Thermal Spray Tips - Swinburne University of Technology

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Compiled by Jo Ann Gan, Edited and advised by Christopher C. Berndt Swinburne University of Technology Thermal Spray Group (SwinTS) Please contact Prof. Christopher Berndt at cberndt @swin.edu.au for further enquiries 2.8. Flame Spray Guns Combustible gas serves as the heat source to melt the coating material in flame spray guns. Materials are in the form of rod, wire, or powder, most flame spray guns can be adapted to several combinations of gases to balance operating cost and coating properties. Acetylene, propane, methyl-acetylenepropadiene (MAPP) gas, and hydrogen, along with oxygen, are typical flame spray gases. In general, changing the nozzle and/or air cap is all that is required to adapt the gun to different alloys, wire sizes, or gases. The diagrams depict powder and wire flame spray guns. For all practical purposes, the rod and wire guns are similar. Cross sections of typical flame spray guns. (a) Wire or rod. (b) Powder. Information and data acquired from ASM International Thermal Spray Society website at http://asmcommunity.asminternational.org/portal/site/tss/SprayTips/ 14 Back to TOC Back to Overview
Compiled by Jo Ann Gan, Edited and advised by Christopher C. Berndt Swinburne University of Technology Thermal Spray Group (SwinTS) Please contact Prof. Christopher Berndt at cberndt @swin.edu.au for further enquiries Flame temperatures and characteristics depend on the oxygen-to-fuel gas ratio and pressure. The flame spray process is characterized by low capital investment, high deposition rates and efficiencies, and relative ease of operation and cost of equipment maintenance. In general, as-deposited (or cold spray) flame-sprayed coatings exhibit lower bond strengths, higher porosity, a narrower working temperature range, and higher heat transmittal to the substrate than most other thermal spray processes. The flame spray process is frequently selected for the reclamation of worn or out-of-tolerance parts, frequently with nickel-base alloys. Bronze alloys may be used for some bearings and seal areas. Blends of tungsten carbide and nickel-base alloys work well for wear resistance. Zinc is commonly sprayed for corrosion resistance on bridges and other structures. Source: R.C. Tucker, Jr., Thermal Spray Coatings, Surface Engineering, Vol 5, ASM Handbook, ASM International, 1994, p 498. Information and data acquired from ASM International Thermal Spray Society website at http://asmcommunity.asminternational.org/portal/site/tss/SprayTips/ 15 Back to TOC Back to Overview
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