Inorganic fibre compositions
AssigneeMorgan Advanced Materials PLC
InventorsRonald Wainwright, Gary Jubb, Fontaine Fadiora
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Abstract
Inorganic fibres 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 crystallisation of kalsilite by: including an amount of a nucleation promoting component effective to promote bulk crystallisation in the glass; and/or providing on at least part of their surface, potassium scavenging materials.
Claims43
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 formed as a glass having a composition comprising:
- 10≦Al2O3≦50 mol %;
- 12≦K2O≦40 mol %;
- 30≦SiO2≦70 mol %;
- the fibres bearing on at least part of their surface one or more potassium scavenging materials.
A method of making potassium aluminosilicate glass fibres from a melt, characterised in that the melt is of a composition such that on devitrification the glass undergoes bulk crystallisation.
A method as claimed in claim 30, in which the potassium aluminosilicate glass fibres are fibres as claimed in claim 1.
A method of protecting potassium aluminosilicate glass fibres from surface crystallisation of kalsilite, comprising providing on at least part of their surface one or more potassium scavenging materials.
Dependencies are inferred from the claim text.