Standard Test Method for Dynamic Testing of Powders Using the Freeman Technology FT4 Powder Rheometer

Importancia y uso:

5.1 The test can be used to evaluate the following:

5.1.1 Classification or comparison of powders—There are several parameters that can be used to classify powders relative to each other: AE_v, AR_v, BFE, CBD, CE, CI, FRI, NAS, PD_v, SE and SI.

5.1.2 Sensitivity analysis—Dynamic tests can be used to evaluate the relative effects of a range of powder properties or environmental parameters, or both, such as (but not limited to) humidity, particle size and size distribution, particle shape and shape distribution, moisture content and temperature.

5.2 Quality control—The test can, in some circumstances, be used to assess the flow properties of a feedstock, intermediate or product against pre-determined acceptance criteria.

5.3 Process design and operation—The determined parameters can be used to quantify powder behavior in numerous processing environments. The determined parameters may also be used to quantify the effect of changing process parameters on powder flowability, including (but not limited to) shear rate during mixing, water addition during granulation and temperature during drying.

Note 1: The quality of the result produced by this test method is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this test method are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors. Additional guidance on sampling of powders is given in Reference (1).

Practice D3740 was developed for agencies engaged in the testing and/or inspection of soil and rock. As such it is not totally applicable to agencies performing this test method. However, users of this test method should recognize that the framework of Practice D3740 is appropriate for evaluating the quality of an agency performing this practice. Currently there is no known qualifying national authority that inspects agencies that perform this test method.

Subcomité:

D18.24

Volúmen:

04.09

Palabras clave:

aerated energy; aeration ratio; basic flowability energy; conditioned bulk density; consolidated energy; consolidation index; dynamic testing; flow rate index; Freeman Technology; FT4 powder rheometer; normalized aeration sensitivity; powder; pressure drop; specific energy; stability index;