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Coating for cast iron to resist molten aluminum

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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 deg C metal and the cast iron body is getting melted within 48 hours. Is there is any corrosive resistant coating available to protect cast iron body under this circumstance to increase its life?

K. Annamalai
plating shop - Chennai, Tamil Nadu, India

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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 Aluminum and Al Alloys, it will be effective to about 2000 C.

Good luck & Best regards,

Jim Sivertsen
Refining & Alloys - Alden, New York

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Dear Sir,

Stellite 6 coating can very well withstand that temperature and thermowell shall not have any problem.

J.V.PAWAR
- Pune, Maharashtra, India

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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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