Metals
Gbogbo ọrọ náà
Metals give us the strongest, most enduring everyday objects: the steel in a car body, the aluminium in a drinks can, the copper in the wiring behind your wall. What makes metals special is a combination of strength, ductility and the ability to conduct heat and electricity, plus a property that polymers and timbers lack - the structure of a metal can be changed by force or heat to make it harder, tougher or softer to suit the job.
This note covers the 0445 Materials-option metals objectives: classifying metals and their stock forms, properties, environmental impact and uses; the ferrous metals and alloys (cast iron, mild steel, stainless steel, high-speed steel and the carbon steels); the non-ferrous metals and alloys (aluminium, copper, lead, tin, zinc, brass, duralumin, pewter); and how work hardening and heat treatments change the molecular structure to alter properties.
Ebumnobi
- demonstrate knowledge of metals and understand their classification, stock forms, properties, environmental impact and uses
- demonstrate knowledge of ferrous metals and alloys, for example: - cast iron - mild steel - stainless steel - high-speed steel (HSS) and carbon steels
- demonstrate knowledge of non-ferrous metals and alloys, for example: - aluminium - copper - lead - tin - zinc - brass - duralumin - pewter
- understand how work hardening and heat treatments can affect the properties of metals by changing the molecular structure.
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Metals. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which of the following is a ferrous metal? A. Copper B. Aluminium C. Mild steel D. Brass Answer: C
- Brass is an alloy of which two metals? A. Iron and carbon B. Copper and zinc C. Aluminium and copper D. Tin and lead Answer: B
- Which property makes high-speed steel (HSS) suitable for drill bits and cutting tools? A. It is the cheapest steel available B. It is non-magnetic C. It keeps its hardness even at high cutting temperatures D. It cannot rust under any conditions Answer: C
- What is the effect of work hardening on a metal? A. It softens the metal and makes it more ductile B. It makes the metal harder and stronger but more brittle C. It melts the metal D. It has no effect on properties Answer: B
- Why is high-carbon steel tempered after it has been hardened? A. To make it even harder B. To remove some brittleness and increase toughness C. To make it rust-resistant D. To increase its carbon content Answer: B
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Metals? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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