Arc Wire Spray Molybdenum Wire
Arc wire spray is a method to produce spray molybdenum wire. The wire arc spray process, like plasma spraying, requires an electrical heat source to melt materials. In this case, the feedstock consists of two conductive metal wires. These two wires act as electrodes that are continuously consumed as the tips are melted by heat from the electrical arc that is struck between them. An atomizing gas shears off the molten droplets and propels them toward the substrate.
The atomizing gas is usually compressed air, but it can also be an inert gas such as nitrogen or argon. Compressed air causes oxidation of metal particles, resulting in a large amount of metal oxide in the coating. Because of this, the coating is harder and more difficult to machine than the source material of the coating. This can be a disadvantage because some coatings have to be ground. However, the increased hardness can also enhance wear resistance.
In addition, the temperature of the arc far exceeds the melting point of the sprayed material, resulting in the formation of superheated particles. Consequently, localized metallurgical interactions or diffusion zones develop, which enable achievement of good cohesive and adhesive strengths.
Process of using arc wire spray to produce spray molybdenum wire also operates at higher spray rates than the other thermal spray processes. The spray rate, which is dependent on the applied current, makes this process relatively economical.The process is suited for fragile applications of metals onto composite substrates, as well as for applying hard wear coatings such as molybdenum.
Wire Spray processes lend themselves to on-site coating applications due to their ease of portability and simplicity of required support services.
There is disclosed a sliding surface working method using wire-explosion spray coating according to which the inner surface of an aluminium alloy cylinder is wire-explosion spray coated using a molybdenum wire, molybdenum-tungsten alloy wire, or tungsten wire. Next, the inner surface is alternately and repeatedly wire-explosion spray coated by alternately wire-explosion spraying a carbon steel wire and a wire of a material having good seizure resistance and wear resistance characteristics. Finally, the inner surface thus coated is ground and finished.
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