Novel borosilane compounds useful for the production of ceramic fibers, ceramic coatings, molded articles, film and/or ceramic microstructures by injection molding or lithographic processes

摘要

New borosilane compounds (1) are claimed. New borosilane compounds of formula (1) are claimed. R xHal 3-xSi-NH-BR yHal 2-y(1) R : 1-20C hydrocarbon; Hal : Cl, Br or I; x : 1 or 2; y : 0 or 1. Independent claims are also included for the following: (i) A process for the production of a compound of formula (1) by reaction of a compound of formula (2) with a compound of formula (3) at -100 [deg]C to +25 [deg]C. (ii) A process for the production of a compound of formula (2) by reaction of a compound of formula (4) with a compound of formula (5). (iii) Borosilazane compounds of formula (6). (iv) A process for the production of the borosilazane compound of formula (6) by reaction of a compound of formula (1) with at least a 4-8 fold molar quantity of a compound of formula (7) at -80 to +300 [deg]C. (v) Oligo- or polyborosilazane compounds prepared by reaction of a compound of formula (1) and/or a compound of formula (6) with a compound of formula (7) or by polymerization of a compound of formula (1) or formula (4) so that it contains the structural groups C-Si-N-B, Si-N-B-C and/or C-Si-N-B-C. (vi) A process for the production of a siliconboroncarbonitride ceramic by heat treatment of a borosilazane compound of formula (6) or an oligo- or polyborosilazane compound in an inert or an amine and/or NH 3-containing atmosphere at 800-1700 [deg]C. (vii) The resulting silicon boroncarbonitride ceramic containing C-Si-N-B, Si-N-B-C and/or C-Si-N-B-C structural units and greater than 93 wt.% Si, N, B and C. (viii) A process for the production of a composite ceramic of SiC, Si 3N 4and BN by heating a siliconboroncarbonitride ceramic at above 1700 [deg]C. (ix) The resulting composite ceramic prepared by crystallization of a silicon boroncarbonitride ceramic containing molecularly dispersed SiC, Si 3N 4and BN. (x) Ceramic fibers prepared by melt spinning a polyborosilazane compound under an inert atmosphere, treating the spun green fibers, optionally in a separate process step with a reactive gas, preferably NH 3, ethylene diamine, trichlorosilane, dichlorosilane, borane-dimethylsulfide adduct, borane-triethylamine adduct, B 2H 6or with electromagnetic radiation or particle beam irradiation to render them unmeltable and heating the hardened green fibers at 800-1600 [deg]C, preferably 1200 [deg]C. R xHal 3-xSi-NH-SiR 3(2) BR yHal 3-y(3) R xSiHal 4-x(4) R 3Si-NH-SIR 3(5) (R'R''N) qR xHal 3-x-qSi-NH-BR yHal 2-y-z(NR'R'') z(6) R'R''NH (7) R', R'' : H or 1-20C hydrocarbon; q : 0-2; z : 0-2; q+z = 1; x+q = 3; y+z = 2.