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Standard Test Method for Thermal Conductivity of Solids by Means of the Guarded-Comparative-Longitudinal Heat Flow Technique
Automatische name übersetzung:
Standard Test Method for Wärmeleitfähigkeit von Feststoffen mit Hilfe der Bewachter - Vergleichs - Longitudinal Wärmefluss -Technik
NORM herausgegeben am 15.3.2009
Bezeichnung normen: ASTM E1225-09
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 15.3.2009
SKU: NS-40925
Zahl der Seiten: 9
Gewicht ca.: 27 g (0.06 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
Copper alloy, Glass, Graphite, Guarded heat flow technique, Heat flow, Heating tests--chemicals/materials, Insulation, Iron, Longitudinal profile, Metals and metallic materials, Meter bar materials, Polymers, Refractories (general), Sensors, Silica content, Solid phase materials, Thermal conductance/conductivity, Thermal insulating materials, Thermal transmission properties, Tungsten, Alloys, Austenitic steel, Carbon, Ceramic materials/applications, Comparison techniques, Copper
Significance and Use | ||
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. |
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1. Scope | ||
1.1 This test method describes a steady state technique for the determination of the thermal conductivity, λ, of homogeneous-opaque solids (see Notes 1 and 2). This test method is for materials with effective thermal conductivities in the approximate range 0.2 < λ < 200 W/(m·K) over the approximate temperature range between 90 and 1300 K. It can be used outside these ranges with decreased accuracy. Note 1—For
purposes of this technique, a system is homogeneous if the apparent
thermal conductivity of the specimen, λA, does
not vary with changes of thickness or cross-sectional area by more
than ±5 %. For composites or
heterogeneous systems consisting of slabs or plates bonded
together, the specimen should be more than 20 units wide and 20
units thick, respectively, where a unit is the thickness of the
thickest slab or plate, so that diameter or length changes of
one-half unit will affect the apparent λA by less
than ±5 %. For systems that are
non-opaque or partially transparent in the infrared, the combined
error due to inhomogeneity and photon transmission should be less
than ±5 %. Measurements on highly
transparent solids must be accompanied with infrared absorption
coefficient information, or the results must be reported as
apparent thermal conductivity, λA. Note 2—This test method may also be used to evaluate the contact thermal conductance/resistance of materials. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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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2. Referenced Documents | ||
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