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• W2896620610 abstract "Hole drilling is an area where Nd: YAG lasers are used extensively. The laser is capable of producing good quality, high aspect ratio holes, in a variety of materials, at very high speeds. The benefits of laser hole drilling have made it attractive to both the aerospace and power generation industries where they have been widely adopted in the production of jet engine and gas turbine components. Probably the most common application of laser drilling is the production of small holes 0.3-0.8 mm diameter. in critically heated parts such as nozzle guide vanes, blades and combustor liners. Many thousands of holes are introduced in the surface of these components to allow a film of cooling air to flow over the component. Film cooling both extends the life of the component and enables extra performance to be achieved from the engine. In the past, the production of these holes was achieved using Electro Discharge Machining (EDM). Although EDM is capable of producing good quality holes, it is substantially slower than the laser and is not suited to production of holes at high or variable incidence angles where multi- wire heads cannot be used. It also requires relatively complex consumables tooling and electrolyte fluids, both of which contribute adversely to the cost of hole production.The advantages of being able to drill difficult materials, especially superalloys and ceramics are exploited in the laser drilling of cooling holes in the thermal barrier coated superalloys. Plasma sprayed thermal barrier coating (TBCs) consist of partially stablilised zirconia topcoat and a NiCrAly bond coat, deposited on a Ni-superalloy substrate. Laser drilling was performed using a JK704 pulsed high peak power (20kW) driller. Holes were drilled with various laser and processing parameters from metallic substrate and from the ceramic top coat.Hole drilling is an area where Nd: YAG lasers are used extensively. The laser is capable of producing good quality, high aspect ratio holes, in a variety of materials, at very high speeds. The benefits of laser hole drilling have made it attractive to both the aerospace and power generation industries where they have been widely adopted in the production of jet engine and gas turbine components. Probably the most common application of laser drilling is the production of small holes 0.3-0.8 mm diameter. in critically heated parts such as nozzle guide vanes, blades and combustor liners. Many thousands of holes are introduced in the surface of these components to allow a film of cooling air to flow over the component. Film cooling both extends the life of the component and enables extra performance to be achieved from the engine. In the past, the production of these holes was achieved using Electro Discharge Machining (EDM). Although EDM is capable of producing good quality holes, it is substantially slower ..." @default.
• W2896620610 created "2018-10-26" @default.
• W2896620610 creator A5061607402 @default.
• W2896620610 date "2004-01-01" @default.
• W2896620610 modified "2023-09-24" @default.
• W2896620610 title "Laser drilling of TBC superalloy" @default.
• W2896620610 doi "https://doi.org/10.2351/1.5060220" @default.
• W2896620610 hasPublicationYear "2004" @default.
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