Diamond Materials Discs & wafers
Polycrystalline CVD Diamond
A practical choice for discs, plates and shaped parts made from many diamond grains.
Good to know
- As-grown and polished surfaces serve different component requirements.
- Grain structure and thickness influence the finished material properties.
- Binder-free CVD material is different from sintered PCD cutting-tool material.
Specifications
What we define for polycrystalline CVD diamond, with units and how each is typically measured. We confirm values for your application in technical review.
Request the datasheetLook up a term in the glossaryDimensions & tolerances
| Parameter | Unit | Typical test method |
|---|---|---|
| Lateral size, outline or diameter, and tolerance | mm | Optical measurement |
| Thickness and tolerance (bulk or layer) | mm | Micrometer or optical gauge |
| Flatness or surface figure, and bow | µm or fringes | Interferometry (633 nm) or profilometry |
| Edge condition and chip limit | Microscopy inspection to drawing | |
| Thickness uniformity (total thickness variation) | µm | Thickness mapping or interferometry |
Crystal & purity
| Parameter | Unit | Typical test method |
|---|---|---|
| Crystal type, grade and grain size | Raman spectroscopy or microscopy | |
| Grain size and texture | µm | EBSD or optical microscopy |
Surface & finish
| Parameter | Unit | Typical test method |
|---|---|---|
| Surface finish condition (as-grown, lapped or polished) | Visual inspection to drawing | |
| Surface roughness per side | nm Ra | Profilometry or AFM |
Material properties
| Parameter | Unit | Typical test method |
|---|---|---|
| Thermal conductivity grade | W/m·K | Laser flash (ASTM E1461) |
| Coefficient of thermal expansion (per temperature range) | ppm/K | Thermomechanical analysis (ASTM E831) |
Electrical & electrochemical
| Parameter | Unit | Typical test method |
|---|---|---|
| Dielectric constant and loss tangent | Resonant-cavity measurement |
Integration & packaging
| Parameter | Unit | Typical test method |
|---|---|---|
| Packaging, cleanliness and labelling | Per drawing | |
| Certificate of conformance and traceability | Supplier declaration |
Where it is used
Requirement to review
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