Silicon Nitride Bar– High Strength Ceramic for Demanding Industrial Conditions
Silicon nitride (Si₃N₄) bars are advanced engineering ceramics designed for applications requiring a combination of strength, heat resistance, and long-term durability. Their unique microstructure delivers high fracture toughness, excellent thermal shock performance, and superior wear resistance, making silicon nitride one of the most preferred materials in heavy-duty industrial environments.
Key Features & Benefits
High Mechanical Strength
Silicon nitride bars maintain exceptional bending strength even under continuous high temperatures, making them suitable for heavy-load structural components.
01
Excellent Thermal Shock Resistance
Si₃N₄ can withstand rapid temperature changes without cracking, allowing reliable performance in hot-zone applications and molten metal processes.
02
Superior Wear and Corrosion Resistance
The material resists abrasion, oxidation, and chemical attack-ideal for industries such as aluminum casting, papermaking, machining, and semiconductor manufacturing.
03
Dimensional Stability
Low thermal expansion ensures that silicon nitride bars maintain precise geometry even during repeated heating cycles.
04
Lightweight but Extremely Tough
With a low density of ~3.2 g/cm³, it provides significant weight reduction compared to metal components without compromising strength.
05
Typical Applications
● Aluminum & Non-Ferrous Metal Casting
Used as guide bars, alignment bars, support bars, and components in direct contact with molten aluminum due to excellent non-wettability.
● Semiconductor & Electronics
Precision fixtures, support bars, and cleanroom-grade mechanical components.
● Industrial Equipment
Wear-resistant bars, sliding components, insulating supports, and structural parts in high-friction environments.
● High-Temperature Processing
Kiln furniture, furnace components, and high-load supports operating up to 1400°C.
● Robotics & Automation
Lightweight structural bars with high stiffness for dynamic systems
Specifications (Typical Values)
| Property | Value |
|---|---|
| Density | 3.2 g/cm³ |
| Flexural Strength | 900–1100 MPa |
| Hardness | 15–16 GPa |
| Fracture Toughness | 6–7 MPa·m¹/² |
| Thermal Conductivity | 20–30 W/m·K |
| Coefficient of Thermal Expansion | 2.8–3.2 ×10⁻⁶/K |
| Max Working Temperature | 1200–1400°C |
(Custom compositions available depending on working conditions.)
Why Choose Our Silicon Nitride Bars?
Manufacturer with 10+ years of advanced ceramics production
Strict powder selection and optimized sintering process
Stable performance in thermal, mechanical, and chemical environments
Custom dimensions based on drawings
Long service life and minimal maintenance requirements
FAQ – Silicon Nitride Bar
Q1: What is the maximum service temperature of a silicon nitride bar?
Most silicon nitride bars can operate up to 1200–1400°C, depending on the grade and application environment.
Q2: Can silicon nitride bars be used in molten aluminum?
Yes. Silicon nitride has excellent non-wettability, thermal shock resistance, and corrosion resistance, making it ideal for aluminum casting equipment.
Q3: Can you customize the shape and length?
Absolutely. We produce silicon nitride bars according to customer drawings, including non-standard sizes, holes, slots, and machined surfaces.
Q4: How does silicon nitride compare to alumina or SiC?
Stronger and tougher than alumina
Better thermal shock resistance than both alumina and silicon carbide
More suitable for dynamic or high-speed equipment
Q5: What is the typical lead time?
Generally 2–4 weeks, depending on complexity and order quantity.
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Silicon Nitride ceramic
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