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Advanced Wear Materials

Tungsten Carbide Mechanical Seal

Tungsten Carbide Mechanical Seal ⚡ Extreme Pressure Grade

Technical Data

  • Binder Alloy: 6% Cobalt / 6% Nickel
  • Hardness (HV): 1300 – 1600 HV
  • Apparent Density: 14.5 – 15.0 g/cm³
  • Thermal Cond.: 70 – 80 W/m·K
  • Tensile Strength: 1,800 MPa
  • Compressive Str.: 4,500 MPa

High-Strength Sealing Faces

Tungsten Carbide (WC) represents one of the most durable seal face materials in the mechanical sealing industry. Composed of hard carbide grains cemented together by a metallic binder (typically Cobalt or Nickel), Tungsten Carbide offers high fracture toughness and compressive strength, preventing face breakage under extreme torque or high-pressure starts.

Micro Engineering designs and manufactures custom Tungsten Carbide seal faces, rings, bushings, and wear sleeves. Cobalt-bonded grades are selected for high-pressure oil refinery pumps due to their outstanding hardness, while Nickel-bonded grades are preferred for corrosive chemical services due to their superior chemical resistance.

Highly recommended for slurry pumps, oil refinery pipeline valves, high-pressure booster systems, and mud mixers.

Features & Benefits

Providing extreme structural reliability in high-impact applications.

Superior Fracture Toughness

Unlike brittle oxide ceramics, Tungsten Carbide's metallic binder matrix absorbs high impact shocks and severe pressure fluctuations without cracking.

High Thermal Conductivity

Rapidly dissipates heat away from the sliding contact surfaces. Reduces surface micro-cracking (heat checking) and prevents vapor flashing of buffer fluids.

Extreme Wear Resistance

Hardness levels protect the seal face against scouring from suspended solids, sand slurries, coal ash, and calcified crystal formations.

Tailored Binder Alloys

Nickel binders offer corrosion protection in acids and salt waters, while cobalt binders offer maximum structural hardness in pipeline services.

Engineering & Performance Factors

Comparing Cobalt and Nickel binder grade metrics.

Parameters Cobalt Binder (WC-Co) Nickel Binder (WC-Ni)
Binder Content 6% – 8% Cobalt (Co) 6% – 8% Nickel (Ni)
Vickers Hardness (HV) 1450 – 1600 HV 1300 – 1450 HV
Fracture Toughness 9.5 – 11.5 MPa·m½ 8.5 – 10.0 MPa·m½
Chemical Resistance Low (Cobalt leaches in acids) Good (Resists organic acids & salt water)
Thermal Conductivity 80 W/m·K 70 W/m·K
Typical Applications Oil pipeline booster pumps, heavy oil refining, coal slurry mixers. Chemical processing, sea water injection pumps, corrosive paper mill liquors.

Typical Applications

High-reliability carbide elements installed across vital industrial setups.

01

Oil & Gas Pipeline Pumps

High-torque pipeline transfer pumps handling heavy crude oil and volatile hydrocarbons.

02

Abrasive Slurry Pumps

Mineral processing pumps, tailings, and coal wash plants where hard particles are present.

03

High-Pressure Feed Pumps

Boiler feedwater and pipeline boosters operating under high pressures and torque loads.

04

Wear Sleeves & Bushings

Protects pump shafts from wear under packing glands and rotary seal collars.

Why Choose Our Tungsten Seals?

Micro Engineering supplies premium-grade Tungsten Carbide rings custom-ground and polished to guarantee durability under severe mechanical loads.

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1-2 Light Band Flatness

Our seals undergo optical lapping, ensuring contact surfaces are flat within 0.3 - 0.6 microns for tight pressure containment.

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Tailored Binder Alloys

Select Cobalt-bonded grades for load-bearing structures or Nickel-bonded grades for corrosive acid services.

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Precision Grinding

Ground using advanced CNC equipment to hold dimensions within ±0.005mm tolerances for direct shaft matches.

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Ultra-Fine Mirror Polish

Faces are polished to a mirror finish (< 0.1 µm Ra roughness), minimizing boundary friction and wear.