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Silicon Carbide Materials Guide
Understanding Silicon Carbide Ceramics, Bond Types, and Material Selection
Whether you're replacing steel, rubber, refractory, or an existing ceramic component, understanding how silicon carbide materials differ is the first step toward selecting the right solution.
understanding the material
What is Silicon Carbide?
Silicon carbide (SiC) is one of the world's hardest engineered materials. Originally discovered in 1891, it has become the material of choice for industrial components exposed to severe abrasion, high temperatures, corrosive chemicals, and thermal shock.
Compared to traditional materials like hardened steel, cast iron, rubber, or refractory, products made of silicon carbide can significantly extend service life while reducing maintenance, downtime, and replacement costs.
From Accidental Discovery to Industrial Standard
Inventor Edward Acheson was attempting to synthesize artificial diamonds by heating a mixture of clay and carbon in an electric furnace. He didn't get diamonds — instead, he found blue-black crystals harder than nearly anything else known at the time. He'd created silicon carbide, one of the hardest synthetic materials ever produced, and named it Carborundum.
More than 130 years later, that same combination of extreme hardness, heat resistance, and chemical stability is why silicon carbide protects the highest-wear components in mining, power generation, and heavy industry today.
The Real Differentiator
It's All About the Bond
Every silicon carbide component begins with the same silicon carbide grain. What determines performance isn't the grain itself, it's the bond that holds those grains together. Different bonding methods produce dramatically different combinations of wear resistance, thermal shock resistance, corrosion resistance, strength, machinability, and cost. Understanding those differences is the key to selecting the right material for your application.
SiC grains with silicon nitride bond phase, formed by nitrogen penetration during firing.
SiC grains bonded by free silicon infiltrated into the part during firing.
SiC grains fused directly to each other at extreme temperature, with no separate bonding phase.
Clay minerals are mixed with SiC grains and water, formed under pressure and dried or fired to create strong, economical components for less extreme environments.
SiC grains are mixed with oxide-forming additives and fired at high temperatures, creating an oxide ceramic bond that delivers excellent strength and chemical stability.
Silicon Carbide Products focuses on Nitride Bonded, Reaction Bonded, and Sintered Silicon Carbide — the three that consistently deliver the performance our customers' applications demand. Each is engineered for a different balance of thermal shock resistance, chemical resistance, and shape complexity, so you get the right material for your application.
Full Survey
How the Bond Types Compare
A property-by-property snapshot for engineers evaluating silicon carbide bond types side by side.
SCP focus grade, best value
Where it started
A Material Discovered by Accident
In 1891, inventor Edward Acheson was attempting to synthesize artificial diamonds by heating a mixture of clay and carbon in an electric furnace. He didn't get diamonds — instead, he found blue-black crystals harder than nearly anything else known at the time. He'd created silicon carbide, one of the hardest synthetic materials ever produced, and named it Carborundum.
More than 130 years later, that same combination of extreme hardness, heat resistance, and chemical stability is why silicon carbide protects the highest-wear components in mining, power generation, and heavy industry today.
When should I replace metal or rubber with silicon carbide?
Silicon carbide is commonly selected when traditional materials experience excessive wear, frequent maintenance, high operating temperatures, chemical attack, or premature failure. While every application is different, silicon carbide often delivers substantially longer service life in abrasive and high-temperature environments.
How do I know which SCProbond™ material is right?
Every application has unique operating conditions. Wall thickness provides the starting point, but abrasion, impact, corrosion, operating temperature, and component geometry all influence the final recommendation. SCP reviews these factors before recommending the appropriate SCProbond™ material.
Is all silicon carbide the same?
Absolutely not. Different manufacturing methods create significant differences in strength, density, thermal shock resistance, corrosion resistance, and long-term durability. Choosing the right supplier is just as important as choosing the right material.
Can existing metal components be converted to silicon carbide?
SCP regularly manufactures custom silicon carbide components designed to replace worn metal assemblies, improving wear life while reducing maintenance and replacement frequency. During the quoting process, SCP reviews each application to determine the most appropriate manufacturing approach.
Nitride Bonded Silicon Carbide (NBSiC)
During firing, nitrogen penetrates the part and reacts with silicon carbide to form a silicon nitride bond around every SiC grain — a bond strong enough to hold that grain in place through years of abrasive service, thermal cycling, and molten metal contact.
Complex Geometry
No bonding phase to attack means outstanding resistance to acids and alkalis.
Low Thermal Expansion
Maintains performance up to 2,912°F (1,600°C).
Sliding Abrasion Resistance
Withstands the most severe sliding abrasion applications.
Standard Wall
SCProbond™ N
For walls 3/8" - 3/4" thick. Excellent thermal shock resistance and non-wetting to non-ferrous molten metals.
Thick Wall
SCProbond™ TN
For walls over 3/4". Complete nitriding through thicker sections keeps wear resistance uniform across the whole part.
Thin Wall
SCProbond™ TW
For walls under 3/8". Maintains abrasion resistance in a thinner casting for reduced mass and faster heat transfer.
Oxidation use
SCProFrax™
Increased oxidation resistance and excess oxygen 900 °C to 1100 °C.
Reaction Bonded Silicon Carbide
Reaction bonded SiC forms when molten silicon infiltrates a porous SiC preform, reacting with residual carbon to fill the pore structure and bind the grains. The result is a near-zero-porosity material with very low thermal expansion, giving it excellent dimensional stability and tight tolerances at extreme temperature.
Near-Zero Porosity
Dense structure resists chemical penetration and mechanical wear.
High Mechanical Strength
Strong use-case for structural components
Precision Fit
Well suited to components with critical dimensional requirements.
Sintered Silicon Carbide (SSIC)
Sintered SiC has no separate bonding phase at all, fine SiC powder is pressed and fired at extreme temperature until the grains fuse directly to one another. Without a secondary phase to attack, sintered SiC resists chemical corrosion better than almost any other ceramic, even in aggressive acids and alkalis at high temperature.
Extreme Corrosion Resistance
No bonding phase to attack means outstanding resistance to acids and alkalis.
High-Temperature Stability
Maintains performance up to 2,912°F (1,600°C).
Extreme Wear Resistence
Withstands the most severe sliding abrasion applications.
Compare Grades
The SCProbond™ Grades
A side-by-side look at how each grade performs. Select a grade below for full technical data.
SCProbond™ N →
SCProbond™ TN →
SCProbond™ TW →
SCProFrax™ →
SCProbond™ R →
SCProbond™ SSIC →
Choosing the Right Silicon Carbide Starts with Understanding the Application
Every application places different demands on a component—from abrasion and thermal cycling to corrosion, wall thickness, dimensional requirements, and expected service life.
Tell us about your operating conditions, and we'll help identify the material best suited for your application.