Pump with plunger having tribological coating
AssigneeCaterpillar Inc.
InventorsRobert Michael Campion, John Jay Truhan, Jr., Joshua Steffen, Shivangini Singh Hazari, Steven Charles Taylor, Michael James Pollard, Alan Ray Stockner
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Abstract
A pump is disclosed. The pump may include at least one pumping mechanism. The at least one pumping mechanism may include a barrel formed of a substrate having a bore and a plunger formed of a substrate and slidably disposed within the bore in the barrel. The pump may further include a coating disposed on the plunger. The coating may include a main layer containing a tribological material and a sacrificial break-in layer disposed on the main layer, the break-in layer containing a tribological material.
Claims16
A pump comprising:
- at least one pumping mechanism including:
- a barrel formed of a barrel substrate having a bore;
- and
- a plunger formed of a plunger substrate and slidably disposed within the bore in the barrel;
- and
- a coating disposed on the plunger, the coating including
- a support layer disposed on the plunger substrate, the support layer containing a support layer tribological material containing at least one of a DLC material and chromium carbide,
- a main layer disposed on the support layer, the main layer containing a main layer tribological material, and
- a sacrificial break-in layer disposed on the main layer, the break-in layer containing a break-in layer tribological material.
A method of forming a pump, the method comprising:
- providing a plunger;
- applying a coating to the plunger, wherein applying the coating includes
- applying a support layer of the coating to a substrate of the plunger, the support layer including a support layer tribological material containing at least one of a DLC material and chromium carbide,
- applying a main layer of the coating to the support layer, the main layer containing a main layer tribological material;
- and
- applying a sacrificial break-in layer of the coating to the main layer, the break-in layer containing a break-in layer tribological material;
- and
- slidably disposing the plunger within a bore, the bore being located in a barrel.
A pump comprising:
- at least one pumping mechanism configured to be fluidly connected to a source of cryogenic fluid, the at least one pumping mechanism including:
- a barrel formed of stainless steel, the barrel including a bore, the bore having a nickel-plated surface;
- and
- a plunger formed of stainless steel, the plunger being slidably disposed within the bore in the barrel, wherein the at least one pumping mechanism is configured to pressurize the cryogenic fluid between the plunger and the barrel;
- and
- a coating disposed on the plunger, the coating including:
- a support layer containing a diamond-like carbon (DLC) material;
- a main layer disposed on the support layer, the main layer containing amorphous diamond-like carbon (ADLC);
- and
- a sacrificial break-in layer disposed on the main layer, the break-in layer containing a DLC material.
Dependencies are inferred from the claim text.