Chapter 37-High-Temperature Gases
Pages: 14 Published: Jan 2005
LABORATORY AND FIELD TESTING is aimed at characterizing material performance for specific applications, or at evaluating the effect of variations in test conditions on candidate materials. The test environment should mimic, as faithfully as possible, the environment of the actual application. This includes simulating the chemical composition of the atmosphere, temperature and thermal cycle profiles, stress states, fatigue conditions, and design. Test racks placed in actual use are frequently employed. In other cases, prototype or scaled-downed apparatus are designed and constructed to duplicate the end-use application. Laboratory service tests are commonly engineered specifically to evaluate the effect of one or more critical aspects of the exposure conditions. The data on material performance are then used to determine failure of mechanisms, components, or material life, or to screen materials for the application. This chapter will focus on high-temperature gaseous environment testing used to evaluate materials where the applications simultaneously involve high temperature and corrosive conditions. Common basic principles will be described that an investigator must consider in conducting and evaluating these tests. Generalized testing methods associated with specimen preparation, environment synthesis, and evaluation are briefly reviewed. Where applicable, reference is made to more detailed information and studies that are found in the technical literature.
Paper ID: MNL11043M
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