Polytetrafluoroethylene (Ftoroplast-4).
This is a plastic with high chemical
stability. Good dielectric properties, high antifriction properties. Various gaskets,
coatings, film, fibers, fabric and bearings are made from Ftoroplast-4. Processing
method - cooking, mechanical processing.
Polyvinyl chloride (vinylplast, plastic)
is used to make casing details, tapes,
conveyor tape, gaskets, linoleum and other products.
Polymethyl methacrylate (organic glass)
is much lighter than silicate glass,
does not embrittle up to 60
0
C, has good technological properties. From this glass,
details of crack technique, fences, windows are made.
Polyamides (kapron, nylon, lavsan).
From this material, various fabrics, car
cords, gear wheels, belts, bearings and other details are made.
Reactoplast is a plastic that softens once when heated and hardens when
cooled and does not soften again when reheated.
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Reactoplasts are not cold-flowing compared to thermoplastics, but they are
heat-resistant, insoluble in solvents, and swell less.
Depending on the type of filler, reactoplasts are divided into pressed powder,
fiber, and layer types.
Press powders. These materials are pressed from powders of various
substances (wood, asbestos, quartz) with phenolformaldehyde resin. Cases and
covers of accessories are made from pressed powders.
Voloknits. Fiber fillers are used in these. Voloknits have high impact
resistance and high dielectric properties.
Laminated plastics - textolite, asbotextolite, getinax, DSP, DVP. As a filler,
textile waste, paper, wood, asbestos sheets are used. Various gear wheels, floating
devices, and anti-friction details are made from laminated plastics.
Control questions.
1. What kind of material is the composite material?
2. The role of composite materials in aviation.
3. What are the properties of composite materials?
4. KM classification.
5. What is dispersion concentration based on?
6. What is the basis of fiber KM analysis?
7. Characteristics of KM with aluminum matrix.
8. Characteristics of KM with nickel matrix.
9. What are the basics of fiber cleaning?
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