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NON METALLIC
MATERIALS CONTENT1. TYPES OF MATERIALS
2. SELECTION OF MATERIALS3. DEFINITION OF NON METALLIC
MATERIALS
4. VARIOUS TYPES NON METALLIC MATERIALSAND THEIR
APPLICATIONS
5. CONCLUSION
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TYPES OF MATERIALS
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SELECTION OF MATERIALS
FACTORS WHICH ARE CONSIDERED WHILESELECTING A MATERIAL FOR
MACHINEELEMENTS:-
Commercial factors such as:Cost, availability, ease of
manufacture.
Engineering properties of
materials such as:Strength, toughness, ease of forming
byextrusion, forging and casting,machinability and corrosion
resistance,hardness,ductility etc.
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WHAT IS NON METALLIC MATERIAL?Nonmetallic Materials
Materials that do not have the properties of, or do not
contain, metal and that are able to combine withhydrogen to form
stable compounds, acids, acidicoxides, and anions.
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CLASSIFICATION OF NON
METALLIC MATERIAL
NON METALLIC
MATERIAL
SYNTHETIC
MATERIALS
NATURALMATERIALS
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SYNTHETIC MATERIALS
They are manufactured from natural substances suchas oil, coal
and clay.
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CHARACTERISTICS OF SYNTHETIC
MATERIALS Good corrosion resistance
Ease of manufacture by moulding
Low cost They are durable
They are highly inflammable
Light in weight
They are affordable
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SOME SYNTHETIC MATERIALS FOR
MACHINE ELEMENTS PLASTIC:-
1. Thermoplastics- soften when heated and harden
when cooled.2. Thermosetting-permanently hardened when cooledand
can not be softened by reheating.
ADVANTAGES-
Light in weight Good resistance to shock and vibrations
Resistance to friction, wear and corrosion
Ease of fabrication into complex shapes.
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IMPORTANT VARIETIES
OF PLASTICS1. NYLON-self lubricating bearings,cams,valve
seats
and silent running gears.
2. LOW DENSITY POLYTHENE-gaskets,washers andpipes.
3. ACETAL-self lubricating bearings,cams and silentrunning
gears
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4. POLYURETHANE(DUTHANE,TEXIN)-
bearings,gears,gaskets and seals.
5. POLYTETRAFLOUROETHYLENE(TEFLON)-pistonrings,bearings,gaskets
and bellows.
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COMPOSITES
These are materials made up from, or composed of, acombination
of different materials to take overalladvantage of their different
properties.
e.g. reinforcement of air-dried bricks by mixingthe clay with
straw ,this helped to reducecracking.
Carbon fibre is used in aerospace, automotiveand civil
engineering, sports goods
http://en.wikipedia.org/wiki/Carbon-fiber-reinforced_polymerhttp://en.wikipedia.org/wiki/Carbon-fiber-reinforced_polymerhttp://en.wikipedia.org/wiki/Carbon-fiber-reinforced_polymerhttp://en.wikipedia.org/wiki/Carbon-fiber-reinforced_polymerhttp://en.wikipedia.org/wiki/Carbon-fiber-reinforced_polymerhttp://en.wikipedia.org/wiki/Carbon-fiber-reinforced_polymerhttp://en.wikipedia.org/wiki/Carbon-fiber-reinforced_polymerhttp://en.wikipedia.org/wiki/Carbon-fiber-reinforced_polymer
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COMPOSITE
THS IS AGLASS
FIBRE
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NATURAL MATERIALS
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MOSTLY USED NATURAL MATERIAL
RUBBER-
1. NATURAL RUBBER-belts ,bushes ,flexibal tubes
,vibration mounts ,production of coatings ,protectivefilms.
2. SYNTHETIC RUBBER-
I. Chloroprene-conveyer, v belts,gaskets.
II. Nitrile butadiene-bushes for flexible coupling.III.
Polysulfide-gaskets,washers and diaphragms.
IV. Silicone-seals, gaskets,o-rings.
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RUBBER
IT IS ARUBBER
BELT
