초록 ▼

Refractory fibres are disclosed for which a vacuum cast preform of the fibre has a shrinkage of 3.5% or less when exposed to 1260.degree. C. for 24 hours. The fibres comprise CaO, SiO.sub.2, SrO, and optionally ZrO.sub.2 any incidental impurities amounting to less than 2 mol % in total. To achieve t

Refractory fibres are disclosed for which a vacuum cast preform of the fibre has a shrinkage of 3.5% or less when exposed to 1260.degree. C. for 24 hours. The fibres comprise CaO, SiO.sub.2, SrO, and optionally ZrO.sub.2 any incidental impurities amounting to less than 2 mol % in total. To achieve the shrinkage performance stated the SiO.sub.2 excess (defined as the amount of SiO.sub.2 calculated as remaining after the above named constituents are crystallised as silicates) exceeds 26 mol %. Preferred fibres comprise:--CaO less than 33.8 mol %, SiO.sub.2 more than 62.1 mol %, and more preferably comprise:--CaO 12.9 to 31.9 mol %, SrO 2.6 to 15.5 mol %, SiO.sub.2 63.2 to 71.3 mol %, ZrO.sub.2 0 to 5.4 mol %.

대표청구항 ▼

[ What is claimed is:] [1.] A strontium containing refractory fibre for which a vacuum cast preform of the fiber has a shrinkage of 3.5% or less when exposed to 1260.degree. C. for 24 hours and consisting essentially of CaO, SiO.sub.2, SrO, and optionally ZrO.sub.2, and wherein any incidental impuri

[ What is claimed is:] [1.] A strontium containing refractory fibre for which a vacuum cast preform of the fiber has a shrinkage of 3.5% or less when exposed to 1260.degree. C. for 24 hours and consisting essentially of CaO, SiO.sub.2, SrO, and optionally ZrO.sub.2, and wherein any incidental impurities comprising MgO, iron oxides, and alkali metal oxides amount to less than 2 mol % in total, and in which excess SiO.sub.2, defined as the amount of SiO.sub.2 calculated as remaining after the above named constituents are crystallized as silicates, exceeds 26 mol %.