Method of providing an object of silicon steel with a heat-resis

Details Method of providing an object of silicon steel with a heat-resis Method of providing an object of silicon steel with a heat-resis

1973-02-12

1976-05-25

Welsh, John D.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 27, 148 315, 148 614R, 427126, 252313R, H01F 104, H01L 300

Patent

active

039590348

ABSTRACT:
Electrical products formed of silicon steel are provided with a heat resistant electrical insulating coating by suspending particles of an oxide and/or of an hydroxide of earth alkali metal in an aqueous suspension, and adding to the suspension a substance capable of liberating hydroxyl ions which is volatile at a temperature below that at which silicate is formed. Examples of such a substance are ammonia and organic amines. There may also be added to the suspension silicon dioxide particles which are capable of oxidizing silicon to silicon dioxide at temperatures below 1300.degree.C.

REFERENCES:
weiser, H. B., Inorganic Colloid Chemistry, Vol. II (1935), pp. 5 and 6, John Wiley & Sons, Inc.

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