Standard Test Method for Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent Porosity

Importancia y uso:

5.1 For PM materials containing less than two percent porosity, a density measurement may be used to determine if the part has been densified, either overall or in a critical region, to the degree required for the intended application. Density alone cannot be used for evaluating the degree of densification because chemical composition and heat treatment affect the pore-free density.

5.2 For cemented carbides, a density measurement is normally used to determine if there is any significant deviation in composition of the carbide grade. For straight tungsten carbide-cobalt grades, the relationship is straightforward. For complex carbide grades (for example, grades containing tantalum carbide or titanium carbide, or both, in addition to tungsten carbide-cobalt), the situation is more complicated. If the measured density is beyond the specified limits, the composition is outside of the specified limits. A measured density within the specified limits does not ensure correct composition; compensation between two or more constituents could result in the expected density with the wrong composition. Density alone cannot be used for evaluating a cemented carbide grade.

Subcomité:

B09.11

Referida por:

B0853-16R21E01, F3273-17R21E01, F3055-14AR21, F3056-14R21, B0777-15R20, A0988_A0988M-23, F2886-17R23, A0989_A0989M-23, F3184-16R23, F3055-14AR21, C1331-18R23, B0883-24, F2885-17R23, F3318-18, F2924-14R21, F3213-17, B0848_B0848M-21, B0988-18R22, B0832-93R23, B0844-98R21, F2924-14R21, F3302-18, F3056-14R21, B0962-23, F2989-21, F3607-22, F3637-23

Volúmen:

02.05

Número ICS:

77.160 (Powder metallurgy)

Palabras clave:

cemented carbides; density; hard metals; metal injection molded (MIM) parts; powder forged (PF) parts; powder metallurgy (PM); powder metallurgy;