Furnace sintering is the densification step that turns a green powder compact or coated tape into a phase-pure, mechanically robust ceramic — and for solid-state battery research, it is usually where the electrolyte either succeeds or fails. This page collects the box, tube, and atmosphere furnaces our customers use for calcining precursors, sintering oxide and sulfide pellets, co-firing cathode/electrolyte stacks, and post-annealing thin films.
Equipment is grouped by the regime it serves rather than by raw temperature alone, because atmosphere control matters as much as the setpoint:
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Air / oxygen box furnaces — for calcining layered oxide precursors (NCM, LCO), oxide-garnet powders such as LLZO, and perovskite or NASICON-family targets where oxygen partial pressure must stay high through the dwell.
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Tube furnaces with controlled atmosphere — for reducing or inert firing of olivine LFP/LMFP, polyanion NASICON cathodes (NVP, NVPF), and silicon or hard-carbon anode precursors under argon, nitrogen, forming gas, or flowing CO2.
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High-temperature sintering furnaces (1500 C and above) — for densifying garnet, perovskite, and LISICON pellets, alumina and zirconia setters, and sapphire or YSZ components used as crucibles and supports.
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Vacuum and glovebox-compatible tube furnaces — for sulfide solid electrolytes (Li6PS5Cl, Li7P3S11), lithium-metal-adjacent annealing, and any work that cannot tolerate trace oxygen or moisture during the ramp.
When you select a furnace, match three things first: the maximum stable hot-zone temperature, the gas-handling system (sealed flange, mass-flow controller, scrubbed exhaust), and the crucible / boat material compatible with your chemistry — alumina is fine for most oxides, but sulfides need glassy carbon or quartz, and lithium-bearing melts attack alumina above roughly 1100 C.
If you are densifying oxide solid electrolytes or co-firing cathode composites, start with the high-temperature box and tube furnaces. If you are calcining cathode or anode precursors at moderate temperature with strict atmosphere control, the controlled-atmosphere tube furnaces are the right starting point. For upstream powder preparation that feeds these runs, see Solid-State Synthesis and the broader Synthesis Equipment section; for the crucibles, boats, and setters that go inside the hot zone, see the consumables listed under Laboratory Equipment.
