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US 4,230,462 AGranted
Method of improving tool life of TiC base tools
AssigneeFord Motor Company
InventorDavid Moskowitz
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AssigneeFord Motor Company
InventorDavid Moskowitz
Estimating the term…
A method of making cemented titanium carbide base cutting tools with increased tool life is disclosed. Substantially unoxidized carbide and binder metal powders are ground to a sub-micron particle size in the presence of a low-boiling oxidation-inhibiting ingredient covering the particles of said powders. A low-boiling pressing aid is added. The ground powders are then subjected to air drying to evaporate said oxidation inhibiting liquid ingredient and the pressing aid consisting preferably of polyethylene glycol. After compacting the waxed ground particles to a predetermined configuration, the compact is first heated to volatize the wax at an appropriate temperature and critically in the presence of a nitrogen based atmosphere which may contain 0-10% H.sub.2. The dewaxed compact is then heated to a higher second temperature level for effecting sintering in the presence of a vacuum.
A method of making cemented titanium carbide based cutting tools, wherein substantially unoxidized titanium carbide, other refractory carbides of groups 4, 5 and 6 transition metals of the periodic table, and binder metal powders are mixed and ground to sub-micron particle size in the presence of an oxidation inhibiting liquid ingredient covering the particles of said powders, the titanium carbide constituting a major proportion of the mixture, displacing said liquid ingredient with a low-boiling pressing aid, compacting the ground powder particles under ambient conditions to form a shape having some degree of porosity to permit penetration of gases into the compact, then firstly heating the shape to volatilize the pressing agent, and then secondly heating the shape in a vacuum to a higher temperature level for effecting sintering of said shape, said first heating being carried out under a flowing nitrogen based atmosphere containing 0-10% H.sub.2.
A method for improving the tool life of a finishing grade titanium carbide cutting tool, said cutting tool containing a binder constituent consisting of 10-50% of the admixture and consisting essentially of a particulate having elemental or a combined form of nickel, chromium and molybdenum, the chromium, if present, being present in an amount measured as elemental chromium in the range between 10-40% of said nickel and said molybdenum being present in an amount between 25-70% of said binder, the method comprising:
Dependencies are inferred from the claim text.