Letter 30012

Coating for cast iron to resist molten aluminum  

++++ We are using cast iron thermocouples to sense the Aluminium metal temperature. That cast iron body will be always inside the furnace which has 680' c metal and the cast iron body is getting melted within 48 hours. Is there is any corrosive resist coat available to protect cast iron body under this circumstance to increase its life? K.Annamalai plating shop - Chennai, tamil nadu, India ++++ You may want to try a Boron Nitride coating. It's available in a spray or may be brushed on like paint. Boron Nitride will resist wetting by molten Al & Al Alloys, it will be effective to about 2000 C. Good luck & Best regards, Jim Sivertsen Refining & Alloys - Alden, N.Y., U.S.A. ++++ Dear Sir, Stellite 6 coating can very well withstand that temp & thermowell shall not have any problem. J.V.PAWAR - Pune, Maharashtra, India ++++ Thermocouple tubes are being coated with Boron Nitride Coatings in India to extend the life of the tubes. Regards, Mr. Manoj Saraf - Kolkata, India

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