Graphite crucible, as an important container in high-temperature heating environment, is widely used in metallurgy, casting, chemical industry and other fields. However, when faced with a wide variety of graphite crucibles on the market, customers often feel confused when choosing, especially when it comes to distinguishing between pure graphite machined crucibles and pressed integrated graphite crucibles. This article will elaborate on the differences between raw materials, processing technology, service life, product density, and size to help customers make informed choices.
1、 Raw materials
Pure graphite machining crucible: Made from raw materials such as asphalt coke and petroleum coke, it is produced through a series of complex processes including crushing, grinding, kneading, forming, roasting, graphitization, and purification. These processes ensure the high purity, high density, and excellent physical and chemical properties of graphite materials, making them ideal materials for manufacturing high-performance graphite crucibles.
Compression molding integrated graphite crucible: In addition to using natural flake graphite or artificial graphite, a certain proportion of binders such as asphalt, resin, etc. will also be added. These binders carbonize at high temperatures, bonding graphite particles together to form a dense overall structure.
2、 Processing technology
Pure graphite machining crucible: CNC machine tools are used for precision machining of high-purity and high-density graphite blocks, including turning, milling, drilling and other processes. This processing method can precisely control the size and shape of the crucible to meet the needs of different customers.
Compression molding integrated graphite crucible: Mix graphite powder and binder evenly, and then press it into shape through a mold. The formed crucible needs to undergo high-temperature calcination to carbonize the binder, ultimately forming an integrated graphite crucible.
3、 Usage cycle
Pure graphite machining crucible: Due to the use of high-purity, high-density graphite material and precision processing, its structure is dense, with excellent thermal shock resistance and a long service life.
Compression molded integrated graphite crucible: Due to the addition of binders, its density and strength are relatively low, and its thermal shock resistance is slightly inferior, resulting in a relatively short service life.
4、 Product density
Pure graphite machining crucible: The density is relatively high, generally above 1.7g/cm3, and can even reach 1.9g/cm3. High density means superior thermal conductivity, electrical conductivity, and corrosion resistance.
Integrated graphite crucible for compression molding: The density is relatively low, generally around 1.5g/cm3. A lower density means that its mechanical strength and thermal shock resistance are relatively weak.
5、 Size
Pure graphite machining crucible: Due to the use of CNC machine tools, crucibles of various sizes and shapes can be produced to meet the needs of different customers.
Compression molding integrated graphite crucible: Due to the size and shape of the mold, its production size and shape are relatively limited, making it difficult to meet some special requirements.
6、 Summary
Pure graphite machining crucibles and integrated graphite crucibles formed by compression each have their own advantages and disadvantages. Customers should consider their own needs comprehensively when choosing.
If you need high-precision, high-performance, long-life graphite crucibles that are not sensitive to price, you can choose pure graphite machined crucibles.
If you need a graphite crucible with relatively low price, simple size and shape, and low requirements for service life, you can choose to press and form an integrated graphite crucible.
7、 Other precautions
In addition to the above points, customers should also consider the following factors when choosing graphite crucibles:
Working temperature: Graphite crucibles of different materials have different maximum working temperatures.
Corrosion resistance: Graphite crucibles made of different materials have varying resistance to acid and alkali corrosion.
Antioxidant properties: Graphite crucibles made of different materials have varying antioxidant properties.
It is recommended that customers consult professional graphite crucible manufacturers when choosing graphite crucibles, and choose the appropriate model and specifications according to their own needs. Or based on your own drawings and labeled with material selection and process requirements.
