Determination of Mass Fraction of C, N, and O in Silicon Nitride Powder ASTM C1494

Determination of Mass Fraction of C, N, and O in Silicon Nitride Powder ASTM C1494

Two test methods appear in ASTM C1494. These test methods determine mass fraction % of Carbon (C), Nitrogen (N), and Oxygen (O) in silicon nitride powder having chemical compositions within limits.


    The ASTM C1494 test method is valid for the chemical analysis of a mass fraction of carbon, nitrogen, and oxygen in silicon nitride powder. These standard methods are used in the research, development, acceptance, production, and quality control of silicon nitride powders, which are utilized to produce ceramic components having silicon nitride content.                                                                                                                                                                                                                                                                         

    Test Procedure:

    The ASTM 1494 standard has two test methods.

    Test MethodsSections
    Total Carbon in Silicon Nitride Powder by Direct Combustion – Infrared Detection Method
    7.1 to 7.9
    Nitrogen in Silicon Nitride Powder by Direct Inert Gas Fusion-Thermal Conductivity Method and Oxygen by the Inert Gas Fusion-Infrared Measurement Method
    8.1 to 8.9

    Specimen Size : 

    ElementMass Fraction % Range
    Carbon0.05 to 5.0
    Nitrogen30 to 45
    Oxygen0.1 to 1.5


    Calibration constant is as follow,

    K= G ×P/100/AC -Ab

     K is the calibration constant, G is the mass of the calibration sample (g), P is the total carbon content (% of mass), Ac is the integral value of the calibration sample, and Ab is the integral value of the blank.


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