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This Nanmac NC-11 metal-ceramic protection tube is a hard, abrasion-resistant, dense material made from two high temperature compatible materials. The combination of this high temperature metal and oxide produces a product with these very important properties: superior oxidation resistance to 2,500 degrees Fahrenheit, available in thermocouple types J, K & N, thermal conductivity comparable to that of stainless steel, and good resistance to wetting by most molten metals (not for use with molten aluminum).
NC-11 has good strength at temperatures where many high-temperature metals melt. Above approximately 2,800 degrees Fahrenheit NC-11 begins to soften and becomes plastic. NC-11 thermocouple protection tubes have however, been used successfully for dip immersion at a temperature of 3,000 degrees Fahrenheit. In use or servce, care must be take to avoid conditions of extreme thermal shock, extreme thermal gradients, mechanical shock, and impact. Although, NC-11 is superior to ceramics in all of these properties. It is less resistant to shock and impact that the metallic alloys. Therefore, it should be preheated to about 900 degrees Fahrenheit before immersion in molten metal at 2,000 degrees Fahrenheit or higher. Whenever practical, the following prehead procedure can also be used. Hold the tube immediately above the molten steel for approximately one minute before immersing. Click the link provided for information about corrosion resistance and melting points of different materials.
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