POLYCRYSTALLINE CORUNDUM FIBRES AND METHOD OF OBTAINING SAID FIBRES Russian patent published in 2012 - IPC C04B35/622 C04B35/111 D01F9/08 

FIELD: chemistry.

SUBSTANCE: invention relates to fibres from polycrystalline corundum, essentially consisting of corundum and an oxide of elements of the main subgroups of groups I and II, which can be used in producing fabric and composite materials. The fibres are produced using a method which involves adding nucleating seeds and a precursor of an oxide of elements of the main subgroups of groups I and II to aluminium chlorohydrate, adding a water-soluble polymer, subsequent spinning of fibres from said mixture and annealing said fibres at temperature 1100°C or higher. The nucleating seeds used are ultra-finely dispersed diaspore, haematite or corundum, which are added to the spinning solution in amount of 0.1-10 wt %. The oxides of elements of main subgroups of groups I and II are in the fibres in amount of 0.01-0.5 wt %. Crystallites of said corundum fibres are characterised by the following grain-size distribution: from 0 to 0.06 mcm (34%), from 0.06 to 0.122 mcm (55%) and from 0.122 to 0.3 mcm (11%).

EFFECT: fibres have improved mechanical properties.

4 cl, 1 ex