Jun,11

ISO 21814:2019 pdf – Fine ceramics (advanced ceramics, advanced technical ceramics) — Methods for chemical analysis of aluminium nitride powders

ISO 21814:2019 pdf – Fine ceramics (advanced ceramics, advanced technical ceramics) — Methods for chemical analysis of aluminium nitride powders

ISO 21814:2019 pdf – Fine ceramics (advanced ceramics, advanced technical ceramics) — Methods for chemical analysis of aluminium nitride powders.
1 Scope This document specifies methods for the chemical analysis of fine aluminium nitride powders used as the raw material for fine ceramics. This document stipulates the determination methods of the aluminium, total nitrogen, boron, calcium, copper, iron, magnesium, manganese, molybdenum, nickel, potassium, silicon, sodium, titanium, tungsten, vanadium, zinc, zirconium, carbon, chlorine, fluorine, and oxygen contents in aluminium nitride powders. The aluminium content is determined by using either an acid pressure decomposition- CyDTA-zinc back titration method or an acid digestion-inductively coupled plasma-optical emission spectrometry (ICP-OES) method. The total nitrogen content is determined by using an acid pressure decomposition-distillation separation-acidimetric titration method, a direct decomposition-distillation separation-acidimetric titration method, or an inert gas fusion-thermal conductivity method. The boron, calcium, copper, iron, magnesium, manganese, molybdenum, nickel, potassium, silicon, sodium, titanium, tungsten, vanadium and zinc contents are determined by using an acid digestion- ICP-OES method or an acid pressure decomposition-ICP-OES method. The sodium and potassium contents are determined via an acid pressure decomposition-flame emission method or an acid pressure decomposition-atomic absorption spectrometry method. The oxygen content is determined by using an inert gas fusion-IR absorption spectrometry method, while that of carbon is determined via a combustion-IR absorption spectrometry method or a combustion-conductometry method. The chlorine and fluorine contents are determined by using a pyrohydrolysation method followed by ion chromatography or spectrophotometry. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document
3? Terms? and? definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https: //www .iso .org/obp — IEC Electropedia: available at http: //www .electropedia .org/ 4 Analytes and ranges a) Aluminium (Al), range of 40 % to 70 % (mass fraction). b) Total nitrogen (T.N), range of 20 % to 40 % (mass fraction). c) Boron (B), range of 0,001 % to 0,03 % (mass fraction). d) Calcium (Ca), range of 0,001 % to 0,03 % (mass fraction). e) Copper (Cu), range of 0,001 % to 0,03 % (mass fraction). f) Iron (Fe), range of 0,001 % to 0,03 % (mass fraction). g) Magnesium (Mg), range of 0,001 % to 0,03 % (mass fraction). h) Manganese (Mn), range of 0,001 % to 0,03 % (mass fraction). i) Molybdenum (Mo), range of 0,001 % to 0,03 % (mass fraction). j) Nickel (Ni), range of 0,001 % to 0,03 % (mass fraction). k) Potassium (K), range of 0,001 % to 0,03 % (mass fraction). l) Silicon (Si), range of 0,001 % to 0,03 % (mass fraction). m) Sodium (Na), range of 0,001 % to 0,03 % (mass fraction). n) Titanium (Ti), range of 0,001% to 0,03 % (mass fraction). o) Tungsten (W), range of 0,001 % to 0,03 % (mass fraction). p) Vanadium (V), range of 0,001 % to 0,03 % (mass fraction). q) Zinc (Zn), range of 0,001 % to 0,03 % (mass fraction). r) Carbon (C), range of 0,01 % to 6 % (mass fraction). s) Chlorine (Cl), range of 0,001 % to 0,5 % (mass fraction). t) Fluorine (F), range of 0,001 % to 0,2 % (mass fraction). u) Oxygen (O), range of 0,05 % to 5 % (mass fraction). 5 Preparation of the test sample 5.1 General The sample preparation method shall be in accordance with ISO 8656-1, unless otherwise mutually agreed upon by the analyser and customer.
5.2 Sampling The sample shall be collected in accordance with ISO 8656-1. 5.3 Drying Place 10 g sample into a flat-type weighing bottle (60 mm × 30 mm) and spread it uniformly over the bottom of the bottle. Place the bottle in an air bath at 110 °C ± 5 °C for 2 h, uncovered, and cool in a desiccator (desiccant: magnesium perchlorate), covered, for 1 h. 5.4 Weighing Weigh the sample to the nearest 0,1 mg of the required quantity using a balance. 6 Reporting the analytical values 6.1 Number of analyses Analyse the sample twice on different days. 6.2 Blank test Upon analysis, perform a blank test to correct the measured values. 6.3 Evaluation of the analytical values When the difference between the two analytical values does not exceed the tolerance value (Table 1), the average value shall be reported. When the difference between the two analytical values exceeds the tolerance value, perform two additional analyses. When the difference of these further two analyses does not exceed the tolerance value, the average value thereof shall be reported. If the difference also exceeds the tolerance value, the median of four analytical values shall be reported. 6.4 Expression of the analytical values The analytical values shall be presented in % (mass fraction), in dryness. a) Aluminium, total nitrogen, and oxygen: express the results in four figures to two decimal places. b) Others: express the results to three decimal places.

Download
The previous

ISO 21503:2022 pdf - Project, programme and portfolio management — Guidance on programme management

The next

ISO 21815-1:2022 pdf - Earth-moving machinery — Collision warning and avoidance — Part 1: General requirements

Related Standards