US20130071660A1 - Composition For Preparing Ceramic Fiber And A Biosoluble Ceramic Fiber Prepared Therefrom For Heat Insulating Material At High Temperature - Google Patents

Composition For Preparing Ceramic Fiber And A Biosoluble Ceramic Fiber Prepared Therefrom For Heat Insulating Material At High Temperature Download PDF

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US20130071660A1
US20130071660A1 US13/580,226 US201013580226A US2013071660A1 US 20130071660 A1 US20130071660 A1 US 20130071660A1 US 201013580226 A US201013580226 A US 201013580226A US 2013071660 A1 US2013071660 A1 US 2013071660A1
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ceramic fiber
composition
fiber
high temperature
temperature
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Jin Hyuk Lee
In Sig Seog
Jeung Je Lee
Won Sik Jung
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KCC Corp
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • C03C3/093—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium containing zinc or zirconium
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B1/78—Heat insulating elements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/62227—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining fibres
    • C04B35/62231—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining fibres based on oxide ceramics
    • C04B35/6224—Fibres based on silica
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C13/00—Fibre or filament compositions
    • C03C13/006—Glass-ceramics fibres
    • C03C13/007—Glass-ceramics fibres containing zirconium
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/443—Heat-resistant, fireproof or flame-retardant yarns or threads
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2213/00—Glass fibres or filaments
    • C03C2213/02—Biodegradable glass fibres
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3409—Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5264—Fibers characterised by the diameter of the fibers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/298—Physical dimension

Definitions

  • the present invention relates to a composition for preparing ceramic fiber and a biosoluble ceramic fiber prepared therefrom for heat insulating material at high temperature, more specifically, a composition for preparing ceramic fiber comprising SiO 2 as a network-forming oxide, CaO and MgO as modifier oxides, and ZrO 2 , Al 2 O 3 and B 2 O 3 as intermediate oxides with appropriate ratios, which improves the solubility of the ceramic fiber in artificial body fluid; shows good thermal/mechanical properties such as heat resistance, high-temperature viscosity, compressive strength and restoration when used at a high temperature of 1260° C.; and provides an economic effect that a ceramic fiber can be prepared easily by using the existing facilities, and a biosoluble ceramic fiber prepared therefrom for heat insulating material at high temperature.
  • ceramic fibers are used as a raw material of lagging materials, cold-insulating materials, heat-insulating materials, sound-proofing materials, sound-absorbing materials, filtering materials and the like because they have low thermal conductivity, and are thin and long in shape.
  • refractory heat-insulating material usually refers to a refractory fiber that can be used at a temperature higher than that of the conventional mineral wool.
  • fiber-phase blanket heat-insulating materials for the high temperature-application are classified as Type 1 (732° C.) to Type 5 (1649° C.).
  • the safe use temperature of fiber is ordinarily defined as a temperature having a thermal linear shrinkage of 3% or less (or 5% or less) when retaining the fiber at the relevant temperature for 24 hours.
  • the refractory heat-insulating material which is most generally used now is Al 2 O 3 —SiO 2 (RCF-AS)-based fibers, and the safe-use temperature thereof is in the range of 1100-1260° C.
  • the following literature can be exemplified as prior technologies regarding the Al 2 O 3 —SiO 2 (RCF-AS)-based fibers.
  • U.S. Pat. Nos. 2,873,197 and 4,555,492 disclose an Al 2 O 3 —SiO 2 (RCF-AS)-based fiber in which a certain amount of ZrO 2 component is added to Al 2 O 3 —SiO 2 -based composition, and said patents states that the safe-use temperature of the fibers disclosed therein has been increased to 1430° C.
  • U.S. Pat. No. 4,055,434 discloses a fiber composition in which at most 16% of burned dolomite, as a raw material of CaO and MgO, is added to Al 2 O 3 —SiO 2 -based composition, said fiber having a heat-resistant temperature of 760-1100° C.
  • 3,687,850 describes a silica fiber containing 76-90% of SiO 2 and 4-8% of Al 2 O 3 as prepared by adding an acid to a fiber composition consisting of SiO 2 , Al 2 O 3 , R 2 O (alkali metal oxide), RO (alkali-earth metal oxide) and B 2 O 3 , and then dissolving RO, R 2 O and B 2 O 3 therein, said silica fiber having a heat resistance of 1093° C. without the precipitation of any crystalline material.
  • the fiber compositions for the preparation of refractory heat-insulating material has been deduced in light of the heat resistance and the dissolving property to acids, however, they do not pertain to the dissolving property to a salts solution as an artificial body fluid. Furthermore, said fibers can result in a low-solubility problem in a physiological medium because their content of Al 2 O 3 exceeds 4%.
  • Bioabsorbable Fiber Glass Composition containing CaF 2 , ZnO, SrO, Na 2 O, K 2 O, Li 2 O, etc. in addition to CaO and P 2 O 5 [U.S. Pat. No. 4,604,097]; Fiber Composition in which P 2 O 5 and the like are added to a conventional soda-lime borosilicate [International Publication No. WO 92/0781]; and Fiber Composition which is formed by increasing the amount of P 2 O 5 in the soda-lime borosilicate and adding Na 2 O and the like thereto [U.S. Pat. No. 5,055,428].
  • compositions are limited in that it is impossible to use them as a biodegradable material at a high temperature of 1000° C. or higher because: the fibers produced therefrom have low heat resistance since the compositions contain a relatively large amount of R 2 O component; they are nothing but an architectural heat-insulating material applicable at a maximum temperature of 350° C. or less in light of having no description of its safe use temperature.
  • a blowing method in which the composition is fiberized by compressed air or compressed steam, and a spinning method in which the composition is fiberized by dropping melt material into a cylinder rotating at a high speed are well known in this technical field.
  • the ideal viscosity of the composition, which is suitable for fiberizing it according to the spinning method or the blowing method, should be low at a range of 20-100 poises, or be similar to that of the conventional SiO 2 —Al 2 O 3 -based composition without any great deviation.
  • the viscosity of the fiber is too high at the fiberizing temperature, the diameter thereof becomes larger at the same time the amount of the thick unfiberized shot is increased, whereas, if the viscosity of the fiber is too low, the fiber becomes shorter and thinner and the amount of fine unfiberized shot is increased.
  • the viscosity of the molten glass depends on the composition and temperature of the glass. In view of the above, it is necessary to design the optimal composition for retaining the optimal fiberizing viscosity; and the fiberizing composition having the high viscosity has to effectuate it at a higher temperature. Therefore, it is required to stay within a suitable range of viscosity in the vicinity of the fiberizing temperature.
  • the ceramic fiber which is used for the purpose of heat insulating at a high temperature is required to have high heat resistance as well as excellent endurance against repetitive thermal stress long dash for example, raw material of a furnace.
  • its use temperature is related to shrinkage at the relevant temperature. Shrinkage of the fiber article is influenced by a viscosity of the glassy fiber composition at a high temperature, a type or amount of the crystal forming and growing due to heat exposure during the life of the article, a crystal precipitation temperature and a viscosity of the glassy material remaining after the crystal is precipitated.
  • the high temperature-precipitating crystal has a specific gravity higher than that of the glassy fiber, the stress is caused by the precipitation and growth of the crystal at its interface, and the fiber can be cut or modified by the relulting stress, thereby shrinking it.
  • the fiber exists in a glassy phase without precipitating any crystal, the viscosity of such a fiber—for example, glass—is gradually lower at a relatively low temperature, and therefore, its shrinkage is increased.
  • the fiber comprised of a composition having low shrinkage at high temperature is required to have the precipitation amount, precipitation velocity and precipitation temperature suitable for precipitating crystal.
  • the variation of the solubility in artificial body fluid must be as small as possible. Therefore, it is important to choose a composition that has low-heat linear shrinkage at high temperature and is easier to melt and fiberize, as well as having high solubility in an artificial body fluid.
  • K dis In the test of biodegradability actually using an artificial body fluid, values of K dis have the maximum error of ⁇ 30%, and thus it can be called a biodegradable fiber when the fiber has K dis of at least 150 ng/cm 2 ⁇ hr, more preferably at least 200 ng/cm 2 ⁇ hr.
  • the present invention seeks to solve the problems of the prior arts as explained above. Therefore, the purpose of the present invention is to provide a novel ceramic fiber composition which maintains a high-silica region of SiO 2 content of 75 wt % or more in a CaO—MgO—ZrO 2 —SiO 2 -based composition system and shows a good fiberization yield, a low thermal conductivity, a low thermal linear shrinkage of 3% or less even at 1260° C. for 24 hours and an excellent biodegradability with a solubility constant in artificial body fluid of 200 ng/cm 2 ⁇ hr or higher.
  • the present invention provides a composition for preparing a biosoluble ceramic fiber for heat insulating material at high temperature, comprising 75-80 wt % of SiO 2 , 10-14 wt % of CaO, 4-9 wt % of MgO, 0.1-2 wt % of ZrO 2 , 0.5-1.5 wt % of Al 2 O 3 and 0.1-1.5 wt % of B 2 O 3 .
  • the sum of the amounts of CaO and Al 2 O 3 in the above composition for preparing a ceramic fiber is 11-15 wt %.
  • Another aspect of the present invention provides a biosoluble ceramic fiber for heat insulating material at high temperature which is prepared from the composition for preparing a ceramic fiber according to the present invention and satisfies one or more of the properties of 1) an unfiberized shot content of 50 wt % or less [e.g., from 0.01 or less to 50 wt %], 2) an average fiber diameter of 6 ⁇ m or less [e.g., from 2 to 6 ⁇ m], 3) a thermal linear shrinkage (1260° C./for 24 hours) of 3% or less [e.g., from 0.001 or less to 3%] and 4) a solubility constant in artificial body fluid of 200 ng/cm 2 ⁇ hr or more [e.g. from 200 to 1000 ng/cm 2 ⁇ hr or more].
  • the composition for preparing a ceramic fiber of the present invention decreases the content of Al 2 O 3 to a proper level and increases the contents of modifier oxides in a ceramic fiber composition system for heat insulating material at high temperature, thereby remarkably increasing the solubility of the ceramic fiber in artificial body fluid.
  • the lowering of heat resistance according to the decrease of Al 2 O 3 content is overcome by the addition of ZrO 2 , a eutectic region which can be generated amid the existence of three components of SiO 2 —Al 2 O 3 —CaO is suppressed by controlling the contents of CaO and Al 2 O 3 , and the decrease of biodegradability of the ceramic fiber according to the decrease of CaO content is suppressed by the addition of B 2 O 3 .
  • composition for preparing a biodegradable ceramic fiber according to the present invention is explained hereinafter in more detail, according to its constitutional components.
  • SiO 2 is a main component of ceramic fiber and is contained in an amount of 75-80 wt %, preferably 76-78 wt %, based on the total weight of the composition. If the content of SiO 2 is less than 75 wt %, the contents of CaO and MgO should relatively increase to improve the biodegradability, which results in the problems that the cost for raw material increases, the fiber length becomes too short and thus the stiffness increases, unfiberized shot content increases and thus the fiberization becomes difficult, and the thermal shrinkage increases and thus properties deteriorate.
  • CaO is a modifier oxide to increase the solubility of the produced fiber in body fluid and contained in an amount of 10-14 wt %, preferably 10-13.7 wt % and more preferably 12-13 wt %, based on the total weight of the composition. If the content of CaO is less than 10 wt %, the solubility of the fiber in body fluid decreases. In contrast, if the content of CaO exceeds 14 wt %, the amount of crystallite precipitated during fiber production increases and thus the SiO 2 content in the produced fiber relatively decreases, thereby causing problems in the thermal stability and the increase of thermal linear shrinkage at high temperature.
  • a eutectic point can be generated in a eutectic region and the melting may occur at about 1170° C. (see FIG. 1 ). If the composition part of such a eutectic region exists during the melting procedure of ceramic fiber, the required heat resistance cannot be satisfied and a lowering of heat resistance and heat retention caused by rapid fiber deterioration also occurs.
  • such problems of a eutectic region are solved by controlling the sum of the contents of CaO and Al 2 O 3 to 10.5-15.5 wt %, preferably 11-15 wt %.
  • MgO is another modifier oxide to improve the solubility of the produced fiber in body fluid and contained in an amount of 4-9 wt %, preferably 5-7 wt %, based on the total weight of the composition. If the content of MgO is less than 4 wt %, the biodegradability of the fiber in body fluid decreases or the effect of inhibiting the growth of fiber crystallite during fiber production decreases. In contrast, if the content of MgO exceeds 9 wt %, the eutectic point region becomes close to those of diopside and wollastonite and thus the fiberization viscosity increases and the fiber melting temperature becomes lower.
  • raw materials such as dolomite and limestone which are commercially available at relatively low costs may be used instead of a pure compound.
  • Al 2 O 3 is added as an intermediate oxide to perform the function of cutting the bonding structure of SiO 2 during the melting procedure at high temperature and to control the viscosity properly for preparing ceramic fiber.
  • Al 2 O 3 is contained in an amount of 0.5-1.5 wt %, preferably 0.7-1.2 wt %, based on the total weight of the composition. If the content of Al 2 O 3 is less than 0.5 wt %, the effect of controlling viscosity at high temperature becomes lower. In contrast, if the content of Al 2 O 3 exceeds 1.5 wt %, the solubility of the fiber in body fluid decreases and at the same time, the heat-resistant temperature becomes lower.
  • ZrO 2 is added to prevent the problems of lowering thermal stability at high temperature and chemical durability, which may be caused by the decrease of the content of Al 2 O 3 , and contained in an amount of 0.1-2 wt %, preferably 0.6-1.5 wt %, based on the total weight of the composition. If the content of ZrO 2 is less than 0.1 wt %, the thermal stability at high temperature and chemical durability become lower. In contrast, if the content of ZrO 2 exceeds 2 wt %, the solubility of fiber in body fluid decreases severely.
  • B 2 O 3 is an oxide forming a glass with a low melting point and added as a fiberization aid to further improve the solubility of the produced fiber in an artificial body fluid.
  • B 2 O 3 is contained in an amount of 0.1-1.5 wt %, preferably 0.7-1.3 wt %, based on the total weight of the composition. If the content of B 2 O 3 is less than 0.1 wt %, the solubility in an artificial body fluid becomes lower and accordingly the biodegradability in a body fluid decreases. In contrast, if the content of B 2 O 3 exceeds 1.5 wt %, the heat resistance becomes deteriorated upon long-term exposure to high temperature and thus the high-temperature shrinkage increases.
  • B 2 O 3 is preferably added in case of producing the fiber with an increased SiO 2 content for the following reason: In case of high content of SiO 2 , the viscosity of the composition becomes higher according to the increase of the SiO 2 content, thereby lowering the yield of the fiber.
  • the addition of B 2 O 3 can solve the problems of the lowering of fiber yield and the decrease of solubility in an artificial body fluid.
  • a side effect of fiber solubility decrease in body fluid at room temperature which may occur when the Al 2 O 3 content is increased to control the viscosity at high temperature, can be overcome by the proper use of B 2 O 3 .
  • the composition for preparing a ceramic fiber according to the present invention may contain impurities such as Na 2 O, K 2 O, TiO 2 and Fe 2 O 3 , depending on the raw materials used. However, if their content is maintained to a level of 1 wt % or less based on the total weight of the composition, the properties of the produced fiber are not deteriorated by the impurities.
  • a melting process of electrically charging type using three-phase electrodes may be employed to prepare the composition for preparing a ceramic fiber.
  • the materials of the electrode and the outlet may consist of molybdenum.
  • the methods for fiberizing the composition for preparing a fiber of the present invention there is no particular limitation to the methods for fiberizing the composition for preparing a fiber of the present invention.
  • a conventional fiberization method such as a blowing method or a spinning method may be employed.
  • the viscosity range required of the composition for preparing a fiber is preferably 20-100 poise.
  • Viscosity of a melt is a function of temperature and the corresponding composition ratio and thus that of a melt having the same composition ratio is dependent upon temperature. This affects the fiberization since if the temperature of a melt during the fiberization becomes higher, the viscosity decreases whereas if the fiberization temperature becomes lower, the viscosity increases.
  • the viscosity of the fiber composition at the fiberization temperature is too low, the produced fiber is too short and thin, and many fine unfiberized shots are generated, by which the fiberization yield becomes lower. If the viscosity is too high, fibers having a large diameter are formed and thick unfiberized shots are increased.
  • the ceramic fiber prepared from the composition for preparing a ceramic fiber of the present invention satisfies one or more of the properties, most preferably all of the properties of 1) an unfiberized shot content of 50 wt % or less, preferably 40 wt % or less, 2) an average fiber diameter of 2 to 6 ⁇ m, preferably 3 to 5 ⁇ m, 3) a thermal linear shrinkage (1260° C./for 24 hours) of 3% or less, preferably 2% or less, and 4) a solubility constant in an artificial body fluid of 200 ng/cm 2 ⁇ hr or more, preferably 300 ng/cm 2 ⁇ hr or more. Therefore, the ceramic fiber is particularly suitable for heat insulating material at high temperature and shows an excellent biosolubility. Furthermore, it can be produced easily by using conventional ceramic fiber production processes directly and thus provides an economical advantage.
  • a biosoluble ceramic fiber particularly suitable for heat insulating material at high temperature because it can decrease the harmfulness to the human body since it has a remarkably improved solubility in an artificial body fluid as compared with conventional ceramic fibers and thus is easily removable when inhaled into the lungs of a human, and it has an excellent stability at high temperature and excellent mechanical properties such that the thermal linear shrinkage at 1260° C. for 24 hours is less than 3% while overcoming the property deterioration at high temperature which is a problem of conventional biodegradable ceramic fibers.
  • FIG. 1 is a phase equilibrium diagram of the three-component system of SiO 2 — Al 2 O 3 —CaO.
  • compositions for ceramic fiber production were prepared with the ingredients and contents thereof as specified in Table 1 below by a melting process of electrically charging type using three-phase electrodes, and then ceramic fibers were produced from the compositions by a conventional process for producing RCF inorganic fibers.
  • Comparative Example 1 represented a composition for producing a conventional RCF
  • Comparative Examples 2, 4 and 5 represented compositions for testing
  • Comparative Example 3 was a composition for producing a product for 1,100 ⁇ .
  • the average fiber diameter, the unfiberized shot content and the production yield were calculated and determined, and the results are shown in Table 1 below.
  • W s represents the unfiberized shot content
  • W o represents the weight of initial particles
  • W 1 represents the weight of residue particles.
  • fibers In general, if fibers have a large average diameter and a coarse cross-section, they have problems of causing a tingling feel during handling as well as the reduction of the heat-insulating effect.
  • the fibers produced according to the examples of the present invention were of high quality because they had a smaller average diameter of 3.8-4.7 ⁇ m as compared with 6 ⁇ m, which is the average diameter of commercial ceramic fibers as usually produced. Furthermore, because of the smaller average fiber diameter, the fibers produced therefrom are expected to exert a better heat-insulating effect.
  • the unfiberized shot contents of the examples of the present invention were 24-32 wt %, which were remarkably reduced values as compared with 30-36 wt % of the comparative examples 1, 2, 4 and 5 of conventional ceramic fibers.
  • the examples of the present invention achieved production yields of 72-76%, which was equal to or better than those of the conventional ceramic fibers of 70-80%.
  • the comparative example 4 which was a composition having high fiberization viscosity, showed a production yield lower than that of the comparative example 1 and lower than those of the examples.
  • ceramic fibers having an unfiberized shot content of 50 wt % or less and a fiber average diameter of 6 ⁇ m or less can be produced by using the existing facilities.
  • l 0 represents the initial distance (mm) between marks on the test sample
  • 1 1 represents the length (mm) between marks on the test sample after heating.
  • ⁇ 1 represents a reference viscosity which is a theoretical viscosity of Al 2 O 3 —SiO 2 (RCF-AS)-based fiber composition of a conventional ceramic fiber product
  • ⁇ 2 represents a relative viscosity from which the viscosity of the examples and comparative examples were calculated, and the fiberization temperature was converted therefrom
  • d o means an initial average diameter of fiber ( ⁇ m)
  • ⁇ represents an initial density of fiber (g/cm 3 )
  • M 0 represents an initial mass of fiber (mg)
  • M represents a mass of residual fiber after dissolution (mg)
  • t represents time for test (hr).
  • a fiber to be tested was placed between thin layers of 0.2 ⁇ m polycarbonate membrane filters fixed with a plastic filter supporter, and an artificial body fluid was filtered through said filters to determine the dissolution rate.
  • the artificial body fluid was controlled to retain a temperature of 37° C. and a flow rate of 135 mL/day, and its pH was maintained at a range of 7.4 ⁇ 0.1 by using a gas of CO 2 /N 2 (5/95%).
  • the fiber was leached for 21 days and the filtered artificial body fluid was analyzed with Inductively Coupled Plasma Spectrometry (ICP) to measure the amount of ions dissolved therein at given timings (1 st , 4 th , 7 th , 11 th , 14 th and 21 st days). From the results, the solubility constants (K dis ) thereof were determined by using the above Equation 5.
  • ICP Inductively Coupled Plasma Spectrometry
  • the artificial body fluid (Gamble Solution) used for measuring the dissolution rate of the fiber had the contents of ingredients (g/L) as shown in Table 3 below:
  • the ceramic fibers of the examples 1-5 showed low thermal linear shrinkage less than 3.0% (1.3-1.9%) and even after the thermal treatment at the same temperature for 168 hours. Furthermore, even if heat-treating the fibers at the above temperature for 168 hours, they still showed low thermal linear shrinkage less than 3.0% (2.2-2.8%). On the contrary, the fibers of the comparative examples 2 to 5 showed rapid shrinkage. Furthermore, in the comparative examples 2, 3 and 5, the melting temperatures were reduced about 50-100° C. or more, as compared with those of the examples.
  • the fiberization temperature As shown in the comparative example 4, all of the examples 1 to 5 showed equal levels to 1835° C. of the comparative example 1 which was a conventional ceramic fiber. It is thought that these results were obtained because proper use of Al 2 O 3 induced the dissolution of SiO 2 network structure and thus the possible increase of viscosity due to the increase of SiO 2 content was prevented.
  • the fiberization temperature was increased as compared with the examples. In this case, to retain the same viscosity, the melting temperature should be increased considerably. If not, the production yield was reduced as shown in the comparative example 4.
  • the solubility constant as a reference for the biodegradability, all of the examples 1 to 5 showed a level of 300 ng/cm 2 ⁇ hr or more and thus are regarded as having excellent biodegradability. Also, the example 5 showed the highest solubility constant (480 ng/cm 2 ⁇ hr) because it contained a relatively large amount of B 2 O 3 which is well known to highly contribute to biodegradability. On the contrary, the comparative example 1 as a conventional RCF showed a very low solubility constant. In the comparative examples 2 and 5, it is thought that the relatively high level of Al 2 O 3 content of 1.6-1.9 wt % was a cause of the biodegradability reduction.
  • the ceramic fiber according to the present invention has excellent biodegradability in an artificial body fluid, excellent fiberization property and high productivity due to its high fiberization yield. Furthermore, the ceramic fiber according to the present invention is useful as a heat insulating material at high temperature because the variation of thermal linear shrinkage is small in spite of thermal treatment at 1260° C. for 24 hours.

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