Overview
Micro-grain cemented carbide is a composite material composed of tungsten carbide (WC) particles bonded with a cobalt (Co) matrix, featuring grain sizes typically below 1 micron. Its fine microstructure enhances hardness and fracture toughness, making it ideal for high-precision applications. First developed in the 1920s, modern micro-grain variants emerged in the 1980s with advanced sintering techniques. They outperform conventional carbides in demanding environments, such as high-speed machining and abrasive wear conditions.
Physical and Chemical Properties
The material’s ultra-fine grain structure (0.2–0.8 µm) contributes to a Vickers hardness of 1,500–2,200 HV, surpassing standard carbides. Its compressive strength reaches 6 GPa, with thermal stability up to 600°C. Chemically, it resists corrosion from oils, alkalis, and weak acids but degrades in nitric-hydrofluoric mixtures. The cobalt binder (3–12% by weight) balances hardness and ductility, though it necessitates careful handling due to potential health risks.
Main Applications
Micro-grain carbides dominate precision cutting tools (end mills, inserts) for aerospace alloys and hardened steels. Their wear resistance suits mining equipment (drill bits, crusher liners) and injection molds for plastics. In electronics, they fabricate wire-drawing dies and micro-drills for PCB production. Medical applications include surgical tools and dental burs, leveraging their biocompatibility when coated.
Safety and Storage
Dust from machining or grinding poses inhalation hazards due to cobalt content. Work areas require HEPA filtration and NIOSH-approved respirators. Solid products are stable but should be stored away from oxidizers. Disposal must comply with local regulations for heavy metals. Recycling through carbide reclaimers is common to recover tungsten and cobalt, reducing environmental impact.
B2B Procurement Guide
Buyers should prioritize grain size uniformity and cobalt percentage based on application needs. ISO 513 or FEPA standards define grades for specific uses (e.g., K10 for general machining, M20 for stainless steel). Suppliers often provide test reports for density, hardness, and transverse rupture strength. Bulk orders (100+ kg) may attract 10–20% discounts, though lead times vary with alloy complexity.
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