Crucibles for melting high temperature alloys
Isostatically pressed in five materials, with alumina also vibro cast, matched to your alloy, furnace and melt size.
Crucible manufacturing, from mixing to final inspection
Talk to a Technical ExpertMixing
Refractory materials are automatically weighed, mixed and graded before pressing or casting, with every batch following a fixed mix design of optimum mineralogy and particle size.
Pressing & casting
Shapes are formed by isostatic pressing or vibro casting, producing a uniform, homogeneous refractory body with solid walls, low porosity and high density throughout.
Firing
Parts are fired in modern gas fired kilns under PLC temperature control, with uniform kiln temperatures to 1650°C and accurate, consistent heating and cooling cycles.
Inspection & quality assurance
Qualified inspectors check every part before firing and again before dispatch, with each part carrying a kiln batch number for complete traceability, backed by in-house testing.
Crucibles by material
Alumina Crucibles
The workhorse of the range. High purity alumina handles both air and vacuum induction melting, with the thermal shock resistance and smooth, non-wetting surface the investment caster relies on.
Super Zirconia Crucibles
Magnesia stabilised for the most demanding vacuum work. Low thermal expansion means one crucible survives pour after pour of superalloy, the reason aerospace casters specify it.
Lime Stabilised Zirconia Crucibles
Trusted with platinum group metals at up to 2200°C. Lime stabilisation prevents volume changes, so the body resists spalling and erosion through the severest heating cycles.
Chrome Alumina Crucibles
A small addition of chrome oxide gives the alumina body its resistance to slag attack, extending crucible life in the air melting commercial foundry.
Magnesia Crucibles
Lighter than zirconia and preferred by some customers for X-ray analysis. The magnesia body carries lower running costs than stabilised zirconia.
Crucibles by process
Isostatically Pressed Crucibles
Formed under uniform pressure for the densest, most consistent body in the range, from 0.5 to 370 kg.
Vibro Cast Crucibles
Cast and vibration-compacted in alumina for the largest capacities, up to 1,000 kg of steel.
Material selection guide
Talk to a Technical Expert| Material | Best suited to | Max service temperature | Capacity range, isostatically pressed |
|---|---|---|---|
| Air and vacuum melting in the investment casting foundry | 1800°C | 8 to 265 kg | |
| High end vacuum melting and aerospace alloys | 1900°C | 8 to 265 kg | |
| Platinum group metal melting refineries | 2200°C | 0.5 to 100 kg | |
| Air melting where slag resistance matters | 1800°C | 8 to 265 kg | |
| Vacuum melting furnaces and X-ray analysis | 2000°C | 8 to 265 kg |
Vibro cast crucibles are available in alumina only, for capacities up to 1,000 kg of steel.
Capacities from 0.5 to 1,000 kg
Isostatically pressed crucibles are available from 0.5 to 370 kg in round and flat bottomed forms. Alumina vibro cast crucibles extend the range to 1,000 kg of steel.
- Isostatically pressed
- 0.5 to 370 kg
- Vibro cast in alumina
- Up to 1,000 kg of steel
- Custom work
- To your exact requirements and tolerances
Related products
Backing Mixes
MIPEX and zirconia backing mixes share the crucible's coefficient of thermal expansion, so crucible and packing expand and contract together for a longer working life.
Zirconia Atomising Nozzles
Stabilised zirconia nozzles for powder production and spray forming, proven with superalloy, nickel and platinum based melts.
Why foundries, refiners and manufacturers choose Magna
Since 1976 we have made one thing exceptionally well: the isostatically pressed and vibro cast crucibles, zirconia nozzles and backing mixes that keep molten metal clean, from first melt to final pour.
The original, since 1976.
Fifty years of refining the isostatically pressed crucible means one that behaves predictably, melt after melt.
Engineered for clean metal.
Dense, high-purity refractories mean fewer inclusions in the melt, cleaner castings and low scrap rates we guarantee.
British-made, with technical backing.
Manufactured in Britain under ISO 9001, with our technical team alongside you from first specification to delivery, so the right crucible arrives first time.
Frequently asked questions
Magna’s technical team advises on material and process selection for specific alloys, furnaces and melt sizes. Send drawings or specifications with your enquiry.
Isostatic pressing forms the crucible under uniform pressure for the densest, most consistent refractory body, from 0.5 to 370 kg. Alumina crucibles are also vibro cast, compacting the body in the mould to extend capacities up to 1,000 kg of steel.
Specify the right crucible for your application
Send the alloy, volume and process you're working with, and our technical team will specify the right crucible.
- Reply from a technical specialist within one working day
- Drawings and specifications welcome
- No obligation