Detailed introduction of graphite crucible

Graphite crucible has good thermal conductivity and high temperature resistance. During high temperature use, the thermal expansion coefficient is small, and it has certain strain resistance to rapid heating and rapid cooling. It has strong corrosion resistance to acid and alkaline solutions, and has excellent chemical stability. In metallurgy, casting, machinery, chemical industry and other industrial sectors, it is widely used in the smelting of alloy tool steel and the smelting of non-ferrous metals and their alloys.

1. Characteristics of graphite crucible

1). The high density of graphite crucible makes the crucible have the best thermal conductivity, and its thermal conductivity is obviously better than other non-graphite crucibles;

2). The graphite crucible has a special glaze layer and dense molding material on the surface, which greatly improves the corrosion resistance of the product and prolongs its service life;

3). The graphite components in the graphite crucible are all natural graphite, and the thermal conductivity is very good. After the graphite crucible is heated, it should not be placed on a cold metal table immediately to avoid it breaking due to rapid cooling. Crucibles are best suited for the melting of many types of alloys in small quantities.

To change the type of alloy, just exchange the graphite crucible. Other melting methods, such as reverberatory furnaces and non-crucible induction furnaces, are suitable for mass melting of a single alloy. If the type of melting alloy is changed, metal contamination will occur if the refractory lining is not replaced.

2. Performance and application of graphite crucible

Graphite crucibles for combustion heating are mainly used for the smelting of non-ferrous metals such as copper, aluminum and alloys.

1). Low energy consumption. Due to the reasonable design, advanced structure and novel materials of graphite crucible, the energy consumption is lower than that of similar furnaces of the same model.

2). Less pollution, because clean energy such as natural gas or liquefied gas can be used as fuel, less pollution.

The resistance furnace high-purity graphite crucible is mainly used for the smelting of gold, silver and rare metals. Ceramic crucibles are mainly used in laboratories and smelting of platinum, gold and rare metals. Can the graphite crucible work at a high temperature of 2000 degrees under the condition of air, will it decompose and oxidize violently? Will it carburize molten metal? Most importantly, carburizing is fatal. Under normal circumstances, it can reach 2000 degrees in the air, but it will oxidize rapidly, and the problem of metal carburization must exist. Now there are special anti-carburization coatings on the market, and the use effect is not bad.

3. Maintenance of graphite crucible

1). The graphite crucible is strictly protected from moisture and must be stored in a dry place or on a wooden shelf.

2). When handling, handle with care, and it is strictly forbidden to shock.

3). Before use, it needs to be heated by drying equipment or furnace, and the temperature is gradually raised to 500 °C.

4). The crucible should be placed below the level of the furnace mouth to prevent the top of the crucible from being worn by the furnace cover.

5). When feeding, it should be based on the crucible's melt volume. Do not add too much material, and prevent the crucible from shrinking if it is too tight.

6). The furnace tool and crucible clip should conform to the shape of the crucible, and the middle part of the clip should prevent the crucible from being damaged by force.

7). When removing the molten slag and sticky coke on the inner and outer walls of the crucible, tap lightly to prevent damage to the crucible.

8). A suitable distance should be maintained between the crucible and the furnace wall, and the crucible should be placed in the center of the furnace.

9). The use of appropriate amount of accelerants and additives will reduce the service life of the crucible.

10). During the use process, turn the crucible once a week to prolong the service life of the crucible.

11). Prevent strong corrosive flames from directly spraying the sides and bottom of the crucible.