Carbide or Ceramics Preparation Methods

The present invention provides a method for preparing a cemented carbide or ceramic body. Having Ⅳa or Ⅴa group consisting of WC and at least one element of the periodic table of the hard material is at least one carbide, nitride, carbonitride, or oxide phase composed of a carbonitride, and having a Fe, Co and / or Ni a binder phase composed of a proportion of 3-25% by mass, with a single or with multiple surface adjacent to each other.

Steps are as follows:

1) At least one surface of the following single sets 2-100μm thick first layer having a proportion of 2-25% by mass of the binder metal and at most 25% by volume or more of the family of the periodic table Ⅳa metal nitride or carbonitride and / or up to 10% by volume of the V, Nb, Ta and / or Cr carbides and / or carbonitrides, balance WC, wherein said metal nitride, carbon the amount of nitride or carbide of at least 0.01% by volume, characterized in that;

2) Disposed on the first layer 2 below the second layer to a thickness of 40μm, the ratio of nitrogen higher than the first layer and mainly composed of metals of the periodic table Ⅳa nitrides and / or carbonitrides, and having phase ratio of at most 10% by volume of the elements W, Mo, V, Ta, Nb, Cr carbide, nitride, carbonitride, or oxycarbonitride, and / or dissolved in the proportion of the hard material phase is at most 5 mass % of V, Nb, Ta and up to 2 mass% of Cr, Mo, W, and contains at most 15% by mass of the binder, wherein the amount of the phase-volume ratio of at least 0.01% and / or is soluble in the hard the amount of the material ratio is at least 0.01% by mass;

3) Provided in the second layer having a thickness of 2 to 100μm below the transition zone, wherein the composition gradually changes to a uniform hard metal or ceramic core inside the body of the composition.




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