CVD synthetic diamond is an acronym for chemical vapor deposition diamond, pure diamond polycrystalline structure, no cutting surface, no metal binder. More SuperHard offers a full range of CVD diamond grinding, cutting, dressing, coating, thermal and wear part solution and service
Applications of CVD diamond
CVD diamond plate is used for semi-finishing, finishing, super finishing and continuous cutting of ultra precision cutting tools. In addition, the CVD diamond is also used for other high-tech applications (such as diamond dresser, wire drawing die, electronics, optical window, heat spreader and gem stone industry, etc).
The specification of CVD diamond plates
| Model | length * width * thickness (mm) |
| CVD diamond plate | 1 * 1 * 1 |
| 2 * 2 * 1 | |
| 3 * 3 * 1 | |
| 4 * 4 * 1 | |
| 5 * 5 * 1 | |
| 6 * 6 * 1 | |
| 7 * 7 * 1 | |
| 8 * 8 * 1 | |
| 9 * 9 * 1 | |
| 10 * 10 * 1 | |
| 11* 11 * 1 | |
| 12 * 12 * 1 | |
| Thickness of CVD diamond plate from 0.3mm to 3mm
Other sizes of cvd diamond plates can be made according to customer’s requirement |
|
Single Crystal orientation
2pt(110): top and bottom 110+2 sides 110+2 sides 100
4pt(100): top and bottom 100+4 sides 110
How many types of cvd diamond plates
1. CVD diamond plates for cutting tools
Benefits of cvd diamond plates for cutting tools
– Because the concentration of atomic hydrogen produced by arc discharge is relatively high, the CVD tool blank processed by the DC arc plasma jet also has a higher thermal conductivity than the tool blank processed by other methods even at higher grown rate. This shows that CVD is obviously beneficial to heavy high-speed cutting operations.
– The CVD diamond tool is made with CVD diamond blanks without any binder, sharing the same surface smooth finish as the natural single crystal diamond.
– The working life of CVD diamond cutting tools are 100 times higher than that of hard alloy.
Applications of cvd plates: non ferrous materials, ceramic, abrasive composites, high silicon – content aluminum alloy, graphite and other difficult machining materials.
2. CVD diamond for optical windows
The high-quality CVD diamond has excellent optical performance, it has high optical transparency in х -RAY, UV, visible lightinfrared light, even up to the millimeter-wave.
Excellent transparency in the optical, high thermal conductivity, extraordinary high hardness and high fracture toughness, and very low thermal expansion coefficient make cvd diamond an ideal material for highly demanding optical window the broad band optical transparency
Applications of cvd diamond plates: for optical windows. Such as high power laser windows, high power micromave windows and durable windows, etc
The properties of optical grade CVD diamond
| Transmission | 225nm To Far Ir 70% @10μm |
| Refractive Index | 2.38 @ 10μm, 2.41@500 Nm |
| Absorption Coefficien | <=0.10 Cm^-1 @10 Μm |
| Bandgap | 5.45ev |
| Double Side Surface Roughness | Ra 10nm |
| Flatness | 4um/Cm |
| Thickness <= 0.3mm Diameter<= 20mm |
3. CVD diamond blanks for dressing tool
Chemical vapor deposition(CVD) for dressing tools is made by laser cutting CVD diamond thin-film. CVD diamond blanks are suitable for various dresser tools,
– Single – point cvd dresser
– Multi – point cvd dresser,
– CVD rotary dresser,
– CVD diamond dressing roller
CVD diamond blanks produced by the high quality semitransparent polycrystalline diamond, with no binder phase, have excellent thermal stability and high thermal conductivity.
The cvd diamond grade includes (standard grade and high quality grade)
| Performance | Standard | High Quality |
| Vicker Hardness | 8000 Kg/Mm^2 | 10000 Kg/Mm^2 |
| Density | 3.51g/Cm^3 | 3.51g/Cm^3 |
| Young’s Modulus | 1000 Gpa | 1100 Gpa |
| Thermal Conductivity | 1000w/M.K | 1500w/M.K |
| Chemical Stability | Insoluble In All Of Acid And Alkali | |
| Break Strength | 350 Mpa | 550 Mpa |
| Wear Ratio | 200000 | 400000 |
| Thermal Stability | 800°C | 800°C |
4. CVD diamond wire drawing die blank
Wire drawing is a metal-working process relies on a combination of a die and/or a series of dies to pull or draw a wire to a chosen gauge and is utilized to reduce the cross section of a wire.
CVD diamond consist of a metal case and a nib made from monocrystalline diamond or polycrystallie diamond (PCD) or CVD diamond.
Applications of cvd diamond : wire drawing of stainless steel, tungsten, molybdenum, copper, aluminum and others alloy, etc
Size of CVD diamond die blanks
| Product | Size (mm) | Shape | |
| CVD Serie | D | T | D—-the diameter
T—–the thickness
|
| CVDD2010 | 2.0 | 1.0 | |
| CVDD2512 | 2.5 | 1.2 | |
| CVDD3015 | 3.0 | 1.5 | |
| CVDD4020 | 4.0 | 2.0 | |
| CVDH4020 | 4.0 | 2.0 | |
5. CVD Diamond for thermal management / CVD diamond heat sinks (CVDK)
– High transmission, good thermal stability and chemical stability. CVD diamond is the best replacement of natural diamond.
– CVD diamond has low surface roughness and good cutting edge compared to PCD tools.
– CVD diamond has higher wear resistance than PCD and other diamond materials.
– The thermal conductivity of CVD diamond is 50% higher than PCD.
– Good hardness and long life exceed HPHT and natural diamond.
The case of CVD diamond plates
An Australian professor: The nitrogen content is 100ppm HPHT, which is higher than other customers require. He feels that high nitrogen content HPHT can be achieved, high CVD purity and low nitrogen content, size 2X2X2 thickness
Moresuperhard: In fact, HPHT cannot reach this thickness, and CVD is finally recommended.
Professor Australia: The CVD growth rate is a few microns per hour, which means that this 2 mm thick sample needs 27 days to grow,
Moresuperhard: CDV technology is mature, and the growth cycle can be about one week. If the nitrogen content is high, the growth rate will be accelerated.
CVD parameters
Crystal phase 111: It is grown on the 110 crystal seed, and then cut according to the 111 crystal phase
Polishing: 6 sides can be polished, generally the upper and lower sides can be polished. After 6 sides are polished, it is difficult to find 111, 111 is the upper and lower + 2 sides 111, the other 2 sides 110
Color: Nitrogen content 100ppm, somewhat similar to coffee color
Size: 3.5 * 1.5 * 1, 100ppm
