摘要:
The invention relates to a method for producing fluorinated polysilanes. Hydrogen fluoride and/or hexafluorosilicic acid, which are obtained in particular during acid digestion of mineral phosphates in the production of phosphate fertilisers, are used for the production of SiF 4 . The SiF 4 obtained is thermally or plasma-chemically converted to fluorinated polysilane. The method is particularly efficient and cost-effective.
摘要:
The invention relates to kinetically stable halogenated polysilanes as a mixture of compounds having respectively at least four silicon atoms which are bound together, the substituents thereof comprising chlorine, and chlorine and hydrogen, and in the composition thereof, the atomic ratio of substituent to silicon is at least 1:1, wherein a) said kinetically stable halogenated polysilanes have a kinetically high stability in relation to oxidative splitting by chlorine, and the degree of conversion at temperatures of 120 °C within 10 hours with an excess of chlorine gas at 1013 hPa does not exceed 30 mol %, and b) said kinetically stable halogenated polysilanes have a percentage of branching points in the polysilane molecules of more than 8 mol%, in particular more than 11 mol%. Said kinetically stable halogenated polysilanes offer novel uses compared to less stable conventional halogenated polysilanes.
摘要:
The invention relates to bodies, coated by a SiC hard material layer or by a layer system comprising at least one SiC hard material layer, and to a method for producing said type of coated bodies. The aim of the invention is to supply bodies with SiC layers that have a particle-free, non-porous structure, a high degree of hardness, low brittleness, high bond strength, good oxidation resistance and a high resistance to crack growth. According to the invention, the bodies are coated by a SiC layer or a multi-layer coating system comprising at least one SiC layer, wherein the SiC layer comprises nano-crystalline 3C-SiC comprising halogen or a mixed layer comprising nano-crystalline 3C-SiC comprising halogen and amorphous SiC or nano-crystalline 3C-SiC comprising halogen and amorphous carbon. The coating of said bodies is carried out in a thermal CVD process, wherein a gas mixture comprising H 2 and/or one or more inert gases, one or more of the halogen polysilanes of the formulae Si n X 2n , Si n X 2n+2 , Si n X y H z , wherein X is the halogen and n ≥ 2 and one or more hydrocarbons is used. Alternatively according to the invention a gas mixture comprising one or more substituted halogen polysilanes having organic substitutes R of the general formulae Si n X y R z or Si n H x X y R z is used in H 2 and/or one or more inert gases, wherein X is the halogen and n ≥ 2, z > 0, y ≥ 1. The stoichiometric ratios 2n+2 = y +z or 2n=y+z apply for Si n X y R z and the stochiometric ratios 2n+2 = x+y+z or 2n=x+y+z apply for Si n H x X y R z.
摘要:
The invention relates to a method for producing ammonia. Using SiO 2 and/or Al 2 O 3 or SiO 2 - and/or AI 2 O 3 -containing material, silicon nitride and/or aluminum nitride is obtained, which is reacted with water in the presence of a basic alkali and/or earth alkali metal compound at an elevated temperature to form ammonia and alkali and/or earth alkali metal silicates. The method enables particularly effective utilization of natural resources.
摘要翻译:本发明涉及一种生产氨的方法。 使用SiO 2和/或Al 2 O 3或含SiO 2和/或Al 2 O 3的材料,获得氮化硅和/或氮化铝,其在碱性碱和/或碱土金属存在下与水反应 金属化合物在高温下反应生成氨和碱金属和/或碱土金属硅酸盐。 该方法能够特别有效地利用自然资源。
摘要:
The invention relates to a process for preparing hydrogen. According to the invention, monosilane or polysilane is converted to hydrogen at elevated temperature with steam or oxygen.
摘要:
According to at least one embodiment of the invention, a photoluminescent and/or electroluminescent material is specified, comprising a polysilane with at least one stilbene and/or styrene structural element. A method for producing such a material is also disclosed. The material is characterised by easy handling and easy technical processability. The use thereof and an optoelectronic component with this material are also specified.
摘要:
A method for producing tetrahalosilanes (SiX 4 ) (X = halogen, especially Cl, F) from processed rock masses containing highly viscous hydrocarbons and SiO 2 and/or silicates or from the residual masses accumulating in the preparation is described. In the first variant of the method, the masses are heated in a flow of hydrogen halide, and the resultant (SiX 4 ) is collected and distilled. In the second variant, hydrogen fluoride (HF) and/or alkali or alkaline earth fluoride and sulfuric acid are added to the masses and the resulatnt (SiX 4 ) is collected and distilled. The method is characterized by an especially high efficiency, since the carbon that is present in the raw materials or residual masses is effectively used as a reducing agent or energy source.
摘要:
A process for preparing hydrogenated polygermasilane as a pure compound or mixture of compounds includes hydrogenating halogenated polygermasilane.