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Silicon Nitride Positioning Block use high-toughness, low-expansion, and ultra-wear-resistant silicon nitride ceramic as the substrate. They are specifically designed for precision applications such as semiconductors and automated equipment, combining high precision, high stability, and insulation and corrosion resistance. Compared to traditional metal positioning components, they exhibit no wear or precision drift over long-term use, significantly improving equipment lifespan and production yield. They are an ideal upgrade solution for high-end precision tooling and fixtures.
Si₃N₄ Positioning Block for New Energy Equipment
Product Description
Silicon Nitride Blocks (Si₃N₄ Positioning Blocks) are high-performance industrial positioning elements manufactured using precision molding and high-temperature sintering processes. Designed to meet the mechanical positioning requirements of high precision, high durability, and extreme operating conditions, these products are widely used in semiconductor manufacturing, aerospace, precision machine tools, automated welding, and new energy equipment. With their extremely low coefficient of thermal expansion (approximately 3.2 × 10⁻⁶/K), excellent dimensional stability, and superior wear and corrosion resistance, silicon nitride ceramic positioning blocks have become an ideal replacement for traditional metal positioning components, especially suitable for high-end manufacturing scenarios sensitive to temperature drift, severe wear, or strong chemical corrosion.
Silicon nitride ceramic positioning blocks are reliable positioning products that empower high-end manufacturing with the ultimate precision of materials technology.
Product Core Advantages
1.Ultimate dimensional stability
Silicon nitride ceramics have a coefficient of thermal expansion that is only about one-quarter that of steel. In working environments with drastic temperature changes, the positioning block can maintain high geometric accuracy, effectively avoiding positioning deviations caused by thermal expansion and contraction. Deformation under long-term load is less than 0.01%, which is a key guarantee for temperature-sensitive equipment such as semiconductor lithography machines and high-precision CNC machine tools.
2.Superior wear resistance and self-lubricating properties
With a vickers hardness of over 1500 HV, silicon nitride positioning blocks possess excellent self-lubricating properties and a low coefficient of friction. Under frequent clamping, sliding, or rotating positioning conditions, the service life of silicon nitride positioning blocks is typically 3 to 5 times longer than that of metal positioning parts, significantly reducing equipment maintenance frequency and downtime costs.
3.Excellent high temperature resistance and thermal shock resistance
It maintains stable mechanical strength even at temperatures up to 1200°C and exhibits excellent thermal shock resistance (withstanding rapid temperature changes exceeding 500°C). Suitable for extreme environments such as high-temperature welding fixtures, heat treatment tooling, and hot-end positioning in aerospace engines.
4.Excellent chemical inertness
Except for hydrofluoric acid, it is resistant to almost all inorganic acids, strong alkalis, and molten metals. In high-temperature steam and corrosive atmospheres, it forms a dense protective oxide layer on its surface, preventing oxidation or electrochemical corrosion during long-term service. It is particularly suitable for corrosive environments such as chemical processing and semiconductor etching.
5.Lightweight and High Rigidity
With a density of only about 3.2 g/cm³, roughly half that of steel, it helps reduce the inertial mass of high-speed moving parts, improving the response speed and positioning accuracy of automated equipment, while maintaining high rigidity and resistance to deformation.
6.Low outgassing and high cleanliness
The material is dense and highly pure, exhibiting extremely low outgassing rates in vacuum and high-cleanliness environments. This meets the stringent requirements of semiconductor and aerospace vacuum chambers for ion contamination and particle control.
| Industry Sectors | Specific Applications | Core Values |
| Semiconductor Manufacturing | photolithography machine positioning module, wafer transfer fixture, etching cavity support block, PECVD carrier positioning | nanoscale positioning accuracy, fluorine-based corrosion resistance, and low metal contamination |
| Aerospace | engine hot-end component inspection and positioning, turbine assembly fixture, navigation and fixing device | dimensionally stable and radiation resistant under extreme temperature ranges of -196°C to 1200°C. |
| Precision Machinery | CNC machining center positioning reference, coordinate measuring machine fixture, guide block for automated production line | long-term accuracy retention and long maintenance-free cycle |
| Welding and Brazing | high-temperature welding positioning pins/blocks, induction heating coil brackets | high temperature resistant adhesion, no oxidation or deformation, precise positioning |
| New Energy | lithium-ion battery electrode cutting and positioning, fuel cell stack assembly tooling, photovoltaic silicon wafer support | insulating, wear-resistant, lightweight and high-strength |
| Chemicals and Pharmaceuticals | corrosion-resistant valve positioning, reactor stirring limit, pump body sealing support | resistant to acid and alkali corrosion, with no metal ion precipitation |
| Metallurgy and Heat Treatment | high-temperature furnace tooling fixtures and heat treatment material tray positioning blocks | thermal shock resistant, creep resistant, non-adhesive to metal |
Product Specifications and Customization Services
1.Standard Specifications Range
Dimensions: customized according to customer requirements, maximum single piece size 500×400×200 mm
Hole Accuracy: locating hole diameter Φ1~Φ100 mm, hole spacing tolerance ±0.005 mm
Geometric Tolerances: flatness, parallelism, and perpendicularity up to 0.003 mm/100 mm
Surface Treatment: optional treatments include precision grinding, mirror polishing, black anodizing, and CVD coating reinforcement.
2.Customization Capabilities
Material Grades: standard grade / high purity grade (metal impurities << 100 ppm) / high thermal conductivity grade (thermal conductivity > 80 W/(m·K))
Structural Complexity: supports porous, irregularly shaped, thin-walled, and nested structure designs
Composite Structures: silicon nitride-metal welded composite positioning parts are available, balancing the wear-resistant ceramic surface with the metal connection strength.
Fast Prototyping: standard parts sampled in 7-15 days, customized parts sampled in 20-30 days.
Manufacturing Process and Quality Assurance
1.Key Process Flow
Powder Preparation: submicron-sized β-Si₃N₄ powder is prepared using high-purity silicon powder carbothermal reduction nitridation or chemical vapor deposition.
Precision Forming: cold isostatic pressing (CIP), dry pressing, or injection molding ensure uniform bulk density.
High-Temperature Densification: gas pressure sintering (GPS, 1600~1800°C) or hot isostatic pressing (HIP) achieves a density >99.5%.
Precision Machining: diamond grinding, CNC machining, and laser fine-tuning achieve micron-level dimensional accuracy.
Full Inspection Before Shipment: coordinate measuring machine (CMM), ultrasonic flaw detection, and surface roughness inspection ensure zero-defect delivery.
2.Quality System
ISO 9001 Quality Management System Certification
RoHS/REACH Environmental Compliance
Supports compliance with SEMI standards, GJB military standards, ASTM/GB standards, etc.
Selection Guide
| Application Scenarios | Recommended Level | Key Selection Recommendations |
| Semiconductor photolithography/etching | electronic grade | high purity, low outgassing, Ra << 0.1 μm |
| High-temperature welding/heat treatment | standard high temperature resistance grade | thermal shock resistance is preferred; black surfaces are acceptable. |
| Precision machine tools/measuring instruments |
high precision level |
geometric tolerances << 0.005 mm, stability preferred. |
| Highly corrosive chemical environments | corrosion resistant | density > 99.5%, avoiding penetrating pores. |
| High-speed moving parts | lightweight | thin-walled design, density << 3.2 g/cm³ |
Our workshop
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CNC Workshop |
Testing Room |
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Surface grinding Workshop |
Sintering Workshop |
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Circular Grinding Workshop |
Injection molding Machine Workshop |
Why choose us?
1.Customized R&D, rather than standard product adaptation
2.Deep control of materials science：Material Selection Based on Needs，Microstructure Optimization，Batch Consistency
3.Precision machining capability：Flatness can reach 0.001mm, parallelism 0.002mm, and roughness Ra 0.1μm.
FAQ
Q1: What products does your company offer?
We specialize in high-performance ceramics such as alumina and silicon nitride, providing insulators, structural components, wear-resistant parts, and customized solutions.
Q2: Can you customize non-standard parts?
Yes. We support processing based on provided drawings and collaborative technical development, offering a full-process service from design to mass production.
Q3: What about accuracy and delivery time?
Standard tolerance ±0.05mm, precision grade ±0.01mm; samples 7-15 days, bulk orders 20-30 days.
Q4: Main application areas?
Power, electronics, machinery, chemical, and aerospace industries.
Q5: Quality assurance measures?
Full-process quality inspection, providing material reports and performance test data, supporting third-party certification and testing.
Q6: Do you provide technical support?
We provide professional support such as material selection consultation, design optimization, and failure analysis.
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