Sapphire Crucibles for Thermal Analysis

Sapphire Crucible Applications for Thermal Analysis and Materials Testing

Explore common applications and the information needed for an accurate engineering review.

• DSC, TGA and STA Thermal Analysis

  For methods requiring controlled crucible material, geometry and repeatability.
  Review inputs: Instrument, holder, method, material route, dimensions, sample, temperature, atmosphere and validation plan.

• LFA and Thermophysical-Property Measurement

  Sapphire pans and lids may be considered for selected high-temperature LFA systems using liquid or powdery metallic samples.
  Review inputs: Instrument, holder, sample state, pan and lid geometry, temperature range, atmosphere and measurement conditions.

• Metals and Alloys

  Suitable projects can be reviewed for thermal analysis and thermophysical-property measurements.
  Review inputs: Alloy composition, liquid-phase formation, wetting or reaction risk, peak temperature, dwell and atmosphere.

• Ceramics, Glass and Inorganic Materials

  May be considered when a controlled high-temperature sample container is required.
  Review inputs: Composition, fluxes, phase changes, temperature, residue and cleaning requirements.

• Catalysts and Energy Materials

  Can be reviewed for oxidation, reduction, stability and decomposition studies.
  Review inputs: Gas chemistry, heating program, dwell, residue, reaction products and reuse plan.

• Reference Parts and Legacy Geometries

  A drawing, existing crucible or holder can be used as the starting point for engineering review.
  Review inputs: Reference part, holder model, material route, complete dimensions, quantity and validation criteria.

• Other Research Applications

  Custom sapphire crucibles can also be evaluated for specialized spectroscopy, magnetic measurements and other high-temperature laboratory research.
  Application review required: Final suitability depends on the sample chemistry, geometry, temperature, atmosphere and validation method.

Sapphire Crucible Care Guide: Handling, Cleaning and Reuse

Follow these basic steps to protect the crucible, maintain test consistency and determine when replacement is required.

• Before Use

  1. Confirm whether the crucible is single-crystal sapphire or PC Sapphire / PCA.
  2. Inspect the rim, wall and base for chips, cracks or visible damage.
  3. Make sure the crucible is clean and dry before loading the sample.
  4. Verify the holder fit, seating position and lid clearance.
  5. For a new or alternative crucible, follow the laboratory’s approved blank or comparison procedure.

• Handling During and After Testing

  1. Use the crucible only within the approved test temperature, atmosphere and sample conditions.
  2. Avoid impact, excessive force and sudden temperature changes during handling.
  3. Allow the crucible to cool according to the instrument and laboratory procedure before removal.
  4. Use suitable tools to reduce contamination and damage.

• Cleaning and Reuse

  1. Select the cleaning method according to the sample residue, material route and laboratory procedure.
  2. Do not assume that one solvent, acid, burn-off cycle or mechanical method is suitable for every sample.
  3. Inspect the crucible again after cleaning and before reuse.
  4. Validate reuse when carryover, mass stability or surface changes may affect the result.

• When to Replace the Crucible

  1. Replace the crucible if chips, cracks, rim damage or geometry changes are visible.
  2. Remove it from service if persistent deposits cannot be safely cleaned.
  3. Replace it when blank, mass-stability or method-specific acceptance requirements are no longer met.
  4. Important: Final handling, cleaning and reuse procedures must be confirmed for the specific sample chemistry, test method and laboratory requirements.

Sapphire Crucible FAQs

1. Q: What is a sapphire crucible used for?
   A: Sapphire crucibles are used primarily as millimeter-scale sample containers in DSC, TGA and STA thermal analysis. Sapphire pans and lids are also used in selected thermophysical-property measurements such as LFA, and custom crucibles can be reviewed for specialized laboratory research where the material and geometry fit the experiment.
2. Q: Is a sapphire crucible always single crystal?
   A: No. In thermal-analysis supply chains, “sapphire” can refer to single-crystal sapphire or to PC Sapphire / PCA, a polycrystalline high-purity alumina route. ADCERAX separates these material routes before quotation.
3. Q: Is a 6.8 mm × 4 mm sapphire crucible always 85 µL?
   A: No. Outside diameter and overall height do not define the internal cavity. Capacity depends on the cavity diameter, inside depth, wall and base geometry, so the nominal volume must be confirmed by the drawing or specification.
4. Q: Can ADCERAX review other sizes, lids or reference parts?
   A: Yes. Multiple dimensions, capacities and lid configurations can be reviewed against the instrument holder, drawing, reference part and application requirements. A customer-supplied reference can support engineering review, but it does not imply OEM authorization or guaranteed fit.
5. Q: Can sapphire crucibles be reviewed for LFA or other research applications?
   A: Yes, selected LFA / thermophysical-property and specialized research applications can be reviewed. The measurement method, holder or cell, sample state and chemistry, temperature, atmosphere, geometry and validation requirements must be defined before suitability is confirmed.