Fugitive Tapes
Summary
C12 Fugitive Carbon Tapes for fabricating buried cavities, microchannels, and MEM's structures in Low Temperature Co-fired Ceramic (LTCC) multilayer devices and other laminated components.
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Description
C12 Carbon Tapes are thin flexible sheets made with specially processed, ultra-pure carbon. C12 thermally fugitive Carbon Tapes are used to form embedded channels, cavities, and MEMs structures in multilayer ceramics such as LTCC and HTCC substrates. C12 Carbon Tapes have the highest solids loading available, which results in very low sagging and crack-free laminates after firing. Other thermally fugitive pastes and materials with lower carbon loading and excessive binder content often cause stress, warping, and damage to delicate structures during firing. C12 Carbon Tapes can be a cost effective alternative to using removable inserts such as platinum or latex to create structural features. C12 Carbon Tapes do not smudge, and are easily punched or cut into complex shapes with simple tools or with low- power laser trimmers. C12 Carbon Tapes are designed to be compatible with all major commercial LTCC tape and screen printable systems.
Ultra-pure C12 Carbon Tapes are engineered to burn out cleanly in air atmospheres. C12 Carbon Tapes begin to rapidly oxidize at 600C, just as the LTCC ceramic matrix sinters, leaving behind well-defined features such as cavities and channels. C12 Carbon Tapes create precise, stress-free structures, unlike conventional fugitive materials such as waxes and polymers, which often leave residue and result in stress related deformation.
The Advantages of C12 Carbon Tape
♦ Forms in-situ, buried channels, cavities, and MEMs structures in LTCC and other multilayer composites.♦ Prevents deformation during high pressure lamination of multilayer structures.♦ Prevents slumping during firing.♦ Contains high purity carbon which burns out cleanly in air atmospheres – sublimates directly without causing stress on green parts.♦ Cost effective substitute for removable inserts (e.g. latex, platinum, etc.)♦ Does not require complex lamination and firing cycles that are necessary when using other fugitive materials such as wax or polymeric materials.♦ Compatible with all major commercial LTCC tape and screen printable systems.
C12 Carbon Tapes begin rapid burn-out (oxidation) in air just before pore closure begins in LTCC ceramic (DP951 Green Tape).
Recommended firing schedule for creating defect-free microchannels and buried cavities in LTCC multilayers.
Multilayer ceramic (Al2O3) substrate with embedded cooling channels and ports formed using thermally fugitive C12 Carbon Tape inserts.
Figure 4. Design for a ceramic (LTCC) multilayer with suspended bridge for flow sensing. Channels and bridges are created with thermally fugitive C12 Carbon Tapes.
Cross section showing buried micro- channels formed in LTCC laminate with thermally fugitive C12 Carbon Tape (approx. 130um).
Cross section showing precise channels formed in LTCC substrate with LTCC Carbon Tapes.