CVD Diamond MG
Grade · default condition
MG = 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.
Values for the MG 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 |
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 |
MGDefaultThis page 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 MG?
CVD Diamond MG is CVD Diamond in the MG grade — default polycrystalline pick where abrasion resistance and strength govern: tool cutting edges, wire-drawing dies, wear bushings and waterjet nozzles. CVD Diamond MG has a tensile strength of 600 MPa (87 ksi), stronger than 78% of ceramic grades. Elongation at break is 0% and the elastic modulus is 1,050 GPa (152.3 Msi). CVD Diamond MG 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).
Advantages
- Stiff — 1,050 GPa (152.3 Msi), better than 100% of ceramic grades
- Conducts heat well — 1,200 W/m·K (693.3 BTU/hr·ft·°F), better than 100% of ceramic grades
- Good corrosion resistance — 99/100, better than 100% of ceramic grades
- Polishes to a fine finish — 95/100, better than 97% of ceramic grades
CVD Diamond MG properties
Typical room-temperature values for CVD Diamond MG; 12 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 MG 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 MG has a tensile strength of 600 MPa (87 ksi), stronger than 78% of ceramic grades. Elongation at break is 0% and the elastic modulus is 1,050 GPa (152.3 Msi).
Thermal5
CVD Diamond MG is rated for continuous service to 600°C (1,112 °F). It conducts heat at 1,200 W/m·K (693.3 BTU/hr·ft·°F), better than 100% of ceramic grades. Thermal expansion is 1.1 µm/m·K (0.611 µin/in·°F).
Electrical4
CVD Diamond MG has an electrical resistivity of 1×10¹² Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (99/100), better than 100% of ceramic grades.
Sustainability2
Producing a kilogram of CVD Diamond MG takes about 900,000 MJ of energy — more than 100% of ceramic grades. Typical recycled content is 0%.
Manufacturability3
CVD Diamond MG's machinability is not recommended (2/100, worse than 100% of ceramic grades).
Common Calculations4
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CVD Diamond MG
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 MG — frequently asked
What is CVD Diamond MG used for?
CVD Diamond MG 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 MG?
CVD Diamond MG has a typical tensile strength of 600 MPa (87 ksi) — stronger than 78% of ceramic grades. Strength varies by condition: see the 5 listed tempers.
Is CVD Diamond MG 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 MG 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 MG?
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 MG 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 MG?
CVD Diamond MG 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.