Sumitomo Electric produces a large array of high-quality materials for many kinds of industrial applications. Here we provide an overview of our materials for heatsinks, tungsten and molybdenum products, Celmet™ porous metal, infrared optical products, and superconductor products. For further details on particular products of interest, please contact us by phone or by using the inquiry form on this website.

Heat sinks/heat spreaders and submounts

We offer a variety of composite materials to use as heatsinks or heatspreaders in semiconductor devices. Each material is characterized by high thermal conductivity and low thermal expansion. Available materials include copper tungsten, copper molybdenum, aluminum nitride, copper diamond, silver diamond, aluminum silicon carbide, chemical vapor-deposited diamond, and SUMICRYSTAL™ synthetic single crystal diamond. Each material has unique characteristics to complement different kinds of semiconductors for diverse applications (communications, high-power laser diodes, aerospace, etc.). For more info on heatspreaders, click here.

In particular, silver diamond (Ag-Dia) is a next-generation heatspreader that takes advantage of silver having the highest thermal conductivity among metals. In this alloy, silver and diamond powder are combined through a proprietary sintering process that yields a material with thermal conductivity of 600 W/mK or more. This material can be manufactured in sizes larger than conventional materials, and is thus ideal as a heat dissipation substrate for bigger semiconductor devices. Ni plating and Ni/Au plating are available. Silver brazing is also available. For more info on Ag-Diamond, click here.

Tungsten and molybdenum products

With characteristics such as high melting points, low thermal expansion coefficients, and extreme stability in vacuum environments, tungsten and molybdenum are widely used for electrodes, heat and radiation shielding, light sources, and other applications. We manufacture tungsten and molybdenum products under strict quality controls, and offer these products in a variety of forms and sizes and finishes to match many different needs. Examples of finished products: tungsten sheets and plates, tungsten wires and rods, molybdenum sheets and plates, high-performance crucibles, radiation shields and weights. For more info on tungsten and molybdenum products, click here.

Celmet™ porous metal

Celmet is porous metal material that has a sponge-like, three-dimensional network structure. Compared to sintered metal and metal fiber, Celmet has much higher porosity (up to 98%) and flexibility. It is also a very workable material that can be easily cut or pressed. Celmet is available in nickel and nickel alloy (Ni-Cr or Ni-Sn), with other types in development. As for how it is used, Celmet can be found in electrodes of hybrid vehicle batteries, electrodes for water electrolysis, current collectors in stationary fuel cells, catalyst carriers in industrial plants, grease filters in kitchens, and other applications.

Infrared optical products

For infrared optics, we offer sintered ZnS lenses as a cost-effective alternative to existing lens materials for long-wavelength infrared applications (8 to 12 microns). They are available as aspherical lenses and diffractive lenses, and can be supplied as assembled modules with diamond-like coating and/or athermalized. Another optical product we offer is polycrystalline spinel substrate, which is a transparent substrate used as a window or lens for light-emitting devices. Our low-cost spinel sintered body features small polarization and high thermal conductivity.