Silicon Nitride Ceramic Welding Positioning Block with High Thermal Conductivity 15 W/m.k and High Compressive Strength 488 Mpa for Industrial Ceramic Applications
Price:
FobShanghai usd 3.5-5/pc
MOQ:
1pcs
Delivery Time:
25-30 days subject to the clients' requirement and quantity
Brand:
BLM-kcf-1
Product Description
Silicon Nitride Ceramic Welding Positioning Block
Used for electronic appliances and textile machinery applications.
Material Description
Silicon nitride (Si₃N₄) ceramics is an inorganic non-metallic compound with strong covalent bonds. Its basic structural unit is a tetrahedron where the silicon atom is located at the center and four nitrogen atoms are located at the four vertices. This forms a continuous and strong network structure in three-dimensional space, resulting in exceptional material properties.
Silicon nitride exists in three crystal forms, with two common types:
- α-Si₃N₄: Needle-like crystals, white or off-white in color
- β-Si₃N₄: Darker colored, dense granular polyhedron or short prism
Both are hexagonal crystal structures. The α phase has higher hardness but is chemically unstable compared to the β phase, which transforms at high temperatures. Therefore, β-Si₃N₄ is the primary form used in silicon nitride ceramics.
Performance Characteristics
Physical Properties
- Thermal properties: High-temperature refractory substance with no melting point, decomposes at approximately 1900°C under normal pressure
- Excellent creep resistance under high pressure
- Softening point up to 1800°C for reaction sintered silicon nitride without binder
- Good thermal conductivity
- Low thermal expansion coefficient
- Excellent electrical insulation performance with small dielectric coefficient and high breakdown voltage
Chemical Properties
- Oxidation resistance: Does not react with oxygen in dry atmosphere below 800°C
- Molten metal corrosion resistance: Resists infiltration and corrosion from elemental metal melts (except copper)
- Resistance to acid, alkali and salt corrosion: Soluble in hydrofluoric acid but resistant to dilute acids
Mechanical Properties
- Excellent high-temperature strength with minimal strength attenuation at 1200°C compared to room temperature
- Very low high-temperature creep rate due to strong covalent bonds
- High hardness, second only to superhard materials like diamond, cubic BN, and B₄C
- Low friction coefficient with self-lubricating properties similar to oiled metal surfaces
Applications
Automotive Industry: Used as engine component material including lower wear rocker pads, turbochargers for reduced inertia and engine lag, and waste gas control valves for improved acceleration.
Bearings: Silicon nitride ceramics offer excellent impact resistance, making them ideal for high-performance bearings. Used in NASA space shuttle main engines, high-end automotive bearings, industrial bearings, wind turbines, and various sports equipment.
High Temperature Applications: One of the few monolithic ceramic materials capable of surviving severe thermal shocks and thermal gradients in hydrogen/oxygen rocket engines.
Medical Applications: Used in orthopedic applications and as an alternative to PEEK and titanium in spinal fusion devices. The hydrophilic, microstructured surface contributes to strength, durability and reliability.
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Company
BLOOM(suzhou) Materials Co.,Ltd
Location
B615, Future Fortune Building, No. 1 Wangxi Road, Zhangjiagang City, Jiangsu Province
Contact Person
Kara Liu