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Presintering is an operation in which the powder metallurgy components after compaction are heated for a short time to a temperature considerably below the final sintering temperature. The purpose of the intermediate operation is to strengthen the green compact for handling and subsequent operations.
Presintering is necessary to produce parts from material such as tungsten carbide which become very hard on sintering. When machining is required to be done on such parts, the problem is alleviated by employing a presintering operation. The machined parts are then finally sintered. As there is very little dimensional change on final sintering, in most cases no further work is required to be done on these parts. If no machining is required presintering can be eliminated.
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Q. Describe the complete procedure of testing permeability of moulding sand. How is permeability influenced by various parameters of the moulding sand ? Ans. Permeability
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Abrasive Grit This method of compressor cleaning involves injecting an abrasive grit into the engine at selected power settings ( Figure 21.30.)grit used may be ground walnut s
Q. The Electricity generation in Florida is 224,750GWh/y. What is the annual generation per capita? Knowing the population of Florida, the electricity generation per capita is 1
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