Tape casting applications multilayered ceramics

Ceramic thick films are most often used in applications where their electrical properties are exploited. In these applications, the ceramic thick films usually serve as either insulators, resistors, or capacitors. However, in many of these applications, especially those involving multilayer ceramics made from tape-cast films, the mechanical or thermal properties of the ceramic must also be considered. 

Substrates made by the multilayer process from tape cast alumina have received considerable attention in recent years for multichip module (MCM) applications. An MCM consists of an array of closely packed chips on an interconnect board several inches on a side. Cofired ceramic is attractive relative to organic laminates because its thermal conductivity is almost 2 orders of magnitude higher, an important consideration in high-density circuitry. In addition both alumina and aluminum nitride ceramics are more closely matched to silicon in CTE than are organic boards. For similar reasons, alumina and AIN are attractive for ball grid array (EGA) mounting of chips. ... 

Tape casting [CHA 94], [MIS 78] produces ceramic sheets of low thickness (25 to 1,000 micrometers) and large surface, whose homogenity, surface quality and mechanical strength in the green state are satisfactory for electrorric applications such as sirbstrates and multilayer capacitors. 

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