Monitoring electrical apparatus against overheating by the use of coating compositions containing thermoparticulatable diazonium salts
AssigneeWestinghouse Electric Corp.
InventorsJames D. B. Smith, David C. Phillips
Life of this patent
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Abstract
A composition is disclosed of a diazonium salt, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the diazonium salt in the coating forms particles in the gas stream which are detected by a monitor.
Claims33
A method of protecting electrical apparatus from damage due to overheating and for thereafter determining the location of said overheating, said apparatus including a gas stream and a monitor for detecting particles in said gas stream and for emitting a signal when said particles are detected comprising:
- A. preparing a composition which comprises about 20 to about 250 phr of at least one diazonium salt solid and stable at 50.degree. C and a solution of a resinous carrier curable and stable at 60.degree. C and unreactive with said diazonium salt;
- B. applying said composition to said electrical apparatus at positions exposed to said gas stream;
- C. evaporating said solvent and curing said resinous carrier;
- and,
- D. monitoring said gas stream for the presence of particles therein.
A thermal detection system for electrical apparatus cooled by a gas stream comprising (A) a coating of a solid layer of a resinous carrier containing about 20 to about 250 phr of an unreacted diazonium salt which is solid and stable at 50.degree. C, said coating being on a portion of said electrical apparatus exposed to said gas stream and (B) a monitor for
Dependencies are inferred from the claim text.