Highly Oriented Pyrolytic Graphite (HOPG) Pyrolytic Graphite Disc

• Customization: Available
• Application: Electronic Devices as Heat Sink
• Carbon Content: High-Carbon
• Model NO.: CZKBRJSM003
• Composition: Carbon
• Crystal Morphology: Layer Crystal Structure
• Forming Way: Chemical Vapor Deposition
• Grade: Industrial Grade
• Type: Non-Standard Products Or Custom Products
• Density: 2.18-2.2g/cm3
• Material: Pyrolytic Graphite
• Size and Shape: Customer Request
• Color: Black Grey
• Advantages: Corrosion Resistance
• Place of Origin: Hebei, China
• Compressive Strength: 83.6 MPa(Ab Direction)
• Ash: 0.02%-0.005%
• Transport Package: Plywood Box
• Specification: customized
• Trademark: KB
• Origin: China
• Production Capacity: 800000 Pieces/Month

Product Description

Pyrolytic Graphite

Pyrolytic graphite is a new carbon material, is produced with high purity hydrocarbon gas in a certain furnace pressure, in 1800 ºC ~ 2000 ºC on the graphite substrate by chemical vapor deposition of the higher crystalline orientation, which has a high density (2.20g / cm), high purity (impurity content (0.0002%) and thermal, electrical, magnetic and mechanical properties of anisotropy, while still maintaining a vacuum of 10mmHg at 1800 ºC.

Generally, carbon deposited above 1800 ºC is called pyrolytic graphite, while carbon deposited below this temperature is called pyrolytic carbon.

Pyrolytic Graphite Structure

Pyrolytic graphite consists of layers of wavy, twisted plans composed of carbon atoms arranged in a hexagonal structure. These layers are mutually parallel to each other but rotated randomly around an axis perpendicular to the deposition plan(c axis). The layered structure, with strong intra-layer covalent bonds and weak electrostatic bonds(Van der Waals bonding) between the layers, leads to a high degree of anisotropy in all properties.

Features of pyrolytic graphite:

High temperature resistance: Pyrolytic graphite can work stably in high temperature environments and has a wide range of operating temperatures. It can be used in vacuum environments or under the protection of inert gases at temperatures up to 3600 ºC.

Corrosion resistance and wear resistance: Pyrolytic graphite has good resistance to acid and alkali corrosion, and excellent wear resistance, allowing it to maintain stable performance in certain harsh environments.

Highly anisotropic: The structure and properties of pyrolytic graphite shows significant differences in different directions. The thermal conductivity along the parallel plane direction is comparable to that of copper, while in the vertical plane direction it is similar to ceramics and belongs to thermal insulation. Meanwhile, its resistivity differs by thousands of times in two directions.

High purity: The purity of pyrolytic graphite is very high, which makes it widely used in some fields that require extremely high material purity.

Excellent electrical and thermal conductivity: Pyrolytic graphite has excellent electrical and thermal conductivity, especially along the parallel plane direction, with outstanding thermal conductivity.

Magnetically, pyrolytic graphite is a great diamagnetic material at room temperature. Magnetic Levitation is a phenomenon that can be implemented using materials with high diamagnetic properties. This material is a suitable option for magnetic levitation due to its high diamagnetic properties.

Applications

• Used in the rocket industry as a strong heating and cooling conductor
• Used in nuclear reactors as a neutron modulator coating
• Used in electronic devices as Heat sink
• Used in the construction of grid structures in some high power vacuum lamps
• Used in the automotive industry to create a certain amount of friction between two parts
• Used in medical engineering industries, for example in the manufacture of artificial hearts, heart valves and artificial vessels due to the lack of rapid blood clot formation

 

Pyrolytic graphite sheets have found applications where heat conductivity and thermal treatment involve. Particularly, there are two main areas where pyrolytic graphite sheets are employed namely thermal transfer and thermal interface. They are efficient and useful in developing tools and equipment that are applied where the temperature controlling process has to be performed in an isolated packaging because of downsizing and that the package has to be lightweight.
 

 

In fact, pyrolytic graphite has turned out to be a practical and ideal solution where the generated heat sources are integrated circuits (IC) such as processor, power amplifiers, CPUs, laptop computers, etc. pyrolytic graphite sheets are widely used in lighting, telecommunications, power conversion and between semiconductors, magnetic components and heat sinks that a lot of heat is generated. They are suitable for products with small sizes like wearable devices, smart phones, 3C electronic supplies and displays. The electronic components where pyrolytic graphite sheets are applied are LED back light, screens, autopilot systems, DDR module, electric vehicles, computer mother board, power supply, wireless hubs and routers.
 

Conclusion

Pyrolytic graphite sheets attract a lot of attention because of their remarkable electrical and thermal conductivity in transmitting the heat generated by many electrical and electronic devices and machines.

Properties of Pyrolytic Graphite
 

Properties	Data
Density(g/cm^3)	2.18-2.2
Compressive strength(MPa)	83.6 (AB direction)
Tensile strength(MPa)	75 (AB direction)
Thermal conductivity(W/m.k)	300-400( AB direction) 3.5-5(C direction)
C.T.E:(10^-6/ºC)	3.2×10^-6/ºC (AB direction) 17-26×10^-6/ºC(C direction)
Specific resistance(Ω.cm)	2×10^-4 Ω.cm(AB direction) 0.6Ω.cm (C direction)
ASH(%)	0.02-0.005

Pyrolytic graphite is divided into two types: highly oriented and ordinary. Highly Oriented Pyrolytic Graphite (HOPG) is a new type of graphite material that has undergone high-temperature treatment and has properties similar to single crystal graphite.

We can produce pyrolytic graphite in both of PG grade and HOPG grade with stable and reliable quality.
 

Technical Data of Graphite Material: 
Isostatic Graphite

Property	KBD-5	KBD-6	KBD-7	KBD-7B	KBD-8	Unit
Apparent Density	1.85	1.90	1.82	1.82	1.90	g/cm^3
Max Grain Size	13-15	8-10	8-10	13-15	8-10	µm
Ash value	≤500	≤500	≤500	≤500	≤500	ppm
Specific Electrical Resistivity	8-10	8-9	11-13	11-13	11-13	μΩm
Flexural Strength	46	55	51	59	60	Mpa
Compressive Strength	85	95	115	121	135	Mpa
Shore Hardness	48	53	65	70	70	HSD
Thermal Expansion (room temperature to 600ºC)	4.75	4.8	5.8	5.8	5.85	10-6/ºC

Molded Graphite 

Property	KBG-4	KBG-5	Unit
Apparent Density	≥1.80	≥1.85	g/cm3
Ash value	≤500	≤500	ppm
Shore Hardness	≥40	≥45	HSD
Specific Electrical Resistivity	≤12	≤12	μΩm
Flexural Strength	38	41	Mpa
Compressive Strength	81	87	Mpa
Max Grain Size	25	25	μm

Vibration Graphite

Property	TSK	GSK	Unit
Apparent Density	≥1.70	≥1.72	g/cm3
Max Grain Size	≤2	≤0.8	mm
Specific Electrical Resistivity	8-10	≤8.5	μΩm
Flexural Strength	≥12.5	≥15	Mpa
Compressive Strength	≥28	≥35	Mpa
Porosity	≤24	≤20	%
Ash value	≤0.3	≤0.3	%

ASH can be purified into 50 ppm, 20 ppm or lower. 


Advanced Production Equipments 

Strict Quality Control Ensures High Quality Products

  

Safe Packing 


Question and Answer:

Q:Are you a manufacturer or trading company?
A:We are a manufacture for graphite material and graphite machined products.

Q:How can you gurantee the quality?
A:We have the most advanced equipments in our lab and professional quality control team.We can gurantee each batch of the product with the stable quality.

Q:Can you offer samples?
A: Yes, we offer samples to test

Q: Delivery time?
A:Around 10 days.

Q: Shipping port
A: Tianjin or main port in China

Q:Payment terms
A:T/T, LC at sight