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BS EN ISO 21068-2:2024

BS EN ISO 21068-2:2024

$189.07

Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon – Determination of volatile components, total carbon, free carbon, silicon carbide, total and free silicon, free and surface silica

Published By Publication Date Number of Pages
BSI 2024 48
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This document specifies analytical techniques for the determination of volatile components by thermal treatment at specified temperatures, and methods for the determination of the total carbon, free carbon, silicon carbide, total and free silicon and free and surface silica content of silicon-carbide, silicon-nitride and silicon-oxynitride containing raw materials and refractory products.

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PDF Pages PDF Title
2 undefined
11 4.1 General
12 4.2 Determination of the loss on drying at 250 °C (wLOD250)
4.2.1 Principle
4.2.2 Apparatus
4.2.3 Procedure
4.2.4 Calculation
4.3 Determination of the loss on ignition in argon (wLOIAr)
4.3.1 Principle
13 4.3.2 Apparatus
4.3.3 Test assembly
4.3.4 Reagents
14 4.3.5 Procedure
4.3.6 Calculation
15 5.1 Scope
5.2 Combustion techniques
5.2.1 Combustion in a resistance furnace with lead borate or tin as decomposing agent
16 5.2.2 Combustion in an induction furnace (IF) with metallic powder as decomposing agent
17 5.3 Detection techniques
5.3.1 Coulometry
5.3.2 Detection of the released carbon dioxide, CO2, by infrared absorption (IR)
18 5.3.3 Thermal conductivity (TC) method
5.4 Expression of results
6.1 General
6.1.1 Direct methods
23 6.1.2 Indirect methods
26 7.1 General
7.2 Determination of silicon carbide, SiC, by indirect method
7.2.1 Principle
7.2.2 Calculation
27 7.2.3 Precision
7.3 Determination of silicon carbide, SiC, by combustion methods
7.3.1 Procedure
7.3.2 Calculation
7.4 Determination of silicon carbide, SiC, by combustion at 750 °C
7.4.1 Principle
7.4.2 Residue production
28 7.4.3 Determination of the total carbon content of the residue
7.4.4 Calculation
29 9.1 Principle
9.2 Pretreatment with hydrochloric acid
9.3 Determination of free silicon by hydrogen evolution
9.3.1 Reagents
30 9.3.2 Apparatus
9.3.3 Mass of test portion
31 9.3.4 Procedure
32 9.3.5 Blank test
9.3.6 Calculation
33 10.1 Principle
10.2 Reagents
10.3 Apparatus
34 10.4 Sample preparation
10.5 Procedure
35 10.5.1 Determination
10.5.2 Calculation and expression of SiO2 content

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BS EN ISO 21068-2:2024
$189.07