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Technical Data
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To Improve Your Operation and Save Money, the Choice Becomes Obvious...
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Metal Alloy Tubes All Eventually Fail Due To:
- Creep
- Melt Through
- Oxidation
- Corrosion
The end results are high maintenance costs and increased downtime.
In addition to poor life, the heat flux of conventional radiant tubes is also limited by low maximum temperature.
The alloy 600 tube depicted on the right was tested for less than one hour.
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Creep Test at 2462°F (1350°C)
The INEX tube on the left was tested for 360 hours.
(Tests conducted by Hi-Tech Ceramics, Alfred, NY.)
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The End Result of Using Conventional Materials is Increased Downtime and Maintenance Costs.
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(Test conducted by Pyronics Inc., Cleveland, OH.)
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Severe Thermal Shock Test for Silicon/Silicon Carbide Material
Test System ..... INBZ-1001
Input ..... 15,000 BTU/HR
N.G. @ 20% XS Air
Material ..... INEX Si-SiC
Total Cycles ..... 5
Average Heat Rate ..... 160°F/Min.
Average Cool Rate ..... 256°F/Min.
* The test on the left demonstrates the superior thermal shock resistance of the silicon/silicon carbide composite; Conventional Ceramic (Mullite) tubes failed after one cycle of this test.
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To Improve "Uptime" and Reduce Tube Replacement Costs (Both Labor & Material)
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Productivity
Furnace productivity can be improved by reducing recovery time. This is NOT possible with conventional materials because of their limited heat flux capabilities.
- Conventional Metal Alloy Tube - Less than 60 BTU/HR
- INEX Composite Tube - Greater than 200 BTU/HR (Routinely achieved without concern for Creep or Thermal Shock)
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For Processes Requiring Higher Temperatures (2450°F or Higher Heat Flux Rates), the Choice Becomes Obvious
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For Higher Temperature Capabilities and Decreased Costs, CRTs Provide the Capabilities of:
- 2450°F (1350°C) Maximum Tube Temperature
- Conventional Metal Alloy Tube < 60 BTU/hr/in2
- INEX Composite Tubes Heat Flux > 200 BTU/hr/in2 (Routinely achieved without concern for Creep or Thermal Shock)
- A unique dual phase, composite material of silicon/silicon carbide; specifically formulated for high performance and low cost
- Innovative, patented manufacturing process enabling the production of composite radiant tubes at a price competitive with convention metal tubes
- Reduction in furnace downtime(s), tube replacement(s), labor cost, cycle time; all of which attribute to lower operating expenses with the ability for higher temperature work
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Where Other Tube Materials Fail, INEX Composite Tubes Are the Obvious Choice.
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- For more technical insight on INEX CRTs, please Contact Us via E-mail, phone, or fax.
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Compiled Technical Data For INEX Composite Radiant Tubes (CRTs)
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INEX CRTs
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Micro Structure
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Bulk density (g/cm³)
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2.85
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Dark phase = SiC
Light phase = free Si
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Apparent porosity (Vol.%)
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0
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Modulus of rupture (MPa)
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78
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Compressive strengths (MPa)
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580
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Vickers hardness (MPa)
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SiC 25.000
Si 9.000
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Thermal expansion coefficient
20°-1000°C (1°C)
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4.2 x 10¯6
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Thermal conductivity (W/mK) 100°C
1280°C
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160
24
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Specific heat (J/kgK) RT 1280°C
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600
1200
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Limit of application (°C)
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1340
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Technical Documents
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