Glass materials (Preforms and Alumino Silicates) <ul><li>Glass Preforms allow hermetic seals between ceramic and metal parts. </li></ul><ul><li>Glass Preforms – wide range of thermal expansion coefficients available </li></ul><ul><li>Hybralox Glass – Alumina loaded glass for stronger sealing </li></ul><ul><li>Alumino Silicates are high glass content materials used for low thermal expansion, high thermal shock resistance. </li></ul><ul><li>Steatite </li></ul><ul><li>Lava </li></ul><ul><li>Cerasil </li></ul>
Ceramic assemblies Ceramic to metal assemblies Medical grade feedthrus High power feedthrus Coatings available
Ceramic assemblies - Bonding Diffusion bonding – ceramic to ceramic Cofiring – Platinum into alumina Frit bonding – High glass content intermediary layer. Brazing – Various alloys and ABA’s Glue - Various epoxy’s Mechanical - Threading or bolting Sectioned braze joint Cross section of diffusion bonded ceramics
Braze alloys High purity, low vapor pressure brazing alloys. Precious and non-precious. Active braze alloys – Do not need an intermediary layer as it directly wets to ceramic. Braze alloys are typically used to join ceramic to metal assemblies, form electrical paths, and create heaters.
Metal injection molding Stainless steel: (i.e. 17-4 PH SST, 316L SST, 304L SST, F-15) Tungsten Copper Almost any metal that starts out as a powder can be injection molded Parylene coating available
Coatings (for ceramics) Metallizing (moly+nickel, sputter, ABA) – thick or thin film process. D eveloped for hermetic braze seals, it can also be used to conduct electrical current. Anti wetting surface treatment – durable as the base material. Frit or Preforms – high glass content DLC - diamond like coatings (amorphous carbon) – Contact angles to 110 degrees. Solid lubricant, protective hard coating. Charge dissipative ceramic – fired into the ceramic surface Parylene (Insul-Cote P) – vacuum deposited conformal pin-hole free coating. Biocompatible, electrically insulative and low coefficient of friction. Works on many materials.
Coatings (for MIM parts) Parylene – bulk parts or wire can receive this. Replaces epoxy in many applications. Non porous, conformal, autoclave, biocompatible, and low in friction. DLC – (diamond like coating) Ion beam or RF plasma process. Transparent, hard, elastic, low friction, chemically inert, electrically insulative.
Alumina ceramic forming Isopressing – High purities. Suitable for volumes of 1 to thousands. Quick turn. Drypressing – High purities. Suitable for higher volumes in the thousands. Tooling required. Injection molding – High purities. High volumes. Very complex shapes. Tooling required. Slip casting – Low purities. Suitable for volumes in 100’s. Tooling required. Inexpensive big parts. Extrusion – High purities. Low cost. Tube shapes only. Multiple bores possible. Only length can be tight tolerance. Tape casting – High purities. Low cost. Any volume.
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