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. RxHal3-xSi-NH-BRyHal2-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 NH3-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, Si3N4 and 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, Si3N4 and 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 NH3, ethylene diamine, trichlorosilane, dichlorosilane, borane-dimethylsulfide adduct, borane-triethylamine adduct, B2H6 or 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. RxHal3-xSi-NH-SiR3 (2) BRyHal3-y (3) RxSiHal4-x (4) R3Si-NH-SIR3 (5) (R'R''N)qRxHal3-x-qSi-NH-BRyHal2-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.