Aluminium Oxide (Alumina) 99.5% vs Hexagonal Boron Nitride (h-BN): 0% composition overlap. Significantly different materials serving different application areas.
Aluminium Oxide (Alumina) 99.5% vs Hexagonal Boron Nitride (h-BN)
Side-by-side chemical composition and mechanical property comparison.
Overview
Aluminium Oxide (Alumina) 99.5%
The most widely used engineering ceramic. Alpha-phase alumina (99.5% Al2O3) offers exceptional hardness (1440 HV), excellent dielectric properties, high compressive strength (2600 MPa), good thermal conductivity (35 W/m·K), and outstanding chemical resistance. Usable to 1750°C. Applications include wear pads, seal rings, substrates, thread guides, grinding media, furnace tubes, ballistic armor, and high-voltage insulators. Available in purities from 94% to 99.8%.
Hexagonal Boron Nitride (h-BN)
Hot-pressed hexagonal boron nitride — "white graphite". Unique among ceramics: soft (Mohs 2), easily machinable with conventional tools, self-lubricating. Excellent thermal shock resistance, high-temperature stability (2800°C in inert atmosphere). Good thermal conductivity (30–60 W/m·K) combined with outstanding electrical insulation. Anisotropic properties. Not wetted by most molten metals. Applications: BN crucibles for metal melting, break rings for continuous casting, high-temp insulators, evaporation boats, plasma-resistant parts, solid lubricant.
| Aluminium Oxide (Alumina) 99.5% | Hexagonal Boron Nitride (h-BN) | |
|---|---|---|
| Material Number | — | — |
| Category | ceramic | ceramic |
| Standard | — | — |
Chemical composition (wt%)
| Element | Aluminium Oxide (Alumina) 99.5% | Hexagonal Boron Nitride (h-BN) | Overlap |
|---|---|---|---|
| Al2O3 | ≥ 99.5% | — | — |
| SiO2 | ≤ 0.2% | — | — |
| MgO | ≤ 0.1% | — | — |
| Na2O | ≤ 0.1% | — | — |
Mechanical properties
| Property | Aluminium Oxide (Alumina) 99.5% | Hexagonal Boron Nitride (h-BN) | Unit |
|---|---|---|---|
| density | ≥ 3.89 | 1.9–2.1 | g/cm3 |
| flexural_strength | ≥ 379 | 33–61 | MPa |
| compressive_strength | ≥ 2600 | — | MPa |
Compatibility Assessment
Aluminium Oxide (Alumina) 99.5% and Hexagonal Boron Nitride (h-BN) have significantly different compositions (0% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is Aluminium Oxide (Alumina) 99.5% the same as Hexagonal Boron Nitride (h-BN)?
Aluminium Oxide (Alumina) 99.5% and Hexagonal Boron Nitride (h-BN) have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace Aluminium Oxide (Alumina) 99.5% with Hexagonal Boron Nitride (h-BN)?
Generally not recommended. The compositions differ significantly (0% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between Aluminium Oxide (Alumina) 99.5% and Hexagonal Boron Nitride (h-BN)?
The main differences are in the following elements: overall alloying content. Aluminium Oxide (Alumina) 99.5% is a ceramic grade, while Hexagonal Boron Nitride (h-BN) is a ceramic grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.