Ceramic composites adhesion

Kay S, Thapa A, Haberstroh KM, Webster TJ. Nanostructured polymer/nanophase ceramic composites enhance osteoblast and chondrocyte adhesion. Tissue Eng 2002 8 753-61. 

Fillers, such as CaCOa or Si02, are rarely added to PSA, since they strongly reduce the tack. But flooring adhesives, ceramic tile adhesive and sealants may have filler contents from 20% to 70%. Small inorganic filler particles evenly distributed reinforce the adhesive composition and increase cohesion to a certain level. But too high filler levels will reduce the strength of the adhesive bond. Thixotropic fillers, such as Si02, reduce the sag of ceramic tile adhesives. 

Glasses may be joined to metals and other glasses by fusion. Often, glass seals must be graded through several glass compositions from one material to another due to differences in their thermal coefficients of expansion. Ceramics may be metallized and then brazed to other ceramics or metals to form hermetic joints. A ceramic-based adhesive that it is possible to use to 150°C is Ceramabond 552 . The adhesive cirres at 120°C however, the cirred material tends to be porous. 

Jayaraman et aL (1995b) deposited ultrathin Pd films (< 500 mn) on porous ceramic substrates using the sputter deposition technique. The following two parameters were found to be most critical to the synthesis of the gas-tight metal-ceramic composite substrate type (surface roughness) and deposition temperature. Fairly gas-tight Pd films with good adhesion could be coated on sol-gel derived fine pore y-alumina substrates but not on coarse a-alumina substrates. Poor adhesion between the coated film and the... 

Concrete is a particulate composite of stone and sand, held together by an adhesive. The adhesive is usually a cement paste (used also as an adhesive to join bricks or stones), but asphalt or even polymers can be used to give special concretes. In this chapter we examine three cement pastes the primitive pozzolana the widespread Portland cement and the newer, and somewhat discredited, high-alumina cement. And we consider the properties of the principal cement-based composite, concrete. The chemistry will be unfamiliar, but it is not difficult. The properties are exactly those expected of a ceramic containing a high density of flaws. 

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