Atomfair High-Purity Silicon Nitride (Si3N4) Ceramic Powder for Bearing Materials, Alpha Phase ≥93%, D50 <0.9 μm, 4N (99.99% purity)
Product Description
Atomfair High-Purity Silicon Nitride (Si3N4) Ceramic Powder for Bearing Materials is supplied as white powder with Alpha phase ≥93% and the stated particle-size specification. It is intended for silicon nitride ceramic bearing and rolling-element materials research. 4N (99.99% purity) grade.
Technical Specifications |
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Customization & Ordering
Custom specifications, quantities, and packaging may be available upon request. Minimum order quantities, pricing, and lead times will be confirmed during technical review and quotation.
Key Features and Advantages
- Alpha-phase silicon nitride grade with a defined phase proportion.
- D50 particle size below 0.9 μm for ceramic rolling-element material processing.
- Controlled Fe, Al, Ca, free silicon, carbon, and oxygen specifications.
APPLICATION SCOPE: silicon nitride ceramic bearing and rolling-element materials research.
DOCUMENTATION: COA and SDS can be provided upon request for batch-specific confirmation.
TAILORED SOLUTIONS FOR RESEARCH
Contact our engineering team for technical support or official institutional quotations.
Why is the alpha phase content specified at ≥93% for silicon nitride bearing powder?
The alpha phase content of ≥93% is specified to ensure optimal sintering behavior. During sintering, alpha-Si3N4 transforms to beta-Si3N4, which drives densification and controls the final microstructure. A high alpha phase fraction is critical for achieving the mechanical properties required for ceramic bearing and rolling-element applications.
How does the D50 particle size of <0.9 μm affect processing of this Si3N4 powder?
The submicron particle size (D50 <0.9 μm) enhances sinterability by providing high surface area and driving force for densification. It also enables the production of finer, more uniform microstructures in the sintered ceramic, which is essential for the reliability and performance of bearing balls and rolling elements.
What impurity limits are specified for this silicon nitride powder and why are they important?
The powder specifies iron ≤500 ppm, aluminum ≤300 ppm, calcium ≤300 ppm, free silicon <0.3%, carbon ≤0.12%, and oxygen ≤1.5%. These impurities can form secondary phases, weaken grain boundaries, or reduce high-temperature performance. Controlling these limits is critical to maintain the mechanical integrity and reliability of sintered bearing components.
Atomfair high-purity silicon nitride powder with alpha phase ≥93% and D50 <0.9 μm is suitable for ceramic bearing materials research, but requires careful handling due to impurity and oxygen specifications.
Positive
- High Alpha Phase Content: Alpha phase ≥93% provides the crystalline structure preferred for high-strength bearing ceramics.
- Submicron Particle Size Control: D50 <0.9 μm enables densification and uniform microstructure in rolling-element materials.
Trade-offs
- Trace Impurity Sensitivity: Iron, aluminum, and calcium limits require contamination-free handling to maintain 4N purity.
- Oxygen Content Constraints: Oxygen content up to 1.5% must be accounted for in sintering schedules to avoid phase decomposition.
Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.
To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.
Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD excl. heavy equipment). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).
