Mica electrical insulating materials. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Mica electrical insulating materials. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electricity for beginners

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These materials consist of mica sheets glued together with some kind of resin or adhesive varnish. The glued mica materials include micanites, mikafolium and mica tapes.

Glued mica materials are mainly used for insulating windings of high voltage electrical machines (generators, electric motors), as well as for insulating low voltage machines and machines operating under difficult conditions.

Micanites are hard or flexible sheet materials obtained by gluing plucked mica leaves with shellac, glyptal, organosilicon and other resins or varnishes based on these resins.

The main types of micanites are collector, gasket, molding and flexible.

Collector and gasket micanites belong to the group of solid micanites, which, after gluing mica, are pressed at elevated specific pressures and heating. These micanites have less shrinkage in thickness and greater density.

Moldable and flexible micanites have a looser structure and lower density.

Collector micanite is a solid sheet material made from mica sheets glued together with shellac or glyptal resins or varnishes based on these resins. To ensure mechanical strength when working in the collectors of electrical machines, no more than 4% of the adhesive is introduced into these micanites.

Gasket micanite is a solid sheet material made from plucked mica leaves glued together with shellac or glyptal resins or varnishes based on them. After gluing, the sheets of cushioning micanite are pressed. This material contains 75-95% mica and 25-5% adhesive.

Molding micanite is a solid sheet material made from plucked mica leaves glued together with shellac, glyphthalic or organosilicon resins or varnishes based on them. After gluing, the molding micanite sheets are pressed at a temperature of 140-150°C.

Flexible micanite is a sheet material that is flexible at room temperature. It is made from plucked mica leaves glued together with oil-bitumen, oil-glyphthalic or organosilicon varnish (without desiccant), forming flexible films.

Certain types of flexible micanite are glued on both sides with mica paper to increase mechanical strength.

Flexible glass micanite is a sheet material that is flexible at room temperature. This is a kind of flexible micanite, characterized by increased mechanical strength and increased resistance to heat. This material is made from leaves of plucked mica glued together with organosilicon or oil-glyptal varnishes, forming flexible heat-resistant films. Sheets of flexible glass micanite are pasted over on both or one side with alkali-free fiberglass.

Micafolium is a roll or sheet electrical insulating material molded in a heated state. It consists of one or more, more often two or three, layers of mica sheets glued together and with a sheet of paper 0,05 mm thick, or with fiberglass, or with a fiberglass mesh. Shellac, glyptal, polyester or organosilicon are used as adhesive varnishes.

Micale tape is a rolled electrical insulating material that is flexible at room temperature. It consists of one layer of plucked mica leaves glued together and pasted over on one or both sides with thin mica paper, fiberglass or fiberglass.

Oil-bitumen, oil-glyphthalic, organosilicon and rubber solutions are used as adhesive varnishes.

Mikashelk is a rolled electrical insulating material that is flexible at room temperature. Mikashelk is one of the varieties of mica tape, but with increased mechanical tensile strength.

It consists of one layer of plucked mica leaves, glued together and pasted over on one side with a natural silk cloth, and on the other with mica paper. As adhesive varnishes, oil-glyphthalic or oil-bitumen varnishes were used, forming flexible films.

Mikapolotno - rolled or sheet electrical insulating material, flexible at room temperature. The mica canvas consists of several layers of plucked mica glued together and pasted over on both sides with cotton fabric (percale) or mica paper on one side and cloth on the other.

Micalex is a mica plastic made by pressing a mixture of powdered mica and glass. After pressing, the products are subjected to heat treatment (drying).

Mikalex is produced in the form of plates and rods, as well as in the form of electrical insulating products (panels, bases for switches, air capacitors, etc.). When pressing mycalex products, metal parts can be added to them. These products lend themselves to all types of mechanical processing.

Author: Smirnova L.N.

See other articles Section Electricity for beginners.

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