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Reaction Bonded Silicon Carbide

II-VI, the high power CO2 and Fiber laser solution center is once again bringing you the next generation of high power laser optical materials. In collaboration with our wholly owned subsidiary M Cubed Technologies, II-VI is working to develop materials tailored for the future of high power laser processing. Engineered materials such as Reaction Bonded SiC (RB SiC) and Reaction Bonded SiC + Diamond (RB SiC + Diamond) combine all of the best material properties of traditional mirror materials into one optimized material solution.

Advantages of RB SiC over traditional high power mirror materials:

  • Coefficient of thermal expansion 5x lower than copper reduces the deformation of the optical surface due to the thermal load.
  • Density 3x lower than copper reduces the weight of the mirror and allows for use in cutting heads that require fast movement of the head.
  • Ability to add internal water cooling channels gives it an advantage over Si mirrors.
  • Ability to directly polish with roughness < 40Å and coated with any II-VI high reflector coating.

Reaction Bonded SiC + Diamond

If even greater thermal load handling capability is required RB SiC + Diamond could be the answer. With a CTE similar to CVD Diamond and a Thermal Conductivity greater than any traditional metal substrate SiC + Diamond is the ideal material for high thermal loads.

Advantages of RB SiC + Diamond :

  • Potential to achieve a coefficient of thermal expansion nearly 14x superior to copper with a thermal conductivity that is 1.6x higher.
  • Ability to create internal water cooling structures similar to RB SiC
  • Ability to directly polish with roughness < 40Å and coated with any II-VI high reflector coating.

Materials Stability Chart

Materials Properties

Material properties of RB SiC vs. standard mirror materials

Material Density (g/cc)

Young’s Modulus (GPa)

Thermal Cond. (W/mK)

CTE
(ppm/K at RT)

RB SiC

2.95

344

151

2.9

Copper

8.96

117

390

16.7

Silicon

2.33

131

156

2.6

Aluminum

2.7

69

167

22.5

Material properties of RB SiC vs. standard mirror materials 

Material properties of Reaction Bonded SiC + Diamond

Formulation Density (g/cc)

Young’s Modulus (GPa)

Thermal Cond. (W/mK)

CTE
(ppm/K at RT)

RB SiC

2.95

344

151

2.9

RB SiC + Diamond -1.8

3.17

485

280

1.8

RB SiC + Diamond -1.5

3.23

545

430

1.5

RB SiC + Diamond -1.2

3.33

700

620

1.2

Material properties of Reaction Bonded SiC + Diamond

Thermal Grade Polycrystalline CVD Diamond

II-VI has developed processes to deliver wafers of polycrystalline CVD diamond at diameters of up to 145mm with exceptional thermal properties. With the ability to target a range of thermal conductivities from 1,500 W/mK to more than 2,200 W/mK, II-VI Advanced Materials can meet the needs in the most demanding thermal applications.

II-VI has been running production-level diamond growth processes for a world-wide customer base since 2010. We have established high repeatability and reliability in producing diamond materials at even the toughest specifications. We are prepared to handle high volume production requirements for thermal management applications.

Coupling our thermal management growth process with a world-class optical fabrication facility, II-VI can deliver laser machined, optically polished thermal materials to meet strict bow, warp, and surface roughness specifications to ensure optimal thermal contact to your high powered device. In addition to growth and fabrication, our staff are ready to work with customers through the use of internal metrology such as lamp flash thermal diffusivity measurements and SEM as well as thermal models to engineer application specific solutions.

II-VI Diamond Thermal Management solutions

  • Thermal conductivity tailored to suit both performance and cost requirements
  • Custom sizes and shapes for your specific solution
  • Optical transparency when needed
  • Means to quantify bonding efficacy and stack performance

Our flagship T-2200 Diamond Thermal Management Material couples extraordinary thermal conductivity of better than 2,200 W/mK with high transparency in a wide range of wavelengths (e.g. 1um, 10.6um, IR, Microwave) making it ideal for high power optoelectronic applications. In addition state of the art, high performance optical coatings can be applied to further improve diamond’s already superb optical properties.

The T-1500 Diamond Thermal Management Material, with thermal conductivity of better than 1,500 W/mK is an outstanding thermal management solution for a wide array of applications. This high performance material may be used in more price sensitive applications with the same optical finishes from our world-class optical fabrication facility.

 

Material Properties
Structure cubic, polycrystalline
Grain Size Thickness and process dependent (0.05 - 1mm)
Grades T-1500, T-2200
Thickness* up to 2mm
Fabrication Capability*
Size Laser-cut to customer specification, maximum diameter 145mm
Dimensional Tolerance +/- 50µm
Polishing Aspect Ratio Up to 50:1 for diameters up to 145mm
Bow 4µm/cm
Warp 4µm/cm
Local Thickness Variation 1µm/cm are achievable
Surface Roughness <15nm
Thermal Properties T-1500 T-2200
Thermal Conductivity >1,500 (W/mK) >2,200 (W/mK)
Thermal Diffusivity >800(mm-2/sec) >1150(mm-2/sec)
Thermal Expansion Coefficent 1 (10-6 K-1) 1 (10-6 K-1)
Specific Heat (25ºC) 0.536 (J g-1 K-1) 0.536 (J g-1 K-1)
Reaction Bonded Silicon Carbide
II-VI, the high power CO2 and Fiber laser solution center is once again bringing you the next generation of high power laser optical materials. In collaboration with our wholly owned subsidiary M Cubed Technologies, II-VI is working to develop mat... Read More
Thermal Grade Polycrystalline CVD Diamond
II-VI has developed processes to deliver wafers of polycrystalline CVD diamond at diameters of up to 145mm with exceptional thermal properties. With the ability to target a range of thermal conductivities from 1,500 W/mK to more t... Read More
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