公开(公告)号：US20170158516A1

公开(公告)日：2017-06-08

申请号：US15320971

申请日：2015-06-19

Applicant: Wacker Chemie AG

Inventor： Simon PEDRON ,  Bernhard BAUMANN ,  Gerhard FORSTPOINTNER

IPC: C01B33/03 ,  C01B33/029 ,  B01J8/18

CPC classification number: C01B33/03 ,  B01J8/1827 ,  B01J8/1836 ,  B01J8/1872 ,  B01J2208/00761 ,  B01J2208/00902 ,  C01B33/027 ,  C01B33/029

Abstract: A fluidized-bed reactor for preparing granular polycrystalline silicon has a reactor vessel, a reactor tube and a reactor bottom within the reactor vessel, and an intermediate jacket located between the reactor tube and the reactor vessel, a heating device, at least one bottom gas nozzle for introducing of fluidizing gas and at least one secondary gas nozzle for introducing reaction gas, a silicon seed particle feed, an offtake line for granular polycrystalline silicon and reactor offgas discharge, wherein a main element of the reactor tube comprises at least 60% by weight of silicon carbide with a CVD coating having a layer thickness of at least 5 μm and is at least 99.995% by weight of SiC, or a main element of the reactor tube is a sapphire glass comprising at least 99.99% by weight of α-Al2O3.

公开(公告)号：US20190099730A1

公开(公告)日：2019-04-04

申请号：US16087416

申请日：2017-03-01

Applicant: Wacker Chemie AG

Inventor： Gerhard FORSTPOINTNER ,  Bernhard BAUMANN

IPC: B01J8/00 ,  B01J8/18 ,  C01B33/027 ,  F16K7/04

Abstract: Control of the flow of granular polysilicon granules is effected by employing an elastomeric pinch sleeve valve. The flow control by this method is especially useful for controlling the flow of silicon seed particles and granular polysilicon product in the fluidized bed method for producing polysilicon. The flow may be stopped without gas leakage, and is suitable for use over long operating campaigns.

公开(公告)号：US20180297852A1

公开(公告)日：2018-10-18

申请号：US15737967

申请日：2016-11-09

Applicant: Wacker Chemie AG

Inventor： Simon PEDRON ,  Bernhard BAUMANN

IPC: C01B33/027 ,  B01J8/18 ,  B01J8/24

Abstract: Campaigns for the production of polycrystalline silicon granules in a fluidized bed process are lengthened by employing an inner reaction tube within the fluidized bed reactor which has a low ash content, preferably a coefficient of thermal expansion similar to that of silicon carbide, and has a silicon carbide coating layer consisting of at least 99.995 wt. % of silicon carbide with a thickness of from 5 μm to 700 μm.

公开(公告)号：US20170204520A1

公开(公告)日：2017-07-20

申请号：US15326522

申请日：2015-08-26

Applicant: Wacker Chemie AG

Inventor： Gerhard FORSTPOINTNER ,  Bernhard BAUMANN ,  Michael FRICKE

IPC: C23C24/04

Abstract: Plastic material-comprising surfaces of a substrate are coated with elemental silicon by cold gas spraying by injecting a powder containing silicon into a gas and powder with a high velocity onto the substrate surface, such that the silicon forms a firmly adherent coat on the substrate surface comprising the plastics material. Apparatuses having such silicon-coated surfaces are useful in minimizing contamination of polycrystalline silicon production, processing, packaging, and transport.