Unit 6 - Materials And Their Properties Flashcards

Question

What is wrought iron

Answer 1

100% iron Properties: fibrous, tough, ductile, rust resistant

Answer 2

94-98% iron , 2-6% carbon Properties: strong but brittle, high compressive strength

Answer 3

Iron, nickel and chromium(% differs by grade) Properties: tough, resistant to rust, subject to stains

Answer 4

Carbon 0.6-1.4% Iron 98.6-99.4% Properties: tough, can be hardened and tempered

Answer 5

Carbon ->0.1-0.3% iron 99.9-99.7% Properties: tough, high tensile strength, can be hardened, rusts easily

Answer 6

Good corrosion resistance, particularly in sulphurous atmospheres and are used as access fittings for chimneys

Answer 7

Bright golden-yellow, very strong and resistant to corrosion. Can be made soft and ductile

Answer 8

An example of a wrought alloy as it contains about 1% aluminium, iron, nickel and manganese

Answer 9

A resin solid at room temp but becomes soft plastic when heating crossing the glass transition temperature

Answer 10

Injection moulding or blow moulding as set as shape of mould

Answer 11

The reversibility of the process allows it to be used for more a different product at the end of its lifespan

Answer 12

Polyethylene. PE Polycarbonate. PC Polyvinyl chloride. PVC

Answer 13

A harder and more rigid plastic than thermosetting which cannot be reheated. The polymers become cross linked together and cannot be broken

Answer 14

Urea-formaldehyde foam- used in plywood and mdf boards Melamine resin-used on worktop surfaces Diallyl-phthalate (DAP) - electrical connectors Epoxy resin- fibre-reinforced plastics Silicone resin- ceramic matrix composite

Answer 15

A form of plastic with loosely cross linked polymers eg rubber

Answer 16

Flexible and elastic ( can be stretched easy and return to original shape when force removed)

Answer 17

A polymer matrix reinforced with fibre or other reinforcing materials. The matrix protects the fibres from external and environmental damage and the fibres strengthen and stiffen the matrix to resist cracks/fractures

Answer 18

MDF- compressed wood fibres Plywood- thin layers of wood bonded with grain ms at right angles Glass reinforced plastic(GRP)- epoxy resin or polyester resin recorded with glass fibre matting Carbon fibre reinforced plastic- epoxy or polyester resin backed with carbon fibres that are baked to set

Answer 19

Make mould. Add roving to sprayed on fibre glass. Add deck

Answer 20

Weight Weather resistance Moulded into any shape Lightweight

Answer 21

A long chain of monomers as poly mean many in Greek

Answer 22

A flexible metal forming process which uses brake press or a similar press method to press sheet metal over a die block into a shape. It does not actually create a hole.

Answer 23

A process that reduces thickness of metal

Answer 24

Enhanced toughness and ductility and affects the shape as much larger than cold rolling However it is susceptible to shrinkage

Answer 25

A process that shapes metal as it passes through multiple sets of rollers. These continuously form and bend the sheets into desired shape.

Answer 26

A process where metal is hardened by plastic deformation at temperatures below recrystallision temperature.

Answer 27

Internal and residual stresses build up in the metal which may lead to cracks. The metal has a high uniformity

Answer 28

No internal stresses build up and it can remove cracks and faults. It is important in increasing the ductility of the metal

Answer 29

A form of metal processing where the workpiece is simultaneously bent and stretched over a die. It occurs through radial strain and is used for large parts

Answer 30

Common metal forming process that is where the sheet is clamped and placed over a cavity shaped due to form hollow components. The tensile strength applied to the sheet is deformed to the external shape of the part

Answer 31

Also called frittage. A process of forming a solid mass through heat, pressure but without liquefaction. It involves the atoms diffusing across the particle boundary and fusing

Answer 32

Strength Integrity

Answer 33

Prosperities can change depending on the environment

Answer 34

Certain crystals such as quartz, when a force or pressure is applied causes a voltage to be set up. When reversed an a voltage is applied it can cause twists or bends in a controlled manner

Answer 35

Shape memory alloys are a combination or multiple metals which have been deformed as a result of heat or external forces. They return to the original or permanent shape when heated

Answer 36

A material that acts as an insulator in its normal state but under compression becomes a conductor

Answer 37

Diverse range of uses Strength Corrosion resistance Ability to replace living tissue High level of recoverable plastic straon

Answer 38

Expensive Poor fatigue Potential to over stress Sensitivity to fabricated properties Stress can build within thin films Low maximum frequency

Answer 39

Materials produced by combining ceramics and metallic powders through sintering. The powders are heated then placed in a die under pressure until particles bond

Answer 40

Very hard and stable but brittle and breakable if dropped

Answer 41

Softwood, hardwood and engineered wood

Answer 42

Not natural but manufactured from waste wood to have certain wualities

Answer 43

From trees without needles or cones also known as deciduous trees. Trees that produce leaves and seeds. They are typically more expensive

Answer 44

From wood and lumber which are milled from conifer trees which have needles and cones such as pine, cedar, spruce etc

Answer 45

Softwood I’d evergreen trees which grow faster and are cheaper. They can be seen as different by the structure of their grain

Answer 46

Engineered wood made from wood fibres mixed with steam and heat then compressed into boards. Used on the construction industry because of its strong and dense properties

Answer 47

Made of sheets of wood veneers called piles which are glued together. It is used to construct furniture, floors and walls. It is strong yet adaptable

Answer 48

Made from small waste wood particles compressed and bonded with resin. It is an affordable yet sustainable choice

Answer 49

Appear most in plastics and polymers. They are long strong molecules consisting of carbon atom’s covalently bonded with other atoms. They are very strong and take strong forces to rupture. The bonds between molecules that slide are called van der walls forces

Answer 50

A 3D pattern called a crystal lattice with uniform intermolecular forces

Answer 51

Shapeless , disordered and irregular arrangement of the particles of a solid. The intermolecular forces and distances between the particles are not the same