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Metallographic Preparation of Thermal Spray Coatings: Coating Sensitivity and the Effect of Polishing Intangibles
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From IMR Test Labs
The heterogeneous or composite nature of the thermal spray deposit can make choosing a metallographic preparation process very difficult. Hard vs. soft phases, brittle ceramics, and mixtures of many phases can create a variety of issues. When a procedure is developed, it becomes a necessity to document all the parameters or intangibles that define the process. Examples of procedure definition will be discussed and a suggested list of critical intangibles such as polishing abrasives (concentration vs. frequency of application), lubricant (pH, type), and many other factors will be highlighted. Products & Services
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Topics of Interest
The metallographic process for evaluating thermally sprayed coatings is sometimes viewed as a variable process in the scope of coating evaluation. There is always a question as to whether the failure...
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Examination of material cross sections often provides essential information about the crystal structure, layer or film thicknesses, existence of voids or cracks, and other properties that might impact...
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The characterization of a thermal barrier coating (TBC) using routine metallographic methods has has investigators uncertain as to the authenticity of the microstructure concerning porosity, cracking...
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In Essen at the ITSC2002, the initial results of the EACMT (European Airline Committee for Materials & Technology) Sub-Committee on Standardization in Quality Control of Thermal Spray Coatings for the...
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Vickers and Knoop hardness testers can be used for Micro and Macro hardness testing. Typically loads are very light, ranging from a few grams to one or several kilograms, although "Macro" Vickers...
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