11/06/2026
Most people who use tungsten carbide buttons have never seen how they're made.
It starts as ore in the ground and ends up as one of the hardest engineered materials on earth.
Here's a basic overview of the process:
1️⃣ Carburisation: Tungsten ore is refined and reacted with carbon at ~1500°C to form tungsten carbide powder. Grain size at this stage, typically 0.5 to 5 microns, directly influences the hardness and toughness of the final button.
2️⃣ Mixing: Tungsten Carbide powder is blended with cobalt (6–25% by weight, depending on the application). Cobalt is the binder; it provides the toughness that stops a purely ceramic material from shattering on impact. The mix is ground in a ball mill to a uniform slurry, then spray dried for pressing.
3️⃣ Die pressing: The dried powder is compacted under high pressure in a CNC-controlled die. The button takes its basic shape here, hemisphere, ballistic, conical, chisel, but at this point it's fragile and far from its final hardness.
4️⃣ Sintering: The pressed button goes into a furnace at 1380–1500°C for 1–2 hours. The cobalt reaches the liquid phase and flows between the WC grains, bonding them into a dense, continuous matrix. The button shrinks roughly 20% and reaches close to its final density of 15 g/cm³.
5️⃣ Diamond grinding + QC: Only diamond tooling can finish a sintered carbide button. Final geometry, surface finish, and dimensional tolerances are ground to spec. Hardness and microstructure are checked before anything leaves the floor.
The result: ~1600 Vickers hardness. Near-diamond toughness-to-hardness ratio. Built to take hundreds of thousands of impacts against hard rock.
What part of this process do you think gets compromised most in low-grade product? We have an opinion, but we’re curious to hear yours. Comment below ⬇️
