When companies look for strong materials to resist wear, two of the most common choices are tungsten carbide and silicon carbide.
Both are very hard, both are reliable, and both are used in many industries such as 採掘, 石油・ガス, and chemical processing.
This article compares them side by side. We will look at their properties, strengths, weaknesses, and ideal applications so that decision-makers can make the right choice.
タングステンカーバイドとは何ですか?
Tungsten carbide (WC) is made by combining tungsten and carbon, usually with a metallic binder such as cobalt.
It is one of the hardest materials used in industry.
What Is Silicon Carbide?
Silicon carbide (SiC) is a ceramic compound of silicon and carbon. It is also very hard but much lighter than tungsten carbide.
Hardness and Mechanical Strength
Tungsten carbide: Very hard and also tough, resists cracks under impact.
Silicon carbide: Very hard but brittle, can break if subjected to shock.
Decision: If your application faces impact and abrasion, tungsten carbide is better.
Density and Weight
One of the biggest differences is weight:
Tungsten carbide: About 15 g/cm³, extremely heavy and strong.
Silicon carbide: About 3.2 g/cm³, much lighter.
This makes tungsten carbide suitable for stable, heavy-duty applications, while silicon carbide is better when weight reduction matters.
耐摩耗性
Both are excellent against wear, but in different ways:
Tungsten carbide: Best against abrasive and erosive particles.
Silicon carbide: Best against chemical wear and corrosive media.
耐熱性
Tungsten carbide: Stable up to 600–700°C.
Silicon carbide: Can operate above 1000°C.
This makes SiC more reliable in extreme heat conditions.
耐腐食性
Tungsten carbide: The cobalt binder can corrode in acids and chemicals.
Silicon carbide: Almost inert, outstanding resistance against corrosion.
For chemical plants and pumps, silicon carbide has the clear advantage.
Cost Considerations
Tungsten carbide: Higher cost because tungsten and cobalt are expensive.
Silicon carbide: Lower raw material cost, but brittleness can add risk.
Final cost depends on lifetime and downtime savings.
代表的な用途
Key Takeaways for Decision-Makers
Choose tungsten carbide if your equipment faces abrasion and impact.
Choose silicon carbide if your equipment faces corrosion and high temperatures.
Some companies use both materials together for best performance.
結論
Both tungsten carbide and silicon carbide are excellent materials for wear parts, but they serve different needs.
Decision-makers must evaluate their specific working environment before choosing. A well-matched material will increase service life, reduce downtime, and lower total cost of ownership.
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