ASTM C1494 Determination of Mass Fraction of Carbon, Nitrogen, and Oxygen in Silicon Nitride Powder

ASTM C1494 Determination of Mass Fraction of Carbon, Nitrogen, and Oxygen in Silicon Nitride Powder

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

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    Scope:

    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 C1494 standard has two test methods.

    1. Total Carbon in Silicon Nitride Powder by Direct Combustion – Infrared Detection Method.
    2. Nitrogen in Silicon Nitride Powder by Direct Inert Gas Fusion-Thermal Conductivity Method and Oxygen by the Inert Gas Fusion-Infrared Measurement Method.

    Specimen Size : 

    In ASTM C1494 test method, the mass fraction % of carbon, nitrogen, and oxygen is determined for silicon nitride powder having chemical a composition within the following limits:

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

    Data:

    For ASTM C1494 testing, the calibration constant is as follows,

     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.

    Conclusion:

    The ASTM C1494 test method is valid for the chemical analysis of a mass fraction of carbon, nitrogen, and oxygen in silicon nitride powder.

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