High Purity Spray Drying Silicon Nitride Si3N4 Granulated Ceramic Powder
Silicon Nitride (Si₃N₄) is a high-performance white to gray crystalline powder with a melting point of 1900 °C and a density of 2.2–3.5 g/cm³. It exists in two crystalline forms: α-Si₃N₄ (hexagonal structure) and β-Si₃N₄ (crystalline structure). The material exhibits exceptional hardness, high-temperature stability, and resistance to oxidation, making it one of the most important structural ceramics available today.
Silicon nitride granulated powder is engineered for subsequent forming processes such as dry pressing and isostatic pressing. Incorporated with sintering aids and binders, it features a more complex composition. Specially developed to meet dry‑forming requirements, silicon nitride granulated powder serves as the key material for large‑scale industrial production.
| Component Type |
Main Component |
Key Auxiliary Components |
| Core Component |
Silicon Nitride (Si₃N₄) |
None |
| Content Range |
80%‑95% |
Sintering aids: 5%‑20%; Binders: 0.5%‑3% |
| Sintering Aids |
- |
Function: Lower sintering temperature and promote densification. Common types:1. Oxides: Y₂O₃ (Yttria), Al₂O₃ (Alumina), MgO (Magnesia);2. Composite aids: Combinations such as Y₂O₃‑Al₂O₃, Y₂O₃‑MgO (most commonly used). |
| Binders |
- |
Function: Improve particle strength and prevent fracture during forming. Common types:1. Organic binders: PVA (Polyvinyl Alcohol), PEG (Polyethylene Glycol);2. Inorganic binders: Water glass (seldom used, prone to introducing impurities). |
Core positioning: Exclusively designed for dry forming processes and cannot replace raw powder for wet‑processing applications.
Applicable forming methods:
‑ Dry pressing: For mass production of components with conventional geometries.
‑ Dry‑bag isostatic pressing: For manufacturing components with higher precision and quality requirements.
Core advantages: Excellent flowability, compatible with fully‑automatic presses to realize high‑speed and large‑volume industrial production.
After compaction using silicon nitride granulated powder, one indispensable procedure must be performed; otherwise, qualified products cannot be obtained.
Mandatory procedure: Compacted green bodies must undergo debinding treatment prior to high‑temperature sintering.
Purpose of debinding: Organic binders and other additives inside granulated powder particles are completely removed by heating, comparable to the air‑drying step for traditional ceramic green bodies.
Final process sequence: After debinding is completed, high‑temperature sintering can be carried out to produce dense silicon nitride ceramic components.
Technical Specifications of Silicon Nitride (Si₃N₄) Powder
Property Value
Other Names Silicon (IV) nitride, α-Si₃N₄, SiN, Trisilicon tetranitride
CAS Number 12033-89-5
Chemical Formula Si₃N₄
Molecular Weight 140.28 g/mol
Appearance White to gray powder
Melting Point 1900 °C
Density 2.2–3.5 g/cm³
Solubility Insoluble in water
Exact Mass 139.943 g/mol
Silicon Nitride powder offers a combination of advanced ceramic properties:
– High fracture toughness
– Excellent thermal shock resistance
– High wear resistance
– Low thermal expansion coefficient
– Stable performance at high temperatures
Silicon Nitride powder is widely used in a variety of industrial applications, including:
– Structural ceramic components
– Bearing and rolling elements
– Cutting tools and wear-resistant parts
– Aerospace engineering components
– Automotive engine components
– Semiconductor equipment parts
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