The Origins of Democracy: A Model with Application to Ancient Greece
A method is disclosed for preparing a coated rotor housing useful in a rotary internal combustion engine. A first mandrel is defined from conductive material such as a chrome-bearing steel. The outer surface of the first mandrel is shaped to be the mirror image of the resultant internal surface of the rotor housing; the first mandrel material is passivated preferably by the use of boiling water to form a chrome oxide material on the outer surface to prevent adhesion of surrounding coated materials. A thin, composite-particle wear-resistant coating is electrolytically deposited on to the first mandrel to form an assembly. The wear-resistant coating is preferably comprised of nickel carrying embedded silicon carbide particles. The first mandrel is stripped from the deposited thin coating leaving a self-supporting liner or sleeve, the liner may be used in its unitary form or may be sliced into smaller liner bands for separate processing. The liner is placed about a brother mandrel (identical in shape to the first mandrel, but previously preheated by use in the die-cast machine) and together they are inserted into a die-cast machine. Molten aluminum is supplied to the machine for casting about said liner to define a complete housing construction, the liner offering high wear-resistance.