Abstract

A composite tungsten carbide insert (B, I) with heterogeneous composition and structure has a working part (W) and a non-working part (N). The working part (W) is made of a tungsten carbide material consisting of tungsten carbide powder and cobalt powder or nickel. The non-working part (N) is made of a low density tungsten carbide material consisting of titanium carbide powder, tungsten carbide powder, and cobalt powder or nickel powder. During pressing, the tungsten carbide material for the working part (W) and the low density tungsten carbide material for the non-working part (N) are weighed and added to a steel die successively for molding and then sintering. The non-working part (N) which accounts for most of the overall product volume has low density and less material consumption, and can greatly reduce the raw material costs of the product, significantly improving the performance-cost ratio of the insert (B, I).

IPC Classes  ?

• E21B 10/567 - Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
• C04B 35/56 - Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on carbides
• B24D 18/00 - Manufacture of grinding tools, e.g. wheels, not otherwise provided for
• C22C 29/08 - Alloys based on carbides, oxides, borides, nitrides or silicides, e.g. cermets, or other metal compounds, e. g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
• B22F 9/04 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using physical processes starting from solid material, e.g. by crushing, grinding or milling
• B22F 7/02 - Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting of composite layers
• E21B 10/52 - Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type with chisel- or button-type inserts

Goods & Services

(1) Dynamic seals; mechanical seals; metal engine gaskets for vehicles; oil seals; pump seals; hardware springs; box springs; heat exchangers; couplings for machines; machine couplings and transmission components; Pumps as parts of machines, motors and engines; insulating washers; surveying instruments.

Abstract

Disclosed are a light-weight gradient cemented carbide sealing ring and a method for manufacturing same, the sealing ring consisting of a working part and a non-working part; the working part consisting of 90-94% by weight of tungsten carbide and 6-10% by weight of nickel or cobalt, the thickness thereof being 1.0 - 2.5 mm; the non-working part consisting of 40-60% by weight of titanium carbide powder, 10-18% by weight of nickel powder, 22-50% by weight of tungsten carbide powder. During pressing, the cemented carbide material used in the working part is weighed first and added into a steel mould and flattened by a scraper, then the light-weight cemented carbide material used in the non-working part is weighed and added into the steel mold and flattened by the scraper; they are moulded by application of pressure and then placed into a furnace for sintering, so that a gradient cemented carbide sealing ring with two parts having different compositions is obtained. The present invention has the advantages of reduced density, saved tungsten resources and low costs, when compared with the cemented carbide sealing ring produced by employing tungsten carbide, nickel, or cobalt throughout; and can be used in seals and shaft sleeve of pumps and kettles.

IPC Classes  ?

• F16J 9/26 - Piston-rings, seats therefor; Ring sealings of similar construction in general characterised by the use of particular materials
• B22F 3/12 - Both compacting and sintering
• C22C 29/08 - Alloys based on carbides, oxides, borides, nitrides or silicides, e.g. cermets, or other metal compounds, e. g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
• C22C 29/10 - Alloys based on carbides, oxides, borides, nitrides or silicides, e.g. cermets, or other metal compounds, e. g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on titanium carbide