Corundum-mullite Tubes

In terms of material structure, the composite matrix of α-alumina corundum and mullite endows the tube with outstanding comprehensive properties. Compared with single-phase corundum tubes, corundum-mullite tubes feature lower thermal expansion coefficient and better thermal shock resistance. When exposed to repeated drastic temperature rise and cooling cycles, the material is far less likely to crack. Meanwhile, it retains the high refractoriness of corundum-based ceramics. The continuous service temperature can reach 1500℃, and the short-term extreme working temperature can approach 1650℃. It can operate stably for a long time under high-temperature oxidizing atmosphere.

The product boasts excellent chemical corrosion resistance. It hardly reacts with most molten metals, slags, acid and alkaline gases at high temperatures. It will not be eroded by sulfur atmosphere, carbon atmosphere and weak molten alkali under conventional working conditions. Therefore, it avoids contamination to samples and materials during production and testing, ensuring the purity of experimental samples and industrial products. It is widely used in environments where high-temperature chemical stability is required.

Mechanically, corundum-mullite tube maintains decent bending strength and compressive strength at elevated temperatures. It will not undergo obvious softening or creep deformation under long-term high-temperature load. We can customize various specifications, including straight tubes, flanged tubes, stepped tubes, open-end or closed-end tubes according to customer drawings. Precision machining such as drilling, grooving and cutting can be carried out to meet the assembly requirements of tubular furnaces, atmosphere furnaces, thermal analysis instruments and industrial kilns.

General Features

Technical Characteristics

∆ The above data is offered for reference and comparison only, exact data will vary depending on manufacturing method and part configuration.

Standard Size of Corundum-mullite Tubes

Applications

Typical application scenarios cover multiple industries. In laboratory field, it serves as furnace tube for tube furnaces, sample protection sleeve for thermal gravimetric analysis equipment. In advanced material manufacturing, it is used for sintering protection tubes for ceramic powder, new energy material calcination and precious metal thermal treatment. In metallurgy and chemical industry, it acts as thermocouple protection sleeves, high-temperature gas delivery pipelines and liquid metal isolation sleeves.

We implement strict quality control throughout the whole production process from raw material formulation, forming, high-temperature firing to precision finishing. Each batch of corundum-mullite tubes is inspected for dimensional tolerance, appearance, thermal stability and refractoriness. Customized dimensional standards, surface treatment and special forming processes are supported to satisfy differentiated working condition demands.

Compared with silicon carbide, quartz glass and ordinary alumina tubes, corundum-mullite tubes provide a cost-effective solution for medium-to-high temperature service environments with frequent temperature fluctuations. If your equipment faces challenges such as frequent tube cracking, high-temperature deformation or sample pollution, corundum-mullite ceramic tubes will be a reliable long-term choice to extend equipment service life and reduce maintenance costs.

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