Graphite Casting Crucible and Ceramic Shield for Gold Silver Jewelry Casting Machine

Custom Graphite Casting Crucible and Ceramic Shield for Gold Silver Jewelry Casting Machine

Sometimes Ceramic shield is called quartz crucible. 

In general, the inspection work of graphite crucible before use should mainly do the following:

1. First, check the graphite crucible for cracks before work. If there is no crack, the graphite crucible should be heated to 600 ° C or more and fully dried.

2. There should be no water around the furnace and in the pit in front of the furnace, and irrelevant objects should not be stacked near the graphite crucible.

3. Strictly inspect the furnace charge for explosives. The furnace charge must be preheated and dry, and the graphite crucible must be slow.

Before using the graphite crucible, be sure to do the above points, otherwise it is very likely to cause the graphite crucible to explode during use.

The main purpose of the graphite crucible is to heat the experimental material that needs to be heated. Generally, the graphite crucible is used to heat the solid material in the experiment. The graphite crucible has a variety of models. The crucible can be selected according to the number and type of materials to be heated and the degree of thermal expansion. model. In general, when using graphite crucibles, we must pay attention not to fill the crucible with heated materials, which is very dangerous, not only easily cause experimental accidents, but also have a great impact on the life of the graphite crucible. In addition, it should be noted that under normal circumstances the crucible must be heated to four or five Baidu, at this time must not place graphite crucible or touch the graphite crucible by hand, this is very dangerous.

1. The requirements for the fire resistance of graphite crucibles are very high. Therefore, we must require the fire resistance of the raw materials of graphite crucibles, so that the graphite crucibles can be used more safely;

2. We often use graphite crucibles in chemical smelting that is more corrosive, so the chemical stability of graphite crucibles is also very important, so that corrosion can be reduced;

3. The hardness and toughness of graphite crucible are also factors we need to consider, to avoid brittle fracture of graphite crucible in use.

The above is the material selection method we should adopt when making graphite crucibles. Only by selecting materials according to the above standards, can graphite crucibles be able to give full play to its performance.

Why do we need to use graphite melting crucible and ceramic crucible together?

Crucible has good thermal conductivity and high temperature resistance, and is widely used in metallurgy, casting, machinery, chemical industry and other industrial sectors, especially in the metal smelting industry, mainly used for melting metal materials. The crucibles commonly used for smelting metals are graphite crucibles and quartz crucibles. What is the difference between these two crucibles? We can compare them in terms of their appearance, heat resistance, heating material method and use.

The color of quartz crucible and graphite crucible is different. The quartz crucible is a white cup and the graphite crucible is a black cup, which is very easy to distinguish.

Quartz crucibles are more resistant to high temperatures than graphite crucibles. The maximum temperature of the intermediate frequency melting furnace is 2600℃, which is matched with a quartz crucible; the maximum temperature of the high frequency melting furnace is 1600℃, and the matching is a graphite crucible.

The heating methods of the materials in the two crucibles are different. There is no resistance in quartz. When the medium-frequency current passes, it is the metal material in the quartz crucible that generates heat. The quartz crucible does not heat. It is suitable for smelting iron, aluminum, stainless steel, platinum, gold, palladium, etc.; there is resistance in graphite. When the frequency current passes, the graphite crucible heats the metal material by self-induction heating, which can smelt gold, silver, copper, alloy, K gold and so on.

The quartz crucible can be used alone, but the graphite crucible should be used with a quartz jacket because graphite will oxidize. The quality of the graphite crucible is related to its material and good density. A good graphite crucible is uniformly oxidized, and it is not easy to eat gold, so that the production loss is low. The uneven oxidation of the bad graphite will eat the material and cause high loss. When graphite is oxidized, it is easy to thin or even crack, so when using graphite crucible, it is necessary to put on the quartz crucible jacket, the quartz jacket plays a protective role.

Knowing the difference between ceramic crucible and graphite crucible, we can choose crucible better and more accurately when smelting metal.

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