Inorganic fibre compositions
AssigneeMorgan Advanced Materials PLC
InventorsRonald Wainwright, Gary Jubb, Fontaine Fadiora
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Abstract
Inorganic fibers having the composition: 10≤Al2O3≤50 mol %; 2≤K2O≤40 mol %; 30≤SiO2≤70 mol %; and in which SiO2+Al2O3+K2O>=80 mol % can be protected against surface crystallization of kalsilite by: including an amount of a nucleation promoting component effective to promote bulk crystallization in the glass; and/or providing on at least part of their surface, potassium scavenging materials.
Claims42
Inorganic fibres formed as a glass having a composition comprising:—
- 10≤Al2O3≤50 mol %;
- 12≤K2O≤40 mol %;
- 30≤SiO2≤70 mol %;
- and
- an amount of a nucleation promoting component effective to promote bulk crystallisation in the glass;
- in which SiO2+Al2O3+K2O ≥80 mol % and with the total constituents not exceeding 100 mol %.
Inorganic fibres having a composition in weight percent:—
- Al2O3 36±1.5 wt %
- K2O 25.5±1.5 wt %
- SiO2 31±1.5 wt %
- ZrO2 6.5±0.5 wt %
- MgO 1±0.2 wt %
- with the total of these components being 99%-100% by weight.
Inorganic fibres formed as a glass having a composition comprising:—
- 10≤Al2O3≤50 mol %;
- 12≤K2O≤40 mol %;
- 30≤SiO2≤70 mol %;
- an amount of a nucleation promoting component effective to promote bulk crystallisation in the glass;
- the fibres bearing on at least part of their surface one or more potassium scavenging materials.
Inorganic fibres formed as a glass having a composition comprising:—
- 25≤Al2O3≤31 mol %;
- 20≤K2O≤24 mol %;
- 40≤SiO2≤45 mol %;
- 3.5 mol %≤ZrO2≤7 mol %;
- 1≤MgO ≤3 mol %
- in which SiO2+Al2O3+K2O≥80 mol % and with the total constituents not exceeding 100 mol %.
Dependencies are inferred from the claim text.