Wear-resistant composite coating formula to be used in valves

Abstract

The invention relates to a composite coating improving valve surface properties against wear and corrosion and providing long-term performance and safety advantages by increasing the durability of the valve.

Description

[0001] DESCRIPTION

[0002] WEAR-RESISTANT COMPOSITE COATING FORMULA TO BE USED

[0003] IN VALVES

[0004] Technical Field

[0005] The invention relates to a composite coating improving valve surface properties against wear and corrosion and providing long-term performance and safety advantages by increasing the durability of the valve.

[0006] Prior Art

[0007] Steel valves are used in land vehicles in the field of defense industry, in the automotive industry, in renewable energy sources such as wind turbines, in the maritime sector, and in many fields. Although these valves appear robust and reliable, their probability of being damaged is high when they are used in environments where adhesive, abrasive, erosive, and corrosive abrasives are present. In traditional methods, cast valve production is performed with various methods, however, they are not long-lasting.

[0008] With the formation of damages such as abrasion, erosion, and corrosion in the connection parts at the points providing sealing, especially on the inner surfaces of the valves produced nowadays, the shaft becomes unusable.

[0009] The publication document titled 'Absorption and Mechanical Properties of SiCp / PVDF Composites', discloses the absorption and mechanical properties of SiCp / PVDF composites. In the document, PVDF polymer has been selected as the matrix material, and after being liquefied by being dissolved in the solvent named Dimethylformamide (DMF), SiC particles in sizes of 5, 10, 14, and 28 micrometers were added into it. After the evaporation of the solvent, PVDF matrix 20%, 30%, 40%, 50%, and 60% SiC filled PMCs are produced. It is stated that the PVDF matrix composite with 5 mm size and 50% SiC addition by weight is of optimum property. The patent document numbered CN104610841 A, discloses nano-ceramic modified epoxy resin paint and the application thereof to metal valves.

[0010] When the studies existing in the prior art are examined, the need for the development of a composite coating improving valve surface properties against wear and corrosion and providing long-term performance and safety advantages by increasing the durability of the valve, has been felt.

[0011] Object of the Invention

[0012] The object of this invention is to develop a composite coating improving valve surface properties against wear and corrosion and providing long-term performance and safety advantages by increasing the durability of the valve.

[0013] Detailed Description of the Invention

[0014] A composite coating improving valve surface properties against wear and corrosion and providing long-term performance and safety advantages by increasing the durability of the valve, and comprises:

[0015] - Epoxy at a rate of 25-65% by weight,

[0016] Silicon carbide (SiC) at a rate of 30-60% by weight,

[0017] - Polyvinylidene fluoride (PVDF) powder at a rate of 5-15% by weight.

[0018] A composite is a combination of two or more phases that are chemically different from each other and insoluble.

[0019] Nowadays, composite materials is the name given to materials obtained by the placement of materials containing strong reinforcement material (continuous or discontinuous) into a weaker matrix. The matrix maintains the geometric arrangement of the fiber and transfers the load acting on the composite part to the reinforcement material.

[0020] The composite material obtained as a result has moderate mechanical performance. That is, the mechanical properties of the composite are superior to the mechanical properties of the matrix, whereas they are lower than the mechanical properties of the reinforcement material. That is, if the properties of the new material obtained possess new properties which the matrix and the reinforcement do not possess separately, it is a composite material.

[0021] Polymer matrix composite materials (Fiber Reinforced Plastics / Polymers) can be referred to as plastics. However, not all plastics are composite materials. Pure plastic polymers can become composite materials if they are reinforced with a reinforcement material. Any thermoset, thermoplastic, or elastomer material is referred to as a composite when it is reinforced with a fiber / particle.

[0022] Polymer Matrix + Filler / Reinforcement Material + Auxiliary Materials = Composite Material

[0023] In the composite coating subject to the invention, the matrix material has been selected as “epoxy”, the filler / reinforcement material as SiC, and the auxiliary material as PVDF, and a polymer matrix composite (PMC) coating material has been produced. The addition of SiC increases the wear strength of the epoxy -based composite coating, whereas PVDF increases the contact angle by lowering the surface tension and ensures the easy passage of the liquid from the valve inner surface whose friction coefficient has decreased.

[0024] In an exemplary application where the composite coating subject to the invention is applied, a valve produced by the casting method has been used. By the metal valve being sandblasted and its surface area and roughness being increased, the mechanical adhesion of the coating to the surface is ensured. After being sandblasted, the epoxy formula, the necessary mixture of which has been made, will be left to cure by being applied to the surface. In this way, the coating process enables the valve to be able to be used for a long time without being damaged. At the same time, due to the hardening of the composite coating subject to the invention during curing, a tighter, non-delaminating bonding process takes place.

[0025] For the increasing of the metal and composite coating interface adhesion strength, firstly the chemical cleaning of the outer surface of the metal part with a special liquid will be performed. Subsequently, the metal valve surface that will contact the coating at the interface is sandblasted, and the metal surface area is increased in this way. This process is very important especially for the increasing of mechanical bonding. The composite coating will be applied to the inner surface of the valve opened before assembly. By using the coating subject to the invention, a durability advantage will be provided compared to old uncoated metal valves in defense industry vehicles, in the chemical sector, in mud pump lines, and in the construction sector. At the same time, together with the new coating method, the safety coefficient will increase even further.

Claims

CLAIMS1. A composite coating improving valve surface properties against wear and corrosion and providing long-term performance and safety advantages by increasing the durability of the valve, characterized in that it comprises: epoxy, silicon carbide (SiC), polyvinylidene fluoride (PVDF) powder.

2. The composite coating according to claim 1, characterized in that it comprises epoxy at a rate of 25-65% by weight.

3. The composite coating according to claim 1, characterized in that it comprises SiC at a rate of 30-60% by weight.

4. The composite coating according to claim 1, characterized in that it comprises PVDF powder at a rate of 5-15% by weight.