Pre-alloyed powder and its use in the manufacture of diamond tools
AssigneeN.V. Union Miniere S.A.
InventorRoger Standaert
Life of this patent
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Abstract
A powder for sintering to manufacture a diamond tool has an average particle size of less than 8 μm and a loss of mass by reduction in hydrogen of less than 3% and contains 10-80% Fe, up to 40% Co, up to 60% Ni and up to 15% M. M is present, at least partially, in the oxidized state and representing one or more of the elements Mn, Cr, V., Al, Mo and Ti, the balance being unavoidable impurities. This powder may be sintered at 650-1000° C. to give a matrix having a high hardness.
Claims12
In a method of manufacturing diamond tools comprising hot sintering a mixture of diamonds and a binder material, the improvement comprising using a pre-alloyed powder as a binder material, wherein
- the powder has an average particle size of less than 8 μm as measured with the Fisher Sub Sieve Sizer and a loss of mass by reduction in hydrogen of less than 3% as measured according to the standard ISO 4491-2:1989, and
- the powder contains, in % by weight, 10-80% of iron, up to 40% of cobalt, up to 60% of nickel and up to 15% of M, wherein M is present, at least partially, in an oxidized state and represents one or more of the elements Mn, Cr, V, Al, Mo and Ti, the other components in the powder consisting of unavoidable impurities.
A method of manufacturing a diamond tool, comprising:
- hot sintering a mixture of diamonds and a powder comprising iron as a binder,
- wherein the powder has an average particle size of less than 8 μm as measured with the Fisher Sub Sieve Sizer and a loss of mass by reduction in hydrogen of less than 3% as measured according to the standard ISO 4491-2:1989, and
- the powder contains, in % by weight, 10-80% of iron, up to 40% of cobalt, up to 60% of nickel and up to 15% of M, wherein M is present, at least partially, in an oxidized state and represents one or more of the elements Mn, Cr, V, Al, Mo and Ti, the other components in the powder consisting of unavoidable impurities.
A pre-alloyed powder composition for sintering, comprising:
- iron to serve as a binder,
- wherein the powder has an average particle size of less than 8 μm as measured with the Fisher Sub Sieve Sizer and a loss of mass by reduction in hydrogen of less than 3% as measured according to the standard ISO 4491-2:1989, and
- the powder contains, in % by weight, 10-80% of iron, with the balance including up to 40% of cobalt, up to 60% of nickel and up to 15% of M, wherein M is present, at least partially, in an oxidized state and represents one or more of the elements Mn, Cr, V, Al, Mo and Ti, and unavoidable impurities.
Dependencies are inferred from the claim text.