Products Description
As a premier silicon carbide material, pressureless sintered silicon carbide pottery represents a class of advanced engineering ceramics. Utilizing a process that achieves densification at high temperatures without external pressure, it is a key manufacturing technology. This ceramic is characterized by its exceptional hardness, superior thermal stability, remarkable wear and corrosion resistance, and excellent thermal shock resistance. These properties make it a material of choice for demanding applications. Furthermore, its capability for being formed into complex shapes while maintaining high performance offers outstanding cost-effectiveness.
Core Properties and Parameters
The properties of pressureless sintered boron carbide depend on raw material purity, sintering aids, and process technology. Its typical performance parameters range as follows:
Physical and Mechanical Properties:
- Density: 2.45 - 2.55 g/cm³ (95% - 98% of theoretical density).
- Hardness: Microhardness (HV) of 28 - 35 GPa, Mohs hardness ~9.5, making it an extremely excellent wear-resistant material.
- Flexural Strength: 300 - 450 MPa. Strength values are significantly influenced by defects and grain size.
- Fracture Toughness: 2.5 - 3.5 MPa·m¹/². Relatively low, which is the primary manifestation of its brittleness.
- Elastic Modulus: 400 - 450 GPa, indicating extremely high rigidity.
- Poisson's Ratio: Approximately 0.17 - 0.20.
Thermal Properties:
- Melting Point: Extremely high, approximately 2450°C.
- Thermal Conductivity: 30 - 40 W/(m·K). Possesses good thermal conductivity.
- Coefficient of Thermal Expansion: 4.5 - 5.5 × 10⁻⁶ /K (20-1000°C). Relatively low, contributing to good thermal shock resistance.
- High-Temperature Resistance: Can be used long-term in inert or reducing atmospheres up to 1400°C and above.
Chemical and Nuclear Properties:
- Chemical Stability: Very stable at room temperature, resistant to acid and alkali corrosion. Prone to reaction with strong oxidizing agents at high temperatures.
- Neutron Absorption Cross-section: Possesses an exceptionally high thermal neutron absorption cross-section of up to 600 barns, making it an excellent neutron-absorbing material. Furthermore, it does not produce highly radioactive secondary products after absorption.
Electrical Properties:
- Electrical Resistivity: 0.1 - 10 Ω·cm at room temperature. It is a p-type semiconductor, and its resistivity decreases with increasing temperature, making it suitable for high-temperature thermoelectric elements.
Product Application
Leveraging its unique combination of properties, pressureless sintered boron carbide finds applications in several high-tech fields:
- Ballistic Armor: One of its primary applications. Utilizing its extreme hardness and relatively low density, it is used to manufacture lightweight composite armor plates (e.g., ballistic inserts, helicopter seat armor, armored vehicle liners) for protection against armor-piercing projectiles and fragments.
- Wear-Resistant Components: Used for wear parts in harsh environments, such as sandblasting nozzle tips, slurry pump seal rings, bearings, grinding media, and mechanical seals. Its service life far exceeds that of cemented carbides and alumina ceramics.
- Nuclear Industry: Serves as a neutron absorption and control material for manufacturing control rods, regulating rods, safety rods in nuclear reactors, and neutron shielding panels in nuclear waste storage.
- Industrial Nozzles: Used as nozzles for high-pressure waterjet cutting machines. Its extreme wear resistance helps maintain cutting precision and significantly extends service life.
- Chemical and Metallurgical Industries: Employed as high-temperature and corrosion-resistant components, such as thermocouple protection tubes, high-temperature furnace linings, and evaporation boats.
Certificates and honors
The company has been awarded the title of a national high-tech enterprise and is a leading talent project in Shaoxing City's "Land of Scholars". It has an outstanding expert research team composed of professors and doctors. The experts are respectively engaged in the research of advanced ceramic materials and components such as silicon carbide, high-purity silicon carbide, boron carbide, diamond silicon carbide, yttrium oxide, aluminum oxide, and aluminum nitride. They have applied for over 30 Chinese patents. We possess advanced technical processes and have mastered processes such as sintering, molding, grinding, CNC, laser drilling, grinding and polishing. We can customize various ceramic products according to customer requirements.
factory strength
The company has been awarded the title of a national high-tech enterprise and is a leading talent project in Shaoxing City's "Land of Scholars". It has an outstanding expert research team composed of professors and doctors. The experts are respectively engaged in the research of advanced ceramic materials and components such as silicon carbide, high-purity silicon carbide, boron carbide, diamond silicon carbide, yttrium oxide, aluminum oxide, and aluminum nitride. They have applied for over 30 Chinese patents. We possess advanced technical processes and have mastered processes such as sintering, molding, grinding, CNC, laser drilling, grinding and polishing. We can customize various ceramic products according to customer requirements.
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