Aluminium Oxide (Alumina) 99.5% vs Silicon Carbide (Sintered SSiC): 0% composition overlap. Significantly different materials serving different application areas.
Aluminium Oxide (Alumina) 99.5% vs Silicon Carbide (Sintered SSiC)
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%.
Silicon Carbide (Sintered SSiC)
Pressureless sintered alpha-silicon carbide (SSiC). One of the hardest and lightest engineering ceramics (density 3.1 g/cm³). Exceptional thermal conductivity (120 W/m·K), very high compressive strength (3900 MPa), hardness 2800 HV, and outstanding chemical inertness. Maintains strength to 1650°C. Semiconductor (variable resistivity). Applications: mechanical seals, bearings, pump components, kiln furniture, semiconductor furnace parts, ballistic armor, brake discs.
| Aluminium Oxide (Alumina) 99.5% | Silicon Carbide (Sintered SSiC) | |
|---|---|---|
| Material Number | — | — |
| Category | ceramic | ceramic |
| Standard | — | — |
Chemical composition (wt%)
| Element | Aluminium Oxide (Alumina) 99.5% | Silicon Carbide (Sintered SSiC) | Overlap |
|---|---|---|---|
| C | — | ≤ 1.5% | — |
| Al2O3 | ≥ 99.5% | — | — |
| SiO2 | ≤ 0.2% | — | — |
| MgO | ≤ 0.1% | — | — |
Mechanical properties
| Property | Aluminium Oxide (Alumina) 99.5% | Silicon Carbide (Sintered SSiC) | Unit |
|---|---|---|---|
| density | ≥ 3.89 | ≥ 3.1 | g/cm3 |
| flexural_strength | ≥ 379 | ≥ 550 | MPa |
| compressive_strength | ≥ 2600 | ≥ 3900 | MPa |
Compatibility Assessment
Aluminium Oxide (Alumina) 99.5% and Silicon Carbide (Sintered SSiC) 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 Silicon Carbide (Sintered SSiC)?
Aluminium Oxide (Alumina) 99.5% and Silicon Carbide (Sintered SSiC) have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace Aluminium Oxide (Alumina) 99.5% with Silicon Carbide (Sintered SSiC)?
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 Silicon Carbide (Sintered SSiC)?
The main differences are in the following elements: overall alloying content. Aluminium Oxide (Alumina) 99.5% is a ceramic grade, while Silicon Carbide (Sintered SSiC) is a ceramic grade.
View full data for each material:
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.