Q:What's the difference between crucible furnace and non crucible furnace in die casting industry?

From the way of heating, the crucible furnace has gas, fuel, electricity, coal, coke and so on. The life of the furnace crucible depends on the material.

Q:How do you prevent graphite crucibles from erosion during use?

Graphite crucibles can be prevented from erosion during use by following a few key measures: 1. Proper Preconditioning: Before using a new graphite crucible, it is important to precondition it by gradually heating it to high temperatures and gradually cooling it down. This process helps to remove any impurities from the surface and increases its resistance to erosion. 2. Appropriate Handling: Graphite crucibles should be handled with care to avoid any physical damage that could lead to erosion. Avoid dropping or banging them against hard surfaces, and use proper tools when handling them. 3. Controlled Heating and Cooling: Rapid and extreme temperature changes can cause thermal shock and accelerate erosion. It is essential to heat and cool the crucible gradually and uniformly, avoiding sudden temperature fluctuations. 4. Proper Flux Selection: The type and quality of flux used can greatly influence crucible erosion. It is important to select a flux that is compatible with graphite and has a low corrosive effect. Regularly checking and maintaining the flux composition is essential to prevent erosion. 5. Regular Cleaning and Maintenance: After each use, graphite crucibles should be thoroughly cleaned to remove any residue or impurities that could cause erosion. Using appropriate cleaning techniques and materials is crucial to prevent scratching or damaging the crucible. 6. Avoiding Contamination: Contamination from foreign materials can also contribute to erosion. It is important to ensure that only appropriate materials are used in the crucible, and that no foreign substances come into contact with it during use. By implementing these preventive measures, one can significantly reduce erosion and extend the lifespan of graphite crucibles, ensuring their optimal performance and cost-effectiveness.

Q:What is the white product in the crucible?

What is the white product in the crucible?

Q:Are graphite crucibles suitable for melting composite propellants?

Yes, graphite crucibles are suitable for melting composite propellants. Graphite is known for its high melting point, excellent thermal conductivity, and resistance to chemical reactions, making it an ideal material for containing and heating composite propellants during the melting process.

Q:Can a graphite crucible be used for metal powder sintering?

Yes, a graphite crucible can be used for metal powder sintering. Graphite is a commonly used material for high-temperature applications, and it has excellent thermal conductivity and stability, making it suitable for sintering processes. Additionally, graphite crucibles can withstand the extreme heat required for sintering without reacting with most metals, allowing for efficient and reliable sintering of metal powders.

Q:Can graphite crucibles be used for precious metal refining?

Yes, graphite crucibles can be used for precious metal refining. Graphite crucibles are often preferred in the refining process due to their high melting point, excellent thermal conductivity, and resistance to chemical corrosion. They are commonly used for melting and holding precious metals such as gold, silver, platinum, and palladium. The high temperature resistance of graphite ensures that it can withstand the extreme heat required for the refining process, while its thermal conductivity allows for efficient and uniform heat distribution. Additionally, graphite crucibles are chemically inert, meaning they do not react with the precious metals being refined, ensuring the purity of the final product. Overall, graphite crucibles are a reliable and effective tool for precious metal refining.

Q:How does the surface tension of graphite affect crucible performance?

The surface tension of graphite plays a crucial role in the performance of a crucible. Graphite has a relatively low surface tension, which allows it to easily wet and adhere to the inner surface of the crucible. This strong adhesion prevents the graphite from peeling or cracking under the extreme temperatures and thermal shocks experienced during the melting or casting process. Additionally, the low surface tension of graphite promotes efficient heat transfer between the crucible and the material being melted, ensuring uniform heating and reducing the risk of hot spots or thermal gradients. Overall, the surface tension of graphite greatly influences the durability and thermal efficiency of a crucible, making it an essential factor in its performance.

Q:How does the hardness of graphite affect the performance of a crucible?

The performance of a crucible is significantly influenced by the hardness of graphite. Crucibles commonly employ graphite as it possesses a high melting point, chemical inertness, and thermal conductivity. Nevertheless, the durability and longevity of the graphite utilized can be greatly affected by its hardness. Graphite with greater hardness exhibits enhanced resistance to wear and tear, thereby reducing the likelihood of cracking or breaking under high temperatures or repeated use. This durability is critical in preserving the structural integrity of the crucible, as any damage can lead to contamination of the processed material or compromised containment of molten substances. Furthermore, a harder graphite crucible can effectively withstand thermal shocks. The heating and cooling cycles cause the crucible walls to experience thermal expansion and contraction, which can induce stress. A harder graphite material is less prone to significant dimensional changes, thereby minimizing the risk of cracking or warping due to thermal stress. Additionally, the hardness of graphite affects its ability to resist chemical attack. Although graphite is generally chemically inert, it can still be susceptible to certain chemicals or corrosive environments. A harder graphite material typically exhibits greater resistance to chemical reactions, providing superior protection against erosion or degradation caused by the processed material. Overall, the hardness of graphite directly impacts the crucible's performance by influencing its durability, resistance to thermal shocks, and ability to resist chemical attack. It is crucial to select a graphite material with suitable hardness to ensure optimal performance and longevity in various high-temperature applications.

Q:How does a graphite crucible handle corrosive substances?

A graphite crucible is highly resistant to corrosion when handling corrosive substances. Graphite is known for its exceptional chemical stability, making it an ideal material for handling such substances. Its unique structure and bonding properties make it resistant to attack from acids, alkalis, and other corrosive agents. Graphite has a high melting point, low coefficient of thermal expansion, and excellent thermal conductivity, which allows it to withstand extreme temperatures and rapid temperature changes without cracking or deforming. This makes it suitable for use in various industries, including metallurgy, foundries, and laboratories, where corrosive substances are frequently encountered. Furthermore, graphite has a non-wetting property, meaning it does not react with molten metals or other corrosive materials. This non-reactivity prevents any contamination or chemical reaction between the crucible and the corrosive substances it contains. As a result, the graphite crucible maintains its integrity and does not compromise the quality or purity of the substances it is handling. In summary, a graphite crucible is an excellent choice for handling corrosive substances due to its exceptional chemical stability, resistance to corrosion, high melting point, thermal conductivity, and non-wetting property. Its ability to withstand harsh conditions and maintain its structural integrity makes it a reliable and durable option in various applications where corrosive substances are involved.

Q:Why graphite and diamond is composed of carbon graphite, but not light, is black, and the diamond is urgently in light!

Simply speaking, the structure is different, so the nature of the expression is different