What is the melting of the crucible?

The crucible melting is usually a pot in the shape of a pot located in the center of the furnace, which is used to hold a metal to melt. It is usually made of silicon carbide and graphite, but can also be composed of metals suitable for high -temperature applications such as tantalum or tungsten. Krucibles can also be shaped in a conical or flat, plate form, depending on the application. Foundries usually use them to melt smaller amounts of metal or specialized alloys than a larger process of commercial foundry. Methods of heating the furnace, which contains one of the different types of cups, may be anything from natural gas or propane to use of oil, coke or induction electricity.

The shape of the crucible melting is referred to as bearous for cylindrical shape and shape and for conical shapes, while the cups are cheaper because they are easier to produce. The three -melting cup also determines the level of temperature. King of carbide silicon can withstand temperatures up to 2,750 ° Fahrenheita (1,510 °C). As a result, they are suitable for handling all soft metals such as gold, silver and aluminum, as well as alloys such as brass, which is mostly composed of zinc and copper.

Iron and iron alloys are usually not processed by melting the crucible furnace, because the melting point of iron is very high. The standard structure of a crucible of silicon carbide would disintegrate and contaminate the metal sample because iron messes at 2,800 ° Fahrenheit (1,538 ° C). The key cup with graphite mixture, such as silicon carbide models, is also not used for melting iron, as graphite dissolves and reacts with iron, changes its content and slowly wears on the crucible structure. Specialized cups made of molybdenum metal can withstand very high temperatures, 4,712 ° Fahrenheit (2,600 ° C) and can be used to melt iron.

Furnaces

that use a cup of melting are marked in the way the solution isAvicated metal removed from the crucible. The residential furnace has a crucible where the molten metal improves, while the tilting furnace has a cup that is tilted for pouring metal. The elevator furnaces are designed to remove the entire crucible structure and molten metal loaded or poured out.

Aluminum composition is also common for cups, as they can be inert under a wide range of metal chemistry. However, they work best with neutral acid levels for melt materials. The joints of magnesium are more suitable for basic compounds of melt and zircons of zirconium-silics for highly acidic compounds.

Krucible is also subject to tension when they are repeatedly heated and cooled. This is known as the thermal shock, and some metal compounds for cups can do better than others. Applied temperature, chemical composition of what is melted, and the amount of prolonged use that experiences a cup of melting