CEN/TC 184/WG 2 - Methods of test for ceramic powders

This Part of EN 725 specifies one fusion and one acid dissolution method for the determination of elements of sodium, potassium, iron, silicon, calcium and magnesium present as impurities in alumina using atomic absorption spectroscopy (AAS) or inductively coupled plasma (ICP) spectroscopy. For each element present as impurities, the methods are applicable to the following ranges, calculated as oxides :
-   Sodium oxide:      20 ppm to 6000 ppm
-   Potassium oxide:      20 ppm to 100 ppm
-   Ferric oxide:      20 ppm to 300 ppm
-   Silica:         50 ppm to 2000 ppm
-   Calcium oxide:      20 ppm to 700 ppm
-   Magnesium oxide:                   5 ppm to 1000 ppm

This part of EN 725 specifies methods for the determination of the levels of silicon, aluminium, titanium, iron, calcium, magnesium, potassium, sodium, yttrium, hafnium, cerium and strontium using flame atomic absorption spectrometry (FAAS) and inductively coupled plasma atomic emission spectrometry (ICP - AES).  These methods are applicable to the concentration ranges given in clause 3, expressed as oxides.

This Part of EN 725 describes a method for determining the densification of ceramic powders on natural sintering, without the application of any external pressure. The method is applicable to pure oxides, mixtures of oxides and solid solutions. Inorganic sintering additives may be used where their presence is reported.

This European Standard specifies a method for the determination of oxygen contents of 2 % or less in aluminium nitride powder, by XRF analysis.

This part of EN 725 describes a method for the determination of impurities in barium titanate powders using inductively coupled plasma optical emission spectroscopy (ICP-OES).
The method is applicable only to stoichiometric barium titanate. The maximum concentrations measured for each impurity are as follows:
   Sr   4 mg/g (4 000 ppm)
   Ca   500 ug/g (500 ppm)
   K   200 ug/g (200 ppm)
   Na, Mg, Al, Fe, Nb   100 g/g (100 ppm)
The minimum concentration or detection limits are from 1 ug/g to 5 ug/g (1 ppm to 5 ppm).

This European Prestandard specifies a method for the routine qualitative and quantitative determination of the crystalline phases (monoclinic, tetragonal and cubic) present in zirconia powders using X-ray powder diffraction.

This European Prestandard specifies methods for the determination of calcium, magnesium, iron, and aluminium, using flame atomic absorption spectroscopy (FAAS), or inductively coupled plasma atomic emission spectroscopy (ICP-AES).
The methods are applicable to the concentration ranges given in clause 3.

This Part of EN 725 describes methods for the determination of the compaction behaviour of ungranulated or granulated ceramic powders, when subjected to uniaxial compressive loading in a rigid die, under specified conditions.

This European Standard specifies a method for the determination of the tapped bulk density of granulated or un-granulated ceramic powders.

This European Prestandard (ENV) specifies a method for the determination of the flowability behaviour of ceramic granules by means of a calibrated funnel.

This European Standard specifies a method for the determination of the un-tamped bulk density of granulated or un-granulated ceramic powders.

This part of EN 725 describes for the determination of the extent to which a ceramic powder is compacted, when subjected to uniaxial compressive loading in a confining die, under specified conditions

This part of EN 725 specifies methods for the determination of elements of sodium, potassium, iron, silicon, calcium and magnesium present as impurities in alumina using atomic absorption (AAS) or inductively coupled plasma (ICP) instruments. For each element present as impurities, the methods are applicable to the following ranges, calculated as oxides: Sodium oxide: 20 ppm to 6000 ppm;Potassium oxide: 20 ppm to 100 ppm; Ferric oxide: 20 ppm to 300 ppm; Silica: 50 ppm to 2000 ppm; Calcium oxide: 20 ppm to 700 ppm; Magnesium oxide: 5 ppm to 1000 ppm.

This part of EN 725 describes a method for the determination of the oxygen content of non-oxide powders used for technical ceramics, using a hot carrier gas thermal extraction method.

This part of EN 725 describes the preparation of suspensions and calibration of apparatus, prior to the measurement of particle size distribution of powders used for advanced technical ceramics. The preparation is appropriate for measurements either by the sedimentation method, with the detection of X-ray absorption, or the laser light scattering method.

Migrated from Progress Sheet (TC Comment) (2000-07-10): 2-Year ENQ ++ Realized dates for the ENV: REAL41 = 1992-12; REAL53 = 1992-12 (CC/970919)

Migrated from Progress Sheet (TC Comment) (2000-07-10): Information on ENV: ++ REAL41=199212, REAL53=199212.

This part of EN 725 describes a method for the determination of the tapped bulk density of ceramic powders.

This part of EN 725 describes a method for the determination of the untamped bulk density of ceramic powders.

This Standard describes a method for the determination of the specific surface area of powders used for technical ceramics, by a nitrogen absorption, single-point method. The method is limited to the measurement of surface areas of over 1 m2/g.

This standard describes a method for the determination of the absolute density, by liquid pyknometry, of powders for use as raw materials in the preparation of advanced technical ceramics.