Method and device for producing straight ceramic fibres
First Claim
1. A process for producing straight ceramic fibers, comprising:
- a) mixing ceramic powder, aqueous amine oxide and cellulose to form a suspension;
b) concentrating the suspension from a), which while undergoing heating is mixed, sheared and transported while undergoing evaporative removal of water until a suspension of the ceramic powder in a formable solution of cellulose in aqueous amine oxide has formed;
c) pressing the suspension obtained as per b) through a shaping tool to form continuous filament fibers, winding up the continuous filament fibers to form strands and washing off the strands;
d) drying the strands obtained as per c) under a pre-tension and with defined overall shrinkage to form straight green fibers;
e) processing the dried green fibers under their own weight or under a defined tension by pyrolyzing and sintering to form straight ceramic fibers.
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Accused Products
Abstract
The invention relates to an installation and method for producing straight ceramic fibres. Said installation essentially comprises a mixing device for producing a suspension of ceramic powder, aqueous amine oxide and cellulose. The suspension production occurs batch-wise or continuously and can take place in one or several steps with the addition of all or individual components. Said installation also comprises a device for concentrating the produced suspension of ceramic powder, aqueous amine oxide and cellulose, whereby said device intensively mixes with heating, shears and transports the suspension with water evaporation, until a precisely determined amount of water evaporates and a suspension of ceramic powder is formed in a mouldable solution of the cellulose in aqueous amine oxide. Said concentrating device also comprises a device linked to the above mentioned device, whereby the mouldable ceramic cellulose solution suspension is processed into ceramic raw fibres in a rope shape. Said concentrating device permits straight ceramic raw fibres to be formed and can be integrated with an installation, in which the raw fibre bundles are pyrolyzed and sintered.
15 Citations
27 Claims
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1. A process for producing straight ceramic fibers, comprising:
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a) mixing ceramic powder, aqueous amine oxide and cellulose to form a suspension;
b) concentrating the suspension from a), which while undergoing heating is mixed, sheared and transported while undergoing evaporative removal of water until a suspension of the ceramic powder in a formable solution of cellulose in aqueous amine oxide has formed;
c) pressing the suspension obtained as per b) through a shaping tool to form continuous filament fibers, winding up the continuous filament fibers to form strands and washing off the strands;
d) drying the strands obtained as per c) under a pre-tension and with defined overall shrinkage to form straight green fibers;
e) processing the dried green fibers under their own weight or under a defined tension by pyrolyzing and sintering to form straight ceramic fibers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 26, 27)
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21. A device for producing straight ceramic fibers, comprising:
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a) a mixing device for producing a suspension of ceramic powder, aqueous amine oxide and cellulose;
b) a device for concentrating, in which the suspension produced in a) while undergoing heating is intensively mixed, sheared and transported while undergoing evaporative removal of water until a precisely defined amount of water has evaporated off and a suspension of ceramic powder in a formable solution of cellulose in aqueous amine oxide has formed, c) a device which is downstream to that mentioned under b) or can be connected to it and wherein the suspension of ceramic powder in a formable solution of the cellulose in aqueous amine oxide is pressed through a shaping tool to form continuous filament fibers, wound up to form strands and washed off, d) a drying device in which the strands obtained in c) are dried under a pre-tension and with defined overall shrinkage to form straight green fibers, and e) a pyrolysis and sintering means in which the dried green fibers are processed under their own weight or under a defined tension to form straight ceramic fibers. - View Dependent Claims (22, 23, 24, 25)
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Specification