Precision Advanced Ceramics — Custom Wear-Resistant Alumina Ceramic Valve Sleeve & Bushing Specialist
Over a decade of specialized expertise in technical structural ceramics. Supplying high-precision, wear-resistant, and corrosion-proof alumina ceramic valve sleeves, pump cylinder liners, and hollow bushings for worldwide fluid control and chemical engineering industries.
Product Overview
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Technical Properties & Precision Machining Tolerances
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- Alumina Purity: ≥ 99.7% - 99.9% (Al2O3, Grade A-300)
- Bulk Density: 3.92 g/cm³
- Machining Tolerance: ± 0.002 mm (± 2 μm, Air Gauge Verified)
- Vickers Hardness: 1600 HV1 (Rockwell 91 HRA)
- Compressive Strength: 2450 MPa
- Flexural Strength: 370 MPa
- Maximum Working Temp: 1650°C (Oxidizing) / 1700°C (Inert)
- Thermal Conductivity: 32 W/m·K (Thermal Shock ΔT 220°C)
- Dielectric Breakdown: 22 kV/mm (Volume Resistivity 10¹⁵ Ω·cm)
- Surface Roughness: Diamond Honed ID Ra 0.2 μm
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Key Selling Points:
Selling Point 1 — Ultra-Precision Machining Tolerance Down to ±0.002mm (±2 μm)
Manufactured via high-precision CNC cylindrical diamond grinding and internal bore micro-honing, achieving guaranteed diameter tolerance within ±0.002mm and coaxiality ≤ 0.003mm. Ensures zero-play precision clearance fit, eliminating fluid leakage and high-speed plunger jamming.
Selling Point 2 — Extreme Wear Resistance (1600 HV1) & Compressive Strength (2450 MPa)
Features near-diamond microhardness (1600 HV1 / 91 HRA) and an impressive 2450 MPa compressive yield strength. Delivers 5–10 times the wear lifespan of tungsten carbide and hardened tool steels in aggressive slurry pumping and solid particle fluid systems.
Selling Point 3 — 100% Chemical Acid & Alkali Corrosion Immunity
Impervious to concentrated sulfuric acid (H2SO4), hydrochloric acid (HCl), nitric acid (HNO3), caustic soda (NaOH), and organic chemical solvents up to 1650°C. Prevents pitting, chemical erosion, and heavy metal contamination in pharmaceutical and battery slurry applications.
Selling Point 4 — Concentric Stepped Internal Bore & Engineered Chamfer Sealing
Engineered with precise concentric internal stepped shoulders for repeatable axial stop positioning and rigid mechanical sealing. All entry and exit edges feature precision protective chamfering, preventing micro-chipping during high-pressure interference fitting.
Selling Point 5 — Mirror-Honed Bore (Ra 0.2 μm) & Low Friction Coefficient
Internal diameter is diamond-honed to Ra 0.2 μm mirror smoothness, substantially reducing fluid boundary drag, minimizing friction heat generation, and dramatically extending mating piston seal and packing ring operating lifespans.
Selling Point 6 — 100% Air Gauge Metrology & Rapid Prototyping in 3–7 Days
Every batch is verified through pneumatic air gauging and Zeiss CMM multi-point coordinate measurement, with official inspection certificates provided with each delivery. Supported by strict NDA agreements and 2-hour engineering feasibility reviews.
Structural Breakdown & Stepped Geometry
- Concentric Stepped Shoulder: Precision axial seating ledge provides reliable mechanical stopping and fluid-tight sealing under high hydrostatic pressure.
- Diamond-Honed Cylindrical Bore: Concentric roundness and coaxiality ≤ 0.003mm ensure frictionless plunger stroke and zero pressure bypass.
- High-Rigidity Outer Casing: Diamond ground outer diameter allows tight press-fit insertion into stainless steel or alloy housings with zero radial play.
End-to-End Manufacturing & Quality Control
- Step 1: High-Purity CIP Compaction: Sub-micron 99.9% Al2O3 ceramic powders compacted under high isostatic pressure for isotropic density.
- Step 2: 1720°C Clean Sintering: Atmosphere electric furnace sintering achieving near-theoretical density (3.92 g/cm³).
- Step 3: Precision OD Grinding & ID Honing: Diamond tooling machining achieving diameter tolerance ±0.002mm and surface finish Ra 0.2 μm.
- Step 4: Pneumatic Air Gauge & CMM Inspection: 100% dimensional, roundness, and coaxiality inspection with certified metrology reports.
Application
Key Industrial Flow & Wear Equipment Applications
- High-Pressure Plunger & Metering Pumps: Ceramic cylinder sleeves and plunger bushings resisting high-velocity water jetting and slurry erosion.
- Corrosion-Proof Fluid Control Valves: Ceramic control valve sleeves, throttle bushings, and plug valve seats for petrochemical pipelines.
- Lithium Battery Slurry Sand Mills: Contamination-free grinding chamber inner wear sleeves protecting cathode/anode slurry from metal contamination.
- Mechanical Seals & Chemical Process Pumps: High-speed rotary and stationary ceramic wear rings and shaft protection sleeves with ±0.002mm seating precision.
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Thermal Conductivity @ 20°C
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Thermal Expansion a at 20–400°C
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Properties
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Unit
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95%Al2O3
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99%Al2O3
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99.5%Al2O3
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Dielectric Constant
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1MHz
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9.4
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9.9
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9.9
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Dielectric Strength
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V/m
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15 x 10 6
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15 x 10 6
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15 x 10 6
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Dielectric Loss
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1MHz
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4 x 10 -4
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4 x 10 -4
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4 x 10 -4
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Volume Resistivity @ 25°C
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Ω・cm
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>10 14
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>10 14
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>10 14
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Volume Resistivity @ 500°C
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Ω・cm
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>10 8
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>10 8
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>10 10
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Packing
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Hunan Yuanhong New Material Co.,Ltd was established in 2016 ,there are over 100 sets of ceramic professional equipments , several types of furnace in more than 8000 square meters production workshops. ISO9001 certified, a variety of advanced ceramic materials are ROHS and REACH certified. |
Q1: How do you verify and guarantee the ±0.002mm machining tolerance?
A1: We employ high-precision pneumatic air gauges for bore diameter calibration and Zeiss coordinate measuring machines (CMM) for geometric roundness and coaxiality. Full metrology reports are delivered with every order.
Q2: Can this ceramic sleeve withstand highly concentrated strong acid media?
A2: Absolutely. 99.9% alumina ceramic offers complete chemical inertness against concentrated sulfuric acid, nitric acid, hydrochloric acid, and hot alkaline solutions with zero metal leaching.
Q3:What engineering drawing file formats do you accept for quotation?
A3: We accept 3D CAD models in STEP (.stp), IGES (.igs), and 2D engineering drawings in DWG or PDF with specified tolerance annotations. Strict NDA signed before drawing transfer.
Q4: What is your standard turnaround time for samples and production?
A4: Rapid precision prototyping is delivered in 3–7 business days. Batch production runs are completed in 15–25 business days depending on grinding complexity.
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