Lecture 1. Material Properties 1. Background
3 3. Properties of materials We shall concern ourselves with three types of issues: (a) Mechanical properties of materials (strength, toughness, hardness, ductility, elasticity, fatigue and creep). (b) Physical properties (density, specific heat, melting and boiling point, thermal expansion and conductivity, electrical and magnetic properties)
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Lecture 9. Surface Treatment, Coating, Cleaning
ieda.ust.hkA simple example of this process is copper plating using CuSO4 solution, using Copper anodes. Figure 3. Copper plating 9.6. Electroless plating In this case, the plating is achieved by a purely chemical reaction in the solution that causes the metal to be deposited. This process can be used to plate non-conducting parts with a layer of metal.
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ieda.ust.hkFriability means that the abrasive particles are brittle, and fracture after some amount of use, creating new sharp edges that will again perform more abrasion. Abrasive tools Figure 9 shows several types of abrasive tools. They all contain abrasive grains that are glued together using
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ieda.ust.hkeither of the mold halves. Such regions must be created by means of extra moving parts in the mold. Figure 13 below shows a cup-shaped part with a through-hole. One method to mold this part is by the use of a core. The figure below shows the steps of the mold opening. Figure 14(a) shows a more complex mold with four side action cams.
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