Diamond Powder For CVD And Composite Coatings
What This Process Needs To Solve
In a coating, diamond is bought for what it does inside the layer rather than what it removes from a surface. Two routes use our powder: seeding, where a fine diamond suspension is applied to a substrate so that CVD growth starts from a dense nucleation layer, and composite reinforcement, where diamond particles are dispersed in a polymer or electroplated matrix to raise wear resistance.
Seeding wants the finest fraction
Nucleation density sets the final coating’s grain size and adhesion. A dense, evenly spread seed layer of very fine uniform diamond produces a fine-grained, well-adhered film; a patchy or agglomerated seed layer produces a coarse, poorly bonded one. Fine micron powder that disperses cleanly and contains no agglomerates is what the process needs.
Composite coatings want surface activity
Where diamond is dispersed into a polymer or a plating bath to make a wear-resistant composite, the particle’s surface chemistry and dispersion decide the result long before the particle size does. We supply grades with treated surfaces where wetting is the problem, and we can specify the size window against a target coating thickness.
Recommended Grades And Size Ranges
Coating grades are quoted against a target layer thickness and a target nucleation density.
| Use | Recommended grade | Size range | Why this grade |
|---|---|---|---|
| CVD seedingHard-metal and ceramic substrates | |||
| Nucleation seeding | HDYM fine micron, well dispersed | 0.5 – 2 µm | High nucleation density, even seed layer |
| Monolayer seeding | HDY monocrystalline micron | 2 – 6 µm | Uniform coverage on rougher substrates |
| Composite and functional coatingsPolymer, nickel and composite systems | |||
| Wear-resistant polymer coating | HDY monocrystalline micron, treated surface | 1 – 3, 5 – 10 µm | Treated surface wets the resin |
| Nickel–diamond composite | HDY monocrystalline micron | 2 – 10 µm | Co-deposits evenly in the plating bath |
| Thick composite layer | HDY monocrystalline micron | 10 – 40 µm | Builds layer thickness without cracking |
Surface treatment is available where wetting is the limiting factor, and purity is reported on the batch certificate.
What has to hold
- Uniform size with no agglomerates
- High purity and a clean surface
- Good dispersion in the carrier
- Surface treatment for polymer and plating systems
- Consistent behaviour batch to batch
Where it ships
Diamond Grades For This Process
Factory Direct Since 1990
Zhecheng Hongxiang Superhard Material Co., Ltd. is an integrated manufacturer and exporter of synthetic diamond powders since 1990, located in the Diamond Capital of China.
- Own manufacturing base in Zhengzhou, Henan — powder, coating and grading on one site.
- In-house particle size and SEM inspection on every batch before packing.
- Export packing with neutral or custom label, plus sample quantities for process trials.
What To Include
Describe your workpiece, process and target result. We will match the diamond grade from the existing product range.