Pump liners and a method of cladding the same

Claim 3

The method of claim 1 wherein said step (c) is carried out by transmitting force to the grain along a primary axis, said layer extending about said axis and spaced therefrom, whereby force is transmitted by the grain away from said axis and against said layer.

Claim 4

The method of claim 2 including providing a die having a first chamber receiving said object, the die having a second chamber containing grain communicating with said grain in the cavity, said pressurizing of the grain in the cavity being carried out by pressurizing the grain in the second chamber.

Claim 5

The method of claim 3 including transmitting pressure from the grain in the second chamber to only a medial portion of the grain in the first chamber everywhere spaced from said layer.

Claim 6

The method of claim 1 wherein said object is cylindrical and said (a) step is carried out to apply said layer on an internal cylindrical surface of said object.

Claim 7

The method of claim 5 wherein said object comprise a mud pump liner.

Claim 8

The method of claim 1 wherein said layer, as applied to said surface includes at least one of the compositions set forth in the following table, admixed with a minor amount of a fugitive organic binder: TABLE ______________________________________ Nominal Composition Co--28.5Mo--17.5Cr--3.4Si Co--30Cr--12.5W--2.5C Co--28Cr--4W--1.1C Ni--16Cr--4Fe--3.3B--4.2Si--0.7C, plus up to 90% tungsten carbide Fe--35Cr--12Co--10Ni--5Si--2C, plus up to 90% tungsten carbide Cu--37Mn--10Ni--0.5La, plus up to 90% tungsten carbide Ni--19Mn--6Si--0.5B--4Cu--0.03 rare earth, plus up to 90% tungsten carbide Ni--13Cr--20Co--2.3B--4Si--4Fe, plus up to 90% tungsten carbide ______________________________________

Claim 9

The method of claim 7 wherein said mixture includes at least about 97% by weight of said composition, and at least about 1.0% by weight of said binder selected from the group consisting of cellulose acetate and hydrocarbon solvent.

Claim 10

The method of claim 1 wherein said layer thickness is between 1/16 inch and 1/8 inch, when said pressurization is effected.

Claim 11

The method of claim 1 wherein said surface is defined by a mud pump liner having cylindrical shape, said surface at the inner side of the cylinder, the powder in said layer selected from the group consisting of: (a) Co-Cr-W-C (b) Co-Mo-Cr-Si (c) Ni-Cr-Fe-Si-B (d) Ni-Mn-Si-Cu-B (e) No-Co-Cr-Si-Fe-B (f) Fe-Cr-Ni-Si-C (g) Cu-Mn-Ni and containing admixed powders of hard components selected from the group consisting of: metal oxides, carbides and borides.

Claim 12

The method of claim 1 wherein said layer consists essentially of a mixture of 30 to 92% by weight tungsten carbide and remaining metal alloy powder selected from the group consisting of: (a) Co-Cr-W-C (b) Ni-Cr-Fe-Si-B (c) Cu-Mn-Ni (d) Ni-Co-Cr-Fe-Si-B (e) Fe-Cr-Co-Ni-Si-C.