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China, Chinese Advanded Laboratory Versatile Crucible Quartz Tube1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Products Details Supplier Manufacturer price list catalog
CrucibleCrucible QuartzCrucible Quartz Tube
HENAN RUNJING INSTRUMENT EQUIPMENT CO.,LTD
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Product Description Corundum Furnace TubePurpose:The Corundum Furnace Tube, an essential component of advanced experimental electric furnaces, performs multiple crucial roles. It primarily isolates the heating elements from the test materials, effectively encloses the heating zone, and securely holds the test substances. This indispensable element finds extensive applications in high-temperature analyses and is a mainstay in a variety of industries including coal testing, metallurgical powder analysis, as well as in chemical and glass laboratory equipment.Material & Manufacturing:Expertly crafted from premium fused alumina, Corundum Furnace Tubes are available in two distinct types to suit diverse needs:Ultra-fine powder-bondedClay-bondedTailored to user specifications, these tubes can be customized to meet specific requirements, including operating temperature thresholds, enhanced wear resistance, and superior chemical corrosion resistance, ensuring a perfect fit for your application.Dimensions:Outer diameter: 15-200 mmLength: 100-2000 mmWall thickness: 3-15 mmUsage Guidelines:To ensure optimal performance and longevity of the Corundum Furnace Tube within high-temperature testing equipment, adhere to stringent protocols: Embrace gradual heating and cooling techniques This careful approach minimizes internal stress resulting from thermal expansion and contraction, effectively reducing the risk of cracking and significantly extending the service life of your tubes.Corundum CrucibleComposition:The Corundum Crucible is engineered from high-quality porous fused alumina, delivering outstanding durability and exceptional heat resistance.Applications:This robust crucible is perfectly suited for melting samples in the presence of weak alkaline fluxes such as anhydrous NaCO, ensuring precise and reliable results.Not suitable for use with strong alkaline fluxes like NaO, NaOH, or acidic fluxes such as KSO, safeguarding the integrity of your experiments.Product Performance:Boasting an impressive 99.70% Corundum composition,Max short-term temperature: 1800¡ãCThe crucible demonstrates remarkable mechanical strength in both oxidizing and reducing atmospheresensuring reliable performance.With high thermal conductivity and low thermal expansion, it offers unparalleled efficiency.Operating range: 1650-1700¡ãCEnsures excellent high-temperature insulation &remains chemically inert up to 1700¡ãC in environments containing air, steam, hydrogen, and carbon monoxide, guaranteeing safety and reliability.99.35% CorundumMax short-term temperature: 1750¡ãCOperating range: 1600-1650¡ãCDemonstrates stability in oxidizing and reducing atmospheresto ensure consistent results.85.00% High-AluminaMax short-term temperature: 1400¡ãCOperating range: 1290¡ãCExhibits good insulation and mechanical strength in oxidizing and reducing atmospheresfor versatile applications.Delivers high thermal conductivity with low thermal expansion, optimizing performance.Remains chemically inert when exposed to air, steam, hydrogen, and carbon monoxide, ensuring safety and longevity.Perfectly tailored for enduring and reliable performance amidst consistently stable temperature conditions.Premium Quartz Glass TubeQuartz glass tubes represent a pinnacle of industrial-grade glass technology, crafted from silicon dioxide (SiO). This remarkable material boasts a host of extraordinary physical and chemical attributes, including:Unmatched High-Temperature ResistanceSoftening point reaching approximately 1730¡ãCSustained use: Capable of enduring temperatures up to 1100¡ãCShort-term peak temperature tolerance: a remarkable 1450¡ãCExceptional Corrosion ResistanceAlmost entirely inert to all acids excluding hydrofluoric acid (HF).Acid resistance that is:30 times greater than that of ceramic materialsand 150 times greater than that of stainless steelExemplary high-temperature chemical stability, a standard unattainable by other engineering materials.Remarkable Thermal StabilityCharacterized by an exceedingly low thermal expansion coefficient.Endures sudden and dramatic temperature fluctuations (such as being heated to 1100¡ãC and then plunged into room-temperature water without fracturing).Outstanding Optical TransparencyProvides superior light transmission across the UV to infrared light spectrum.Visible light transmission rate: exceeding 93%UV spectrum light transmittance: up to and beyond 80%Excellent Electrical InsulationElectrical resistivity: 10,000 times superior to that of standard glass materials.Maintains exceptional insulation properties even under elevated temperatures.Quartz CrucibleApplication & FeaturesCan withstand temperatures up to an impressive 1450¡ãC, and is available in both transparent and opaque forms .Key Advantages: Exceptionally high purity, outstanding temperature resilience, large size with precise accuracy, superior thermal insulation, cost-efficient, and consistently reliable quality.Chemical Compatibility NotesNon-compatible with hydrofluoric acid (HF) .At elevated temperatures, easily reacts with caustic alkalis and alkali metal carbonates.Optimal Fluxes for UsePerfect for sample melting using potassium pyrosulfate (KSO) or potassium bisulfate (KHSO).Additionally compatible with sodium pyrosulfate (NaSO, pre-dried at 212¡ãC) for meticulous sample processing.Quartz Crucible Application & Maintenance GuidelinesPrimary chemical composition: Silicon dioxide (SiO).Our Laboratory Versatile Crucible Quartz Tube - RJ Brand is expertly designed to remain chemically inert to most acids, with the exception of HF, but it will react with caustic alkalis and alkali metal carbonates.This product boasts excellent thermal stability, ensuring dependable performance even under fluctuating temperature conditions.-can be heated directly over a flame, offering flexibility and ease of use in various laboratory settings.Fragile like glassware, the product demands the same gentle handling as you would give to delicate glass instruments.-requires careful handling. Ensure safe operation by treating it with the gentleness it deserves to maintain its integrity.Permissible fluxes:Ideal for use with fluxes such as KHSO (potassium bisulfate) and NaSO (sodium pyrosulfate, pre-dried at 212¡ãC), offering versatility in your experimental processes.With a maximum melting temperature of 800¡ãC, this product is built to withstand substantial heat.Handling PrecautionsBrittle and fragile-handle with care to avoid breakage. Proper handling ensures longevity and performance.CleaningCan be cleaned with dilute inorganic acids (except HF), enabling easy maintenance and upkeep..Material Characteristics: Characterized by its hard and brittle nature, the product is resistant to thermal shock and maintains its shape even at high temperatures. Other physical properties include:Density: 3.2 g/cm3Mohs Hardness: 9.5, showcasing its incredible durability.Specific Heat: 0.17 kcal/kg¡¤¡ãC, offering excellent thermal regulation.Thermal Conductivity: 20 kcal/m¡¤h¡¤¡ãC, supporting efficient heat distribution.Linear Expansion Coefficient: 5¡Á10 (m/¡ãC), reflecting its stable expansion under heat.Chemical PropertiesSilicon carbide rods exhibit remarkable chemical stability and robust resistance to acids, though they can be corroded by alkaline substances at elevated temperatures.When used long-term above 1000¡ãC, silicon carbide rods react with oxygen and water vapor, which can affect their durability. The reactions are:SiC + 2O ¡ú SiO + COSiC + 4HO ¡ú SiO + 4H + COThese reactions progressively increase the SiO content in the rod, resulting in higher resistance and potential aging.Excessive water vapor can accelerate SiC oxidation, while the produced H interacts with O to regenerate HO, perpetuating a cycle that could reduce the rod's lifespan.Nitrogen (N) prevents SiC oxidation below 1200¡ãC but reacts with SiC above 1350¡ãC, decomposing it and compromising its structural integrity.Chlorine (Cl) completely decomposes SiC, making careful environmental consideration crucial.Usage PrecautionsFragility: Silicon carbide rods, while hard and brittle, should be shielded from strong impacts or vibrations to prevent any damage during transport and handling.Heating Zone Length: The heating section should align precisely with the furnace chamber's width to prevent damage to the furnace wall.Cold End Length: Ensure the cold end matches the furnace wall thickness plus 50-150 mm of additional extension outside the wall for optimal cooling and secure clamping.Furnace Hole Diameter: Should be designed to accommodate the dimensions of the rod, ensuring a snug and secure fit. 1.4-1.6¡Á the cold end's outer diameter for optimal performance. Avoid restrictions from tight holes or filler materials to prevent thermal expansion issues and possible breakage. Ensure the installation allows rods to expand freely. 360¡ã rotation for uniform heating and enhanced efficiency..Spacing Requirements:Maintain a distance to heated materials or furnace wall of at least ¡Ý 3¡Á the heating zone diameter to promote safe and efficient operation.Ensure center-to-center spacing between rods is at least ¡Ý 4¡Á the heating zone diameter to prevent overheating and maintain uniformity.Electrical Connections:A secure connection minimizes contact resistance and reduces the risk of rod cracking.Resistance Matching: Before operation, group rods with similar resistance valuesto ensure consistent performance.Connections: Use quality aluminum braids or foil for connecting cold ends to the main circuit, ensuring clamps are securely tightened.Furnace Preheating: Preheat new or long-idle furnaces using older rods or alternative heat sources to optimize initial performance.Storage: Store rods in a dry environment. Moisture can degrade the cold end's protective aluminum layer.Voltage Control: Implement a voltage regulator, starting at 50% of operating voltage, and gradually increase to prevent thermal shock.Operating Limits:Optimize surface load and temperature for ideal performance.Max temperature: Maintain at ¡Ü1650¡ãCto prevent damage.Avoid exposing rods to corrosive gas environments to prevent unwanted chemical reactions.Replacement: Replace rods with those of similar resistance or consider replacing the entire set. Partially used rods can be reused if resistance remains suitable.Avoid Molten Metal: Contact with molten metal leads to rod breakage. Exercise caution.Avoid Alkalis: Alkali metals and oxides can corrode rods, impairing their function.Regular Checks: Regularly monitor amperage, voltage, and temperature. Inspect for signs of wear including:Loose or oxidized clamps,Rod fractures,Uneven heating, such as red-hot zones.Main Applications:Silicon molybdenum (Si-Mo) heating elements are indispensable across various industries such as metallurgy, steelmaking, glass, ceramics, refractory materials, crystal growth, electronics, and semiconductor research and manufacturing. They play a crucial role in producing high-performance precision ceramics, advanced synthetic crystals, precision structural cermets, fiberglass, optical fibers, and premium alloy steels, ensuring exceptional quality and efficiency.PropertyValueBulk Density5.5 g/cm3Flexural Strength15-25 kg/cm2Vickers Hardness(HV) 570 kg/mm2Porosity7.4%Water Absorption1.2%Thermal Elongation4%Chemical Properties of Silicon Molybdenum Rods:In high-temperature oxidizing atmospheres, silicon molybdenum rods form a protective quartz (SiO) layer that prevents further oxidation. If the element temperature exceeds 1700¡ãC, this quartz layer melts but can regenerate in oxidizing conditions, providing a self-healing protective measure.Important Note: For optimal performance and longevity, refrain from using silicon molybdenum rods continuously within the 400-700¡ãC range. This temperature zone fosters low-temperature oxidation, leading to a compromised element that deteriorates into a powdery form.Maximum Operating Temperatures in Different Atmospheres: Explore the full potential of your silicon molybdenum rods across diverse environments to ensure exceptional performance.AtmosphereContinuous Use Temp.Short-term Max Temp.NO, CO, O, Air1700¡ãC1800¡ãCHe, Ar, Ne1650¡ãC1750¡ãCSO1600¡ãC1700¡ãCCO, N1500¡ãC1600¡ãCMoist H1400¡ãC1500¡ãCDry H1350¡ãC1450¡ãCInstallation Precautions for Silicon Molybdenum Rods: Maximize the efficiency and lifespan of your equipment with meticulous installation practices.Silicon molybdenum (Si-Mo) rods exhibit a fascinating balance of properties, softening slightly at high temperatures (above 1500¡ãC) while becoming hard and brittle as temperatures drop. To reduce thermal stress and accommodate the complexities of thermal expansion and contraction, a free-hanging vertical installation is the preferred method. This approach also enables hot replacement of rods with ease, eliminating the need to wait for furnace cooling, thus maintaining operational efficiency.Key Installation Guidelines: Follow these essential steps to ensure the secure and effective installation of your silicon molybdenum rods.Furnace Lining Material: Choose materials wisely to support the longevity of your equipment.Use only premium corundum bricks with a FeO content of less than 1%.Higher FeO content can aggressively react with the protective SiO layer, forming low-melting silicates that expedite rod degradation.Cold-End Sealing: A crucial component for maintaining energy efficiency and protecting your equipment.Prevent hot gas leakage from cold ends, which increases heat loss and may jeopardize the integrity of conductive clamps or leads. Employ asbestos clamps as the preferred choice for superior insulation.Handling Fragility: Master the art of careful handling for extended rod life.Silicon molybdenum rods are inherently brittle and possess low flexural strength. Avoid any form of impact during installation to protect the delicate structure of the rods.Secure all components, including asbestos or ceramic clamps, before undertaking the connection of conductive straps. Do not overtighten any fittingsto prevent unnecessary stress.Mounting with Insulating Bricks: Optimize installation practices to mitigate mechanical stress.Utilize foamed corundum split bricks to house rods, effectively minimizing mechanical stress during both installation and removal.Furnace Roof Installation: Enhance your setup by ensuring a secure and efficient installation.Insert rod-mounted bricks into pre-cut furnace roof slots, and extend bricks beyond the roof surface for a seamless and easier disassembly process.Conductive Strap Connection: Achieve a flawless connection with thoughtful planning.Connect straps to pre-installed brackets with care. Avoid any tension or unnatural bends, as these could potentially induce stress and reduce the effectiveness of the connection.Anti-Sagging Measure: Fortify your system against the challenges of thermal expansion.Apply a refractory mortar (water glass-based) to joints, ensuring asbestos clamps are firmly secured to counteract any drooping caused by thermal expansion.Positioning Clearances: Precision is key to achieving optimal performance.Heating zone taper:Maintain a clearance of 25-30 mm from furnace walls for efficient heat distribution.Cold ends:Extend no less than 75 mm above the furnace roof for optimal operation.Lower heating end:Ensure a minimum clearance of ¡Ý50 mm from the furnace floor to guarantee safe and efficient heating.Spacing Between Rods: Establish proper spacing for enhanced system performance.Ensure adequate spacing to support the effective and efficient operation of your silicon molybdenum rods. Ensure a superior laboratory experience with our Laboratory Versatile Crucible Quartz Tube, RJ Brand, featuring a center-to-center distance that meets or exceeds rod spacing specifications..Gravity BalanceExpertly engineered for optimal balance weight distribution, this design ensures even distribution at both cold ends and wiring parts, effectively preventing any bending in the vital heating section and maintaining product integrity.
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