SINTERED CARBIDES / WIDIA /

tool material obtained by sintering powder of metal carbides, for example tungsten, titanium, less tantalum, niobium, zirconium or chromium.

Road mills

Indexable inserts

Mills

We buy the following scrap sintered carbides:

  • Thread mills
  • Taps
  • Processing
  • Drills
  • Bore cutter
  • Mills
  • Sinters
  • Planer blades
  • Barker knives
  • Wood cutting knives
  • Detachable mills
  • Balls
  • Dies
  • Precision elements
  • Precision tools
  • Shaping knives
  • Powder
  • Rollers
  • Sludge
  • Cutting tools
  • Special tools
  • Dies
  • Dust
  • Stylus
  • Wearing parts
  • Tools
  • Counterpoints
  • Drawing dies
  • Chips
  • Reamers
  • Countersinks
  • Road mills
  • Rolling rings
  • Indexable inserts
  • Indexable inserts
  • Cutting tools
  • Waste
  • Mining tools
  • Sleeves
  • Turning tools
  • Parts of dies
  • Rotary files
  • Knives for paper
  • Structural parts

The particulate carbides are compressible under the influence of heat and pressure. The binder for sintered carbides is cobalt, sometimes nickel or vanadium.

The elements made of sintered carbides are characterized by high wear resistance, hardness (900-1600 HV) and are less fragile than stellites. The sintered carbides retain their cutting properties up to 850°C.
The sintered carbides are used for the production of cutting elements of various types of cutting tools, including turning tools, drills, mills.
Used as a tool for machining allow for multiple increase of cutting speed. They are suitable for machining of porcelain, hardened steel, white cast iron and other materials. They are also used for the reinforcement of mining tools (two prong bits) for drilling blast holes, blade planers, pillar of drilling crowns, rotary-impact drills.

The sintered carbides are used also for the production of broaching mesh, drill heads, dental drills, lathe centres, drawing dies.

In Poland the sintered carbides were produced for decades by Huta Baildon in Katowice.

A disadvantage of sintered carbides is their fragility. With this material only small plates are produced which are attached to the body of cutting tools in place of a blade.

With the body they may be connected:
• permanently through brazing – after use the plates are sharpened, which is time consuming and expensive
• releasably by various mechanical fasteners (indexable inserts) – after use the insert or blade is exchanged.

The indexable inserts are most often coated with layers of TiC, TiC and Al2O3 and additionally with third layer of TiN or with more layers of different combinations of these materials. There is an additional method to increase the durability of the insert by creasing.

The name „widia” comes from the German „wie Diamant”, which means „as diamond”.

In different countries the sintered carbides have their own names, for example:
• pobiedit – in Russia
• seco or coromant – in Sweden
• carboloy, carbide or ramet – in the USA
• prolit – in UK
• Hartmetall – in Germany.

The tools made entirely of sintered carbides are marked with a shortcut VHM (in German: Vollhartmetall).