Reference

Silicon nitride-containing ceramics

Silicon nitride-containing ceramics. Cannady, John P. (Dow Corning Corp. , USA). U.S. US 4535007 A 13 Aug 1985, 11 pp. (English). (United States of America). CODEN: USXXAM. CLASS: ICM: B05D003-02. NCL: 427226000. APPLICATION: US 84-627260 2 Jul 1984. DOCUMENT TYPE: Patent CA Section: 57 (Ceramics) Si3N4-contg. ceramics with decreased SiC content are prepd. from R3SiNH-contg. silazane polymers, where R = vinyl, H, Ph, or C1-3 alkyl radicals by first treating the polymer with a reactive metal halide from the group BCl3, BBr3, PCl3, PBr3, ZrCl4, SnCl4, HSiCl3, SiCl4, MeSiCl3, EtSiCl3 [115-21-9], PhSiCl3 [98-13-5], Me2SiCl2 [75-78-5], and (CH2 = CH) SiCl3 for a time sufficient to under the polymer infusible, followed by heating at 3750° in a vacuum or inert atm. The halide treatment may be a soln. or vapor phase process. Thus an Me3SiNH-contg. polymer with the compn. Si 45.9, C 23.1, N 22.1, and H 8.2 wt. % was dissolved in dried toluene under Ar. SiCl4 was then added and the reaction mixt. was stirred 1 h at room temp. and then stripped. After firing the infusible polymer at 1600° under N the resulting ceramic contained 69.0 Si3N4 and 3.2 wt.% C compared to 35.5 and 6.1 in a ceramic prepd. in the same manner using untreated polymer.

Routes for recycling of hydrogen chloride in the production of organochlorosilanes

Routes for recycling of hydrogen chloride in the production of organochlorosilanes. Andreev, V. I.; Marinova, N. V.; Derkach, O. N.; Tumanov, V. Yu.; Kozlova, G. I. (USSR). Khim. Prom-st. (Moscow), (9), 528-9 (Russian) 1984. CODEN: KPRMAW. ISSN: 0023-110X. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) Section cross-reference(s): 60 Waste HCl from the manuf. of phenyltrichlorosilane [98-13-5] and methylphenyldichlorosilane [149-74-6] monomers was purified from org. byproducts by low-temp. gas-liq. sepn. followed by condensation. Moist HCl, formed in the manuf. of Et silicates, was recycled into the manuf. of tech. grade hydrochloric acid, useful in the manuf. of methylchlorosilanes.