Arc spraying

Plasma arc cutting Plasma-arc devices Plasma-arc furnace Plasma arc spray Plasma arc welding... 

Zinc arc spraying is an inexpensive process in terms of equipment and raw materials. Only 55—110 g/m is required for a standard 0.05—0.10 mm Zn thickness. It is more labor intensive, however. Grit blasting is a slow process, at a rate of 4.5 m /h. AppHcation of an adhesive paint layer is much quicker, 24 m /h, although the painted part must be baked or allowed to air dry. Arc sprayed 2inc is appHed at a rate of 9—36 m /h to maintain the plastic temperature below 65°C. The actual price of the product depends on part complexity, number of parts, and part size. A typical price in 1994 was in the range of 10—32/m. ... 

Each type of metallic coating process has some sort of hazard, whether it is thermal energy, the reactivity of molten salt or metal baths, particulates in the air from spray processes, poisonous gases from pack cementation and diffusion, or electrical hazards associated with arc spray or ion implantation. 

H. S. Savage and R. G. McCormack, Arc Sprayed Coatings for Electromagnetic Pulse Protection, USA-CERL Technical Report M-89 /15, U.S. Army Corps of Engineers, Washington, D.C., 1989. 

A multilayer-type structure probably due to cords in the molten zone between single arc sprayed (0.25 MPa) Ni droplets and steel substrate were found in AES point depth profiles [2.158]. That particular arc spraying condition turned out to yield the best adhesion. Plasma-sprayed AI2O3 layers separated from pre-oxidized Ni Substrate had a micrometer-thick NiO layer on the substrate-sided face and micrometer-deep oxide interdiffusion [2.159]. In this work also, AES point depth profiling substantiated technological assumptions about adhesion mechanisms. 

In cases where very high adherence is necessary an undercoating of sprayed molybdenum is applied. Owing to the volatile nature of its oxide this metal presents a clean surface to the workface and with most metals (except copper) very high adhesion is obtained. To a limited extent arc-sprayed aluminium bronze will also form a strongly adherent base coating. 

Recent advances in metal spraying include arc spraying, which claims higher application speeds, better adhesion and reduced oxide content in the coating. 

Birley, S. S., Hepples, W. and Holroyd, N. J. H., The Corrosion Protection of Weldable 7xxx Aluminium Alloys by Aluminium-based Arc Spray Coatings , in 3rd Int. Conf. on Aluminium Alloys Vol II, Sintef, Trondheim, 497-502 (1992)... 

Commercial coated samples were obtained. Coating thickness was nominal 2 mils for organic-metal filled coatings (approximately 50% metal filler). Zinc metal coatings were zinc arc spray and were thicker, 5 mils, but normal for that process. Test results for each fire parameter are given as follows ... 

In the present study DSC and TGA data were run on DuPont 910 and DuPont 951 instruments, respectively. Arapahoe Smoke Chamber results were obtained on a commercial apparatus. Coated samples used were commercially prepared zinc arc spray samples on Noryl FN 215 Structural Foam. 

In comparison with other wire and powder-formed coatings, arc sprayed coatings are generally more porous. This porosity is unacceptable for components requiring critical surface finishes, for which we use powder... 

The coating is applied by using flame, supersonic, and plasma-arc spraying. The deposited material consists of a mixture of quasiciystals and crystalline phases. The quasicrystal content of the surface ranges from 30-70%. 

A great advantage of /me are spray is that it can he applied to almost anv plastic. Zinc arc spray, also suitable for prototypes and small lots of materials, is less suited lor very small parts and parts having blind holes or complex interior surlaces. or w here warpage is a problem. 

Kallenberg, A., Vaszilcsin, N., and Brandi, W. 2007. Roughness factor evaluation of thermal arc sprayed skeleton nickel electrodes. Journal of Solid State Electrochemistry 11, 84—89. 

Tsung, T.T. et al.. Process development of a novel arc spray nanoparticle synthesis system (ASNSS) for preparation of a TiO, nanoparticle suspension, Int. J. Adv. Mamif. Technol., 24, 879, 2005. 

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