Hard Composite with Deformable Constituent and Method of Applying to Earth-Engaging Tool
AssigneeNational Oilwell Varco, L.P.
InventorsHarold Sreshta, Eric F. Drake, Douglas B. Caraway
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Abstract
A hardmetal composite used as wear-resistant surfaces and inlays in earth-engaging equipment includes more than one hardphase. At least one hardphase has a high average particle size, for example, from 100 μm to 2000 μm. The hardphases vary in terms of particle size, hardness, and binder content, and at least one hardphase includes a particulate constituent capable of plastic deformation that comprises at least 1% residual porosity.
Claims24
A hardmetal composite comprising:
- a primary hardphase having an average particle size of from 100 μm to 2000 μm;
- at least one secondary hardphase having a particulate constituent capable of plastic deformation that has at least 1% residual porosity;
- wherein the total hardphase displays bi-modal or multi-modal particle size distribution.
An earth-engaging tool comprising hardsurfacing comprised of multiple carbide hard phases, varying in particle size, binder content, and hardness, wherein at least one hard phase comprises a deformable constituent with at least 1% residual porosity.
A method comprising:
- selecting one or more hardphases comprising a hardmetal;
- encapsulating particles of said one or more hardphases in a malleable matrix material to form a hardmetal composite;
- applying the desired amount of encapsulated particles to the surface of a substrate;
- and
- finishing the substrate by forging.
Dependencies are inferred from the claim text.