1000ML Rectangular Alumina Crucible for Lab & Pilot Sintering

Applications for Rectangular Alumina Crucibles

• Laboratory Research & Chemical Analysis

  ✅ Key Advantages

  1. Accurate sample consistency — Rectangular crucibles with ml-calibrated volumes reduce dosing error by up to 15% compared with unmarked round crucibles.
  2. Stable mass recovery — Flat-bottom design improves sample retrieval efficiency by 12–18% in repeated ash tests.
  3. Heat-resistant reliability — Maintains dimensional stability at >1600 °C, ensuring reproducibility across multiple firing cycles.

  ✅ Problem Solved

  A university chemistry lab compared round and rectangular alumina crucibles during gravimetric ash analysis. The ml-marked rectangular crucibles reduced weighing inconsistencies, cutting re-test frequency by 20%. Mass recovery improved across five consecutive runs, lowering sample loss and extending crucible life. Researchers reported more reliable results and reduced turnaround time for student projects.

• Industrial Powder Metallurgy & Ceramic Sintering

  ✅Key Advantages

  1. Higher furnace utilization — Rectangular crucibles increased tray loading density by up to 22%, maximizing cycle throughput.
  2. Reduced reject rate — Uniform wall thickness minimized thermal gradients, cutting micro-crack incidence by ~30% during sintering.
  3. Durability in long runs — Survives >100 heating cycles at 1600 °C without warping or corner chipping when corner-radius R ≥ 2 mm.

  ✅ Problem Solved

  A powder metallurgy pilot line switched to rectangular alumina crucibles for the calcination of cathode powders. Shelf density increased from 72 to 88 crucibles per cycle, improving production by 22%. Rejects from edge-cracked crucibles fell by nearly one-third, and average crucible lifespan doubled. This change directly reduced consumable spend and stabilized weekly output for pre-commercial batches.

• Electronics & Electrical Insulation Testing

  ✅Key Advantages

  1. Low dielectric loss — Alumina crucibles maintain dielectric strength of >10 kV/mm, suitable for insulating powders during high-temp tests.
  2. Contamination-free melting — Alumina purity ≥99.7% reduces ionic contamination risk by 40% compared with quartz alternatives.
  3. Consistent thermal cycle performance — Rectangular crucibles withstand rapid 10–15 °C/min heating rates without cracking.

  ✅ Problem Solved

  An electronics materials company used rectangular alumina crucibles to evaluate insulating oxides for capacitor applications. The high dielectric stability allowed repeated testing without spurious conduction events. By avoiding contamination from quartz crucibles, reject rates in dielectric breakdown tests fell by 40%. The crucibles’ resistance to rapid heating cycles also cuts downtime, enabling faster qualification of new material batches.

Usage Instructions for Rectangular Alumina Crucible

• Use

  1. Inspection before use
  a.Check for chips, cracks, or surface defects before each cycle.
  b.Pre-dry crucible at 110–150 °C for 1–2 hours to remove moisture.

  2. Loading sample
  a.Distribute material evenly across the flat base; avoid uneven piling.
  b.Do not exceed 70–80% of total ml capacity to prevent overflow.
  c.For volatile samples, use a lid or cover to minimize loss.

  3. Operation during heating
  a.Increase temperature gradually; recommended ramp rate: ≤ 5–10 °C/min for cycles above 1000 °C.
  b.Avoid sudden cooling; allow crucible to cool inside the furnace chamber whenever possible.

  4. Using lids
  a.Place lids loosely to allow controlled gas exchange.
  b.For atmosphere-controlled tests, confirm lid fit according to protocol requirements.

• Storage

  a.Store crucibles in a dry, dust-free environment with stable room temperature.
  b.Use foam, tissue, or felt separators between crucibles to prevent edge abrasion.
  c.Keep standard sizes grouped and labeled (e.g., 25 ml, 100 ml, 250 ml) for easier selection.
  d.Avoid stacking more than 3–4 layers to reduce risk of edge cracking.

• Cleaning

  1. Cooling
  a. Always allow natural cooling to room temperature before handling.
  b. Avoid sudden immersion in water or solvents on hot crucibles.

  2. Residue removal
  a.Gently brush off loose powder or ash with a soft ceramic brush.
  b.For stubborn residues, soak in dilute acid or alkali solutions compatible with alumina, then rinse and dry.

  3. Re-drying
  a.After wet cleaning, re-dry crucibles at 110–150 °C for 1–2 hours before reuse.
  b.Store only when fully dry to prevent micro-cracks from moisture exposure.

• Common Misuse & Fix

  a. Thermal shock (cracks)→ Use slower heating/cooling ramps (≤ 5–10 °C/min) or select thicker wall crucibles for aggressive cycles.
  b.Edge chipping→ Order crucibles with larger corner radius (R ≥ 2 mm) or use alumina setter plates during loading/unloading.
  c.Residue contamination→ Dedicate crucibles for specific chemistries (e.g., oxides, salts, alloys). Clean thoroughly between series to avoid cross-contamination.
  d.Overloading→ Keep sample volume below 80% of crucible ml capacity; overfilled crucibles increase spill risk and shorten lifespan.
  e.Improper lid use→ Do not seal lids tightly unless required by controlled-atmosphere testing; otherwise, pressure buildup may cause cracking.

Alumina Crucibles Rectangular FAQ

1. Q: What is the maximum temperature a rectangular alumina crucible can withstand?
   A: Our standard rectangular alumina crucibles can typically withstand temperatures up to 1730°C . Specific grades may vary, so please check the specifications for your chosen alumina rectangular crucible.
2. Q: Are your rectangular alumina crucibles suitable for melting metals?
   A: Yes, high-purity rectangular alumina crucibles are excellent for melting many types of metals and alloys due to their high-temperature stability and chemical inertness. However, always verify compatibility with specific aggressive molten metals.
3. Q: How resistant are these rectangular alumina crucibles to thermal shock?
   A: Our rectangular alumina crucibles are designed for good to excellent thermal shock resistance. However, very rapid heating or cooling rates should still be managed, especially for larger alumina rectangular crucibles.
4. Q: Can your rectangular alumina crucibles be used in a vacuum furnace?
   A: Yes, high-purity rectangular alumina crucibles are well-suited for use in vacuum furnaces due to their low outgassing properties at high temperatures.
5. Q: Can you mark volume or an internal code?
   A: Yes—ml capacity and engraved IDs can be added for traceability.
6. Q: Can I order a rectangular alumina crucible with a lid?
   A: Yes—flat or recessed lids are available; they reduce volatilization and help atmosphere control.

Customer Testimonials for Rectangular Aalumina Crucible

• ⭐️⭐️⭐️⭐️⭐️
  “Rectangular alumina crucibles aligned perfectly with our shelf frames; ml labeling simplified batch logs.”
  -- R&D Manager, Battery Materials (Germany)
• ⭐️⭐️⭐️⭐️⭐️
  “Using rectangular alumina crucibles, the corner-radius customization reduced chipping across weekly cycles.”
  -- Process Engineer, Ceramics Pilot Line (USA)
  
• ⭐️⭐️⭐️⭐️⭐️
  “Lidded rectangular cups stabilized mass loss tests during long holds.”
  -- Lab Supervisor, Thermal Analysis (UK)
• ⭐️⭐️⭐️⭐️⭐️
  “Using alumina rectangular crucibles, students performed pour-out more safely, and the results were easier to compare across groups.”
  -- Metallurgy Instructor (Canada)