High-Precision Zirconia Ceramic Rods: Engineering Data & Specifications
Material Properties & Grade Selection
Zirconia (ZrO2) provides the fracture toughness and wear resistance required for high-stress mechanical components. We specialize in Yttria-Stabilized Zirconia (Y-TZP) for structural reliability under extreme operational loads.
|
Property |
Y-TZP (Yttria-Stabilized) |
MSZ (Magnesia-Stabilized) |
Test Standard |
|
Density |
>= 6.00 g/cm3 |
>= 5.75 g/cm3 |
ASTM C373 |
|
Flexural Strength |
900 - 1200 MPa |
400 - 600 MPa |
ASTM C1161 (4-point) |
|
Fracture Toughness |
6 - 8 MPa·m1/2 |
4 - 5 MPa·m1/2 |
SEVNB / Indentation |
|
Vickers Hardness |
>= 1250 HV10 |
>= 1150 HV10 |
ASTM C1327 |
|
Thermal Expansion |
9.5 x 10^-6 /°C |
8.5 x 10^-6 /°C |
ASTM E228 |
Precision Machining & Dimensional Capabilities
We provide centerless ground rods with rigorous tolerance control suitable for high-speed automated assembly and precision fluid control systems.
Diameter Tolerance: Down to plus or minus 0.001 mm via precision diamond grinding.
Surface Finish: Ra <= 0.05 um (Polished) to Ra 0.8 um (As-sintered).
Geometric Control: Straightness <= 0.01 mm / 100 mm verified via laser runout testing.
Standard Stock: Diameters 2 mm to 100 mm; lengths up to 500 mm (Custom lengths available upon evaluation).
Application Constraints & Engineering Warnings
To ensure design success and prevent premature component failure, please consider the following metallurgical boundaries:
Hydrothermal Stability: Always specify dense, high-purity Y-TZP for pressurized steam or wet environments exceeding 250°C.
Tribological Limits: Avoid unlubricated, high-speed dry sliding against metal without proper thermal dissipation. Frictional heat can induce tetragonal-to-monoclinic phase transformation, leading to surface micro-spalling.
Manufacturing Workflow
Preparation: Spray-dried Y-TZP granules engineered for uniform green body density.
Forming: Isostatic pressing (CIP) for high-density structural integrity on large diameters.
Sintering: Controlled-atmosphere thermal profiling (1450°C to 1500°C) to achieve >= 99.5% theoretical density and eliminate open porosity.
Hard Machining: Multi-axis CNC cylindrical and centerless diamond grinding executed with high-pressure internal coolants to suppress subsurface thermal stress.
Quality Assurance & Auditing Evidence
For OEM supplier qualification and vendor audits, we provide full transparency and documentation:
Documented Traceability: Batch-specific Material Test Reports (MTR) including density, 4-point bend strength, and chemical purity analysis.
Verification Infrastructure: Laser-based non-contact metrology, optical comparators, and automated runout screening.
Process Control: Historical Cpk capability charts available upon request for critical outer diameter dimensions.
Procurement & Technical FAQ
Q: What is the maximum L/D ratio for small diameter rods?
A: To ensure straightness within tight tolerances for rods under 10 mm in diameter, we recommend an L/D ratio <= 20:1. Higher aspect ratios require secondary mechanical straightening or custom assembly designs.
Q: How do you mitigate micro-cracks during the grinding process?
A: We utilize fine-grit resin-bond diamond wheels coupled with high-pressure fluid delivery systems to minimize localized thermal loading and protect the ceramic subsurface.
Q: Are these rods compatible with metal housing shrink-fits?
A: Yes. Zirconia's thermal expansion coefficient (9.5 x 10^-6 /°C) matches ferritic and austenitic stainless steels more closely than other technical ceramics. Please submit your assembly operating temperature range for interference fit calculations.
Q: What is your standard lead time for custom prototype runs?
A: Custom orders requiring centerless grinding from existing stock blanks typically ship within 2 to 3 weeks. New tooling setups for non-standard diameters require 4 to 5 weeks.
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