Q:Are the black powders in the waste batteries poisonous? And zinc, graphite and so on

CD: cadmium compounds can cause hot metal, there may be severe pulmonary edema, chronic poisoning include pulmonary edema, nephropathy and bone damage, prominent symptoms of muscle, bone and joint pain, can appear albuminuria, such as occurred in 1955~1972 to Sichuan Basin is due to cadmium poisoning caused by Itai Itai disease events in Toyama county the Japanese God.

Q:25%, the fracture of graphite rod, pressing problem or sintering problem?

25% of the filling, 40 feel a little lower, and personally recommend using 50MPa. How long have you been under pressure? Suggest 20-30 minutes. Release the pressure a little slower, it will crack soon. Sintering, the insulation point does not need so much, 340, 320, recommended insulation for 4 hours. Also suggest that you do not put too many blanks in a furnace, it is better to cover in the middle, rough heating and heat dissipation will have an impact.

Q:Carbon fiber nylon bars differ from graphite rods

Carbon fiber and carbon (graphite) difference is that carbon fiber nylon density is light, many products in addition to the requirements of anti shock material is conductive, also there is a demand for density. Such as horse races, saddles, racing bikes, saddles, etc.. Nylon fiber is the best choice.

Q:What kind of sketch do you want, Shi Mobang?

No, it's about two or three yuan for a box and ten for two months. Graphite can be used instead.

Q:How good is the conductivity of graphite and the conductivity of copper?

Copper is a metal with excellent conductivity, second only to silver, and better than graphite in electrical conductivity.

Q:How many times will a high pure graphite stick turn red at temperature?

With the increase of temperature, the oxidation rate is increased, if the nitrogen protection, can reduce the oxidation rate, so some high temperature furnace, vacuum furnace and vacuum extraction is to prevent the oxygen in the air oxidation of graphite, McNair to answer your questions.

Q:What is the difference between a graphite wand, a drawing pencil and an ordinary Chinese painting pencil?

Graphite is an allotrope of elemental carbon is the most soft conductive minerals. Graphite and its products have the properties of high temperature resistance and high strength. Graphite can be used as a pencil core, pigment, polishing agent. After special processing, graphite can be made of various special materials for industrial departments.The main part of the pencil core is graphite. In fact, the pencil is made from a mixture of graphite and clay at a certain proportion. Such as "H" or "hard" English (hard) on behalf of the prefix, content of clay, pencil hardness to said. The bigger the number in front of the H (such as 6h), the harder the pencil core, the greater the proportion of clay in the cartridge to the graphite, the less pronounced the word, and is often used to duplicate.

Q:What is the difference between the conductive effects of different grades of graphite? Refers to the pencil core

Such as "H" or "hard" English (hard) on behalf of the prefix, clay, pencil hardness to said. The bigger the number in front of the H (such as 6h), the harder the pencil core, the greater the proportion of clay in the cartridge to the graphite, the less pronounced the word, and is often used to duplicate.

Q:Copper, graphite rods, dilute sulfuric acid, why not make up the original battery?

Because there is no oxidant, and can not react with dilute sulfuric acid, and if the graphite rod in the vicinity of the continuous access to oxygen, you can form the original battery

Q:What is Teflon graphite stick for?

Should be called graphite modified (reinforced, filled) PTFE bar, rod profiles are used for processing fine size parts. The material is made from polytetrafluoroethylene and reinforced with graphite reinforcing agent (or carbon fiber).