| Customization: | Available |
|---|---|
| After-sales Service: | on-Line Service |
| Warranty: | 1 Years |
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Purpose:
The versatile corundum furnace tube serves as the robust inner lining of various experimental electric furnaces. Its primary function is to effectively isolate the heating elements from the test materials, while securely enclosing the heating zone and holding the test substances. This essential component finds widespread usage in high-temperature testing and analytical instruments across industries such as coal testing, metallurgical powder analysis, and chemical/glass laboratory equipment.
Material & Manufacturing Excellence:
Crafted with precision, corundum furnace tubes are primarily made of high-quality fused alumina, available in two distinct types:
Ultra-fine powder-bonded for superior durability
Clay-bonded for enhanced structural integrity
Our specifications can be meticulously customized based on user-specific requirements, including operating temperature, wear resistance, and chemical corrosion resistance for optimal performance.
Customizable Dimensions:
Outer diameter options: 15-200 mm
Length versatility: 100-2000 mm
Wall thickness range: 3-15 mm
Usage Guidelines for Optimal Performance:
When operating high-temperature testing equipment, it is vital to ensure: gradual and controlled heating and cooling processes This careful approach helps minimize internal stress caused by thermal expansion and contraction, significantly reducing the risk of cracking and extending the tube's service life.
Superior Composition:
Expertly crafted from porous fused alumina, our crucibles offer unmatched durability and exceptional heat resistance.
Versatile Applications:
Perfectly suitable for the melting of samples with weak alkaline fluxes (e.g., anhydrous NaCO)
Note: Not suitable for use with strong alkaline fluxes (e.g., NaO, NaOH) or acidic fluxes (e.g., KSO).
Featuring 99.70% Corundum for superior quality
Max short-term temperature endurance: 1800°C, ensuring reliable performance under extreme conditions
Maintains exceptional mechanical strength in both oxidizing and reducing atmospheres.
Benefit from high thermal conductivity combined with low thermal expansion for enhanced efficiency.
Ideal Operating Range: 1650-1700°C, offering stability and reliability
Exceptional high-temperature insulation &
Chemically inert to air, steam, H, CO, etc., providing resilience up to 1700°C.
Corundum Quality Assurance at 99.35%
Max short-term temperature capacity: 1750°C for steadfast performance
Reliable operating range: 1600-1650°C for consistent results
Stability maintained in both oxidizing and reducing environments.
High-Alumina Excellence at 85.00%
Max short-term temperature threshold: 1400°C for secure handling
Effective operating range: 1290°C for dependable application
Offers reliable insulation & robust mechanical strength in both oxidizing and reducing atmospheres.
Leverage high thermal conductivity with minimal thermal expansion for superior thermal management.
Chemically resilient and inert to exposure to air, steam, H, CO, etc.
Perfectly Suitable for A Wide Range of Applications! Engineered for extended longevity, our product ensures dependable performance over the long haul. Operating seamlessly under precisely controlled temperature conditions.
Quartz glass tubes, crafted from silicon dioxide (SiO), are an elite industrial technical glass. This exceptional material boasts remarkable physical and chemical properties, such as:
Softening point: approximately 1730°C
Enduring performance for long-term utilization at temperatures up to 1100°C
Short-term peak temperature: 1450°C
Almost entirely inert to a broad spectrum of acids except for hydrofluoric acid (HF).
Superior Acid Resistance:
30 times greater than ceramics
150 times more enduring than stainless steel
Exhibits unrivaled high-temperature chemical stability, outclassing other engineering materials.
Characterized by an extremely low thermal expansion coefficient.
Capable of withstanding abrupt temperature fluctuations (e.g., heating to 1100°C followed by immediate quenching in water at room temperature without cracking).
Delivers excellent light transmission from ultraviolet through to infrared spectra.
Visible light transmission rate: Exceeds 93%
UV spectrum transmission rate: Reaches upwards of 80%+
Electrical resistivity: 10,000 times higher than standard glass.
Retains exceptional insulating properties even at elevated temperatures.
Usage & Key Properties
Capable of enduring temperatures up to 1450°C, available in both transparent and opaque types.
Core Advantages: High purity, excellent resistance to heat, accommodating large sizes with precision, superb thermal insulation, energy efficiency, and consistent quality.
Chemical Compatibility
Not suitable for use with hydrofluoric acid (HF) .
At elevated temperatures, prone to reactions with caustic alkalis and alkali metal carbonates.
Suitable for Specific Fluxes
Perfect for melting samples using potassium pyrosulfate (KSO) or potassium bisulfate (KHSO).
Also compatible with sodium pyrosulfate (NaSO), pre-dried at 212°C for sample processing applications.
Quartz Crucible Usage & Maintenance
Primary chemical composition: Silicon dioxide (SiO) provides the core composition of our advanced SiC rods, ensuring robust performance and lasting durability.
Our cutting-edge rods boast an outstanding chemically inert nature against most acids, sparing only hydrofluoric acid (HF), while engaging with caustic alkalis and alkali metal carbonates.
Showcasing excellent thermal stability, our SiC rods are engineered for reliability in high-temperature environments, adapting seamlessly to fluctuating conditions.-can be heated directly over a flame, offering unparalleled versatility in a range of heating applications.
Despite their fragile, glassware-like nature, our rods deliver exceptional performance, necessitating mindful handling to preserve integrity.-requires careful handling to prevent accidental breakage, ensuring longevity and peak performance.
Approved and permissible fluxes:
KHSO (potassium bisulfate), NaSO (sodium pyrosulfate, pre-dried at 212°C), and more, ensuring safe and effective usage.
Remarkably withstands a maximum melting temperature of 800°C, underscoring its high-performance capabilities in rigorous applications.
Handling Precautions
Brittle and fragile construction-handle with care to avoid breakage; proper handling guarantees product longevity and efficiency.
Cleaning
Can be cleaned with dilute inorganic acids (except HF), maintaining pristine conditions without compromising structural integrity..
Material Characteristics: Our rods are hard, brittle, and designed to resist thermal shock. They maintain their shape under high temperatures. Explore their comprehensive physical attributes:
Density: 3.2 g/cm³ - an optimal balance for high performance.
Mohs Hardness: 9.5 - ranking high in durability and resistance.
Specific Heat: 0.17 kcal/kg·°C - efficient heat capacity for energy conservation.
Thermal Conductivity: 20 kcal/m·h·°C - ensures optimal heat transfer for effective operation.
Linear Expansion Coefficient: 5×10 (m/°C) - stability across temperature variations.
Silicon carbide rods feature excellent chemical stability and formidable resistance to acids, though alkaline substances can impact them at elevated temperatures.
When used long-term above 1000°C, silicon carbide rods engage with oxygen and water vapor:
SiC + 2O → SiO + CO
SiC + 4HO → SiO + 4H + CO
These reactions enhance the SiO content in the rod, leading to increased resistance and accelerated aging.
Excessive water vapor hastens SiC oxidation, initiating a cyclic reaction where H reacts with O to regenerate HO, posing a threat to rod lifespan.
Nitrogen (N) acts as a shield against SiC oxidation below 1200°C but reacts with SiC above 1350°C, causing decomposition.
Chlorine (Cl) completely deconstructs SiC, mandating cautious usage to preserve rod integrity.
Fragility: Silicon carbide rods are hard and brittle; they demand careful handling to prevent damage during transport and use.
Heating Zone Length: Ensure the heating section aligns with the furnace chamber's width. Extending it into the furnace wall may lead to structural damage.
Cold End Length: The cold end must match the furnace wall thickness plus 50-150 mm of exterior extension for efficient cooling and secure clamping.
Furnace Hole Diameter: Should be precisely configured to ensure optimal performance and safe operation in high-temperature settings. 1.4-1.6× Ensure the cold end's outer diameter is appropriately accommodated. Using tight holes or filler materials may hamper the thermal expansion process, leading to breakage. It is crucial to install rods in a way that allows them to... achieve a full 360° rotation.
Spacing Requirements:
Keep a safe distance from heated materials or furnace walls, maintaining at least ≥ 3× the heating zone diameter for optimal performance.
Ensure center-to-center spacing between rods is at least ≥ 4× the heating zone diameter to prevent overheating.
Electrical Connections must be precise, as improper connections increase contact resistance and elevate the risk of rod cracking.
Resistance Matching: Prior to usage, it is advisable to group rods that have similar resistance values.
ns: Utilize aluminum braids or foil to securely connect cold ends to the main circuit. Ensure all clamps are securely tightened.
Furnace Preheating: Before activating new or long-dormant furnaces, preheat using old rods or alternative heat sources to minimize stress.
Storage: Maintain rod dryness as moisture negatively impacts the cold end's aluminum layer, potentially causing degradation.
Voltage Control: Implement a voltage regulator, initially setting it at 50% of the operating voltage. Gradually increase the voltage to avoid thermal shock and ensure longevity.
Operating Limits:
Optimize surface load and temperature parameters for efficient operation.
Maximum temperature capability: ≤1650°C.
Prevent chemical reactions by avoiding use in corrosive gas environments.
Replacement: When replacing rods, use those with similar resistance values or consider replacing the entire set. Partially-used rods may be reused if resistance levels are appropriate.
Avoid Molten Metal: Steer clear of contact with molten metal to prevent rod breakage.
Avoid Alkalis: Alkali metals and oxides are corrosive and can deteriorate rod integrity.
Regular Checks: Routinely monitor amperage, voltage, and temperature, inspecting for any:
Loose or oxidized clamps,
Rod fractures,
Uneven heating, such as red-hot zones.
| Property | Value |
|---|---|
| Bulk Density | 5.5 g/cm³ |
| Flexural Strength | 15-25 kg/cm² |
| Vickers Hardness | (HV) 570 kg/mm² |
| Porosity | 7.4% |
| Water Absorption | 1.2% |
| Thermal Elongation | 4% |
In high-temperature oxidizing atmospheres, silicon molybdenum rods develop a protective quartz (SiO) coating, preventing further oxidation. At temperatures exceeding 1700°C, this layer melts, but it regenerates with continued use in oxidizing conditions.
Important Note: The remarkable Silicon Molybdenum rods should be used with caution, as they are not suitable for prolonged exposure in the 400-700°C range. Operating within these temperatures can lead to low-temperature oxidation, transforming these rods into powder and diminishing their effectiveness.
| Atmosphere | Continuous Use Temp. | Short-term Max Temp. |
|---|---|---|
| NO, CO, O, Air | 1700°C | 1800°C |
| He, Ar, Ne | 1650°C | 1750°C |
| SO | 1600°C | 1700°C |
| CO, N | 1500°C | 1600°C |
| Moist H | 1400°C | 1500°C |
| Dry H | 1350°C | 1450°C |
Silicon molybdenum (Si-Mo) rods are known for their durability at elevated temperatures, with a slight softening when exceeding 1500°C. However, they become hard and brittle when cooled. To effectively manage thermal stresses and allow for the natural expansion and contraction of the material, a free-hanging vertical installation is highly recommended. This approach not only optimizes performance but also allows for convenient hot replacement of rods without the need for full furnace cooling, ensuring continuous and efficient operation.
Furnace Lining Material
Utilize corundum bricks featuring FeO content <1%. A higher FeO content may react with the protective SiO layer, forming detrimental low-melting silicates, which can significantly speed up rod degradation.
Cold-End Sealing
Prevent hot gas leakage from cold ends as it increases heat loss and poses a risk of damaging conductive clamps and leads. For optimal insulation, choose asbestos clamps
to ensure maximum efficiency and safety.
Handling Fragility Si-Mo rods are inherently brittle
and possess low flexural strength. To prevent damage, avoid any impacts during installation. Ensure the security of asbestos/ceramic clamps before attaching conductive straps.Refrain from overtightening
Mounting with Insulating Bricks
Employ foamed corundum split bricks to support rods, effectively minimizing mechanical stress during both installation and removal.
Furnace Roof Installation
Place rod-mounted bricks into pre-cut slots on the furnace roof for a secure fit. Extend bricks beyond the roof surface to facilitate easier disassembly whenever necessary.
Conductive Strap Connection
Securely attach straps to pre-installed brackets. Ensure straps are free from tension and avoid unnatural bends to prevent any undue stress.
Anti-Sagging Measure
Apply a layer of refractory mortar (water glass-based) to joints, effectively securing asbestos clamps and countering thermal expansion-induced sagging.
Positioning Clearances
Heating zone taper: Maintain a clearance of 25-30 mm from furnace walls for optimal performance.
Cold ends: Extend by 75 mm above the furnace roof to ensure safety.
Lower heating end: Maintain a clearance of ≥50 mm from the furnace floor to prevent overheating.
Spacing Between Rods
Ensure a sufficient gap between rods for efficient operation and heat distribution. Ensure precise operation with our New SiC Heating Rods Molybdenum Disilicide Heating Element featuring a center-to-center distance that meets or exceeds rod spacing specifications, providing optimal performance and reliability..
Gravity Balance
Achieve unparalleled stability with our meticulously engineered balance weight distribution at both cold ends and wiring parts, guaranteeing flawless operation and unmatched durability. This innovative design effectively prevents bending of the heating section, ensuring long-lasting efficiency and superior performance.
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