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Corrosion Resistant Ceramics - Chemical Processing
Hexoloy® and Crystar® RB silicon carbide resist damage from acids, alkalis, and oxidizing gases thanks to their dense, non-porous structure. This makes them reliable choices for components in chemical reactors, gas scrubbers, and semiconductor processing equipment.
Hexoloy® sintered silicon carbide has been successfully used in chemical processing applications for over 30 years. It has been used in a wide range of applications including:
- Seal face and seat in mechanical seals used in pumps
- Tubes in shell and tube heat exchangers
- Thermowell protection tubes
- Valve lining for handling mining slurries
- Nozzles
- Sparger tubes
- Impellers for mixing
- Raschig rings
- Chemical reactor vessels
Hexoloy® silicon carbide products exhibit excellent corrosion resistance in contact with liquid and gaseous chemicals with a wide range of pH values. These products also offer low friction coefficients, excellent wear resistance, high strength and high thermal conductivity. Hexoloy® sintered silicon carbide sets the standard for the most effective ceramic material for chemical corrosion resistance. -
Corrosion Resistance Of Different Material Against Chemicals
Test Environment* Corrosive Weight Loss (mg/cm2 yr) Conc. Reagent (Wt%) Temp.
(°C)Hexoloy® SA
(No Free SiC)Reaction Bonded SiC
(12% SiC)Tungster Carbide
(6% Co)Aluminium Oxide
(99%)98% H2SO4 100 1.8 55.0 >1,000 >65.0 50% NaOH 100 2.6 >1,000 5.0 75.0 53% HF 25 <0.2 7.9 8.0 20.0 85% H3PO4 100 <0.2 0.5 >1,000 7.0 45% KOH 100 <0.2 >1,000 3.0 60.0 25% HCI 70 <0.2 0.9 85.0 72.0 10% HF plus 57% HNO3 25 <0.2 >1,000 >1,000 16.0 *Test Time: 125 to 300 hours of immersion testing, continuously stirred.
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Key Products
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FAQ
Hexoloy® sintered silicon carbide is virtually inert to corrosion from a wide range of chemicals, whereas most other ceramic materials demonstrate solubility over time.
Sintered silicon carbide can be used in a number of key components, including:
- Mechanical seal faces and rings for pumps
- Tube and tube-sheets for shell and tube heat exchangers
- Chemical reactor vessels
- Valve linings Nozzles
- High temperature reactor packing
Hexoloy® sintered silicon carbide has been successfully used in corrosive environments at temperatures up to 1,500°C. It is important to consider environmental chemistry and thermomechanical factors before designing process components with silicon carbide ceramics.
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