::FUEL CELLS::


DynaporeŽ porous metal laminates have found successful application in the emerging fuel cell technology market in the thermal management, flow distribution, membrane support and current collection components of the fuel cell stack. DynaporeŽ materials are an attractive alternative to traditional fuel cell stack materials due to DynaporeŽ's unique set of properties.

Some of the benefits of DynaporeŽ porous metal laminates include:

  • Low thermal and electrical resistance due to metallurgical bond between each layer
  • High surface area
  • Highly uniform flow distribution
  • Precise control of pore size and flow permeability
  • High strength
  • Low cost when compared to traditional fuel cell plate materials
  • Easily modified using existing metal fabrication technology
  • Uniform support of MEA (membrane electrode assembly)
  • Low pressure drop

Typical DynaporeŽ materials are constructed of multiple layers of wire mesh that are diffusion-bonded (sintered) together using pressure and heat to form a rigid sheet of porous material with each intermediate layer metallurgically bonded together. DynaporeŽ porous metal laminates can also incorporate the use of other metallic structures such as metal foils, etched metal foils, metal foams, and powder metal to produce unique structures with a diverse set of properties.

A lateral cross-section of a DynaporeŽ structure that may be utilized in a fuel cell bipolar assembly is illustrated below:

The above illustration is just one example of an endless array of possible DynaporeŽ formulations. For example, a different DynaporeŽ laminate might utilize a layer of etched metal foil, a layer of metal foam, and a layer of fine wire mesh. An interesting aspect of this formulation is the use of a fine mesh layer bonded to the metal foam layer. The fine wire mesh layer affords protection to the MEA from the sharp edges of the metal foam and provides uniform support of the MEA. As can be seen, the commonly used combination of foil and foam is improved upon with the addition of the fine wire mesh layer. The foil-foam structure is further improved by the diffusion bonding process yielding a material with high thermal and electrical conductance and improved structural characteristics.

::FUEL REFORMING::


DynaporeŽ sintered porous metal materials have also found application in various parts of a fuel reforming system. For example, DynaporeŽ materials have been successfully implemented as catalyst support screens, as heat exchange material, and gas distribution media. Typical DynaporeŽ sintered porous metal materials are constructed of multiple layers of wire mesh that are diffusion-bonded (sintered) together to form a rigid sheet of porous material. DynaporeŽ can also be constructed using other metallic materials such as foil sheets, metal foams, perforated sheet metal, and metal powders. The possibilities are endless and therefore make DynaporeŽ a truly unique engineered material.

DynaporeŽ superior engineered materials feature:

  • Uniform pore size
  • Controlled flow permeability
  • High surface area
  • High thermal conductivity
  • High strength

DynaporeŽ laminates are available in a wide variety of alloys including:

  • AISI 300 series stainless steel
  • Monel 400
  • Copper
  • Carpenter C-22

An example of a DynaporeŽ laminate that might be used as a catalyst support screen is illustrated below:

Specialty DynaporeŽ structures have been developed that address multiple design requirements in one engineered material. An example of such a structure is illustrated below:

The above structure functions both as a catalyst support screen and a highly efficient heat exchanger. This DynaporeŽ laminate is gas permeable and incorporates heating or cooling tubes embedded within the structure. The embedded tubes are sintered to the surrounding wire mesh layers to form a continuous metallic bond between the tubes and the wire mesh. The resulting engineered material exhibits superior thermal heat exchange, high strength, controlled permeability, and uniform catalyst support.

The DynaporeŽ materials illustrated above are only a small sampling of a wide array of sintered porous metal materials available from MKI. We invite you to explore the many exciting possibilities DynaporeŽ has to offer to your reforming and fuel cell system development.




Martin Kurz & Co., Inc.

8439 Triad Drive • Greensboro, NC, USA 27409
Ph: 336-217-3814 • Fax: 336-668-4452
Email: