Studies Concerning Energetic Consumption of Some Heating Equipments with Resistors
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In order to increase the resistance of aluminium alloys a complex heat treatment is usually performed. Therefore, we must consider the reaction time between aluminium alloys and furnace atmosphera. These atmospheres contain oxygene and nytrogene. Aluminium is an active element, therefore the oxidation is a very fast one.From the experiments made, the oxidation kinetics of aluminum alloys proves to depend on many factors, such as: temperature, alloy activity, chemical saturation and partial pressure of oxygen in gaseous phase. For a heat treatment process, the oxidation time became heating time. The furnace design provides to minimize the losses by untights and to realise a uniform air stream in the furnace chamber. These facts are going to minimise the oxide layer of the treated parts. For the studied furnaces, used at aluminum alloys heat treating, the functioning curves were first made. It must be mentioned that all experiments were made in different days, in order to assure the same pre-heating conditions for the equipment. As a conclusion, studying the heat chamber geometry is a step forward to a new concept of heat treatment furnaces. This idea leads to important economical effects, on a long term, for a constant development of the industry.
- 2007 fascicula9 nr2