The silicon carbide crucible is a bowl shaped container with a deep ceramic bottom. When solid is heated by fire, crucible must be used, because it can withstand high temperature more than glassware. This is also the reason why the silicon carbide crucible is used by the public. First of all, the use of the silicon carbide crucible is introduced, hoping to help everyone.

　　The crucible usually does not fill the melt too much to prevent the heat from jumping out and allowing the air to pass in and out freely to allow for possible oxidation. Because the bottom of the crucible is very small, it is usually needed to be heated directly by the fire on the mud triangle. The crucible can be placed on the iron tripod by either positive or oblique, and can be set up according to the requirements of the experiment. The crucible must not be placed on the cold metal table immediately after heating so as to avoid its rupture due to rapid cooling. You can't put it on the wooden table immediately to avoid burning the desk or causing fire. The correct method is to cool the holder on the iron tripod or to cool it on the asbestos net.

　　In some solid in high temperature processing, we need to use the crucible, because compared to ordinary glass crucible can withstand higher temperatures, here mainly recommended silicon carbide crucible, following on from the North carbon graphite products manufacturers to introduce the industrial value of silicon carbide crucible.

　　As the name suggests, the main raw material of silicon carbide crucible is silicon carbide, and the main characteristic of SiC crucible is due to silicon carbide. SiC is also called emery, chemical formula is SiC, it is made of quartz sand, petroleum coke (or coal tar), sawdust and other raw materials through the resistance furnace high temperature smelting materials. SiC content in silicon carbide is about 95% of the black silicon carbide has a strong toughness, high temperature characteristics, silicon carbide crucible is made of the black silicon carbide, silicon carbide crucible at high temperature in the process of using low thermal expansion coefficient, for rapid heating and cooling has good anti strain performance, good to have pH the corrosion resistance is a good chemical stability of the products. Silicon carbide crucible has good performance in metallurgical, mechanical, chemical and other industrial sectors depending on its good performance.

　　The performance of the silicon carbide crucible is good. It has good performance in metal smelting and alloy smelting, and has excellent technical and economic results in industry.

　　Beijing Great Wall Co., Ltd is dedicating on crucible over decade and hope to supply the best to our dear clients.

　　Quartz crucible, with high purity, strong heat resistance, large size high precision, good heat insulation, energy saving, stable quality and other advantages, more and more widely used. The inspection of the quartz crucible is a very important step, and the detection of the quartz crucible is developing towards the field!

　　1. quartz crucible can be used below 1450 degrees, divided into two kinds of transparent and opaque. The translucent quartz crucible fabricated by arc method is the basic material for drawing large diameter monocrystalline silicon and developing large-scale integrated circuits. Today, the world's semiconductor industry developed countries have replaced the small transparent quartz crucible with this crucible. He has high purity and strong heat resistance, large size high precision, good heat insulation, energy saving, stable quality etc..

　　2, can not touch the HF and, at high temperature, and carbonate was easily caustic and alkali metal.

　　3. quartz crucibles are suitable for melting samples with K2S2O7, KHSO4 as flux, and using Na2S207 (first drying at 212 degrees) to treat samples with flux.

　　4. quartz brittle, easy to break, use should pay attention to.

　　5. except HF,

　　Quartz glass crucible

　　Common dilute inorganic acids can be used as cleaning solutions. Quartz crucibles used for drawing monocrystalline silicon in China are 18 inches and 20 inches 22 inches. There are also 22 or more crucibles used by manufacturers. At present, the crucible technology produced by large crucible manufacturers in China is quite mature. Its production and use of raw materials, quartz sand imported by the United States and Norway high purity quartz sand two. There are also small factories using homemade materials. The quartz crucibles produced by their raw materials have certain influence on the stability of the drawn monocrystalline silicon.

　　The current production of crucible coating technique has been used by most manufacturers is in ordinary quartz sand solution for crucible surface coated with a layer of two barium oxide solution so as to form a dense layer, the dense layer can prevent the silicon and silicon high temperature quartz crucible drawing process to improve reaction rate.

　　Use and maintenance of quartz crucibles

　　1. The main chemical composition of quartz crucible is silicon dioxide, except hydrofluoric acid and other acids, easy and caustic and alkali carbonate.

　　2. The quartz crucible has a good thermal stability and can be heated directly on the flame

　　3. Quartz crucibles, like glassware, are easy to break and use with great care

　　4. Using quartz crucible with potassium bisulfate (sodium), sodium thiosulfate (at 212 degrees Celsius for drying) such as flux, melting temperature will not exceed 800 degrees celsius.

　　Silicon carbide graphite crucible, isostatic molding technology, long life, is 4 times the ordinary crucible. Chemical resistance, strong oxidation resistance, thermal conductivity, thermal shock stability! bowl shaped container with a ceramic crucible. When a solid is heated by a fire, it is necessary to use a crucible. Because it is more able to withstand high temperatures than glassware.

　　When the crucible is used, it is usually not too full to prevent the heat from jumping out and allowing the air to move in and out for possible oxidation. Crucible because of its small bottom, generally need to stand on the mud triangle in order to direct heating fire. The crucible is placed on the iron tripod with a positive or oblique position, and the requirements of the experiment can be arranged on the self. The crucible should not be placed immediately on the cold metal table after heating, so as to prevent it from cracking due to sharp cooling. Do not immediately put on the wooden table, in order to avoid burning the desktop or cause a fire. The correct way is to keep the iron triangle on the natural cooling, or put on the asbestos network to make it cool.

　　The crucible can be divided into three categories: graphite crucible, clay crucible and metal crucible. In the graphite crucible, there are three kinds of common graphite crucible, special graphite crucible and high pure graphite crucible. Because of the surface treatment process, can be divided into ordinary graphite crucible, graphite crucible coatings (in graphite crucible with a layer of graphite crucible coating way), graphite crucible of various types, due to performance, and the use of different conditions, the raw material used, production method, technology and product specifications are the difference.

　　The main raw material of the graphite crucible is crystalline natural graphite. So it keeps the original physical and chemical properties of natural graphite.

　　That is, good thermal conductivity and high temperature resistance, high temperature in the use of the process, the coefficient of thermal expansion is small, for the heat, the cold has a certain strain resistance. The acid and alkaline solution has good corrosion resistance and excellent chemical stability.

　　The crucible has many types and specifications, and is not limited by the scale of production, the size of the batch and the variety of the smelting material in application, and the utility model has the advantages of arbitrary selection, strong applicability and high purity.

　　The graphite crucible has been widely used in metallurgy, casting, machinery, chemical industry and so on. It has been widely used in the smelting of alloy tool steel and smelting of nonferrous metals and alloys. And has a good technical and economic effect.

　　Quartz crucible, with high purity and strong heat resistance, large size, high precision, good heat preservation, energy saving, stable quality and other advantages, is applied more and more widely. Detection of the quartz crucible is a very important link, and the detection of the quartz crucible toward the direction of the development of field detection

　　1 Quartz crucible can be used in the 1450 degrees below, divided into two kinds of transparent and opaque. With arc discharge method, translucent quartz crucible is pulling large diameter single crystal silicon, the development of large scale integrated circuit essential base material. Today, the world semiconductor industry in developed countries has used this crucible instead of small transparent quartz crucible. He has high purity and strong heat resistance, large size high precision, good heat insulation, energy saving, stable quality etc..

　　2, Cannot touch the HF and, at high temperature, and carbonate was easily caustic and alkali metal.

　　3 Quartz crucibles suitable for use K2S2O7, KHSO4 and Na2S207 as flux melted samples (first drying at 212 degrees) as flux sample.

　　4 Quartz brittle, easily broken, use caution.

　　5 Except HF,

　　Ordinary dilute inorganic acid can be used as a cleaning fluid. The common drawing for single crystal silicon quartz crucible 18 inch and 20 inch 22 inch has 22 or more of the manufacturers use crucible. The productions of domestic production of large crucible crucible technology manufacturers currently are relatively mature. The production of raw materials using quartz sand imported from the United States and Norway high pure quartz sand two. There are also small factory using quartz crucible domestic materials production of raw materials for the drawing of single crystal silicon and its stability are affected.

　　The crucible production coating technology has been most manufacturers use is ordinary quartz sand in the dissolution of the crucible surface coated with a layer of barium peroxide solution to form a dense layer and the dense layer can prevent silicon high temperature drawing process of silicon and quartz crucible reaction crystal forming rate is improved.

　　Beijing Great Wall Co., ltd is a leading company of graphite product. We always offer the best quality and the competitive price for our customer. We are looking forward to your enquiry and cooperation in the future.

　　Graphite crucible has a very wide range of application in the metallurgical industry. It is used for containing various liquid metal, as a manufacturer of metallurgy, we should know how to use graphite crucible, otherwise there will be some problems in the latter part of the production and application. Here we will introduce the matters which we should pay attention to:

　　1).Although the quality of graphite crucible is very good, not easy to damage, but we should handle it with care . The impact of falling from high altitude or bumps on the quality is not very big, but it will has crevice and even be broken for a long time so go on. We can’t give any remedy once the situation appear and can only change another one.

　　2).The graphite crucible is easier to damp, damp will make it become soft, it will be deformed when it is striked by some impprocedure items. And once the water goes into the inside of graphite crucible, it will influence the raw materials contained by it and dilute the raw material and maybe even some chemical reactions will happen and affect its quality, waterproof measures must be done well.

　　3).We can’t use the graphite crucible in the environment of sudden cold or sudden hot , it is easy to make its internal structure deformation, thus affecting its overall usage. Especially we should put it in the warm insulation to store it in the winter , do not put it in the cold outdoors, even we don't have a place to put it , we should use it ater its temperature become consistent with the ambient consistent.

　　4).We can’t heat in the the graphite crucible above the naked light. Because its thermal conductivity is not special enough, heating by the naked light has no meaning, and smoke and fire roasted will make it blackened, it isn’t beautiful.

　　5).We should pay attention to the distance between it wit the fire when we use the graphite crucible, this distance should be maintained at about 0.5 meters, there will be some problems if less than this distance.

　　6).The liquid inside graphite crucible should be poured out when it’s not in use , we wipe it up and then storage. It can cause corrosion phenomenon if there are other residual liquid in it, we can’t see much change in the short term , you will see the problem during the long-term observation .

　　Overall, the main component raw material of graphite crucible is graphite, it has all the properties of graphite, we hope we can use it with the correct , scientific and reasonable attitude.The use of graphite crucible is a very meticulous work, we need care and patience.

　　The crucible is a bowl shaped container with a deep bottom. The general graphite crucible can not guarantee the safety in the high temperature environment, and the conductive speed is slow so that it is not conducive to the experiment. When a solid is heated by a fire, it is necessary to use a graphite crucible. Because it is more able to withstand high temperatures than glass vessel, the current silicon carbide crucible is widely used.

　　We don’t put too full the melting stuff in the silicon carbide crucible usually when it is used so as to prevent the heat from jumping out and let the air be free to get in and out for possible oxidation reaction. Because the bottom of the crucible is very small, generally it need to be in the mud triangle in order to heat by the fire directly. The crucible is placed on the iron triangle frame with a positive discharge or an inclined release, and the demand of the experiment can be arranged on the self. it shall not be placed on a cold metal table immediately after the crucible is heated to prevent it from cracking due to sharp cooling. It also can not be placed on the wooden desktop immediately in order to avoid hot to the desktop or cause a fire. The correct approach to the iron tripod on the natural cooling, or placed on the asbestos network to make it slowly cooling.

　　How to choose a good quality silicon carbide crucible?It has a high temperature resistance because silicon carbide crucible is mainly used for melting metal, so the correct selection of a silicon carbide crucible is particularly important. With the naked eye to check the appearance of silicon carbide crucible to see if there are cracks carefully and if there is a clear rift on it so as to avoid unnecessary damage in the work. We also can use caliper to measure the smoothness of a crucible, and the digital Standard Specification for a lot of difference, should be careful to buy. The good silicon carbide crucible can not only accelerate the work efficiency, but also can save consumption, will not cause unnecessary waste.

　　Our silicon carbide crucible using the international latest technology of isostatic pressing method and strict quality assurance testing system, we select high quality refractory raw materials, high-tech formula and developed a new generation of high quality silicon carbide crucible . It has the product volume density, high temperature resistant, fast heat, acid and alkali resistant erosion, high temperature strength and antioxidant characteristics of higher performance, the service life is three times the clay graphite crucible.