Boron nitride coatings

Boron nitride and titanium diboride coatings are used on graphite for the evaporation of Hquid aluminum. 

A wide range of cutting-tool materials is available. Properties, performance capabilities, and cost vary widely (2,7). Various steels (see Steel) cast cobalt alloys (see Cobalt and cobalt alloys) cemented, cast, and coated carbides (qv) ceramics (qv), sintered polycrystalline cubic boron nitride (cBN) (see Boron compounds) and sintered polycrystalline diamond tbin diamond coatings on cemented carbides and ceramics and single-crystal natural diamond (see Carbon) are all used as tool materials. Most tool materials used in the 1990s were developed during the twentieth century. The tool materials of the 1990s... 

Ceramic-coated disposable inserts, including silicon nitride, boron nitride, titanium nitride (TIN), titanium carbide (TIC) and sintered synthetic diamond ... 

Borazines, particularly polymeric compounds, have been extensively investigated as preceramic materials from which coatings and fibers of boron nitride can be produced upon thermolysis. B-aryl and halogeno-amino borazines are reported to have use as fire retardants in cotton and nylon textiles. Other reported uses for borazines are as epoxy resin catalysts, polymerization inhibitors of unsaturated alcohols and esters, and catalysts for polymerization of alkenes (95). 

Method b, the so-called hot pressing method is suitable for making dense composites. A 2D woven Hi-Nicolon tissue with or without a boron nitride coating (BN) is used as reinforcement. All of this is illustrated by the following photographs. 

The list in Table 3 is not exhaustive other typical window materials include Mylar , boron nitride, Teflon , and aluminum. Each of these materials can be modified for additional chemical resistance. For example, Kapton film can be purchased coated with graphite or Teflon , and beryllium windows can be coated with DuraCoat . There is no one window material that is suitable for all applications. The optimum choice... 

Weber A., Bringmann U. et al.. Growth of cubic boron nitride and boron-carbon-nitrogen coatings using N-trimethylborazine in an electron cyclotron resonance plasma process, Diamond Relat. Mater., 2 (1993) pp. 201-206. 

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