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Abstract
The performance of an organic coating is highly dependent on its physical and mechanical properties and their variation with temperature. A variety of thermal mechancal methods may be used to define these properites. This paper demonstrates the importance on penetration/indentation methods in the characterization of organic coatings. The use of thermal mechanical analysis (TMA) and ICI microindentometer to establish softening ponts, degree of cure, elastic modulus, and indentation hardness and creep is described. Dynamic methods have tended to take over from penetration/indentation technqiues in recent years, but the latter still are the only ones that can be used on most field samples (for example, specimens cut from beer cans, car hoods, and washing machines, pieces of metal siding from buildings, chunks of outboard motor castings, and so forth). Typical measurments and their significance in problem solving and coatings evaluation are presented and discussed. The difficulties of dealing with thin films and multicoat systems are also addressed. The paper closes with a discussion of the interfacing of a TMA with a computer for better data collection and analysis.
The performance of an organic coating is highly dependent on its physical and mechanical properties and their variation with temperature. A variety of thermal mechancal methods may be used to define these properites. This paper demonstrates the importance on penetration/indentation methods in the characterization of organic coatings. The use of thermal mechanical analysis (TMA) and ICI microindentometer to establish softening ponts, degree of cure, elastic modulus, and indentation hardness and creep is described. Dynamic methods have tended to take over from penetration/indentation technqiues in recent years, but the latter still are the only ones that can be used on most field samples (for example, specimens cut from beer cans, car hoods, and washing machines, pieces of metal siding from buildings, chunks of outboard motor castings, and so forth). Typical measurments and their significance in problem solving and coatings evaluation are presented and discussed. The difficulties of dealing with thin films and multicoat systems are also addressed. The paper closes with a discussion of the interfacing of a TMA with a computer for better data collection and analysis.
Date
9/1991
9/1991
Author(s)
Clifford Schoff; Peter Kamarchik
Clifford Schoff; Peter Kamarchik
Page(s)
138
138
Keyword(s)
thermal mechanical analysis; TMA; penetration; indentation; organic coating; softening point; indentation creep; indentation hardness
thermal mechanical analysis; TMA; penetration; indentation; organic coating; softening point; indentation creep; indentation hardness