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Anonymous User (2021-10-05)

In response to Jual Blog Zombie
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A vacuum furnace is a type of furnace that can heat materials, usually metals, to very high temperatures and carry out processes such as sintering, brazing, and heat treatment with high consistency and low contamination.

In this vacuum furnace, the product in the furnace is surrounded by a vacuum and the absence of air or other gases prevents heat transfer with the product by convection and eliminates sources of contamination.

CONSTRUCTION OUTLINE of vacuum furnace
The construction of a common cupola, described in the figure, is made of an upright steel cylinder, covered with refractory brick. Metal and coke raw materials are loaded from the filler door. Air is blown in through the tuyer, the coke burns and the metal melts.


The part from the filling door to the exit hole, is divided into several areas as mentioned below:

Preheat area: Is the part of the filling door to the place where the metal begins to melt. During descending in this area, the metal undergoes expansion heating
Melting region: is the upper part of the coke bed where the metal melts.
Further hot area: is the lower part of the melting area until the tuyer is flat.
Crust area: Is part of the tuyer to the base of the cupola. Molten metal and a small amount of slag are accommodated in this area.


The melting capacity of the cupola is expressed by the melting rate in units of weight per unit time, generally written tons per hour.


These conditions need to be considered, so that the effective height of a standard cupola is usually constructed to be between four and five times the inner diameter, measured from the center of the tuyer.


The crucible area is the area from the bottom of the tuyer to the base of the cupola. The crucible area of the cupola which has a faceplate is made shallow, because it is not used to store molten metal in it.

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