High Purity Alumina Round Trays for Industrial Sintering & Laboratory Use

Round Alumina Ceramic Trays Applications

• Laboratory Calcination & Drying — small batches, repeat cycles

  ✅ Key Advantages

  1. Flatness-controlled faces keep stack variance ≤0.5 mm across typical lab loads.
  2. Thin-wall options reduce cycle time by 5–10% where thermal ramp is rate-limited by mass.
  3. Dense Al₂O₃ surfaces lower visible residue transfer over >50 cycles when used with ceramic paper.

  ✅ Problem Solved

  A lab needed repeatable mass-loss data during calcination. By moving to a Ø200 mm, t=6 mm tray with a ≤0.3 mm flatness target and ceramic paper, the team reduced sample adhesion events and improved run-to-run variation. Across two months, rework incidents decreased by ~12%, and cycle time improved by ~7% due to the lower thermal mass configuration.

• Electronics Sintering (MIM, thick-film, resistors) — production carriers

  ✅ Key Advantages

  1. Controlled flatness and edge radius help maintain stack height tolerance within ±0.6 mm.
  2. Material stability supports repeated firings without shape drift when used within the rated temperature.
  3. Polished face reduces sticking on delicate green parts, improving first-pass yield in pilot lots.

  ✅ Problem Solved

  In pilot runs for thick-film parts, specifying 99.7% Al₂O₃, polished working face, and a warpage limit per drawing reduced handling marks and stabilized stack geometry, improving screened yield and lowering scrap during scale-up.

• Fine Chemicals & Catalyst Processing — trays for powders and pellets

  ✅ Key Advantages

  1. Chemically inert carrier reduces interaction with acidic or basic atmospheres.
  2. Thick-wall trays support uniform loading for a multi-layer charge without deformation.
  3. Compatible with vacuum or mild reducing steps when process parameters are observed.

  ✅ Problem Solved

  For catalyst precursor drying, moving to thicker trays with set load per tray and flatness spec allowed denser, even layers, cutting edge-overheating issues and reducing post-process screening time in validation lots.

Al2O3 Round Trays Usage Instructions

• Operation

  1. Verify tray dimensions, flatness target, and allowable load per tray.
  2. Line the working face with compatible ceramic paper where sticking is a risk.
  3. Distribute mass evenly; avoid overhanging parts; respect stack height clearance.
  4. Follow furnace ramp/soak limits appropriate for tray thickness to prevent thermal shock.

• Storage

  1. Store flat on a stable shelf with interlayers; avoid cantilevered stacks.
  2. Separate finished trays from raw powder areas to prevent contamination.

• Cleaning & Care

  1. Dry brush or vacuum loose residue after cool-down; avoid metal scrapers.
  2. If needed, run a burn-off at a moderate temperature; confirm compatibility of any solvents.

• Common Misuse & Fix

  1. Issue: Sticking after high-temp soak → Fix: Add ceramic paper or use polished face.
  2. Issue: Warpage noted after heavy load → Fix: Increase thickness or reduce per-tray mass; tighten flatness spec.
  3. Issue: Uneven heating → Fix: Re-balance stack height and spacing; verify ramp rate vs. tray mass.

Round Alumina Trays FAQ

1. Q: Can the trays be reused multiple times under 1600°C?
   A:  Yes. Based on operational conditions, alumina trays can be reused more than 30 cycles without cracking or major deformation.
2. Can I choose a polished finish to reduce the adherence of materials?
   A: Yes. You can specify polished or sandblasted surfaces based on the material type, sintered.
3. Q: What is the standard tolerance for round trays?
   A: Standard dimensional tolerance is ±0.2mm, with tighter tolerances on request.
4. Q: Can trays withstand an atmosphere with H₂ or N₂ gases?
   A: Alumina is chemically inert in controlled atmospheres like hydrogen or nitrogen at standard sintering temperatures.
5. Q: How do I prevent sticking on the tray surface?
   A: Use ceramic paper or a porous alumina cover plate and avoid over-soaking during softening
6. Q: Which information is needed to receive a quotation for alumina round trays?
   A: To receive an accurate quotation, please provide the following details: diameter, thickness, flatness requirement, order quantity, and the intended atmosphere/peak temperature for your process.

What Our Customers Say about Alumina Round Trays

• ⭐️⭐️⭐️⭐️⭐️
  We customized an Ø220 mm alumina round tray with a tighter flatness target. Stack height variability dropped, and first-pass yield improved during ramp-up.
  -- Marco R., Process Engineer, E-Resistors GmbH
• ⭐️⭐️⭐️⭐️⭐️
  Round alumina tray with thin-wall option cut our cycle time by a few percent without compromising stability. Cleaning is straightforward with ceramic paper.
  -- Hannah T., Lab Manager, Northfield Materials
  
• ⭐️⭐️⭐️⭐️⭐️
  Switching to thick-wall alumina ceramic round trays stabilized heavy powder loads. The polished face and interlayers minimized residue after multiple runs.
  -- Daniel P., Production Supervisor, CatalystWorks
• ⭐️⭐️⭐️⭐️⭐️
  Custom edge radius and ID marking improved both handling and traceability, and repeat orders were delivered according to the drawing with no modifications needed.
  -- Luis A., Operations Lead, TechCeram Components