Precision Insulating Ceramic Rods for High-Temperature & High-Voltage OEM Applications
Technical Specifications & Material Grades
We manufacture custom and standard insulating ceramic rods utilizing high-purity engineering oxides. Material selection dictates thermal, mechanical, and electrical performance in demanding industrial environments. All manufacturing processes operate under certified ISO 9001:2015 quality management protocols.
|
Material Grade |
Purity (Al2O3 / ZrO2) |
Max Use Temp (°C) |
Dielectric Strength (kV/mm) |
Flexural Strength (MPa) |
Primary Application Focus |
|
AL99 (Alumina) |
99.3% Al2O3 |
1700 |
15 - 18 |
350 - 380 |
High-frequency insulation, vacuum furnace tubes |
|
AL95 (Alumina) |
95.0% Al2O3 |
1500 |
12 - 15 |
300 - 330 |
General electrical standoffs, heater cores |
|
TZP (Zirconia) |
ZrO2 (Y-TZP) |
1000 |
10 - 12 |
900 - 1200 |
High mechanical load pins, impact-resistant guides |
Manufacturing Process & Dimensional Control
Raw material quality directly determines final component reliability. Our production workflow eliminates internal micro-voids and ensures tight geometric tolerances.
Powder Preparation: Spray-dried granules featuring controlled binder distribution to ensure uniform green density during dry pressing or isostatic pressing.
Green Machining: CNC turning and grinding performed on pre-sintered (bisque) material to achieve complex profiles prior to high-temperature densification.
High-Temperature Sintering: Controlled-atmosphere tunnel and batch kilns operating up to 1800 °C featuring computerized soak-profile monitoring to eliminate residual stress.
Post-Sintering Diamond Grinding: Outer diameters (OD) and tight-tolerance lengths finished using diamond-wheel grinding to achieve ±0.01 mm precision and surface roughness down to Ra 0.4 um.
Quality Inspection & Testing Protocol
Every production lot undergoes rigorous physical and electrical verification before packaging. Full material test reports, RoHS compliance documentation, and ISO 9001 quality certificates accompany shipments upon request.
Dimensional Verification: Laser micrometers and 3D coordinate measuring machines (CMM) check concentricity, straightness (<= 0.05 mm/100 mm), and length.
Density Testing: Archimedes immersion method verifying theoretical density percentage (>= 98.5% for AL99).
Dielectric Breakdown Testing: Sample-lot high-voltage screening performed according to ASTM D149 standards.
Dye Penetrant Inspection: Non-destructive surface crack detection applied to structural and high-load rods.
Application Matching Guide
Selecting the correct ceramic rod prevents premature thermal fatigue or dielectric failure.
Plaintext
[Furnace & Thermal Processing] --> AL99 Alumina Rods (High temp resistance, low dielectric loss)
[Semiconductor Equipment] --> 99% Alumina / Zirconia (Plasma resistance, zero outgassing)
[High-Stress Mechanical] --> Y-TZP Zirconia Rods (High fracture toughness, wear resistance)
Supplier Evaluation Criteria
Facility Capabilities: 12 industrial sintering kilns, 18 CNC precision grinding centers, and dedicated green-machining cells operating under strict ISO 9001 protocols.
Batch Traceability: Laser-etched lot numbers on secondary packaging link directly to raw material powder test certificates, RoHS declarations, and internal sintering logs.
Export Compliance: ISPM15 heat-treated wooden crates and vacuum-sealed inner packaging prevent transit moisture absorption, static accumulation, and surface chipping.
Request for Quote (RFQ) Checklist
To accelerate your technical review and quotation turnaround, please provide the following parameters in your inquiry:
Material Grade: (e.g., 99% Alumina or Zirconia)
Dimensions: Outer Diameter (OD), Inner Diameter (if tubular), Length, and strict tolerance limits.
Operating Environment: Maximum working temperature, thermal cycling frequency, and voltage load.
Quantity: Prototype batch size versus estimated annual usage (EAU).
Technical Drawing: STEP, IGES, or PDF format with GD&T callouts.
Frequently Asked Questions
Q: What is the maximum straightness tolerance achievable for long ceramic rods?
A: For standard diameters (5 mm to 30 mm), we maintain a standard straightness tolerance of 0.1 mm per 100 mm. For precision-ground rods, post-sintering straightening processes can achieve <= 0.05 mm per 100 mm depending on the length-to-diameter aspect ratio.
Q: Can these ceramic rods be machined or modified by our team after delivery?
A: Fully sintered high-purity alumina and zirconia possess extreme hardness (Mohs 9). They cannot be machined with conventional metalworking tools. Any drilling, threading, or profiling must be executed either in the green/bisque state by our facility or via diamond/laser machining post-sintering. We recommend submitting fully detailed drawings for finished components.
Q: How do you prevent contamination during high-temperature furnace use?
A: Our AL99 grade utilizes ultra-pure 99.3% alumina powder with controlled silica and alkali impurities (Na2O < 0.1%). This low-impurity profile prevents glass-phase softening or volatile outgassing in vacuum furnaces operating up to 1600 °C.
Q: What is your standard lead time for custom dimensions?
A: Prototyping (1-50 pcs): 2 to 3 weeks, including green machining and diamond finishing.
Volume Production: 4 to 6 weeks, depending on kiln scheduling and custom tooling requirements.
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