Sol-gel coating processes

Sol—gel, alumina derived from, 23 76—78 Sol-gel bioactive glasses, 23 82-83 Sol-gel chemistry aerogels, 1 749-753 ceramics processing, 5 642 Sol-gel coatings, 5 665... 

The sol-gel coating technique offers the opportunity of a future automated coating process for micro structured reactors. After reactor bonding, the sol, which has a much lower viscosity than wash coat slurries, may simply be pumped through the... 

Buelna, G. Lin, Y.S. Preparation of spherical alumina and copper oxide coated alumina sorbents by improved sol-gel granulation process. Microporous Mesoporous Mater. 2001, 42, 67-76. 

The term controlled index means that the refractive index can be made smaller than that of the bulk precursor by controlling the microstructure via the porosity. When silica is deposited, for example, the film index n can be varied over a wide range (7) from n = 1.1 to 1.5. This process control makes sol-gel coatings interesting for many optical, electronic, and sensor applications, but the evolution of the microstructure during film formation is not well understood, in spite of efforts to survey the variables (8, 9). This chapter reviews the important factors determining the microstructure of dip-coated films and explores at length two of them, evaporation and surface tension. 

Hybrid sol-gel technology provides control of the coating composition and structure at relatively low cost and high process flexibility [6]. Here, the treatment of the surface of the AA2024-T3 aluminium alloy by application of a hybrid sol-gel coating containing cerium oxide nanoparticles has been examined. 

---