CVD Diamond TM
Print state
TM = thermal management grade polycrystalline CVD diamond
Choose the high-purity, low-defect growth when thermal conductivity must reach 1800 W/m·K — heat spreaders for GaN, laser-diode and RF devices.
Values for the TM condition
Other CVD Diamond tempers and conditions
CVD Diamond is listed in 5 conditions; see the grade overview at CVD Diamond.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Boron-doped conductive CVD diamond | Choose boron doping when the part must conduct: electrochemical oxidation and ozone electrodes, wastewater treatment anodes, and diamond components that have to be EDM machined. | — | 400 | 0 | — | 900 W/m·K |
Optical grade polycrystalline CVD diamond window | Pick the low-absorption, low-scatter window quality for CO₂ laser optics and output couplers, FTIR/ATR elements and high-power millimetre-wave windows. | — | 420 | 0 | — | 2,000 W/m·K |
TMThis page Thermal management grade polycrystalline CVD diamond | Choose the high-purity, low-defect growth when thermal conductivity must reach 1800 W/m·K — heat spreaders for GaN, laser-diode and RF devices. | — | 450 | 0 | — | 1,800 W/m·K |
MGDefault Mechanical / tool grade polycrystalline CVD diamond | Default polycrystalline pick where abrasion resistance and strength govern: tool cutting edges, wire-drawing dies, wear bushings and waterjet nozzles. | — | 600 | 0 | — | 1,200 W/m·K |
Single-crystal CVD diamond | Use single-crystal growth where grain boundaries cannot be tolerated: ultra-precision single-point turning tools, X-ray and quantum optics, power-electronic and detector substrates. | — | 700 | 0 | — | 2,200 W/m·K |
What is CVD Diamond TM?
CVD Diamond TM is CVD Diamond in the TM condition — choose the high-purity, low-defect growth when thermal conductivity must reach 1800 W/m·K — heat spreaders for GaN, laser-diode and RF devices. CVD Diamond TM has a tensile strength of 450 MPa (65.3 ksi), stronger than 76% of ceramic grades. Elongation at break is 0% and the elastic modulus is 1,100 GPa (159.5 Msi). CVD Diamond TM has a density of 3.51 g/cm³ (0.127 lb/in³), lighter than 68% of ceramic grades. It melts at 3,550°C (6,422 °F). MG is the default condition FabDigit quotes; TM is available on request or by drawing note.
Advantages
- Stiff — 1,100 GPa (159.5 Msi), better than 101% of ceramic grades
- Conducts heat well — 1,800 W/m·K (1,040 BTU/hr·ft·°F), better than 101% of ceramic grades
- Good corrosion resistance — 99/100, better than 100% of ceramic grades
- Polishes to a fine finish — 97/100, better than 100% of ceramic grades
CVD Diamond TM properties
Typical room-temperature values for CVD Diamond TM; 13 are specific to this condition. Other listed values are CVD Diamond reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical4
CVD Diamond TM has a density of 3.51 g/cm³ (0.127 lb/in³), lighter than 68% of ceramic grades. It melts at 3,550°C (6,422 °F).
Mechanical12
CVD Diamond TM has a tensile strength of 450 MPa (65.3 ksi), stronger than 76% of ceramic grades. Elongation at break is 0% and the elastic modulus is 1,100 GPa (159.5 Msi).
Thermal5
CVD Diamond TM is rated for continuous service to 600°C (1,112 °F). It conducts heat at 1,800 W/m·K (1,040 BTU/hr·ft·°F), better than 101% of ceramic grades. Thermal expansion is 1.1 µm/m·K (0.611 µin/in·°F).
Electrical4
CVD Diamond TM has an electrical resistivity of 1×10¹⁴ Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (99/100), better than 100% of ceramic grades.
Sustainability2
Producing a kilogram of CVD Diamond TM takes about 900,000 MJ of energy — more than 100% of ceramic grades. Typical recycled content is 0%.
Manufacturability3
CVD Diamond TM's machinability is not recommended (2/100, worse than 100% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CVD Diamond TM
Is CVD Diamond easy to machine?
Conventional cutting and grinding are ineffective: shapes are cut with picosecond or nanosecond lasers, conductive BDD grades can be wire EDM'd, and final size comes from diamond-wheel grinding and chemical-mechanical polishing.
Can CVD Diamond be welded?
Not fusion weldable; vacuum braze with Ti/Cu-Ag active fillers (TiCuSil, CuSil-ABA) at 750–850 °C, or metallize with Ti/Pt/Au first and then soft-solder or AuSn eutectic bond.
Can CVD Diamond be formed, bent or molded?
Near-net shape comes from CVD growth: deposition onto patterned Si, Mo or W substrates followed by liftoff, giving thick films of 0.1–2 mm and large-area plates up to 100–150 mm diameter.
What surface finishes work on CVD Diamond?
After laser removal of the substrate face, both sides are lapped and polished to Ra < 10 nm; optical parts receive antireflection layers such as DLC or ThF₄, and heat-sink parts are Ti/Pt/Au metallized for soldering.
CVD Diamond chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Hhydrogen from growth, mainly at grain boundaries | 0 – 0.1 | 0.02 |
| N<1 ppm optical/electronic grade; tens of ppm mechanical | 0 – 0.01 | 2×10⁻⁴ |
| BBDD conductive variant only, 1e19-1e21 cm-3 doping | 0 – 0.3 | 0 |
| Csp3 diamond; polycrystalline holds minor sp2 grain-boundary C | ≥ 99.9 (balance) | — |
CVD Diamond TM — frequently asked
What is CVD Diamond TM used for?
CVD Diamond TM is typically used for cutting tool coatings/inserts, heat spreaders for laser diodes, wire-drawing dies and optical windows. In short: highest thermal conductivity solid; hardest available tool surface; EDM-capable in doped grade.
What is the tensile strength of CVD Diamond TM?
CVD Diamond TM has a typical tensile strength of 450 MPa (65.3 ksi) — stronger than 76% of ceramic grades. Strength varies by condition: see the 5 listed tempers.
Is CVD Diamond TM easy to machine?
Not especially — machinability is rated not recommended (2/100, worse than 100% of ceramic grades). Conventional cutting and grinding are ineffective: shapes are cut with picosecond or nanosecond lasers, conductive BDD grades can be wire EDM'd, and final size comes from diamond-wheel grinding and chemical-mechanical polishing.
Can CVD Diamond TM be welded?
Not fusion weldable; vacuum braze with Ti/Cu-Ag active fillers (TiCuSil, CuSil-ABA) at 750–850 °C, or metallize with Ti/Pt/Au first and then soft-solder or AuSn eutectic bond.
What surface finishes work on CVD Diamond TM?
After laser removal of the substrate face, both sides are lapped and polished to Ra < 10 nm; optical parts receive antireflection layers such as DLC or ThF₄, and heat-sink parts are Ti/Pt/Au metallized for soldering.
Can CVD Diamond TM be formed, bent or molded?
Near-net shape comes from CVD growth: deposition onto patterned Si, Mo or W substrates followed by liftoff, giving thick films of 0.1–2 mm and large-area plates up to 100–150 mm diameter.
What is the maximum service temperature of CVD Diamond TM?
CVD Diamond TM is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- CVD Diamond Material Datasheets (mechanical / thermal / optical grades) — Element Six (2023)
- Freestanding CVD Diamond Plates and Heat Spreaders — Diamond Materials GmbH (2022)
- The Properties of Natural and Synthetic Diamond — Academic Press (J.E. Field, ed.) (1992)
- ASM Engineered Materials Handbook Vol.4: Ceramics and Glasses — ASM International (1991)
- Ioffe / NSM archive – diamond physical properties — Ioffe Institute (2021)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.