Polycrystalline Diamond Plates
Polycrystalline diamond plates are manufactured using the microwave plasma CVD process where diamond is grown continuously from carbon-rich plasma under controlled conditions. Exceptional hardness, durability, and cost-effective large surface areas for thermal heat spreaders and mechanical tools.
Available Standard Wafers & Plates
Browse our standard 2-inch polycrystalline diamond wafers, square plates, and round discs.
2-Inch Unpolished Polycrystalline Diamond Wafer
Large-area CVD polycrystalline diamond wafer grown to 50.8mm (2 inches) diameter for high-density semiconductor packaging, RF power amplifiers, and microwave plasma windows.
Square Polycrystalline Diamond Plates
3x3mm Square
- • CVD Unpolished / Polished
- • Cost-Effective Substrate
- • Laser Cut Geometry
5x5mm Square
- • CVD Unpolished / Polished
- • Thermal Heat Spreader
- • High Abrasion Resistance
8x8mm Square
- • CVD Unpolished / Polished
- • High Mechanical Strength
- • Tool Insert Grade
10x10mm Square
- • CVD Unpolished / Polished
- • Broad Heat Dissipation
- • Wear Component Grade
12x12mm Square
- • CVD Unpolished / Polished
- • Large Surface Substrate
- • RF Power Mount
Round Polycrystalline Diamond Discs
3mm Round Disc
- • CVD Unpolished / Polished
- • Precision Wire Die Blank
5mm Round Disc
- • CVD Unpolished / Polished
- • Miniature Heat Mount
8mm Round Disc
- • CVD Unpolished / Polished
- • Optical Aperture Window
10mm Round Disc
- • CVD Unpolished / Polished
- • Microwave Plasma Window
12mm Round Disc
- • CVD Unpolished / Polished
- • Large Clear Aperture
Advantages of CVD Polycrystalline Diamond
Synthesized by fusing microscopic diamond grains under microwave plasma CVD conditions, polycrystalline diamond plates deliver high mechanical toughness, high isotropic thermal conductivity (800 - 1800 W/mK), and extreme chemical inertness.
Cost-Effective Large Surface Area
Enables large diameter wafers (up to 50.8mm+) at a fraction of single-crystal costs.
Isotropic Heat Spreading
Rapid 360-degree lateral thermal dissipation ideal for high-power multi-chip modules.
Mohs 10 Abrasion Resistance
Extreme wear resistance for CNC cutting tools, wire drawing dies, and waterjet nozzles.
Frequently Asked Questions
Everything you need to know about polycrystalline diamond plates and wafers.
Polycrystalline diamond is synthesized by growing millions of interlocking micro-crystals of diamond in microwave plasma CVD reactors, resulting in a continuous, high-density diamond material with high strength and thermal conductivity.
Key applications include thermal heat spreaders for 5G RF amplifiers, high-power semiconductor packaging, CNC cutting inserts, wire drawing dies, and microwave plasma windows.
Polycrystalline diamond plates can be synthesized in much larger surface area dimensions (up to 2" or 50.8mm wafers) at a significantly lower cost per square millimeter, making them ideal for broad thermal management and mechanical tool inserts.
Nanomine offers 2-inch (50.8mm) unpolished diamond wafers, square plates (3x3mm to 12x12mm), and round discs (3mm to 12mm Φ) with standard thicknesses from 0.2mm to 1.0mm. Custom laser-cut geometries are available on request.
Yes. We provide polycrystalline diamond plates in both raw as-grown unpolished finish (ideal for mechanical bonding) and precision CMP polished finish (Ra < 10nm, ideal for heat sink mounting).
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