Cemented Carbide Binder Grade
99.8% submicron cobalt binder powder for carbide inserts and diamond tool bonds. O < 0.8%, magnetic assay certified, extra-fine grades for ultrafine carbide lines.
QUICK ANSWER
Submicron cobalt powder — FSSS 0.5-1.5 µm, high purity — is the metallic binder of the cemented carbide industry: milled with carbide powder, pressed, and sintered into cutting inserts, mining tools, and wear parts where cobalt's unique wetting of carbides creates the hardness-toughness combination no other binder matches. It is also the binder grade for diamond tools and a feedstock for cobalt chemicals and magnets.
Cobalt's role in hardmetals is irreplaceable chemistry: it wets carbide surfaces perfectly, dissolves and reprecipitates carbide during liquid-phase sintering, and yields a binder phase both strong and ductile. As carbide grains have shrunk into the ultrafine range (0.2-0.5 µm), binder powder has had to shrink with them — submicron cobalt mills faster, distributes more uniformly, and sinters at lower temperature, all of which preserve the fine carbide grain structure that modern insert grades depend on. Buyers are carbide producers purchasing on FSSS size, oxygen content (below 0.8% for submicron), and magnetic/certified purity — cobalt powder is a strategic raw material bought under long-term agreements.
MATERIAL DATA
Lot-level controls focus on the chemistry, particle characteristics, and process values that influence manufacturing consistency and finished-part performance.
| Element | Content | Performance Role |
|---|---|---|
| Cobalt (Co) | > 99.8 wt% | Binder metal — purity governs wetting and magnetic quality |
| Oxygen (O) | < 0.8 wt% (submicron grades) | Oxide inhibits milling distribution and sintering |
| Carbon (C) | < 0.05 wt% | Carbon shifts the carbide carbon balance in sintering |
| Nickel + iron | < 0.15 wt% combined | Impurity limits per hardmetal industry practice |
| Other metals | < 0.05 wt% combined | Trace control for magnetic and chemical grade uses |
Final limits can be aligned with the agreed purchase specification.
APPLICATIONS
Cemented carbide production consumes the majority of submicron cobalt: cutting tool inserts, solid carbide drills and end mills, mining and construction tool tips, and wear parts are all carbide-cobalt composites, and every producer mills cobalt binder with carbide in their grade lines. The shift to ultrafine carbide grades for high-performance milling and micro-drilling has tightened cobalt specifications — finer, cleaner binder powder with narrow oxygen limits — making qualified submicron cobalt a supply-chain-critical material. Producers qualify suppliers across months of milling and sintering trials, then buy under annual frameworks.
Diamond tool manufacturing is the second pillar: cobalt is the classic bond for stone-cutting saw segments and core drills, wetting both diamond and the carbide/filler phases, and submicron cobalt sinters at the lower temperatures that protect diamond grit. Cobalt powder also feeds cobalt chemical production (sulfates, oxides for batteries and catalysts), magnetic materials, and sintered cobalt-chrome components — diversified demand that keeps the product strategically important beyond tooling.
CARBIDE & DIAMOND TOOL MATRIX POWDERS
CUSTOM SUPPLY
We supply submicron cobalt in standard binder grades (FSSS 0.5-1.5 µm, O < 0.8%), extra-fine grades for ultrafine carbide lines, and coarser cuts for diamond tool bonds, with certified magnetic cobalt content and full impurity panels per lot. Stable long-term supply arrangements, trial quantities for grade development, and consistent lots backed by retained samples are standard. Cobalt is not under Chinese export control — supply is routine.
We supply submicron cobalt in standard binder grades (FSSS 0.5-1.5 µm, O < 0.8%), extra-fine grades for ultrafine carbide lines, and coarser cuts for diamond tool bonds, with certified magnetic cobalt content and full impurity panels per lot.
Stable long-term supply arrangements, trial quantities for grade development, and consistent lots backed by retained samples are standard.
Cobalt is not under Chinese export control — supply is routine.
MATERIAL COMPARISON
| Comparison Point | This Product | Coarse Cobalt |
|---|---|---|
| Milling time to distribution | Short — mills into blend quickly | Long — extended attrition |
| Sintering temperature | Lower — higher activity | Higher |
| Suitability for ultrafine grades | Required | Inadequate — coarse pools in microstructure |
| Oxygen sensitivity | Higher surface area — needs care | More forgiving |
| Cost | Premium | Lower |
| Best use | Ultrafine/submicron carbide grades | Conventional grades, diamond tools |
TECHNICAL FAQ
Need a different chemistry, particle range, or processing route? Our material team can review the requirement and supply window.
Match binder fineness to carbide fineness — 0.2-0.5 µm carbide grades need 0.5-0.8 µm cobalt to distribute uniformly in milling and avoid binder pools. We supply matched pairs on request.
Oxygen consumes carbon during sintering (CO formation), shifting the critical carbon balance of the carbide grade into eta-phase or porosity territory. Submicron cobalt below 0.8% O keeps the carbon window manageable — certified per lot.
Yes — carbide producers buy cobalt under framework contracts, and we structure annual volumes with lot consistency guarantees and retained samples for traceability.
Yes — the coarser 1.5-5 µm cuts serve saw segment and core drill bonds, sintering below diamond-damaging temperatures. Many customers blend our cobalt with our FeCuCo pre-alloyed matrix powders.
No. Cobalt is not on China's export licensing lists — supply ships under standard trade terms.
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