Overview
Tungsten boride (WB) micron powder is an advanced ceramic material prized for its exceptional mechanical and thermal properties. It belongs to a class of ultra-high-temperature ceramics (UHTCs) and is increasingly adopted in industrial applications demanding extreme durability. As a refractory compound, WB exhibits a unique combination of high hardness (comparable to tungsten carbide), oxidation resistance, and thermal conductivity. Its micron-scale particle size enhances sinterability for composite materials and coatings.
Physical and Chemical Properties
WB powder typically appears as a gray-black crystalline solid with a hexagonal crystal structure. Its density of 10.8 g/cm³ contributes to excellent wear resistance, while the melting point approaching 2900°C ensures stability in high-temperature environments. The material demonstrates remarkable chemical inertness, resisting attack from most acids and alkalis at room temperature. Its thermal expansion coefficient (5.8×10⁻⁶/K) provides compatibility with other refractory materials in composite systems.
Main Applications
The primary use of WB micron powder is in manufacturing cutting tools and abrasion-resistant components, often as an additive to tungsten carbide composites. It significantly extends tool life in machining hardened steels and superalloys. In aerospace, WB serves in rocket nozzle linings and thermal protection systems. Emerging applications include diffusion barriers in microelectronics and neutron shielding in nuclear reactors due to boron's high neutron absorption cross-section.
Safety and Storage
While WB is not classified as highly toxic, its fine particulate form requires careful handling. Dust inhalation risks necessitate NIOSH-approved respirators during processing. Static electricity accumulation should be prevented in powder handling systems. Storage recommendations include moisture-proof containers under argon or nitrogen atmosphere. Bulk quantities should be kept in explosion-proof areas with proper grounding, as fine metal powders can present dust explosion hazards.
B2B Procurement Guide
Industrial buyers should specify particle size distribution (PSD) using laser diffraction analysis, with most applications requiring D50 values between 1-5µm. Purity requirements typically range from 99% to 99.9%, with oxygen content being a critical impurity to control (<0.5%). Consider suppliers offering customized surface treatments (e.g., silane coupling agents) for improved dispersion in matrix materials. For large orders (100kg+), request material test reports (MTRs) with batch-specific property data and consider third-party verification for critical applications.
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