SUBJECT: BASIC TECHNOLOGY
CLASS: JSS 2
TOPIC: USES OF MATERIALS
USES OF WOOD
Wood is used today in the following industries and processes:
USES OF WOOD
In the building industry for roofing and garages, doors and partitions.
Railway sleepers, heavy gate posts, decorative panel stairways. Pattern making joinery.
Aircraft industry, ship masts, interior joinery, ladders, packing cases.
Ship building, good quality furniture.
Joinery and furniture.
Model making, life rafts life belts. Insulation (noise or heat).
Furniture mallets, kitchen utensils e.g. bread boards, rolling pins.
Pier piles, dock, gates, bridge building.
Cabinet making, ship building, panelled, carving, wood turnery. veneers
Furniture making , boat building , veneer, plywood
Interior joinery, furniture, model making.
Ship building , furniture, laboratory benches, veneers
USES OF FERROUS METALS
Mixture of carbon and iron carbon content is between 1.5-5%
Vary with carbon content. Brittle with hard skin
Suitable for moving parts of machinery because of the ability of one piece to slide on another due to carbon content.
99% iron with small amount of impunities
Malleable and ductile. Elastic can be shaped easily when red hot (forged)
Engine blocks haulage gear, vices, crane, hooks and chains
High carbon steel (Tool steel, cast steel)
99% iron with small amounts of impunities. The carbon content is between 0.1-0.5%
Malleable and ductile. Elastic. Not very hard. Can be shaped easily when red hot(forged)
Haulage gear, crane hooks and chains, anchor chains, general constructional work, nuts, bolts, screws, non-cutting tool, steel sheets.
Low carbon steel (mild steel)
Mixture of carbon and steel
Forges and machines well
All kinds of cutting tools. Steel sheets
USES OF NON-FERROUS METALS
It is used for making aircraft, electrical cables, and aluminium, foil, engine parts tubes boxes, kitchen and cooking utensils.
It is used for making roofing sheets containers, galvanizing and protective, cooling on sheet, sheet and base for many alloys (e.g. brass).
It is used as base for many alloys e.g. bronze, protective coating on copper wire and tin plate sheets.
It is used in making many copper alloys, soldering bits, decorative purposes, wire, electrical point, boiler tubes, rivets, boxes, bowland pipes.
It is used for making battery elements, water piping base for many alloys and sheeting for roofing.
USES OF ALLOYS OF NON-FERROUS METALS
Read “USES OF MATERIALS II”
(a) Cast iron (b) High carbon steel
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