Modern materials

Question 1

what are modern materials?

Answer 1

materials developed by engineers and scientists based on research and experimentation

Question 2

name 4 modern materials

Answer 2

Kevlar
Polymorph
Precious metal clay
High density modelling foam

Question 3

what fibre is kevlar?

Answer 3

Aramid

Question 4

what does kevlar do?

Answer 4

stops bullets and offers thermal protection at 120 degrees

Question 5

properties of kevlar

Answer 5

• lightweight
• hardwearing
• stronger than steel
• heat resistant
• chemical resistant

Question 6

who discovered Kevlar?

Answer 6

DuPont Laboratories

Question 7

Where is kevlar used?

Answer 7

bulletproof vests
protective clothing+ accessories
additive in composite materials

Question 8

What vehicles use Kevlar and why?

Answer 8

Eurofighter 
-makes it fly faster and father 
Land + Sea and Air
-tougher 
-safer
-Lighter

Question 9

what is polymorph?

Answer 9

thermoplastic modern material that becomes malleable at low temperatures [low melting temperature]

Question 10

what temperature does polymorph become malleable?

Answer 10

62 degrees

Question 11

properties of polymorph

Answer 11

• tough and durable when cooled
• easily hand moulded
• can be remoulded
• non toxic
• biodegradable

Question 12

where is polymorph used?

Answer 12

• handles
• orthodontic moulds
• gum sheilds

Question 13

what is precious metal clay [PMC] made from?

Answer 13

precious metal particles held in a water based, non toxic, organic binder

Question 14

advantages of PMC

Answer 14

• easy to work with
• minimal tools
• fired in kiln or with butane torch
• set stones in it
• slip can join clay parts
• low setup cost

Question 15

disadvantages of Precious Metal Clay

Answer 15

• dry out when worked with
• not as strong as sterling silver
• relatively expensive
• specialist tools for firing

Question 16

what happens during the firing process and what does it leave us with?

Answer 16

• moisture and binding agents burnt off

- product containing 90% precious metal left

Question 17

how much does PMC shrink by?

Answer 17

5-15%

Question 18

What are the properties of High density modelling foam?

Answer 18

• rigid
• lightweight
• strong
• cheap
• holds surface detail well

Question 19

how can HDMF be shaped?

Answer 19

• CNC milling
• Routing
• By hand

Question 20

what can be used on HDMF to get a high quality finish?

Answer 20

• fillers
• primers
• paints

Question 21

what 2 processes use moulds made from HDMF?

Answer 21

vacuum forming and casting metals at low temperatures