Coating system for tubular gripping components
View Patent ↗A gripping tool for gripping oilfield tubulars includes a gripping element having a substrate, and at least one gripping surface configured to engage an oilfield tubular, the at least one gripping surface being formed on the gripping element. The at least one gripping surface includes a coating on an outer surface of the substrate, the coating includes a carrier and a plurality of particles at least partially embedded in the carrier. The particles each have a hardness that is greater than a hardness of the carrier and a base metal of the gripping element, and the particles extend outward from the carrier and are configured to engage a structure that is gripped by the gripping tool.
1. A method for manufacturing a gripping tool, comprising:
forming a gripping surface on at least a portion of a substrate without creating a heat-affected zone in the substrate by applying a coating comprising a carrier and a plurality of particles onto the substrate; and
applying a sealant onto the coating after forming the coating on the at least a portion of the substrate,
wherein the plurality of particles have a hardness that is greater than a hardness of a base metal of the substrate and greater than a hardness of the carrier, and
wherein the plurality of particles extend at least partially outward from the carrier and are configured to at least partially embed into a material that is at least as hard as the base metal of the substrate.
2. The method of claim 1 , wherein forming the gripping surface comprises applying the coating to the outer surface of the substrate using at least one of: electro-deposition, laser-metal deposition, laser sintering, physical vapor deposition, chemical vapor deposition, plasma-assisted processing, ion implantation, powder metallurgy processing, or electroless deposition.
3. The method of claim 1 , further comprising surface treating an outer layer of the base metal of the substrate to produce a hardened layer extending a depth inward from the outer surface of the substrate, wherein the coating is formed at least partially on the hardened layer.
4. The method of claim 1 , wherein forming the gripping surface comprises:
at least partially immersing, for a predetermined amount of time, the substrate in a bath of the carrier with the plurality of particles suspended in the carrier; and
after the predetermined amount of time, removing the substrate from the bath.
5. The method of claim 4 , wherein at least partially immersing the substrate in the bath for the predetermined amount of time causes the coating to have a thickness of 30% to 60% of an average diameter of the plurality of particles.
6. The method of claim 1 , wherein the carrier includes one or more materials selected from the group consisting of: nickel alloy, copper alloy, cobalt alloy, tungsten, tungsten alloy, molybdenum alloy, titanium alloy, polymer, and nickel phosphorus.