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Unformatted text preview: dopants. Assume the activation energy for diffusion of Sb in silicon is 380 kJ/mole and D for Sb diffusion is 1.310-3 m 2 /s. 5-33 We can successfully perform a carburizing heat treatment at 1200C in 1 h. In an effort to reduce the cost of the brick lining in our furnace, we propose to reduce the carburizing temperature to 950C. What time will be required to give us a similar carburizing treatment ? 5-36 A ceramic part made of MgO is sintered successfully at 1700C in 90 minutes. To minimize thermal stresses during the process, we plan to reduce the temperature to 1500C. Which will limit the rate at which sintering can be done: diffusion of magnesium ions or diffusion of oxygen ions? What time will be required at lower temperature?...
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- Spring '09