High-Purity MgO Boat Cover, Inner Convex, 2200°C High Temperature Resistance
Price range: $7.50 through $25.00
- The Magnesium Oxide Lids for crucibles, made from high-purity (≥99.3%) capacitor-grade MgO, is white. It operates stably at: 1900°C in air (oxidizing conditions), and 2000°C under nitrogen/vacuum, with a peak tolerance of 2200°C.
- It is suitable for various high-temperature experimental applications. It is designed for laboratory use and industrial analysis.
- The heating or cooling rate should be moderate and maintained at less than 4°C per minute, with particular attention required for large crucibles.
Characteristics and Advantages of Magnesium Oxide Crucibles
- High-temperature resistance:
Withstands temperatures up to 2200°C. As temperature. As temperature increases, resistivity decreases, making it a typical alkaline refractory material.
- Acid and alkali resistance:
corrosion resistance: Exhibits excellent chemical performance and stability against metal erosion.
- Ideal for metal smelting:
Operates stably at high temperatures, serving as a container for electric furnaces in metal smelting.
- Superior insulation properties:
Functions as an antistatic material.
Precautions for Using 99% Magnesium Oxide Crucibles
MgO and SiO2 react at high temperatures to form MgSiO3. Please use caution when melting materials containing silicon dioxide.
Before the first use, the crucible should be placed in an oven at approximately 105°C for 120 minutes to remove moisture.
Do not use gasoline torches, acetylene torches, or alcohol lamps for direct heating to avoid cracking of the crucible due to uneven heating.
- The distance between the crucible and the heating element (such as carbon tubes, silicon carbide rods, heating wires, etc.) should be greater than 2 cm.
4. The rate of heating or cooling should not be too rapid. Below 1200°C, the rate should be less than 5°C per minute; above 1200°C, it should be less than 4°C per minute. For cooling, it is recommended to use controlled power cooling. Directly turning off the power at high temperatures may cause rapid initial cooling, potentially leading to cracking.
5. For large crucibles, it is advisable to avoid direct contact between the bottom of the crucible and the furnace floor. Use high-temperature resistant materials such as corundum plates to elevate the crucible, promoting air convection and extending the crucible's lifespan (as shown at right).
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