Assay Equipment Accessories & Consumables
Silicon Carbide Sulfur and Carbon Analysis Combustion Tube
Item Number : KT-RG
Price varies based on specs and customizations
- Maximum Operating Temperature
- 1450°C (Continuous) / 1500°C (Peak)
- Material Composition
- Recrystallized Silicon Carbide (SiC ≥ 98.5%)
- Bulk Density & Porosity
- Density ≥ 2.65 g/cm³ | Porosity ≤ 12.0%
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Product Overview
This high-performance silicon carbide combustion tube is purpose-engineered to serve as the critical high-temperature heating and reaction vessel in automated carbon and sulfur determinators. Manufactured from ultra-pure, high-density recrystallized silicon carbide, the component delivers exceptional thermal conductivity, rapid thermal ramp rates, and outstanding electrical stability during prolonged continuous testing cycles.
Designed to withstand intense oxidizing and corrosive environments, this tubular element is widely deployed across metallurgical smelting plants, quality inspection laboratories, geological testing facilities, and cement manufacturing operations. It provides an optimal, contamination-free chamber for the rapid, high-temperature combustion of steel, cast iron, non-ferrous alloys, ores, and carbon-bearing minerals.
Built to endure severe thermal cycling and direct exposure to fluxing accelerators, this unit minimizes devitrification, sagging, and deformation at sustained temperatures exceeding 1400°C. Its robust engineering ensures dependable baseline stability, extended operating life, and minimal furnace downtime in high-throughput analytical facilities.
Key Features
- Ultra-High Purity Silicon Carbide Matrix: Formulated from select recrystallized silicon carbide with greater than 98.5% purity, preventing sample cross-contamination while providing structural resilience at sustained operating temperatures up to 1450°C.
- Exceptional Thermal Shock Resistance: Engineered to endure violent temperature transitions and rapid oxygen purges without micro-cracking, spalling, or structural fatigue during repeated combustion cycles.
- Uniform Resistance and Balanced Heating: Precision hot-zone formulation provides consistent electrical resistivity across the entire active tube profile, eliminating localized hotspots and ensuring reproducible temperature gradients.
- Superior Corrosive Flux Tolerance: Dense outer and inner surfaces resist the aggressive chemical attack of volatile combustion byproducts, acidic gases, molten tin accelerators, and iron oxide splatters.
- Optimized High-Temperature Mechanical Rigidity: High flexural strength at extreme temperatures eliminates sagging, warping, and ovality changes, ensuring smooth sample boat insertion and automatic extraction.
- Controlled Low Surface Porosity: Specially treated microstructural density prevents gas permeation and moisture retention, enabling rapid chamber evacuation, sharp analytical peak resolution, and repeatable analytical readings.
- Low-Resistance Metallized Cold Ends: Aluminum-sprayed terminal contact zones ensure minimal contact resistance, preventing localized terminal heating and prolonging overall clamp and electrical lead service life.
- Predictable and Slow Oxidation Aging: Controlled oxidation kinetics preserve baseline furnace power efficiency over months of continuous use, dramatically reducing replacement frequency in continuous industrial testing regimes.
Applications
| Application | Description | Key Benefit |
|---|---|---|
| Ferrous Metallurgy Quality Assurance | Rapid combustion analysis of carbon and sulfur concentrations in carbon steel, stainless steel, cast iron, and high-strength ferroalloys. | Delivers fast oxidation kinetics and clean analytical peaks without flux corrosion or tube degradation. |
| Non-Ferrous Alloy Evaluation | Determination of trace sulfur and residual carbon impurities in copper, nickel, titanium, and aluminum master alloys. | Ensures negligible background blanks and excellent baseline stability for low-ppm elemental detection. |
| Mining and Geological Mineral Assays | High-throughput decomposition of sulfide minerals, iron ores, limestone, drill cores, and rare-earth concentrate samples. | Resists aggressive sulfur dioxide erosion and abrasive mechanical wear from aggressive molten slag residues. |
| Coal and Coke Fuel Testing | Rapid elemental combustion of coal, petcoke, graphite, and carbonaceous solid fuels for sulfur emission tracking and calorific calibration. | Provides stable, uniform high-temperature zones that accelerate complete sample burning without incomplete combustion residues. |
| Cement and Building Material Production | Precise monitoring of sulfate and carbonate fractions in raw meal, clinker, gypsum, and finished hydraulic cements. | Sustains continuous twenty-four-hour operating cycles with minimal thermal drift or unplanned element failure. |
| Commercial Testing Laboratories | High-capacity multi-matrix testing spanning contract analytical laboratories, research centers, and academic metallurgical institutes. | Maximizes tube service life across variable sample chemistries and multiple consecutive operational shifts. |
Technical Specifications
Material & Physical Properties
| Property | Value | Reference Standard / Condition |
|---|---|---|
| Material Base | Recrystallized Silicon Carbide (SiC) | Sintered High-Purity Refractory Ceramic |
| SiC Content | ≥ 98.5% | Chemical Purity Analysis |
| Bulk Density | ≥ 2.65 g/cm³ | Archimedes Principle |
| Apparent Porosity | ≤ 12.0% | ASTM C20 |
| Maximum Working Temperature | 1450°C (Continuous) / 1500°C (Peak) | Inert / Oxidizing Atmosphere |
| Cold Crushing Strength | ≥ 120 MPa | Ambient Temperature (20°C) |
| High-Temperature Flexural Strength | ≥ 95 MPa | Three-Point Bending at 1350°C |
| Thermal Expansion Coefficient | 4.8 × 10⁻⁶ / °C | 20°C to 1000°C Mean Value |
| Thermal Conductivity | 25 W/(m·K) | Measured at 1000°C |
| Atmosphere Compatibility | O₂, N₂, Ar, CO₂, Dry Air | Chemically Inert Under Routine Operating Fluxes |
Standard Dimensional Configurations
| Model Number | Outer Diameter (OD, mm) | Inner Diameter (ID, mm) | Heated Length (HL, mm) | Overall Length (OL, mm) | Nominal Resistance (Ω at 1050°C) |
|---|---|---|---|---|---|
| KT-RG-28 | 28 ± 0.5 | 20 ± 0.5 | 180 - 200 | 350 - 450 | 2.8 - 3.2 |
| KT-RG-30 | 30 ± 0.5 | 22 ± 0.5 | 200 - 220 | 400 - 500 | 2.5 - 2.9 |
| KT-RG-32 | 32 ± 0.5 | 24 ± 0.5 | 200 - 240 | 450 - 550 | 2.2 - 2.6 |
| KT-RG-35 | 35 ± 0.5 | 25 ± 0.5 | 220 - 260 | 500 - 600 | 1.9 - 2.3 |
| KT-RG-40 | 40 ± 0.8 | 30 ± 0.8 | 250 - 300 | 550 - 700 | 1.6 - 2.0 |
| KT-RG-45 | 45 ± 0.8 | 35 ± 0.8 | 280 - 350 | 600 - 800 | 1.3 - 1.7 |
| KT-RG-50 | 50 ± 1.0 | 40 ± 1.0 | 300 - 400 | 700 - 900 | 1.0 - 1.4 |
Electrical & Operating Guidelines
- Electrical Connection: Use braided aluminum or copper straps with stainless steel spring-loaded clamps. Ensure electrical contact zones are clean and free of slag or oxidation to avoid contact resistance spikes.
- Break-in Procedure: When installing a new component, ramp temperature gradually at 5°C to 10°C per minute up to 1050°C to allow outgassing and establish a stable surface silica protective film.
- Resistance Matching: When replacing multiple units in parallel or series configurations, select components with matched resistance tolerances within ±5% to ensure uniform thermal distribution.
- Combustion Flux Precautions: Position combustion boats centrally in the designated hot zone. Clean combustion splatter regularly using specialized ceramic scrapers to prevent localized chemical flux erosion.
Why Choose This Product
- Engineered Microstructural Density: Formulated via precision recrystallization sintering, our combustion tubes exhibit uniform grain morphology that resists internal oxidation and aggressive flux vapor attack significantly longer than commodity-grade refractory tubes.
- Tight Electrical Resistance Matching: Stringent factory resistance sorting guarantees that replacement elements match existing power supplies, transformer taps, and digital controllers without demanding tedious circuit rebalancing or recalibration.
- Superior Geometrical Straightness: Controlled radial tolerances and precise axial straightness ensure unhindered combustion boat entry and exit, preventing mechanical jams, boat tipping, and sudden tube breakage during automated sample handling.
- Verified Batch Consistency and Traceability: Every manufacturing lot undergoes comprehensive high-temperature electrical verification, dimensional verification, and ultrasonic density testing to ensure complete conformity to ISO 9001 standards.
- Comprehensive Dimensional Versatility: In addition to standard catalog configurations, custom tube lengths, extended heating zones, and specialized wall profiles can be manufactured to match proprietary furnace geometries.
Contact our technical engineering team today to receive a prompt quotation, confirm dimensional compatibility for your carbon and sulfur analyzer, or request a custom manufactured solution tailored to your operational requirements.
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