For engineers, researchers, and procurement specialists in demanding industries, a thorough understanding of material specifications is crucial for successful product development and reliable manufacturing. Boron Carbide (B4C), a superhard ceramic with extensive applications, has a set of technical specifications that buyers must scrutinize. This guide will break down these critical parameters to help you make informed purchasing decisions.

Understanding the Core Identifiers: CAS Number and Chemical Formula

The most fundamental identifiers for any chemical compound are its CAS Registry Number and chemical formula. For Boron Carbide, these are:

  • CAS Number: 12069-32-8. This unique numerical identifier is essential for distinguishing B4C from other compounds and is a primary search term when inquiring about its availability.
  • Chemical Formula: B4C. This formula indicates that the compound is composed of boron and carbon atoms. While often represented as B4C, the stoichiometry can sometimes vary slightly, influencing properties.

Key Physical and Chemical Properties to Consider

When evaluating Boron Carbide powder, pay close attention to the following properties, as they directly impact its performance:

  • Appearance: Typically described as a black or dark gray powder. Consistency in appearance can be an indicator of product uniformity.
  • Purity: For most high-performance applications, purity is critical. Common specifications range from 98% to over 99.9%. Higher purity grades are often required for advanced ceramics, nuclear applications, and electronics. The presence of impurities like oxygen, nitrogen, or iron can significantly alter properties.
  • Particle Size: This is one of the most critical specifications. Boron Carbide is available in various particle sizes, from micron-sized powders to nanoparticles (e.g., 10-100 nm). The average particle size (APS) and distribution (D10, D50, D90) influence its use in abrasives, composites, and sintering processes. A specific surface area (BET) is also often provided for nanopowders.
  • Density: The theoretical density of B4C is around 2.51 g/cm³. Bulk density and tap density are also important metrics for powder handling and packing.
  • Melting Point and Boiling Point: B4C has an exceptionally high melting point (around 2350°C) and boiling point (around 3500°C), underscoring its suitability for high-temperature applications.
  • Hardness: Mohs hardness is typically cited around 9.3-9.4, and Vickers microhardness is very high (e.g., 4950 kgf/mm²).
  • Solubility: Generally insoluble in water and acids but soluble in molten alkalis. In nuclear applications, its solubility in specific acid mixtures might be relevant.
  • Thermal Neutron Capture Cross-Section: Crucial for nuclear applications, this property quantifies B4C's effectiveness in absorbing neutrons.

Procurement Best Practices: What to Ask Your Supplier

When inquiring about Boron Carbide powder, be prepared to specify your needs and ask for detailed technical data. Key questions include:

  • What is the exact purity of the B4C powder, and what are the levels of major impurities?
  • Can you provide the particle size distribution (APS, D10, D50, D90) and BET surface area, if applicable?
  • Is the material available in specific isotopic enrichments of Boron-10?
  • What are the typical bulk density and tap density?
  • Do you provide a Certificate of Analysis (COA) with each batch?
  • What are your packaging options, and can they meet our handling requirements?

As a trusted manufacturer and supplier, we provide high-quality Boron Carbide powder (CAS 12069-32-8) with comprehensive technical specifications. If you are looking to buy B4C and require precise material properties for your applications, please contact our sales team. We are committed to offering detailed technical support and ensuring you receive the exact material you need for optimal performance.