Products Detials
Alumina Ceramic Tubes (Corundum Tubes)
Manufactured with alumina (Al2O3)) as the primary raw material via shaping and high‑temperature sintering at 1600–1800 °C, these are high‑performance industrial ceramic tubes. They are mainly categorized into 95% alumina, 99% corundum, and 99.7% high‑purity corundum tubes. Featuring high temperature resistance, electrical insulation, wear resistance and corrosion resistance, they serve as
core components for high‑temperature, precision and corrosive‑condition applications.
I. Main Grades & Temperature Resistance Selection (Critical)
| Grade | Alumina Content | Continuous Operating Temperature | Application Scenarios |
|---|---|---|---|
| 95% Alumina Ceramic Tube | 95% | 1400 °C | Conventional electric furnaces, thermocouple protection, insulating sleeves, medium‑temperature conveyance |
| 99% Corundum Tube | 99% | 1550–1600 °C | High‑temperature furnaces, lithium‑battery sintering, metallurgical flow guiding, highly corrosive media |
| 99.7% High‑Purity Corundum Tube | 99.7% | Above 1650 °C | Semiconductors, vacuum furnaces, high‑purity experiments, metal‑free‑contamination environments |
II. Key Properties
High Temperature Resistance: No deformation or softening at high temperatures; excellent thermal stability and thermal shock resistance to rapid heating and cooling.
Superior Electrical Insulation: Extremely high volume resistivity, reliable high‑voltage insulation with no electric leakage, suitable for electrical equipment and sensors.
Corrosion Resistance: Resistant to acids, alkalis, salt spray and molten salts; inert to most chemical media.
High Wear Resistance: Mohs hardness of 9 (second only to diamond), far more wear‑resistant than stainless steel.
High Purity & Contamination‑Free: No precipitation of metal ions, ideal for lithium batteries, semiconductors and precision experiments.
III. Common Structures & Specifications
Types: Single‑bore, double‑bore, four‑bore multi‑hole tubes, one‑end‑closed protection tubes, straight tubes
Dimensions: Outer diameter 3–200 mm, wall thickness 1–15 mm, maximum length 2500 mm; custom sizes available
Functional Types: Thermocouple protection tubes, insulating sleeves, furnace tubes, flow‑guiding tubes, conveyance tubes
IV. Main Application Fields
Thermal Instruments & Electric Furnaces: Thermocouple protection sleeves, furnace tubes for high‑temperature resistance furnaces, insulation parts for heating elements
New Energy: Sintering of lithium‑battery cathode materials, high‑temperature conveyance of photovoltaic silicon materials
Chemical Industry & Metallurgy: Conveyance of acid‑alkali media, flow guiding of aluminum/copper melts, molten salt pipelines
Electronics & Semiconductors: Insulation parts for vacuum furnaces, wafer diffusion tubes, high‑voltage insulation supports
Scientific Laboratories: Tube furnaces, muffle furnaces, high‑temperature crucible tubes for experiments, atmosphere sintering tubes
V. Selection Guidelines
For general high‑temperature conditions with budget constraints: Choose 95% grade
For temperatures above 1500 °C, corrosive environments or high‑purity requirements: Choose 99% or 99.7% high‑purity corundum tubes
For thermocouple use: Prioritize one‑end‑closed corundum protection tubes; use multi‑hole ceramic tubes for insulation purposes