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Cemented Carbide Grinding Balls Φ1mm to Φ30mm

WC-Co Tungsten Carbide Grinding Balls 5mm 1kg HRA 93 Mirror Polish

$410.00

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WC-Co tungsten carbide cobalt grinding balls, 5mm, 1kg. Density 14.5-15.0 g/cm³, HRA 88-93, ≤0.001mm tolerance. Mirror polished, 10⁻⁹ g/h wear rate. Ultra-hard powder, mechanical alloying, SiC, B₄C grinding. Research grade.

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Description

WC-CO TUNGSTEN CARBIDE GRINDING BALLS 5MM 1KG HRA 93 MIRROR POLISH

RESEARCH GRADE MATERIAL

Product Overview
Tungsten Carbide Cobalt Grinding Balls (WC-Co, commonly known as tungsten steel grinding balls) are manufactured from high-purity tungsten carbide (WC) and metallic cobalt (Co) via vacuum high-pressure sintering into a single integrated body. With WC-Co 14.5-15.0 g/cm³ HRA 88-93 specifications, these grinding balls deliver the highest grinding kinetic energy among all commercially available grinding media—nearly 2× the density of stainless steel (7.9 g/cm³) and 2.5× that of zirconia (6.0 g/cm³). The balls feature mirror polished ≤0.001mm tolerance 10⁻⁹ g/h wear rate surface quality with zero pitting and zero porosity, ensuring exceptional sphericity and minimal wear. Purpose-built for ultra-hard powder mechanical alloying grinding, they achieve nano-scale particle refinement of materials such as silicon carbide, boron carbide, diamond micropowder, and cemented carbide alloys that conventional ceramic balls cannot effectively grind. This listing is priced for 5 mm diameter, 1 kg net weight. Custom sizes from Φ0.3 mm to Φ75 mm are available upon request at inquiry@atomfair.com.

Technical Specifications
PARAMETER DETAILS
Material Composition High-Purity Tungsten Carbide (WC) + Metallic Cobalt (Co) Binder
Manufacturing Process Vacuum High-Pressure Sintering, Single Integrated Body
Listing Specification Φ5 mm Diameter, 1 kg Net Weight
Density 14.5–15.0 g/cm³
Hardness HRA 88–93 (Mohs ≥9)
Standard Diameter Range Φ1 mm–Φ30 mm (Custom: 0.3 mm–75 mm Available)
Spherical Precision Tolerance ≤0.001 mm, Mirror Polished (Zero Pitting, Zero Porosity)
Bending Strength ≥2800 MPa
Wear Rate ~10⁻⁹ g/h (Ultra-Low, Negligible Media Loss)
Temperature & Corrosion Resistance High Temperature Resistant; Resistant to Weak Acids & Alkalis (Not for Strong HF or Concentrated Strong Alkali Long-Term Use)
Custom Configurations Custom diameters (0.3 mm–75 mm) and batch quantities are available upon request. Please contact us via email at inquiry@atomfair.com.

Key Features & Advantages
  • Ultra-High Density (14.5–15.0 g/cm³) for Maximum Grinding Kinetic Energy: With density 2.5× zirconia and nearly 2× stainless steel, WC-Co balls deliver the highest impact energy in planetary milling, achieving nano-scale refinement of ultra-hard materials (SiC, B₄C, diamond) that conventional ceramic media cannot process.
  • Extreme Wear Resistance with 10⁻⁹ g/h Wear Rate: Hardness exceeding HRA 88 (Mohs ≥9) with mirror-polished, pit-free surface ensures negligible media wear during extended high-speed grinding, minimizing impurity introduction into high-value powder products and reducing long-term consumable costs.
  • Low Contamination with Dense Non-Shedding Structure: The fully densified body with zero sand holes and mirror-polished surface resists flaking and spalling; only trace W and Co elements are released, making these balls suitable for ultra-hard powders where Fe, Al, and Zr contamination is unacceptable but trace W/Co doping is tolerable.
  • High Toughness with ≥2800 MPa Bending Strength: The cobalt binder phase absorbs impact stress, preventing fracture even under high-speed planetary rotation and high ball-to-powder ratio conditions, making the balls compatible with demanding mechanical alloying processes.

APPLICATION SCOPE: Laboratory research grinding of ultra-hard inorganic powders including silicon carbide (SiC), boron carbide (B₄C), diamond micropowder, silicon nitride (Si₃N₄), and cubic boron nitride (cBN). Mechanical alloying of cemented carbide powders, titanium alloys, magnesium alloys, and rare-earth alloys. High-purity refractory mineral grinding and high-hardness ceramic precursor processing. Industrial production of advanced ceramics, abrasive raw materials, gemstone powders, and hard cutting tool materials. Compatible with planetary ball mills, high-energy vibratory mills, roller ball mills, and mechanical alloying equipment. Supports both dry ultrafine grinding and wet slurry processing.
OPTIMAL PAIRING & PROHIBITED COMBINATIONS: Best paired with WC-Co cemented carbide grinding jars for hardness-matched operation that prevents mutual abrasion. Strictly prohibited for use in agate jars, PU/nylon/PTFE polymer jars, alumina corundum jars, or stainless steel jars—the extreme hardness of WC-Co balls will rapidly wear, scratch, or puncture soft jar materials, causing severe contamination of the sample.
IMPORTANT NOTICE: Not suitable for applications where W and Co impurities are strictly prohibited, such as lithium battery ternary materials (NCM), lithium iron phosphate (LFP), and high-purity electronic ceramics—tungsten and cobalt metal contamination will be introduced. Prohibit use in agate, plastic, or alumina jars; hard balls will scratch or wear through soft jar bodies. Avoid rapid thermal shock (sudden heating/cooling cycles); for extended high-temperature grinding, control rotation speed and allow cooling. These balls are expensive and intended exclusively for ultra-hard, difficult-to-grind materials; for ordinary ores and slurries, zirconia or stainless steel balls are recommended to reduce costs. Replace balls immediately if surface scratches, pitting, or spalling appear on the ball surface after wear, to prevent cobalt and tungsten debris from contaminating samples. For custom sizes and batch quantities, contact us at inquiry@atomfair.com.
TAILORED SOLUTIONS FOR RESEARCH
Contact our engineering team for technical support or official quotations.
EMAIL: inquiry@atomfair.com
Manufacturer: Atomfair LLC
Brand: ATOMFAIR®

These cemented carbide grinding balls exhibit extremely low self-wear and high corrosion resistance, minimizing contamination risk during milling. No specific environmental storage constraints are required beyond standard dry conditions, as the sintered WC-Co structure is chemically stable and non-reactive.

  • Contamination Risk: The low wear rate at the 10⁻⁹ g/h level ensures negligible material transfer to the milled sample.
  • Corrosion Resistance: The WC-Co composition provides inherent resistance to corrosion in most aqueous and organic milling environments.
  • Mechanical Integrity: High hardness (HRA 88–93) and toughness prevent fracture or deformation under typical ball milling impact loads.

Select the appropriate ball diameter and ball-to-powder weight ratio based on the target particle size and material hardness. Load the balls into the milling jar with the sample and process under the recommended rotational speed and duration.

Required Equipment: Ball mill (planetary, vibratory, or attritor), Milling jar compatible with WC-Co balls

  1. Select Ball Diameter
    Choose a ball diameter between 1 mm and 30 mm that matches the desired final particle size and mill type.
  2. Determine Ball-to-Powder Ratio
    Calculate the ball-to-powder weight ratio, typically ranging from 5:1 to 20:1 depending on material hardness.
  3. Load Milling Jar
    Transfer the selected balls and sample powder into the milling jar, ensuring the jar is no more than two-thirds full.
  4. Set Milling Parameters
    Configure the mill rotational speed and run time according to the manufacturer's recommendations for the specific jar and ball load.
  5. Start Milling Process
    Initiate the milling cycle and monitor for any abnormal noise or vibration that may indicate jar imbalance.
  6. Inspect Balls After Use
    Examine the balls for surface wear or chipping after each milling run to ensure continued performance.

How do cemented carbide grinding balls compare to YG6 carbide balls in toughness and impact resistance?

Cemented carbide grinding balls offer better toughness and impact resistance than YG6 carbide balls while maintaining high hardness (HRA 88–93) and excellent wear resistance, making them suitable for high-impact applications such as punching or extrusion balls.

Can WC-Co grinding balls be used for grinding high-purity quartz without contamination?

Yes, WC-Co grinding balls are well-suited for high-purity quartz grinding because they feature an extremely low wear rate at the 10⁻⁹ g/h level and almost no self-wear, resulting in minimal contamination risk.

What milling equipment specifications are required for using cemented carbide grinding balls?

Cemented carbide grinding balls have a high density of 14.5–15.0 g/cm³, so the milling equipment must handle such heavy media. They are available in diameters from 1 to 30 mm and maintain a precision tolerance of 0.001 mm, requiring a mill that can accommodate these sizes and precision standards.

Cemented carbide grinding balls (WC-Co) offer exceptional hardness (HRA 88-93) and ultra-low wear rates (10⁻⁹ g/h), making them ideal for ultra-fine grinding of super-hard and high-value materials like silicon carbide and high-purity quartz. Their high density (14.5-15.0 g/cm³) and precision tolerance (0.001 mm) provide consistent milling performance but require consideration of mill dynamics and potential cobalt contamination in ultra-pure processes.

Positive

  • Exceptional Hardness and Wear Resistance: Hardness of HRA 88-93 and an extremely low wear rate at the 10⁻⁹ g/h level deliver a service life dozens of times longer than ordinary tungsten steel balls, reducing media replacement frequency in high-abrasion milling applications.
  • Ultra-Low Contamination Risk: Near-zero self-wear combined with strong corrosion resistance minimizes material cross-contamination, making these balls suitable for ultra-fine grinding of super-hard, high-value materials such as silicon carbide and high-purity quartz.

Trade-offs

  • Default Size Requires Custom Ordering: The standard default is 5 mm diameter and 1 kg weight; all other sizes and quantities must be ordered via inquiry, potentially extending procurement lead times for non-standard laboratory needs.
  • Cobalt Binder May Affect Ultra-Pure Grinding: The WC-Co composition contains cobalt, which could be released as a trace contaminant during extended milling, posing a risk for processes requiring absolute chemical purity.

Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.

To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.

Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).

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