DIN EN ISO 21068-1-2008 含碳化硅的原材料和耐火制品的化学分析.第1部分:一般信息和样品制备
Chemical analysis of silicon-carbide-containing raw materials and refractory products - Part 1: General information and sample preparation (ISO 21068-1:2008); English version of DIN EN ISO 21068-1:2008-12
This part of ISO 21068 gives definitions and specifies techniques for the preparation of samples for the
chemical analysis of silicon-carbide-containing raw materials and refractory products including:
a) graphite brick containing silicon carbide;
b) silicon carbide brick (includes the bricks containing silicon nitride);
c) refractories containing carbon and/or silicon carbide mixed with clay;
d) refractories containing carbon and/or silicon carbide mixed with silica (and fused silica);
e) refractories containing carbon and/or silicon carbide mixed with high alumina material;
f) refractories containing carbon and/or silicon carbide mixed with magnesia (and dolomite);
g) refractories containing carbon and/or silicon carbide mixed with chrome mineral or magnesia-chrome
materials;
h) refractories containing carbon and/or silicon carbide except those described in a) to g) above.
The items of chemical analysis described in ISO 21068, Parts 1 to 3 are as follows:
1) loss on drying (LOD);
2) loss on ignition (LOI);
3) total carbon, Ctotal;
4) free carbon, Cfree;
5) silicon carbide, SiC;
6) free silicon (Sifree);
7) free aluminium (Alfree);
8) free magnesium (Mgfree);
9) free iron (Fefree);
10) silicon(IV) oxide (SiO2);
11) aluminium oxide (AI203);
12) iron(Ill) oxide (total iron oxide calculated as Fe203);
13) titanium(IV) oxide (TiO2);
14) calcium oxide (CaO);
15) magnesium oxide (MgO);
16) sodium oxide (Na20);
17) potassium oxide (K20);
18) chromium(Ill) oxide (Cr203);
19) zirconium oxide (ZrO2);
20) boron oxide (total boron calculated as B203);
21) nitrogen;
22) oxygen;
23) nitrides (undifferentiated: Si3N4, AIN, BN, sialon, oxy-nitrides, etc.).