IB Design Technology - Topic 4: Metals and Glass

Oxidation

________- Occurs when oxygen gas is present or when exposed to an extremely high /low pH level.

Pure iron

What is too soft and ductile but many alloys can be made with it? Answer with a single words or term.

Metal oxides

What are often added to glass to add color? Answer with a single words or term.

Recovery

________- The collection of used metal for reuse.

Superalloy

________- Extremely durable alloy used at high temperatures, usually at or above 75 % of its melting point.

Pyrex

________- Borosilicate glass, less susceptible to thermal shock, used for cooking.

Biodegradeable

________- Breaks down easily and is not harmful to the environment.

Grain size

________ can also be controlled via hardening, tempering, normalizing, and annealing.

Crystals

________ grow into dendrites (think neurons) and form a skeletal structure.

Metals

Recovery- The collection of used metal for reuse. ________ are infinitely recyclable and recycling them reduces the energy required to make new products.

Alloys

________ can harden a metal by disrupting its structure with differently sized atoms and not allowing grains to slide past each other as easily.

Characteristics

________- Hard, brittle, transparent, high compressive strength, high tensile strength, thermal insulator.

Glass

Biodegradeable- Breaks down easily and is not harmful to the environment. ________ is green in that its use and reuse helps the environment by using less raw materials.

Grains

________- dendritic structures, meet at surfaces called the grain boundary.

Creep

________- Gradual extension of a material under constant force, creep accelerates at higher temperatures.

plastic layers

The ________ can absorb more energy because they are flexible, so the glass is stronger.

Soda Glass

________- Poor glass in general, poor resistance to thermal shock.

Alloys

________- A mixture of a metal and another metal or a metal and a non- metal.