Refractory oxide coatings

Refractory Oxide Coatings on Silica-Forming Ceramics. 366... 

Other refractory oxide coatings are also candidates, however the problem of CTE mismatch must be considered (Table 7-2). Graded coatings may be a possibility. Stability of the coating/substrate interface is also a critical issue. 

Refractory compound coatings of carbides, nitrides, and oxides on cemented carbide cutting tools, mainly by the CVD process, are estimated at 300 X 10 annually worldwide. 

Other important properties of Cr02 when used as a magnetic pigment are its black color, electrical conductivity (2.5-400 O-1 cm-1 [5.27]) and relatively high crystal hardness (Mohs hardness 8-9 [5.20]). Therefore, coating formulations based on Cr02 require less or even no additives such as carbon black (good conductivity, black color) or refractory oxides such as alumina. 

Layers of highly refractory oxides can be produced by high-tcmpcrature spraying, i.c. by introducing the powdered oxide into a gas or plasma burner the particles are melted by the burner in the form of droplets, and fall onto the cooler surface where they solidify. These coatings can be applied on metals as well as on ceramic materials. 

Use Ceramics abrasive for glass polishing opacifi-er in photochromic glasses retarder of discoloration in glass, especially radiation shielding and color TV tubes catalyst enamels and ceramic coatings phosphors cathodes capacitors semiconductors refractory oxides diluent in nuclear fuels heat stabilizer (alumina catalyst). 

Refractory metal coatings [34], such as Re/Ir coating for the oxidation resistance and gas tightness of composite chamber at ultra-high... 

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