A pot in which metal is held,while melting in a furnace is called as a Crucible. It is made of siliconcarbide and clay graphite.
Shapes of crucibles: A bilge shaped crucible has the shape of a barrel. The part of thecrucible in the middle region is called as a bilge. This is the widest part ofthe crucible and has the maximum diameter. The top of the crucible has lesserdiameter than the bilge. The base of the crucible has lesser diameter than thetop. As per a thumb rule, the Injection Moulding for sale of a bilge crucible is the number of pounds ofaluminum that it would hold. For bronze and brass, thrice the # can be held.For instance, a #5 bilge crucible can hold almost 5 pounds of aluminum and 15pounds of brass. This thumb rule is applicable for bilge shape only.
An A shaped crucible has anarrow bottom and a wider top. There are straight sides that are bent outwards.The diameter continuously increases from the base to the top. As it is simplerto manufacture this shape than the bilge one, the A shaped crucible has alesser cost. When compared with the equivalent bilge style, the capacity of theA shaped crucible is lesser.
Both the # above mentioned shapescan be manufactured in Clay graphite and silicon carbide.
Properties of crucibles: A crucible must be able to bear the extremely hightemperatures of the molten metal. For this, the melting point of the materialused to create the crucible must be more than the melting point of the metalthat in placed in the crucible. Also, the crucible material must have excellentstrength even in the white hot state.
For melting metals like aluminumand zinc, a steel crucible made at home can be used. The reason is that themelting point of aluminum and steel is lesser than steel. In this case, theinterior surface of the steel crucible undergoes flaking or scaling. Due tothis scale, the molten metal is polluted. The thickness of the crucible wallsdecreases fast. Hence, a coating of marcote-7 is applied to the inner surfaceof the steel crucible. The use of steel crucibles is okay if the contaminationdue to the scales is not regarded serious.
Materials used: To construct a crucible, the usual refractory materials(i.e. carbon bonded silicon carbide and clay graphite) can survive theextremely high temperatures of work of a foundry. In addition, silicon carbideis a very durable material.
Some of the clay graphitecrucibles can be used up to 2750 degrees Fahrenheit. Some A shaped cruciblesare used up to 2000 degrees Fahrenheit. These crucibles can be used to handlegold, silver, bronze, brass, aluminum and zinc alloys.
The A shaped crucibles have arough surface finish and there are dents along the rims. However, thisroughness does not interfere with the performance by any means.
While handling crucibles,correctly fitting tongs must be used. In correct tongs can lead to damage ortotal failure of the crucible. In between the base of the furnace and thecrucible there must be a disk of cardboard or a coating of Plumbago.
https://www.nbyuchen.com/
Shapes of crucibles: A bilge shaped crucible has the shape of a barrel. The part of thecrucible in the middle region is called as a bilge. This is the widest part ofthe crucible and has the maximum diameter. The top of the crucible has lesserdiameter than the bilge. The base of the crucible has lesser diameter than thetop. As per a thumb rule, the Injection Moulding for sale of a bilge crucible is the number of pounds ofaluminum that it would hold. For bronze and brass, thrice the # can be held.For instance, a #5 bilge crucible can hold almost 5 pounds of aluminum and 15pounds of brass. This thumb rule is applicable for bilge shape only.
An A shaped crucible has anarrow bottom and a wider top. There are straight sides that are bent outwards.The diameter continuously increases from the base to the top. As it is simplerto manufacture this shape than the bilge one, the A shaped crucible has alesser cost. When compared with the equivalent bilge style, the capacity of theA shaped crucible is lesser.
Both the # above mentioned shapescan be manufactured in Clay graphite and silicon carbide.
Properties of crucibles: A crucible must be able to bear the extremely hightemperatures of the molten metal. For this, the melting point of the materialused to create the crucible must be more than the melting point of the metalthat in placed in the crucible. Also, the crucible material must have excellentstrength even in the white hot state.
For melting metals like aluminumand zinc, a steel crucible made at home can be used. The reason is that themelting point of aluminum and steel is lesser than steel. In this case, theinterior surface of the steel crucible undergoes flaking or scaling. Due tothis scale, the molten metal is polluted. The thickness of the crucible wallsdecreases fast. Hence, a coating of marcote-7 is applied to the inner surfaceof the steel crucible. The use of steel crucibles is okay if the contaminationdue to the scales is not regarded serious.
Materials used: To construct a crucible, the usual refractory materials(i.e. carbon bonded silicon carbide and clay graphite) can survive theextremely high temperatures of work of a foundry. In addition, silicon carbideis a very durable material.
Some of the clay graphitecrucibles can be used up to 2750 degrees Fahrenheit. Some A shaped cruciblesare used up to 2000 degrees Fahrenheit. These crucibles can be used to handlegold, silver, bronze, brass, aluminum and zinc alloys.
The A shaped crucibles have arough surface finish and there are dents along the rims. However, thisroughness does not interfere with the performance by any means.
While handling crucibles,correctly fitting tongs must be used. In correct tongs can lead to damage ortotal failure of the crucible. In between the base of the furnace and thecrucible there must be a disk of cardboard or a coating of Plumbago.
https://www.nbyuchen.com/
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