As we all know, the working temperature of an electronic device directly determines its service life and stability. To keep the working temperature of each part of the PC within a reasonable range, in addition to ensuring that the temperature of the PC working environment is within a reasonable range, it is also necessary to Perform heat dissipation treatment. With the enhancement of PC computing power, the problem of power consumption and heat dissipation has increasingly become an unavoidable problem.
The heat sink is a device that dissipates heat for electronic components that are prone to heat in electrical appliances. It is mostly made of aluminum alloy, brass or bronze into plates, sheets, and multiple sheets. For example, the CPU central processing unit in a computer needs to use a considerable Heat sinks; power tubes, line tubes in TV sets, and power amplifier tubes in power amplifiers must use heat sinks.
Generally, the heat sink should be coated with a layer of thermal grease on the contact surface between the electronic component and the heat sink during use, so that the heat emitted by the component can be more effectively conducted to the heat sink, and then dissipated into the surrounding air through the heat sink.
Most of the heat dissipation materials we know are: copper heat sinks, copper-aluminum heat sinks, heat pipe heat sinks, iron heat sinks, etc., but a more effective conduction heat dissipation material has been widely used! It has low thermal resistance, light weight, thermal conductivity

Graphite sheet is a brand-new heat-conducting and heat-dissipating material that conducts heat evenly in two directions, shielding heat sources and components while improving the performance of consumer electronics. With the upgrading of electronic products, the increasing number of mini, high-integration and high-performance electronic devices has resulted in a large number of thermal management requirements. Graphite flakes are further divided into natural graphite flakes and synthetic graphite flakes. Perhaps everyone thinks that both are graphite products and there should be no major difference! It would be a big mistake to think so. Next, we will learn about the basic differences between natural graphite flakes and synthetic graphite flakes from several aspects:
1. Color difference
It can be seen that the color of natural graphite flakes is darker, while the color of artificial graphite flakes is light white.

2. Graphite density
The natural graphite flakes under the microscope are obviously much rougher than the artificial ones. Because artificial graphite flakes have fewer impurities during synthesis and the density is higher than that of natural graphite flakes. The thermal conductivity of synthetic graphite is 700~1500w, while the thermal conductivity of natural graphite is only 300~700w.

The value of natural graphite and the relationship between its purity and particle size. Purity is usually expressed by carbon content or ash content. Generally, the higher the carbon content and the less ash content, the higher the price. Particle size is commonly used in imperial (mesh) or metric (mm) to represent the average particle size of the product. For positive mesh, the larger the particle size, the higher the price; for negative mesh, the smaller the particle size, the more valuable. Therefore, graphite products must be sieved with a standard sieve before packaging. In commodities, it is generally required that the sieve with positive mesh number is higher than 80%, and the under sieve with negative mesh number is higher than 75%.
In some special applications, there are strict requirements on the crystal structure of graphite, the content of trace elements in ash, and the particle size of impurities, such as the content of sulfur, chlorine and iron. Sulfur and chlorine are highly corrosive to contact metals in use, and iron affects the high temperature oxidation resistance of graphite products. Artificial graphite has better circulation than natural graphite, and natural graphite has higher capacity. Due to poor circulation, the choice of electrolyte is more important. Natural graphite is relatively soft, but if the compaction is too high, the particles may be deformed, and the liquid absorption capacity will drop sharply. .

3. Price difference
The price ratio of natural graphite flakes and artificial graphite is 1:4~5.
Artificial graphite flakes: The production of artificial graphite is more complicated and expensive than natural graphite, so the demand for general industry products will not accept its cost.
Natural graphite flakes: The price and effects of natural graphite flakes can be accepted and convinced by industry users, so natural graphite flakes have been widely used in various industries.
At present, natural graphite sheets and synthetic graphite sheets are used in IC, CPU, MOS, LED, heat sink, LCD-TV, notebook computer, communication equipment, wireless switch, DVD, handheld equipment...
Both artificial graphite flakes and natural graphite flakes are materials that conduct heat conduction horizontally. Since artificial graphite flakes require high temperature for sintering, the temporary cost is higher than that of natural graphite flakes. Therefore, natural graphite flakes have more advantages in terms of cost and price, and thermal conductivity. The synthetic graphite sheet is more advantageous.