Edexcel AS Engineering Unit 1 - Materials - Flashcards in A Level and IB Design & Technology

1. Heat treatment that reverses internal stresses associated with work hardening. Heat material until crystals glow, making it softer and more ductile. Must be maintained until material soaks, cooled slowly. (9)
6. Heat treatment that follows hardening of medium and high carbon steels. If left without tempering, the product will be brittle. Reduces amount of brittleness caused by hardening. Structure of materials 'relaxes' (9)
7. Work by transmitting light as a series of pulses. Significantly greater quantities of data can be transmitted using copper wires, each glass fibre in a cable can carry data. (7, 6)

2. Ceramic material that is often subject to further treatment and must be shaped. (9)
3. Glass containing boron and used generally for kitchen wear and lab equipment, due to its heat and chemical resistance. (4, 8, 5)
4. All rotationally moulded products are hollow, have no sprues however moulded halves must be joined together. Embossing can also be included. (10, 8)
5. Tubing is applied over electrical connections and held in place. Heat is applied and the tubing shrinks, permanently covering the connection, ensuring safety. (4, 6)
6. Products are made from sheet materials. Stretching occurs making the sides thinner than the base. No sprue marks but marks where product has been removed from sheet. Thermoformed products contain more detail. (13)
9. Heat treatment where crystal structure is allowed to become uniform, the crystals become a similar size. Heating a piece of work to a temperature where the crystal structure begins to change. Temperature is maintained until all crystals refined. (11)
10. Heat treatment changes the way the carbon within the steel affects the strength and hardness of the material. Medium carbon steel is heated to a specific temperature, the carbon moves out of its normal position. If quenched, carbon doesn't move back (9)

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