Antifriction coatings, methods of producing such coatings and articles including such coatings

A coated metal fastener, comprising:

• a first lubricious coating layer overlying the metal fastener, the first lubricious coating layer comprising a first lubricant providing to the first lubricious coating layer a first coefficient of friction;
• and
• a second lubricious coating layer overlying the first lubricious coating layer, the second lubricious coating layer comprising a second lubricant providing to the second lubricious coating layer a second coefficient of friction, wherein the second coefficient of friction is greater than the first coefficient of friction,
• wherein at least one of the first lubricious coating layer and the second lubricious coating layer further comprises a binder or a curable resin or comprises or is in the form of a dry film lubricant, wherein at least one of the first lubricious coating layer and the second lubricious coating layer further comprises the binder and the binder comprises one or more of an epoxy, an acrylic, a silicone, a phenolic resin, an inorganic silicate, waterglass and cellulose.

A coated metal fastener, comprising:

• a first lubricious coating layer overlying the metal fastener, the first lubricious coating layer comprising a first lubricant providing to the first lubricious coating layer a first coefficient of friction;
• and
• a second lubricious coating layer overlying the first lubricious coating layer, the second lubricious coating layer comprising a second lubricant providing to the second lubricious coating layer a second coefficient of friction, wherein the second coefficient of friction is greater than the first coefficient of friction,
• wherein at least one of the first lubricious coating layer and the second lubricious coating layer further comprises a binder or a curable resin or comprises or is in the form of a dry film lubricant, wherein at least one of the first lubricious coating layer and the second lubricious coating layer further comprises the curable resin.

A plurality of coated metal fasteners, comprising:

• a first lubricious coating layer overlying the substrate, the first lubricious coating layer comprising a first lubricant providing to the first lubricious coating layer a first coefficient of friction;
• and
• a second lubricious coating layer overlying the first lubricious coating layer, the second lubricious coating layer comprising a second lubricant providing to the second lubricious coating layer a second coefficient of friction, wherein the second coefficient of friction is greater than the first coefficient of friction,
• wherein when the coated metal fasteners include fasteners having at least two different geometries selected from the group consisting of captive washer bolts, flange head bolts and hexagonal head bolts, the fasteners having at least two different geometries have torque values, at a specified load, within a specified torque range and have an average torque value that is ±3 standard deviations within the specified torque range and the first lubricant has a first lubricity the second lubricant has a second lubricity and the first lubricity is lower than the second lubricity.

A plurality of coated metal fasteners, comprising:

• a first lubricious coating layer overlying the substrate, the first lubricious coating layer comprising a first lubricant providing to the first lubricious coating layer a first coefficient of friction;
• and
• a second lubricious coating layer overlying the first lubricious coating layer, the second lubricious coating layer comprising a second lubricant providing to the second lubricious coating layer a second coefficient of friction, wherein the second coefficient of friction is greater than the first coefficient of friction,
• wherein when the coated metal fasteners include fasteners having at least two different geometries selected from the group consisting of captive washer bolts, flange head bolts and hexagonal head bolts, the fasteners having at least two different geometries have torque values, at a specified load, within a specified torque range and have an average torque value that is ±3 standard deviations within the specified torque range, wherein at least one of the first lubricious coating layer and the second lubricious coating layer further comprises a binder and the binder comprises one or more of an epoxy, an acrylic, a silicone, a phenolic resin, an inorganic silicate, waterglass and cellulose.

A plurality of coated metal fasteners, comprising:

• a first lubricious coating layer overlying the substrate, the first lubricious coating layer comprising a first lubricant providing to the first lubricious coating layer a first coefficient of friction;
• and
• a second lubricious coating layer overlying the first lubricious coating layer, the second lubricious coating layer comprising a second lubricant providing to the second lubricious coating layer a second coefficient of friction, wherein the second coefficient of friction is greater than the first coefficient of friction,
• wherein when the coated metal fasteners include fasteners having at least two different geometries selected from the group consisting of captive washer bolts, flange head bolts and hexagonal head bolts, the fasteners having at least two different geometries have torque values, at a specified load, within a specified torque range and have an average torque value that is ±3 standard deviations within the specified torque range, wherein at least one of the first lubricious coating layer and the second lubricious coating layer further comprises a curable resin.