Lab Grown 3-4 Carat DEF VS-VVS CVD Diamond Rough Per Pcs Price Cvd Rough Diamond Stone lab grown rough diamond hpht cvd uncut stone

Introduction to CVD Diamond Blanks

CVD diamond , or diamond blanks synthesized via Chemical Vapor Deposition (CVD), are a significant form of artificially synthesized diamond. The following provides a detailed introduction to CVD diamond blanks.

Production Method

CVD diamond blanks are produced under high-temperature and low-pressure conditions (typically around 1000°C and below 27 kPa). In this process, a carbon-containing gas mixture (such as CH4/H2, CH4/N2, CH4/Ar, etc.) is activated, causing carbon atoms to detach from the carbon source gas and deposit on a suitable substrate (e.g., Si, c-BN, SiC, Ni, Co, Pt, Ir, Pd, etc.) in an oversaturated manner, forming high-purity, high-performance diamond films or blanks. Among the CVD techniques, Microwave Plasma Chemical Vapor Deposition (MPCVD) is the mainstream method due to its minimal pollution, large production area, and easily controlled temperature conditions.

Performance Characteristics

1. Extremely High Thermal Conductivity: CVD diamond boasts an extremely high thermal conductivity, five times that of copper, making it one of the highest thermally conductive materials in nature. This characteristic enables CVD diamond to have widespread applications in thermal management materials (e.g., heat sinks,

2. packaging materials, substrates).

3. Excellent Mechanical Properties: CVD diamond possesses exceptional hardness and wear resistance, being the hardest material in nature. This advantage allows it to play a unique role in ultra-precision machining (e.g., precision cutting tools, wire drawing dies).

4. Good Chemical Stability: CVD diamond exhibits high chemical inertness, remaining stable in various harsh environments, thus being widely used in biosensors and other fields.

5. Broad Spectral Transmittance: Diamond has high spectral transmittance across a wide wavelength range from ultraviolet to far-infrared, coupled with its excellent mechanical and thermal properties, making diamond films an ideal optical window material for use in harsh environments.

Application Fields

1. Thermal Management Materials: CVD diamond is considered an ideal thermal management material for the rapidly evolving electronics industry, widely applied in heat sinks for high-power optoelectronic components.

2. Ultra-Precision Machining: The internal homogeneity of CVD diamond allows for extremely flat and sharp edges, making it suitable for ultra-precision mirror surfaces such as reflectors for nuclear reactors and precision optical instruments, as well as computer hard drives.

3. Wire Drawing Dies: CVD diamond wire drawing dies overcome the anisotropy of natural diamond dies, offering superior strength and hardness, ideal for the drawing of small-diameter wire materials.

4. Optical Window Materials: Diamond films, with their high spectral transmittance and excellent mechanical and thermal properties, are an ideal choice for optical window materials used in harsh environments.

5. Quantum Technologies: Diamond's ultra-wide bandgap and the non-absorption of deep-level defect luminescence within the bandgap make it a potential material for quantum information processing, communication, and computing.

CVD single crystal diamond properties:

Since CVD diamond does not contain any metal catalysts, its thermal stability is close to that of natural diamond. Like high temperature and high pressure artificially synthesized polycrystalline diamond, CVD diamond grains are also arranged in disorder, without brittle cleavage planes, so they are isotropic.

nitrogen content：<50ppm

Hardness (microhardness)：80～150GPa

Young's modulus：1150～130OGPa

coefficient of friction：0.05~0.05

Thermal expansion coefficient：10-.K-l

Thermal conductivity：1500-2000 w/ (m·K)

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