Customized Cylindrical MgO Cup Magnesia Ceramic Crucible for Gold Melting

MgO Material Core Characteristics

Magnesium Oxide (MgO) ceramic crucibles, manufactured from high-purity magnesium oxide powder via isostatic pressing and ultra-high temperature sintering processes, represent a premium product in the field of technical ceramics. Designed to withstand the most demanding thermal and chemical environments, they demonstrate irreplaceable value in melting highly reactive metals, growing single crystals, and conducting high-temperature chemical reactions. Their outstanding performance is rooted in the unique physical and chemical properties of the MgO material itself.

• Extremely High Melting Point and Thermal Stability

Magnesium oxide has a very high melting point of 2852°C, ranking among the highest of all oxide ceramics. This property enables MgO crucibles to operate stably at temperatures far exceeding the melting points of most metals and alloys, typically with a continuous service temperature above 2200°C. At such extreme temperatures, they do not soften, deform, or volatilize significantly, providing a robust and dimensionally stable container for high-temperature processes.

• Superior Alkaline Resistance and Chemical Inertness

As magnesium oxide is a basic oxide, it exhibits exceptional resistance to basic slags and substances. More importantly, it demonstrates remarkable chemical inertness towards many molten metals, particularly highly reactive ones like Titanium (Ti), Zirconium (Zr), Molybdenum (Mo), Yttrium (Y), and their alloys. It effectively prevents chemical reactions between the molten charge and the crucible wall, thereby avoiding contamination of the melt and ensuring the final product's purity.

• Excellent High-Temperature Electrical Insulation

Even at elevated temperatures, magnesium oxide maintains a very high volume resistivity, making it an excellent high-temperature electrical insulator. This characteristic makes it particularly suitable for applications involving electric current passage, such as vacuum induction melting and resistance heating melting, effectively preventing energy loss due to induced eddy currents or electrical short circuits, thus ensuring process safety and efficiency.

• Moderate Thermal Shock Resistance

Through control of raw material purity, particle size distribution, and sintering parameters, we can produce MgO ceramics with good thermal shock resistance. This means they can withstand a certain degree of thermal shock (i.e., rapid temperature changes), and while they may not perform as well as zirconia in this aspect, optimized formulations and designs meet the heating/cooling requirements of many industrial applications.

• High Thermal Conductivity and Low Heat Capacity

MgO ceramic offers good thermal conductivity, which facilitates rapid and uniform heat transfer through the crucible wall, reducing localized hot spots and promoting temperature homogeneity within the melt. Concurrently, its relatively low heat capacity means that heating and cooling cycles can be more efficient, contributing to energy and time savings.

Magnesium Oxide ceramic crucibles Advantages and Core Competitiveness

• Extended Service Life and Superior Cost-Effectiveness

Due to their exceptional resistance to high-temperature erosion and chemical corrosion, MgO crucibles offer a significantly longer service life compared to ordinary fireclay or graphite crucibles. They can endure multiple melting cycles without significant wall thinning or structural degradation, dramatically reducing consumable costs, equipment downtime, and replacement frequency in production processes, resulting in an excellent Total Cost of Ownership (TCO) in the long run.

• Outstanding Mechanical Strength and Structural Integrity

Our MgO crucibles retain high mechanical strength at elevated temperatures, enabling them to withstand the hydrostatic pressure of the molten metal and appropriate mechanical handling (e.g., gripping, transferring). Their strong resistance to creep prevents failure due to deformation or collapse during high-temperature use.

• Customization Services and Precision Manufacturing

We offer customization services to produce crucibles in various sizes and shapes according to specific client requirements, including standard cylinders, cones, and crucibles with lids.

MgO ceramic crucible Usage Guidelines and Precautions

To maximize the performance of your MgO ceramic crucible and ensure safety, please adhere to the following recommendations:

• Preheating Schedule: Strictly follow recommended heating and cooling cycles, especially during the first use or for large crucibles, to avoid thermal shock cracking.
• Environment Compatibility: While highly resistant to alkalis, avoid use in strongly acidic atmospheres or in direct contact with large quantities of acidic fluxes.
• Mechanical Handling: Despite high hot strength, ceramics are inherently brittle. Handle with care at room temperature, avoiding impacts.
• Dedicated Use: It is advisable to use dedicated crucibles for different types of metals or materials to prevent cross-contamination.

Why Choose Us

As your trusted advanced ceramic supplier, we commit to:

• Flexible Customization: With strong production capabilities, we can respond quickly to your drawings or requirements, offering personalized product solutions.
• Global Service: We are dedicated to providing timely, professional support and reliable logistics services to clients across various industries worldwide.

Technical specifications