Repetition of a process of impregnating a metal fiber or ceramic fiber preform or porous ceramic with (3) a mixture of polysilazane-type polymers with a number average molecular weight of 200-3000 and a viscosity adjusted to 100 Pa.s or lower at the impregnation temperature, prepared by mixing (1) o
Repetition of a process of impregnating a metal fiber or ceramic fiber preform or porous ceramic with (3) a mixture of polysilazane-type polymers with a number average molecular weight of 200-3000 and a viscosity adjusted to 100 Pa.s or lower at the impregnation temperature, prepared by mixing (1) one or more types of polysilazane-type polymers with a number average molecular weight of 200-3000 and a viscosity of less than 1 Pa.s at the impregnation temperature with (2) one or more types of polysilazane-type polymers with a number average molecular weight of 200-100,000 and having a viscosity of 1 Pa.s or higher or solid at the impregnation temperature, which are selected from polysilazanes whose main repeating unit is -[(SiH2)n(NH)r]-(where n and r are 1, 2 or 3), and copolymers, modified polymers and crosslinked polymers based thereon, and performing crosslinking curing and then firing, is performed for its conversion into a ceramic. The above polysilazane may be, for example, an inorganic polysilazane, an inorganic polysiloxazane, a polyorgano(hydro)silazane, a modified polysilazane or a polymetallosilazane. By performing the CVD coating before or after said process of impregnation, curing and firing, delamination of the fibers may be minimized.
대표청구항▼
A method for producing ceramic products, characterized by comprising impregnating a metal fiber or ceramic fiber preform or porous ceramic with (3) a mixture of polysilazane polymers with a number average molecular weight of 200-3000 and a viscosity adjusted to 100 Pa.s or lower at the impregnation
A method for producing ceramic products, characterized by comprising impregnating a metal fiber or ceramic fiber preform or porous ceramic with (3) a mixture of polysilazane polymers with a number average molecular weight of 200-3000 and a viscosity adjusted to 100 Pa.s or lower at the impregnation temperature, said mixture of polymers being prepared by mixing (1) one or more polysilazane polymers with a number average molecular weight of 200-3000 and a viscosity of less than 1 Pa.s at the impregnation temperature with (2) one or more polysilazane polymers with a number average molecular weight of 200-100,000 and having a viscosity of 1Pa.s or higher or solid at the impregnation temperature, said polymers (1) and (2) being selected from A-P below, and performing crosslinking curing and then firing the mixture of polymers for its conversion into a ceramic: A) A polysilazane whose main repeating unit is -[(SiH2)n(NH)r]-(where n and r are 1, 2 or 3); B) A polysilazane whose main repeating units are -[(SiH2)n(NH)r]-and -[(SiH2)mO]-(where n, m and r are 1, 2 or 3); C) A polyorgano(hydro)silazane represented by the compositional formula (RSiHNH)x [(RSiH)1.5N]1-x (where each R independently represents an alkyl, alkenyl, cycloalkyl, aryl, alkylsilyl, alkylamino, alkylhydrazine or alkoxy group, and 0.41); D) A polysilazane whose main repeating units are -[(SiH2)n(NH)r]-and [(SiR′H)n(NR′)r]-(where R′may be the same or different and is a hydrogen atom or the same as R above, and n and r are 1, 2 or 3); E) A polysilazane whose main repeating units are -SiH(N2-and [(SiR′H)n(NR′)r]-(where R′may be the same or different and is a hydrogen atom or the same as R above, and n and r are 1, 2 or 3); F) A modified polysilazane obtained by reacting the polysilazane in A above with an alkylamine, alkylsilazane or alkylaminosilane represented by (R1)2NH [where each R1 is independently an alkyl group or (R2)3Si-(where each R2 is independently an alkyl group or hydrogen, provided that at least one is not hydrogen)]; G) A modified polysilazane obtained by reacting the polysilazane in A above with an alcohol, organic acid, ester, ketone, aidehyde, isocyanate, amide or mercaptan; H) A silazane high polymer obtained by further crosslinking and branching the polysilazane in A above, wherein the ratio of -SiH2 groups to -SiH3 groups per molecule is 2.5-8.4; I) A polymetallosilazane obtained by reacting a polysilazane whose main repeating unit is represented by -Si(R3)2NR3-(where each R3 is independently a hydrogen atom or the same as R above, provided that at least one R3 is hydrogen), with a metal alkoxide represented by M(OR4)m (where M is an element selected from the group consisting of elements from Groups IIA to VA and elements from Groups IIB to VB of the Periodic Table, each R4 independently represents a hydrogen atom, an alkyl group of 1-20 carbon atoms or an aryl group provided that at least one R4 is not a hydrogen atom, and m is the valency of M.); J) A polyborosilazane whose main repeating units are -[(SiH2)n(NH)r]-(where n and r are 1, 2 or 3) and -B(N2; K) A polyborosilazane whose main repeating unit is represented by -Si(R3)2NR3-(where R3 is the same as above), and which has a crosslinked bond [Figure] [Figure] (where each R5 is independently a hydrogen atom, halogen atom or a C1 to C20 alkyl, alkenyl, cycloalkyl, aryl, alkoxy, alkylamino, hydroxyl or amino group, R6 is a residue bonded to the nitrogen atom of a nitrogen atom-containing R5 group, and in the last chemical formula at least 2 of the total of 6 atoms consisting of 3 nitrogen atoms and 3 boron atoms are used for crosslinking, while R5 may be bonded to the remaining atoms); L) A polyphosphosilazane whose main repeating unit is represented by -Si(R3)2NR3-(where R3 is the same as above), and which has a crosslinked bond [Figure] [Figure] (where R5 is the same as described above, R6 is a residue bonded to the nitrogen atom of a nitrogen atom-containing R5 group, and in the last chemical formula at least 2 of the bonding sites are used for crosslinking, while R5 may be bonded to the remaining atoms); M) A thermosetting copolymer prepared by copolymerizing a polysilazane whose main repeating unit is -[(SiH2)n(NH)r]-(where n and r are 1, 2 or 3) with a thermoplastic silicon-containing polymer; N) A thermosetting copolymer prepared by copolymerizing the reaction product of a polysilazane whose main repeating unit is -[(SiH2)n(NH)r]-(where n and r are 1, 2 or 3) and a metal compound, with a thermoplastic silicon-containing polymer; O) A thermosetting copolymer prepared by copolymerizing the polyborosilazane described in I, J or K above with a thermoplastic silicon-containing polymer; P) A copolymer of any of the above mentioned polymers.
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