Cylindrical Alumina Crucible for Ashing, Calcination & Melting

 Cylindrical Alumina Crucibles Applications

• Cylindrical Alumina Crucibles for Laboratory Ashing and Calcination

  Cylindrical alumina crucibles are commonly used in laboratory ashing, residue testing and calcination workflows where clean sample containment and stable heating are important. The straight-wall shape helps improve loading consistency, while high-purity Al₂O₃ helps reduce unwanted reaction between the crucible and sample material.

  This application is suitable for oxide powders, inorganic residues, ceramic precursors, mineral samples and other materials that require controlled high-temperature treatment.

• Cylindrical Alumina Crucibles for Metal Melting and Alloy Trials

  For small-batch metal melting and alloy development, alumina cylindrical crucibles provide a chemically stable container for many non-aggressive melts and test materials. Lid options can help reduce volatilization, while thicker wall designs may be considered for longer heating cycles or larger sample loads.

  Before use, the melt chemistry, temperature, atmosphere and possible reaction with alumina should be reviewed to confirm material suitability.

• Cylindrical Alumina Crucibles for Powder Sintering and Heat Treatment

  In powder metallurgy, ceramic sintering and heat-treatment experiments, cylindrical alumina crucibles help maintain sample shape, loading depth and repeatable furnace positioning. The uniform cylindrical form is useful when the crucible must fit a holder, tray, tube furnace zone or repeated test fixture.

  Custom OD, ID, height, wall thickness and lid design can be reviewed for special furnace setups.

Cylindrical Alumina Crucible Usage Instructions

• Before Use

  Inspect the crucible for chips, cracks or edge damage before heating. If the crucible has been stored in a humid environment, pre-dry it at low temperature before the first high-temperature cycle.

• Heating

  Use a controlled heating rate, especially for larger or thick-wall crucibles. Avoid placing cold samples, tools or support fixtures directly into a hot crucible, as sudden temperature changes can cause thermal stress.

• Handling

  Use suitable tongs, support rings or carriers. Do not clamp the hot rim with excessive force. For large-volume crucibles, support the base during transfer to reduce uneven stress.

• Cleaning

  Allow the crucible to cool gradually before cleaning. Remove residues with non-metallic tools where possible. For difficult deposits, use a validated cleaning method that does not attack alumina or leave harmful contamination.

• Storage

  Store in a dry, ventilated area. Use separators or foam sheets between units to prevent chipping. Avoid stacking rim-to-rim, which can cause stress fractures during handling. For long-term storage, reseal in moisture-proof packaging.

• Common Problems and Prevention

  Issue	Likely Cause	Recommended Action
  Thermal shock cracking	Rapid heating, cooling or cold contact	Slow the ramp rate and preheat support fixtures.
  Lid sticking	Volatile residue or tight lid clearance	Use a vented lid or leave proper clearance.
  Residue carryover	Mixed chemistries in the same crucible	Dedicate separate crucibles for different materials.
  Warping or edge damage	Overloading or uneven handling	Choose thicker walls and support the base during transfer.
  Surface erosion	Aggressive chemistry or atmosphere	Review purity, wall thickness and process compatibility.

Alumina Cylindrical Crucible FAQ

1. Q: What temperature can a cylindrical alumina crucible withstand?
   A: High-purity cylindrical alumina crucibles are commonly used in high-temperature furnace processes, but the suitable working temperature depends on alumina purity, wall thickness, load, atmosphere and heating cycle. For critical applications, please confirm the target temperature and process conditions before quotation.
2. Q: Can cylindrical alumina crucibles be used for metal melting?
   A: Yes, alumina cylindrical crucibles can be used for many small-batch melting and alloy trial applications. However, compatibility depends on the molten material, slag, flux, temperature and atmosphere. Aggressive melts or reactive chemistries should be reviewed before use.
3. Q: What purity should I choose: 99%, 99.5% or 99.7% alumina?
   A: 99% alumina is suitable for many general high-temperature processes, while 99.5% and 99.7% alumina are often selected when lower contamination, better chemical stability or higher temperature resistance is required. The best choice depends on your sample chemistry and furnace conditions.
4. Q: What is the difference between a cylindrical alumina crucible and a tapered crucible?
   A: A cylindrical alumina crucible has straight walls and a more uniform internal diameter, which helps with fixture fit, sample depth control and repeatable positioning. A tapered crucible is usually easier to remove or pour from, but it may not fit some holders or furnace supports as precisely.
5. Q: Can you customize OD, ID, height, wall thickness or lids?
   A: Yes, ADCERAX can review custom OD, ID, height, wall thickness, bottom geometry, lid type, vent hole and surface finish according to your drawing or application requirements. Please provide dimensions, quantity, purity and working conditions for quotation.
6. Q: How can I reduce cracking during use?
   A: Use a controlled heating and cooling rate, avoid sudden contact with cold tools or samples, pre-dry the crucible if stored in humid conditions and choose suitable wall thickness for the load and cycle time. Large-volume crucibles should be supported from the base during handling.