Application fields of experimental multi zone rotary furnace

The experimental multi temperature zone rotary furnace is widely used in fields such as materials science, chemical engineering, new energy, environmental science, and metallurgical industry due to its core advantages of independent temperature control in multiple temperature zones, dynamic rotary processing, and high-precision atmosphere control. The following provides a detailed analysis from five major fields and lists typical application scenarios:

1. Materials Science: Synthesis and Characterization of High Performance Materials
Advanced Ceramic Materials
Nano ceramic sintering: By controlling the temperature gradient in multiple temperature zones (such as from 600 ℃ low temperature gel discharge to 1600 ℃ high temperature sintering), combined with the rotary mixing effect, powder agglomeration is eliminated, and the uniformity of nano ceramic grain size ≤ 50nm and density ≥ 99% are achieved. For example, in the densification sintering experiment of alumina (Al ₂ O ∝) ceramics, the rotary furnace can increase the bending strength of the sample by 20% -30%.
Preparation of functional ceramics: In the synthesis of piezoelectric ceramics (such as PZT) or ferroelectric ceramics, multi temperature zone design can accurately control the diffusion process of dopants (such as La, Nb), optimize the phase structure, and improve the piezoelectric coefficient (d ∝③≥ 300 pC/N).
Composite material processing
Carbon fiber reinforced ceramic matrix composites (CMCs): The rotary furnace dynamically disperses carbon fibers uniformly in the ceramic matrix, reducing interface defects. For example, in the preparation of SiC/SiC composite materials, the rotary process can increase the bending strength to 500-600 MPa and the fracture toughness by 50%.
Metal based composite materials (MMCs): Multi zone temperature control combined with inert atmosphere protection achieves uniform infiltration of aluminum or magnesium based composite materials. For example, in the preparation of Al ₂ O ∝/Al composite materials, the rotary furnace can control the infiltration temperature gradient to avoid porosity>1%.

2. Chemical Engineering: Catalytic Reactions and Process Enhancement
heterogeneous catalytic reaction
Fischer Tropsch synthesis (FTS): Simulating the axial temperature distribution of the reactor through multi temperature zone design (such as inlet 250 ℃, outlet 350 ℃), combined with rotary mixing to enhance gas-solid contact, improves CO conversion rate (≥ 90%) and C ₅ hydrocarbon selectivity (≥ 70%).
Methanol to olefins (MTO): In the evaluation of SAPO-34 molecular sieve catalyst, the rotary furnace can achieve dynamic mixing of reactants (methanol) and catalyst, shorten the induction period (≤ 10 min), and improve the selectivity of ethylene+propylene (≥ 80%).
Fluidized bed simulation
Scale up of gas-solid fluidized bed reactor: The rotary furnace simulates the cyclic motion of particles in the fluidized bed by adjusting the rotational speed (5-15 rpm) and tilt angle (10 ° -20 °), and optimizes the reactor design parameters. For example, in fluidized bed catalytic cracking (FCC) experiments, the rotary process can increase the yield of light oil by 5% -8%.

3. New Energy: Battery Materials and Energy Storage Technology
Positive and negative electrode materials for lithium-ion batteries
High nickel ternary material (NCM/NCA): Multi temperature zone temperature control combined with oxygen atmosphere (flow rate 50-200 mL/min), achieving segmented oxidation of precursors (such as 400 ℃ pre oxidation, 750 ℃ high-temperature solid-state reaction), controlling the Li/Ni mixing degree (≤ 3%), and improving cycling stability (1000 times capacity retention rate ≥ 85%).
Silicon based negative electrode material: The rotary furnace alleviates the volume expansion of silicon particles (≤ 150%) through dynamic processing, combined with carbon coating technology (such as CVD deposition), to improve the first efficiency (≥ 88%) and specific capacity (≥ 1500 mAh/g).
Solid state electrolyte synthesis
Sulfide solid electrolyte (such as Li ∝ PS ₄): Under argon protection, a continuous process of low-temperature sulfurization (200 ℃) and high-temperature annealing (500 ℃) is designed in multiple temperature zones to control grain boundary resistance (≤ 10 Ω· cm) and improve ion conductivity (≥ 10 Ω³ S/cm).
Oxide solid electrolytes (such as LLZO): The rotational mixing effect can eliminate Li ₂ CO Ⅲ impurities, increase the cubic phase content (≥ 95%), and reduce grain boundary impedance.

4. Environmental Science: Pollution Control and Resource Recovery
Catalytic purification of exhaust gas
VOCs catalytic combustion: In the evaluation of precious metal (Pt/Pd) or non precious metal (MnOx/CeO ₂) catalysts, the rotary furnace can simulate the airflow distribution under actual working conditions (air velocity 5000-20000 h ⁻¹), optimize the catalyst activity temperature window (such as T ₉₀ ≤ 250 ℃).
Selective catalytic reduction (SCR) of NOx: By designing multiple temperature zones to study the NH3 SCR reaction pathway (such as standard SCR and rapid SCR), low-temperature activity is improved (NOx conversion rate ≥ 90% at 150 ℃).
solid waste treatment
Fly ash melting and solidification: At high temperatures of 1400-1600 ℃, the rotary furnace achieves uniform solidification of heavy metals (such as Pb and Cd) in fly ash through dynamic mixing, reducing leaching toxicity to ≤ 0.1 mg/L (in accordance with GB 5085.3 standard).
Recycling of waste lithium batteries: Multi temperature zone temperature control combined with reducing atmosphere (H ₂/CO) is used to achieve stepwise reduction of LiCoO ₂ positive electrode material (such as 600 ℃ Co∝ O ₄ → 800 ℃ CoO), improving metal recovery rate (Li ≥ 95%, Co ≥ 90%).

5. Metallurgical Industry: Processing and Purification of High Temperature Materials
Preparation of high-temperature alloys
Nickel based single crystal superalloys: In directional solidification experiments, the rotary furnace suppresses the formation of impurities and increases the orientation deviation angle (≤ 5 ° C) by controlling the furnace tube speed (1-5 rpm) and temperature gradient (≥ 100 ℃/cm), meeting the performance requirements of aircraft engine turbine blades (creep life ≥ 1000 h).
Titanium alloy powder metallurgy: Multi temperature zone design achieves low-temperature dehydrogenation (400-600 ℃) and high-temperature sintering (1200-1400 ℃) of powders, controls oxygen content (≤ 0.15%), and improves density (≥ 99.5%).
Metal purification and refining
Zone Refining: The rotary furnace achieves high-purity purification of metals (such as silicon and germanium) by moving the heating zone (at a speed of 0.1-10 mm/min), with impurity segregation coefficient ≤ 10 ⁻⁶ and purity ≥ 9N (99.999999999%).
Vacuum distillation purification: Under a vacuum environment of ≤ 10 Pa, multiple temperature zones are controlled to achieve the separation of low boiling point metals (such as zinc and cadmium), with a purity of ≥ 99.995%.