The comparative method of measurement of thermal conductivity is especially useful for engineering materials including ceramics, polymers, metals and alloys, refractories, carbons, and graphites including combinations and other composite forms of each.
Proper design of a guarded-longitudinal system is difficult and it is not practical in a method of this type to try to establish details of construction and procedures to cover all contingencies that might offer difficulties to a person without technical knowledge concerning theory of heat flow, temperature measurements, and general testing practices. Standardization of this test method is not intended to restrict in any way the future development by research workers of new or methods or improved procedures. However, new or improved techniques must be thoroughly tested. Requirements for qualifying an apparatus are outlined in Section 10.
1.1 This test method describes a steady state technique for the determination of the thermal conductivity, , of homogeneous-opaque solids (see Note 1 and Note 2). This test method is for materials with effective thermal conductivities in the approximate range 0.2 200 W/(mK) over the approximate temperature range between 90 and 1300 K. It can be used outside these ranges with decreased accuracy. Note 0For purposes of this technique, a system is homogeneous if the apparent thermal conductivity of the specimen,
This test method may also be used to evaluate the contact thermal conductance/resistance of materials.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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