CVD Diamond Polycrystalline
CVD diamond polycrystalline, is freestanding pure diamond film, created in a vacuum furnace, by dc arc plasma jet chemical vapor deposition (CVD) method.
At sub-atmospheric pressure, a mixture of carbon-containing gas (methane) and hydrogen is excited and decomposed to form carbon atoms, which are deposited on the substrate and alternately grown into polycrystalline diamond, and the growth keeps a high speed to form a diamond film. This method can also be used for coating tools and workpieces.
Properties of CVD Diamond Polycrystalline
The physical properties of CVD diamond polycrystalline are very close to those of natural diamond in mechanical, thermal and optical aspects. As a result, the CVD diamond films can be laser cut into customized dimensions and be used for making diamond dressing tools, diamond cutting tools, wire drawing dies, heat sink components, and optical windows.
Properties
Natural diamond
CVD diamond polycrystalline
Vicker hardness
＞8000 kg/mm2
＞8000 kg/mm2
Density
3.51 g/cm3
3.51 g/cm3
Thermal conductivity
＞2500 W/m.K
1000 - 2000 W/m.K
Young's modulus
＞1200 GPa
＞1000 GPa
Friction coefficient
0.1
0.1
Chemical stability
Insoluble in any acid and alkali
Insoluble in any acid and alkali
Polycrystalline CVD Diamond Dressing Tool Blanks
Polycrystalline CVD Diamond Dressing Tool Blanks
For mechanical purpose, the polycrystalline CVD diamond blanks are high quality pure diamond of consistent wear resistance and high thermal stability and thermal conductivity, free from any metallic or non-metallic bonding.
The CVD diamond dressing tool blanks are always available in shapes of rectangular logs (sticks), which can be used to make single point dressers, multi-point dressers, blade dressers, roller dressers for dressing applications, such as dressing the aluminum oxide and silicon carbide grinding wheels.
The wear resistance of our CVD dressing tool blanks are from standard grade, high grade to premium grade, in order to meet different hardness of machining targets, and to help tool makers to achieve high cost-performance.
In the chart below are standard sizes of the dressing tool blanks, other dimensions are available by laser cutting according to drawings on request.
Width x Thickness
Length (L)
Code number
0.4 x 0.4 mm
0.4 - 5.0 mm
0404L
0.6 x 0.6 mm
0.6 - 8.0 mm
0606L
0.8 x 0.8 mm
0.8 - 10.0 mm
0808L
1.0 x 1.0 mm
1.0 - 10.0 mm
1010L
1.5 x 1.5 mm
1.5 - 10.0 mm
1515L
2.0 x 2.0 mm
2.0 - 10.0 mm
2020L
Hardness Comparison between CVD Diamond Polycrystalline (CVD-P) and Other Materials
Polycrystalline CVD Diamond Heat Spreader
Diamond has an excellent thermal conductivity among the known materials in nature, coupled with good insulation performance, making CVD diamond an ideal material for electronic heat sink devices, which are used in the production of heat spreaders for laser diode, high-power semiconductor devices, microwave devices and large-scale integrated circuits.
The thermal conductivity of our CVD diamond heat spreaders can reach 1200 to 2000W/m.K, and the wafers are available with polished substrate side and lapped growth side.
In the chart below are the properties and standard sizes of CVD diamond heat spreaders, other dimensions are available on request.
Vicker hardness
8000 - 10000 kg/mm2
Thermal conductivity
1200 - 2000 W/m.K
Young's modulus
1000 - 1100 GPa
Dimensions
as per required
Thickness
300μm ±50μm
Surface finish
substrate side Ra＜30nm, growth side Ra＜100nm
Flatness
＜4μm/cm
Thermal Properties Comparison between CVD Diamond Polycrystalline and Other Materials
For more information, please refer to the above product catalog of CVD Diamond Polycrystalline or feel free to send us an inquiry.