| Alumina Coated Valve Balls | ||
| Size Range | 1/2" to 56" (Custom sizes available) | |
| Pressure Rating | PN10-PN420 (Class150-2500) | |
| Body Material | A105, A350 LF2, A182 F304, A182 F316, A182 F321, A182 F51, A182 F53, A182 F55, A182 F60, A182 F44, A564 630 (17-4PH) INCONEL625, INCONEL718, INCONEL825, Monel 400, Monel 500 etc |
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| Core Process/Coating | ENP,HCR,STL6, STL12, STL20,Cr3C2, WC-Co, WC-Cr3C2-Ni, TiC-NiMo, SiC, CrC,ZrO2, Al2O3, Cr2O3, ZnO, TiO, Al2O3-TiO2,STL1, STL6, STL12,Ni60, Ni55, Ni45 etc. | |
| Operating Temperature Range | ≤1200°C | |
| Parameter Category | Core Technical Parameters | Standards for Determining Advanced Technological Level |
| Machining ball accuracy | ≤ 0.025 mm | ≤ 0.005 mm (Ultra-High Precision) |
| Processing ball Roundness | ≤ 0.025 mm | ≤ 0.011 mm (Micron-Level ) |
| Balls concentricity | ≤ 0.025 mm | ≤ 0.005 mm (Ultra-High Precision) |
| Other supplements | ≤ 0.4 μm | ≤ 0.1 μm (Mirror-Level) |
| Parameter Category | Core Technical Parameters | Criteria for High-End Technical Level |
| Coating Thickness Control | Thickness Uniformity | Thickness deviation at any spherical position ≤±8% (stricter than the general ±10% standard) |
| Thickness Tolerance Range | 100 - 300 μm (common range for wear-resistant layers); special ranges can be noted. No missed spraying for ultra-thin coatings (<10μm) | |
| Coating Adhesion Performance | Surface Hardness | HV 1300+ |
| Bond StrengthBond Strength | ≥80 MPa | |
| Interface PorosityInterface Porosity | <0.5% | |
| Coating Surface Quality | Surface Roughness (Ra) | ≤0.2 µm |
| Spraying Accuracy (Positioning & Coverage) | Spraying Positioning Accuracy | ±0.1mm |
Core Products: A Ceramic Surface Engineered for Electrical Insulation & Chemical Inertness
Alumina (Al₂O₃) ceramic coating imparts the superior properties of engineering ceramics to a metal substrate, perfectly addressing special challenges where metallic materials fall short.
Alumina (Al₂O₃) ceramic coating imparts the superior properties of engineering ceramics to a metal substrate, perfectly addressing special challenges where metallic materials fall short.
Fundamentally Solving Electrochemical Corrosion & Electrical Interference
Our Alumina Coated valve Balls possess extremely high volume and surface resistivity, making them perfect electrical insulators. This property enables them to:
Isolate Galvanic Corrosion: When valves connect pipes of dissimilar metals, the coating completely blocks the electrical path between the ball and the media, fundamentally eliminating the risk of electrochemical corrosion.
Suit Electrolysis & Electrochemical Processes: In systems involving electrolysis, electroplating, or stray currents, the valve ball, as a core moving part, will not suffer from electrolytic corrosion or disturb process current distribution due to electrical flow.
Meet High-Purity Media Requirements: Eliminates the risk of metal ion leaching into high-purity media (e.g., ultrapure water, semiconductor chemicals) due to electrochemical activity.
Ultra-Hard Surface for Extreme Wear
Al₂O₃ ceramic boasts a hardness above Hv 1500, second only to diamond and silicon carbide. Therefore, Abrasion resistant alumina ball products offer exceptional resistance to abrasive wear from dry powders, granules, and fibers. Their wear resistance far surpasses that of most metal alloy coatings, demonstrating an exceptionally long service life when handling catalysts, dust, slag, and similar media.
Outstanding Chemical Inertness & Corrosion Resistance
Alumina ceramic is highly chemically stable across a wide pH range and offers excellent resistance to most strong acids, alkalis, and organic solvents. This makes Corrosion resistant coated valve ball suitable for a variety of extreme corrosive environments, from strong acid conveyance to alkaline slurry handling, with a smooth surface that resists scaling or chemical reaction.
Reliable Realization of Industrial-Grade Ceramic Coatings
The Industrial valve ceramic coated ball we provide is not a brittle monolithic ceramic part. Instead, it is a ceramic layer formed on a tough metal substrate via high-performance plasma spraying. This structure combines the substrate's resistance to mechanical shock with the extreme wear, corrosion, and insulating properties of the ceramic surface, ensuring practicality and reliability in demanding industrial settings.
Technical Focus: Plasma Spray Technology for Achieving High-Adhesion Ceramic Coatings
Obtaining a firmly bonded ceramic coating on metal is a challenge in surface engineering, which we overcome through proficient plasma spray processes.
Proprietary Bond Coat & Stress Transition Design:
To mitigate the significant difference in thermal expansion coefficient between ceramic and metal, we first apply a special metallic or alloy bond coat (e.g., NiCrAlY) onto the substrate. This "compliant transition layer" effectively absorbs stress and is key to achieving high adhesion and preventing ceramic layer spallation during thermal cycling.
Precise Control for Optimal Coating Structure:
We meticulously control plasma spray parameters to ensure alumina powder is fully melted, depositing to form a dense coating with a primarily lamellar structure, high micro-hardness, and low porosity. Through parameter optimization, we balance the coating's hardness, toughness, and bond strength.
Coating Finishing & Sealing Treatment:
The as-sprayed ceramic surface is precision ground with specialized abrasives to achieve a mirror finish suitable for sealing. For Ceramic coated valve ball used in strongly penetrating media, we apply special inorganic sealants for porosity sealing, filling the microscopic pores to achieve a near-fully dense state, maximizing its corrosion resistance and insulating properties.
Why Choose TongBall's Alumina Ceramic Coating Solution for Special Service Conditions?
Expert in Solving Combined "Insulation" & "Wear/Corrosion Resistance" Challenges:
We specialize in leveraging the intrinsic properties of ceramic coatings to address unique engineering problems that simultaneously demand electrical insulation and extreme physicochemical resistance, rather than offering only general wear solutions.
Mastery of Core Processes for Metal-Ceramic Heterostructure Bonding:
We possess deep technical know-how for achieving long-term, reliable bonding between ceramic coatings and metal substrates, from bond coat material selection to spray process control, forming a mature and reliable process system.
Focus on Enhancing System-Level Safety & Purity:
Our Alumina Ceramic Coated Valve Balls aim to enhance the reliability of the entire process system at the component level-whether by preventing unexpected failure from electrochemical corrosion or safeguarding high-purity production processes from metallic contamination.
When Your Application Exceeds the Scope of Conventional Wear & Corrosion Resistance
If your valve's operating environment involves electrolysis, stray currents, high corrosion risk from dissimilar metal connections, or media that requires absolute avoidance of metal ion contamination, then a surface solution combining excellent insulation with top-tier wear and corrosion resistance becomes essential. TongBall's Alumina Ceramic Coating Technology is precisely the engineered answer prepared for such high-end, specialized requirements.
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