Pump for dispensing resins
AssigneeNordson Corporation
InventorsHerman E. Turner, Jr., Mario Romanin
Life of this patent
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Abstract
A gear pump for metering resins is provided having the surfaces of interacting internal metal parts coated with a metal-based material to prevent seizing of the interacting moving parts as a result of resin curing therebetween. Parts made from such materials as heat treated carbon steel and stainless steel are preferably coated with a nitride, carbide or oxide of such metals as tungsten, titanium, aluminum and chromium at a thickness of between about 2-5 microns. The coating is applied to the surface of any part that comes in heated contact with the surface of another relatively moving part. The resulting gear pump exhibits high wear resistance, longevity, and low maintenance requirements.
Claims12
A pump for dispensing resin, the pump comprised of a plurality of internal, relatively moving parts with at least two of the internal parts being metallic and having interacting surfaces wherein one of the two metallic internal moving parts is coated with an underlayer of titanium aluminum nitride and an outer layer of tungsten carbide carbon and the other of the two metallic internal parts is coated with titanium aluminum nitride.
A gear pump for dispensing resin, the pump comprised of metallic internal, relatively moving parts including a shaft and a bushing, said shaft and said bushing having respective metallic interacting surfaces, wherein each of said metallic interacting surfaces is coated with at least one coating material selected from the group consisting of:
- a metal-based nitride, a metal-based carbide, and a metal-based oxide.
A gear pump for dispensing resin, the pump comprised of metallic internal, relatively moving parts including shafts, bearings, plates and gears having metallic interacting surfaces, wherein each of said metallic interacting surfaces are coated with at least one coating material selected from the group consisting of:
- a metal-based nitride, a metal-based carbide, and a metal-based oxide, wherein the two internal, relatively moving parts include a shaft received by a bearing and wherein the shaft is coated with a layer of titanium aluminum nitride and a second layer of tungsten carbide carbon and the bearing is coated with titanium aluminum nitride.
Dependencies are inferred from the claim text.