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Fluid tight low friction coating systems for dynamically engaging load bearing surfaces

A low-friction, systematic technology, applied in the direction of coating, metal material coating process, parts in contact between valve elements and valve seats, etc., can solve problems such as wear, improper coating, local deformation of roughening, etc.

Inactive Publication Date: 2017-05-31
PRAXAIR ST TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, gas leakage may occur through the coating
Additionally, coatings lose lubricity and exhibit wear, making such coatings unsuitable
[0008] Among other problems, unacceptable galling and potential localized deformation can result if the applied coating is not sufficiently fluid impermeable and the gate and seat components are not sufficiently wear-resistant and lubricious, resulting in leakage of fluid through the coating and eventually through the valve

Method used

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  • Fluid tight low friction coating systems for dynamically engaging load bearing surfaces
  • Fluid tight low friction coating systems for dynamically engaging load bearing surfaces
  • Fluid tight low friction coating systems for dynamically engaging load bearing surfaces

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0070] Example 1 (leak test for the present invention- Figure 6 )

[0071] Using Super The coating process uses a powder blend of tungsten carbide-cobalt chromium material and metallic cobalt alloy to prepare the coating. The coating was applied to test samples approximately 2.8 inches in diameter and approximately 1.5 inches in thickness. A DLC low friction layer is applied to this base coat. DLC was applied using PaCVD.

[0072] Perform a high pressure leak test. After 10 minutes of testing, under an applied pressure of 10,000 psi, along Figure 6 No air bubbles were observed around the periphery of the test sample shown. The absence of bubbles at high pressure indicates that the coating with DLC and sealant prevents leaks from occurring.

example 2

[0073] Example 2 (Friction Test for the Invention at 10,000 psi - Figure 9 the orange line)

[0074] The friction behavior of the thermal spray coating system of the present invention was evaluated using a torsional compression test under conditions of 10,000 psi contact pressure without lubrication. The coating to be tested was Super coating. Super Coatings are deposited onto circular sample substrates. Another coating is the HVOF WC-CoCr coating, which is deposited onto a flat sample substrate. A DLC low-friction layer is applied to this base Super coating on. DLC was applied using Pa CVD.

[0075] While generating a pressure of 10,000 psi, the ring sample was spun. The torque transmission between the rotating annular cylinder and the flat sample is measured, and the coefficient of friction is calculated from the ratio of the transmitted torque to the applied pressure.

[0076] Figure 9 The results are shown in graphical form. The coating system maintained ...

example 3

[0077] Example 3 (Friction Test for the Invention at 30,000 psi - Figure 10 the orange line)

[0078] The friction behavior of the thermal spray coating system of the present invention was evaluated using a torsional compression test under conditions of 30,000 psi contact pressure using grease. The coating to be tested was Super coating. Super Coatings are deposited onto circular sample substrates. Another coating is the HVOF WC-CoCr coating, which is deposited onto a flat sample substrate. A DLC low-friction layer is applied to this base Super coating on. The DLC is applied using a PaCVD process.

[0079] While generating a pressure of 30,000 psi, the ring sample was spun. The torque transmission between the rotating annular cylinder and the flat sample is measured, and the coefficient of friction is calculated from the ratio of the transmitted torque to the applied pressure.

[0080] Figure 10 The results are shown in graphical form. The coating system main...

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Abstract

A protective coating system is described that is characterized by fluid impermeability and a reduced coefficient of friction. The coating system includes a carbide-based thermal spray composition; a low friction layer; and a sealant impregnated into the low friction layer. Unlike conventional materials, the coating systems of the present invention achieve and maintain sealing surfaces, without adversely impacting lubricity, wear resistance and corrosion resistance during the service life of the coated component.

Description

technical field [0001] The present invention generally relates to novel low-friction, fluid-impermeable protective coatings for various applications. In particular, the coating provides low friction and enhanced fluid impermeability for engaging the surfaces of the gate member and base member. [0002] Background of the invention [0003] Gate valves are typically used when a straight line of fluid flow with minimal flow restriction is required. Gate valves are an integral part of wellhead assemblies and piping systems used in a variety of supply and pumping lines, including oil and gas exploration and production, where pressures can range from 5,000 psi to 30,000 psi or more. Gate valves consist of a valve body positioned axially in a pipe through which fluid flows. The gate is located within the valve body and is typically a solid metal part with a hole extending through the part. In operation, the gate typically slides between two seats, which are circular ring assembli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00
CPCC23C4/10C23C16/27C23C28/00C23C28/042C23C28/044C23C28/046C23C4/067C23C4/18C10M103/02F16K3/0227F16K25/005F16K25/04C10M2201/0413
Inventor A·S·克里曼J·K·克纳普A·福伊尔施泰因
Owner PRAXAIR ST TECH INC