Silicon-caibide

Silicon Caibide - A Survey of Synthetic Approaches, Properties and Applications... 

Parche, M. C., Facts About Silicon Caibide, The Carborundum Co., Niagara Falls, NY (1961)... 

Continuous Silicon Caibide Metal Matrix Composites,Technical Brochure, Textron Specialty Materials, Lowell, MA (1994)... 

Davis, R. F., Silicon Caibide and Diamond Semiconductor Thin Films, Am. Ceram. Soc. Bull., 72(6) (1993)... 

Silicon caibide is known for its good thermal conductivity, but is a semiconductor. The addition of boron or beryllium oxide in low quantities promotes potential barriers at grain boundaries (see section 11.4.3) and confers the necessaiy insulating character. 

In summary, silicon caibide/aluminum MMCs are susceptible to localized corrosion in marine environments. Generally, the susceptibility to pit initiation is similar for conposites and uiueinforced alloys however, the rate of pit propagation is higher for composites. Silicon catbide/aluminum corrosion in seawater is increasingly more severe than in the other marine environments. Corrosion-resistant coatings are recommended for these composites to enhance their service lives. 

Aluminum oxide coatings will provide only barrier protection to the silicon caibide/aluminum conqiosites. Aluminum thermal-sprayed coatings, on the other hand, do have some sacrificial-protection c bilities. The aluminum coatings will protect expos silicon carbide/aluminum areas to a greater extent than a barrier coating. 

Magnasoft . [Union Caibide] Silicone softeners fn textiles. 

Carbides of metals and other elements have been produced by this approach, including carbides of boron, silicon, titanium, zirconium, hafnium, vanadium, niobium, molybdenum, tungsten, tantalnm, and thorium (Funke, Klementiev, Kosukhin, 1969 Sheppard Wilson, 1972 MacKinnon Wickens, 1973 Chase, 1974 Steiger Wilson, 1974 Swaney, 1974 MacKinnon Renben, 1975). The produced caibide particles are very small their diameter is usually about 20-200 mu. Halides are mixed with hydrocarbons, usually in a ratio H2 Me = 2-30. The gas mixture is heated up in plasma to temperatures of 1300-4000 K time of synthesis exceeds 50 ms. As an example, production of submicron boron carbide powder from gaseous boron trichloride and methane occurs in the strongly endothermic process ... 

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