Stackable Alumina Saggar/Sagger, Multi-Cavity, Polished Surface for Electronic Ceramics

Alumina Saggars Applications

• Cathode Powder Calcination (Battery Materials)

  ✅ Key Advantages

  1. Reduced cross-contamination: dense alumina body and optional liner limit alkali interactions and particle fall-back.
  2. Stable stacking: controlled flatness/warpage maintains even bed depth and consistent heating profiles.
  3. Cycle endurance: optimized wall thickness and fillets support repeated ramp/soak cycles at 1,600 °C class.️

  ✅ Problem Solved

  During a cathode powder scale-up, switching to deep-box alumina sagger with lids and Ø4 mm vents stabilized bed uniformity; loading density increased by ~12% while defect-related rework fell noticeably. The thicker corner radii cut corner chipping events across ~800–1,000 thermal cycles per set, improving maintenance intervals and furnace uptime.

• MIM/CIM Debinding–Sinter (Powder Metallurgy)

  ✅ Key Advantages

  1. Low residue risk: chemically inert surface helps avoid carbon pickup and shape drift.
  2. Vent control: designed venting patterns guide binder removal and reduce blistering.
  3. Dimensional consistency: flatness and cavity separation support uniform shrinkage.

  ✅ Problem Solved

  With vented alumina saggers, binder removal became more uniform; out-of-spec warpage complaints dropped after aligning vent area with part geometry. Trials showed a measurable reduction in scrap during the first production month and faster stabilization of the sintering recipe.

• Electronic Ceramic Substrates

  ✅ Key Advantages

  1. Low particle shedding: polished or fine-ground surfaces minimize surface defects.
  2. Planarity: tight flatness and low warpage help control bow/tilt of thin sheets.
  3. Repeatability: batch-to-batch dimension control supports predictable stacking density.

  ✅ Problem Solved

  Adopting polished contact surfaces and stackable shoulders improved sheet planarity and simplified line-side handling. The production line reported steadier first-pass yield during quarterly audits, with fewer corrective cleans between cycles.

Alumina Sagger Usage Instructions

• Before first use

  1. Inspect lids, stack interfaces, and contact surfaces for chips or cracks.
  2. Wipe all surfaces with a lint-free cloth to remove packing dust.
  3. Pre-dry in a kiln or oven at 120–150 °C for 2–4 hours to drive off absorbed moisture; this prevents spalling during the first heat-up.

• Loading

  1. Distribute weight evenly across the base; avoid point loads from sharp-edged parts.
  2. Align vents/lids with gas flow direction according to the process recipe.
  3. Do not overload trays; keep recommended fill depth (typically ≤70% of saggar height) to ensure binder removal and gas circulation.

• Cycle settings

  1. Follow controlled heating/cooling ramp rates; sudden temperature changes increase thermal stress.
  2. Keep soak times and maximum temperatures within the grade’s specification (e.g., ≤1,650–1,700 °C for 99% alumina).
  3. Record cycle count per batch; rotate stock so older saggers are used consistently to prevent uneven ageing.

• Cleaning

  1. Cool saggers to room temperature naturally before stacking.
  2. Use spacers or pads between layers to prevent surface-to-surface abrasion.
  3. Mark each batch with FIFO (first-in, first-out) labels, including cycle count, to help monitor expected lifetime.
  4. Store in a dry, dust-controlled area to prevent contamination.

• Common misuse (to avoid)

  1. Over-tight stacking that restricts binder vapour or gas flow, leading to blistering.
  2. Exceeding the design temperature or holding too long at maximum soak.
  3. Subjecting saggers to harsh quenching or thermal shock (e.g., opening furnace door prematurely).
  4. Dropping or striking saggers, especially corners and edges that are stress concentrators.

Alumina Sagger FAQ

1. Q: Which alumina grade should I choose?
   A: Use 99% for general cleanliness and durability; choose 99.5–99.7% or low-sodium options when powders are sensitive to alkalis or require tighter contamination control.
2. Q: How do I size wall thickness and depth?
   A: Balance thermal cycle life (thicker walls, larger radii) with weight and loading density. Share cycle profile, target life, and furnace type to optimize thickness.
3. Q: Do I need a lid or vents?
   A: Lids reduce particle fall-back and modulate vapour exchange; vent holes (e.g., Ø3–6 mm) support debinding or gas flow. Your recipe determines the combination.
4. Q: What is the maximum continuous temperature for alumina saggar?
   A: Typical continuous service is 1,600–1,700 °C, depending on grade, wall thickness, and atmosphere.
5. Q: How many cycles for alumina sagger?
   A: Service life depends on cycle severity and handling. Engineering teams often plan for hundreds of cycles per set; share your target to model TCO.
6. Q: Can you provide anti-sticking or liners for the alumina sagger?
   A: Yes. Options include polished surfaces, coated contact areas, or removable liners to reduce residue and simplify cleaning.

What Our Customers Say about Alumina Saggars

• ⭐️⭐️⭐️⭐️⭐️
  “Drawing-based alumina sagger with lids improved bed uniformity; the first-pass yield stabilized across weekly runs.”
  — Process Engineer, Battery Materials
• ⭐️⭐️⭐️⭐️⭐️
  “Stackable deep alumina saggers increased parts per load without extra fixtures; cycle life met our quarterly target.”
  — Production Manager, MIM Components
• ⭐️⭐️⭐️⭐️⭐️
  “Polished contact surfaces reduced particle marks on thin ceramic alumina saggar; line changeovers became quicker.”
  — Quality Lead, Electronic Ceramics
• ⭐️⭐️⭐️⭐️⭐️
  “Alumina sagger customize vent pattern matched our debinding profile; scrap from blistering was significantly lower than the prior setup.”
  — R&D Engineer, Speciality Ceramics