Are there any fire resistant and thermally conductive materials, not to mention metal materials, are

Of course, there are, such as silicon carbide and carbonaceous, which have very high thermal conductivity. What are you used for? If necessary, I can give you some suggestions

Graphite. 1) High temperature resistant type: the melting point of graphite is 3850 50, the boiling point is 4250, even if it is burned by ultra-high temperature arc, the weight loss is very small, and the thermal expansion coefficient is also very small.

The strength of graphite increases with temperature, and at 2000, the strength of graphite doubles.

2) Electrical and thermal conductivity: The electrical conductivity of graphite is 100 times higher than that of general non-metallic minerals. Thermal conductivity exceeds that of metallic materials such as steel, iron, and lead.

The thermal conductivity decreases with increasing temperature, and even at extremely high temperatures, graphite becomes an insulator. Graphite is able to conduct electricity because each carbon atom in graphite forms only 3 covalent bonds with other carbon atoms, and each carbon atom still retains 1 free electron to transport the charge.

3) Lubricity: The lubricating performance of graphite depends on the size of the graphite flakes, the larger the flakes, the smaller the coefficient of friction, and the better the lubrication performance.

4) Chemical stability: Graphite has good chemical stability at room temperature, and can resist acid, alkali and organic solvent corrosion.

5) Plasticity: Graphite has good toughness and can be rolled into very thin sheets.

6) Thermal shock resistance: graphite can withstand drastic changes in temperature without damage when used at room temperature, and when the temperature changes abruptly, the volume of graphite changes little and will not cause cracks.

Because metal has electrons in it that can move freelyWhen one end is heated, the frequency of vibration of the electron increases, colliding with the next electron, so that the heat is easily conducted. When a part of the metal is heated, the energy of the free electrons of the heated part (the free electrons of the metal are less bound by atoms) increases, the movement intensifies, and the energy is constantly exchanged by colliding with metal ions, and the heat is transferred from one part to the whole, which is the reason for the good thermal conductivity of the metal.

Effect. When the temperature increases, the electron and lattice thermal movements in the pure metal are intensified at the same time, and as a result, the directional shuttle motion of free electrons, which plays a major role in the thermal conduction process of pure metal, is blocked. Therefore, as the temperature increases, the thermal conductivity of pure metals decreases.

Non-metallic thermal conductivity mainly relies on the vibration of atoms, molecules and crystal lattices, and the thermal conductivity rises as the temperature rises and the vibration intensifies. The heat conduction of gases mainly depends on the thermal movement of molecules, and the thermal conductivity increases as the temperature increases. As can be seen from the above, thermal conductivity is a function of temperature.

Thermal grease is a type of high thermal conductivity that has a high thermal conductivity. It is a common material used in heat dissipation systems to effectively transfer heat from the heat source to the heat sink, thus ensuring the stable operation of the equipment. The thermal conductivity of thermal grease refers to the amount of heat transferred through a unit area per unit of time at a certain temperature.

This is an important parameter to measure the thermal conductivity of thermal grease. The higher the thermal conductivity, the better the thermal conductivity of the thermal grease and the more effective it is in transferring heat to the heat sink. It is calculated as follows:

k = q (a * t) where k is the thermal conductivity, q is the heat transferred, a is the surface area of the radiator, and t is the time. Thermal grease is widely used in various fields, such as electronics, machinery, medical, etc. In the field of electronics, thermal grease is used in computers, servers, 、...

The metals with the worst thermal conductivity are CR (chromium) and MN (manganese).

Thermal conductivity of metallic materials.

The size indicates the size of the thermal conductivity of the metal, and the greater the thermal conductivity, the thermal conductivity.

The value is correspondingly reduced and the thermal conductivity is increased. Most of the heat sinks or heat sinks used in electronic devices on the market are made of aluminum alloy, and only a few heat dissipation materials are made of other materials.

In fact, aluminum is not the metal with the best thermal conductivity, the best is silver, followed by copper, and then aluminum. The silver is expensive and is unlikely to be used as a heat sink. Pure copper is more bulky, but it has advantages in heat dissipation effect, and now it is gradually used in the production of heat sinks in the way of combining aluminum and copper.

The metals in order of thermal conductivity are: silver (Ag), copper (Cu), gold (Au), aluminum (Al), sodium (Na), molybdenum (Mo), tungsten (W), zinc (Zn), nickel (Ni), iron (Fe), platinum (Pt), tin (sn), and lead (PB).

The thermal conductivity of a metal is measured in terms of thermal conductivity. The magnitude of the thermal conductivity indicates the size of the thermal conductivity of the substance, the larger the thermal conductivity, the corresponding decrease in the thermal conductivity, and the enhancement of the thermal conductivity. Among metal materials, silver has the highest thermal conductivity, but the cost is high, followed by pure copper, but it is not easy to process.

The principle of thermal conductivity of metals

The thermal conduction of metal conductors is mainly through the movement of electrons, while the thermal conductivity of insulators mainly depends on the conduction of lattice waves, that is, the movement of phonons, for semiconductors, because the resistance is quite high, the properties are between conductors and insulators, so the thermal conductivity is determined by the above two mechanisms. In general, phonon contributes much more to thermal conductivity than electrons.

The thermal conductivity of a metal crystal is due to the collision of free electrons and metal cations inside the crystal, and the other metal atom loses its outermost electrons and collides with the third (adjective) metal cation silver to become a neutral atom.

If the right end is heated, the neutral atom at the right end loses electrons and carries energy to the left metal cation to the left metal atom, and when heated it loses electrons, it is transferred to the left end, so that the heat is transferred from the right end to the left end.

The metal with the best thermal conductivity is silver.

Thermal conductivity of metal materials: silver has the best thermal conductivity, followed by copper, gold and aluminum.

The metals with the best electrical and thermal conductivity are as follows:

1. Silver. Silver is a type of transition metal. Silver is one of the metals known and used in ancient times, and it is an important one. Silver is found in nature, but most of it is found in silver ore in the form of chemical combinations.

The physical and chemical properties of silver are relatively stable, with good thermal and electrical conductivity, soft quality and ductility. Its reflectivity is extremely high, up to more than 99%. There are many important uses.

2. Copper. Copper is a transition element, pure copper is a soft metal, the surface is reddish-orange with a metallic luster when the surface is just cut, and the element is purple-red. Good ductility, high thermal and electrical conductivity, so in cables and electrical and electronic components are the most commonly used materials, can also be used as building materials, the most important of which are bronze and brass.

Copper is also a durable metal that can be used many times without compromising its mechanical properties.

3. Aluminum. Silvery-white light metal. Malleable. Commodities are often made into sticks, sheets, and foils. In humid air, the pins form a layer of oxide film to prevent metal corrosion.

Soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solutions, insoluble in water. The content of aluminum in the earth's crust is second only to oxygen and silicon, ranking third in Douzhou, and it is the most abundant metal element in the earth's crust. <>

The best is graphene, I don't know what, I would have known that diamonds are the highest, and when I checked it, there was graphene.

Graphene is currently the thinnest yet hardest nanomaterial in the world [3], it is almost completely transparent and absorbs only light" [4] ；The thermal conductivity is as high as 5300 W m·k, which is higher than that of carbon nanotubes and diamond, and its electron mobility * exceeds 15000 cm2 v·s at room temperature, which is higher than that of carbon nanotubes or silicon crystals, and the resistivity is only about 10 -6 ·cm, which is lower than copper or silver, and is the smallest resistivity material in the world.

Thermal conductivity wm -1 k -1

Graphene, Solid (4840 440) -5300 480), Diamond, Solid 900 - 2320

Silver Solid 420

Copper Solid 401

** Solid State 318

Aluminum Solid 237

White Gold Solid 70

Iron solid 60

Steel Solid 60

Lead Solid 35

Mercury in liquid form. Ice Solid 2

Ceramic solid.

Glass solid.

Water in liquid form. Hope it helps you o(o

You can look for honeycomb porous graphite, because it contains honeycomb micropores, the surface area is huge, and the heat dissipation effect has theoretically surpassed that of silver.

Graphene monoatomic layer graphite, although the thermal conductivity effect is good, but it is not convenient to process into a good contact, three-dimensional shape of the radiator, I have seen the heat sink processed with microporous graphite on some foreign countries, but the country has not asked about the relevant information.

Our company is making thermally conductive graphite film, and the horizontal thermal conductivity can reach 1200w m*k, and you can contact 137 28950246