BS EN ISO 21068-3:2008
$189.07
Chemical analysis of silicon-carbide-containing raw materials and refractory products – Determination of nitrogen, oxygen and metallic and oxidic constituents
| Published By | Publication Date | Number of Pages |
| BSI | 2008 | 46 |
This part of ISO 21068 specifies methods for the determination of total nitrogen and nitrogen calculated as silicon nitride, total oxygen, and free metallic and oxidic components in silicon carbide raw materials and refractory products.
It applies only to silicon carbide materials that are not bonded with nitrogen. Nitride-bonded silicon carbide refractories are covered in EN 12698-1.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 9 | Scope Normative references |
| 10 | Terms and definitions Determination of nitrogen and oxygen General Combined determination of nitrogen and oxygen by an analyser Principle |
| 11 | Reagents Apparatus Calibration Procedure General |
| 12 | Determination Blank determinations Calculation Determination of nitrogen calculated as Si3N4 General |
| 13 | Acid decomposition — Titration method Principle Reagents |
| 14 | Apparatus |
| 16 | Mass of test portion Procedure |
| 17 | Measurement of recovery rate Calculation Acid decomposition — Photometry method Principle |
| 18 | Reagents |
| 19 | Apparatus Mass of test portion Procedure |
| 20 | Blank test Plotting of calibration graph Calculation Inert-gas fusion — Thermal conductivity method Principle Reagents |
| 21 | Apparatus |
| 23 | Mass of test portion Procedure |
| 24 | Blank test Calculation of calibration coefficient Calculation |
| 25 | Determination of total nitrogen Determination of total nitrogen by fusion decomposition Determination of total nitrogen by Kjeldahl distillation Determination of total nitrogen by microwave digestion Determination of free Iron by Inductively Coupled Plasma Ato General |
| 26 | Copper sulfate method Principle Reagents Apparatus |
| 27 | Instrument conditions Procedure Calculation Bromine/methanol method Principle |
| 28 | Reagents Apparatus |
| 29 | Instrument conditions Procedure Calculation |
| 30 | Determination of free aluminium and free magnesium General Acid decomposition — Inductively coupled plasma atomic emiss Principle Reagents |
| 31 | Apparatus Mass of test portion Procedure Blank test Plotting of calibration graph |
| 32 | Calculation Acid decomposition — Flame Atomic Absorption Spectrometry (F Principle Reagents Apparatus Procedure |
| 33 | Blank test Plotting of calibration graph Calculation Hydrogen generating method |
| 34 | Analysis of oxides General Wet methods Flame atomic absorption and/or inductively coupled plasma at General Sodium carbonate boric acid fusion method |
| 35 | Lithium metaborate fusion method XRF fusion method after ignition of the sample General Loss on ignition |
| 36 | Fusion Blanks and slope factors |
| 37 | Determination of silicon(IV) oxide, aluminium oxide, iron(II General Measurement of ratio on heat residue at 850 °C Methods of determination of each component |
| 38 | Determination of oxide components Calculation |
| 39 | Expression of results Test report |
