Alumina Crucibles
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Cost-effective crucibles for applications up to 1700°C in vacuum or oxidizing atmospheres. Hydraulically pressed for consistent dimensional control and uniform surface finish.
Product Applications
Investment CastingPowder Metallurgy Metal Injection MoldingSteel Making
While many suppliers offer basic alumina crucibles as simple one-shot liners, Zircoa combines cost-effective alumina material with our premium manufacturing processes and quality management systems. Our Composition 6105 alumina crucibles are hydraulically pressed for precise dimensions and feature uniform, smooth inner surfaces that deliver cleaner melts and extended service life up to 1700°C.
Alumina crucibles serve two primary functions. On their own, they serve as a melt container for use with induction furnaces in traditional grouted-coil installations. Additionally, our alumina crucibles are ideally suited as backup crucibles in two-crucible installations combined with zirconia crucibles. The sizes are matched between crucible types for safe installation with maximum energy efficiency.
Learn more about the differences achieved with a Zircoa alumina crucible below, or connect with our team to consult about project specifics.
Explore a Better Alumina Crucible
- Hydraulically pressed for precise, consistent dimensions
- Uniform and smooth inner surface for cleaner melt quality
- Extended service life compared to standard alumina crucibles
- Cost-effective performance for applications up to 1700°C
- Compatible sizing with zirconia crucibles for two-crucible systems
- Suitable for vacuum or oxidizing atmospheres
- Premium quality control with reliable, repeatable results
- Engineered for both primary and backup crucible applications
Primary Industries
- Investment casting operations
- Powder metallurgy and metal injection molding
- Steel industry and specialty alloy production
Key Applications
- Variety of metals and alloys with service temperatures up to 1700°C
- Cost-sensitive melting operations requiring reliable performance
- Applications where zirconia performance isn’t required
- Backup crucible systems for enhanced safety and efficiency
Alumina Crucible Selection and Specifications
Interactive Selection Tools
Use our online tools or connect with our experts to select the optimal alumina crucible based on:
- Bottom shape configuration (round bottom vs. flat bottom)
- Proper dimensions with backup material clearances
- Two-crucible system compatibility with zirconia crucibles
Typical Properties
| Composition | 6105 |
|---|---|
| Typical Chemistry | |
| SiO2 (wt.%) | 3.0 |
| CaO (wt.%) | 0.1 |
| MgO (wt.%) | 0.1 |
| Fe2O3 (wt.%) | 0.2 |
| TiO2 (wt.%) | 0.1 |
| ZrO2 (wt.%) | 2.0 |
| Al2O3 (wt.%) | balance |
| Typical Physical Properties | |
| Density (g/cm3) | 2.8 |
| Porosity (%) | 18 |
Optimize Performance with Two-Crucible Systems
Zircoa’s matched sizing between alumina and zirconia crucibles enables safe two-crucible installations that maximize energy efficiency while providing backup protection. Our 1859 or 1860 Backup Material is ideal for placement between alumina and zirconia crucibles, providing superior insulation with five times the thermal efficiency of standard materials. Additionally, the grain size distribution is optimized for sturdy support on the crucible bottom, good compaction on the sides, and stability even after several thermal cycles.
Options include:
- Backup 1859 — Grog, partially stabilized with magnesia and calcia
-8 +100 Tyler mesh size - Backup 1860 — Grog, partially stabilized with magnesia and calcia
-8 +28 Tyler mesh size
Alumina Crucibles Related Case Studies
There are currently no case studies available for this product.
Contact a specialist
USA & Worldwide
Ronny Simon
+1-216-440-2283
Europe, the Middle East, Africa & India
Tobias Schmidt
+49-170-3212233
