Ceramic materials substrate manufacturing

Bondable substrates for aerobic and second-generation acrylics include clean as well as oily or "as received" metal polyurethanes, filled polycarbonates, filled nylon, phenolics, thermosets, wood, concrete, ceramics, glass, and other common materials of manufacture. Some thermoplastic materials are bonded better by using a second-generation acrylic adhesive. Examples are unfilled nylon, ABS, and rubber. 

Inorganic membranes are made of mainly ceramic and metallic materials. The ceramic ones are manufactured from a variety of materials including alumina, zirconia, titania and silica. The substrate (to give the thin membrane mechanical rigidity and strength) is either the same material as the membrane but with a larger pore structure, or a different material such as silicon carbide. 

Thick-film materials for AIN substrates have been in use for over a decade. Earlier, considerable effort was made on treating the surface of AIN to make it more bondable to thick-film materials. Recently, more attention has concentrated on making conductor materials more compatible with AIN substrates and overcoming difficulties with conventional thick-film materials that work well on alumina substrates but either blister or adhere poorly to AIN substrates. This development was also driven by enviroiunental concern for the use of high-thermal-conductivity beryllium oxide (BeO) ceramic, where many manufacturers felt compelled to switch to alternative substrates. Typical data for popular substrates used in high-dissipation applications are tabulated in Table 2.6. 

A wide variety of ceramic or alumina substrate materials have been developed for use in hybrids and multichip modules. These materials are the subject of specialized manufacturing processes beyond the scope of this handbook. The reader needing information on this group of materials is advised to contact a major manufacturer of ceramic materials. 

Ceramic materials are the preferred basis for thick films produced with higher temepratures. Among them are substances like aluminium oxide, glass and quartz. For lower-temperature manufacturing, the assortment of substrate materials is more versatile. Plastic foils as well as specially prepared paper or cardboard are widespread materials. 

The matching of expansion behavior is of the utmost importance to manufacturers of, for example, multi-layer capacitors, porcelain enameled cast iron sinks, fiber reinforced composites, light bulbs, etc. In all cases, various materials in rigid contact must have their expansion characteristics carefully matched. Inattention to this runs the risk of cracking and shattering of a light bulb at its seal to aluminum, delamination of metallic conductive leads from the ceramic substrate in a hybrid circuit, etc. By changing the composition of a constituent material, its... 

Rolls Royce 60 planar, on porous ceramic substrate materials, cells, stack, manufacturing, system... 

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