in the graphite conductive because of graphite with other carbon atoms only three covalent bond formation, each carbon atom still retains a free electrons to transfer charge.


  3) lubricity


  Lubrication performance depends on the size of the graphite flake graphite, flake, the greater the friction coefficient is smaller, the better the performance of lubrication.


  4) chemical stability


  Graphite has good chemical stability at room temperature, acid, alkali and corrosion resistance to organic solvent.


  5) plasticity


  Graphite good toughness, can run into very thin slice.


  6) thermal shock resistance


  Graphite when used at room temperature can withstand the severe changes of temperature without damage, temperature mutations, graphite volume change is not big, wont produce crack.