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公开(公告)号：US20210009461A1
公开(公告)日：2021-01-14
申请号：US16925944
申请日：2020-07-10
摘要： Described is a process for the refinement of a quartz powder, comprising the step of separating microparticles of refractory minerals, in particular minerals containing rare earth metal compounds, from the quartz powder by an elutriation step.
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公开(公告)号：US10852248B2
公开(公告)日：2020-12-01
申请号：US16523226
申请日：2019-07-26
发明人： Stefan Weidlich , Markus Schmidt
IPC分类号： G01N21/956 , G01N15/14 , G01N21/53
摘要： One aspect is an apparatus for analyzing particles a capillary as a measuring cell with a hollow channel for receiving or passing through a test sample containing the particles includes a light source for generating a light beam, an optical device for coupling the light beam into the hollow channel at an input point for the purpose of illuminating the test sample, and a detector for detecting scattered light exiting the hollow channel. In one aspects, the hollow channel has an internal diameter DH in the range of 10 μm to 60 μm, that the light beam has a radial light intensity distribution with a minimum beam diameter DL, wherein the following applies to the diameter ratio DL/DH: 0.05
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公开(公告)号：US10358373B2
公开(公告)日：2019-07-23
申请号：US15602919
申请日：2017-05-23
摘要： A method for producing a pore-containing opaque quartz glass includes: (a) producing porous SiO2 granulate particles from synthetically produced SiO2, (b) thermally densifying the SiO2 granulate particles to form partly densified SiO2 granulate particles, (c) forming a dispersion from the partly densified SiO2 granulate particles, (d) comminuting the partly densified SiO2 granulate particles to form a slip containing comminuted SiO2 granulate particles, (e) shaping the slip into a shaped body and forming a porous SiO2 green body with a green density rG, and (f) sintering the SiO2 green body into opaque quartz glass. To produce opaque quartz glass that is also suited for the use of spray granulate, during step (b), partly densified SiO2 granulate particles are produced with a specific surface BET-(A) between 0.025 and 2.5 m2/g, and during step (d), comminuted SiO2 granulate particles are produced with a specific surface BET-(B) between 4 and 10 m2/g.
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公开(公告)号：US10315947B2
公开(公告)日：2019-06-11
申请号：US15647881
申请日：2017-07-12
发明人： Boris Gromann , Nigel Whippey
IPC分类号： B23K101/06 , B23K26/53 , C03B23/07 , C03B23/08 , C03B23/053 , B23K26/38 , B23K103/00
摘要： A method for forming a hollow cylinder, in a single step, into a quartz glass tube with a large outer diameter and high dimensional stability is provided. To produce the tube, the cylinder, while rotating, is softened in portions in a heating zone which is moved at a relative feed rate Va and the softened portion is radially expanded by a centrifugal force and/or internal overpressure applied in the hollow cylinder bore so as to form a deformation zone. The radial expansion of the softened portion is carried out at a location-dependent radial expansion rate Vr, the profile of which along the deformation zone has a maximum value Vr,max which is smaller than 20 cm/min. The temperature in a rear heating portion of the heating zone, assigned to the end of the deformation zone, is lower than in a front heating portion assigned to the beginning of the deformation zone.
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公开(公告)号：US20190092674A1
公开(公告)日：2019-03-28
申请号：US16062303
申请日：2016-12-16
发明人： Matthias Otter , Michael Hünermann , Nils Christian Nielsen , Frank Wessely , Andreas Schreiber , Björn Roos , Gerrit Scheich
摘要： One aspect relates to a process for the preparation of a quartz glass body. The process includes providing a silicon dioxide granulate from a pyrogenically produced silicon dioxide powder, making a glass melt out of silicon dioxide granulate, and making a quartz glass body out of at least part of the glass melt. The size of the quartz glass body is reduced to obtain a quartz glass grain. The quartz glass body is processed to make a preform and an opaque quartz glass body is made from the preform. One aspect further relates to an opaque quartz glass body which is obtainable by this process. One aspect further relates to a reactor and an arrangement, which are each obtainable by further processing of the opaque quartz glass body.
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公开(公告)号：US20190062197A1
公开(公告)日：2019-02-28
申请号：US16061558
申请日：2016-12-16
发明人： Matthias OTTER , Walter LEHMANN , Michael HÜNERMANN , Nils Christian NIELSEN , Mirko WITTRIN , Markus WILDE
IPC分类号： C03C1/02 , C03B20/00 , C03B37/027 , C03B37/012 , C03C3/06
摘要： The invention relates to a process for the preparation of a quartz glass body comprising the process steps i.) Providing a silicon dioxide granulate obtainable from a silicon dioxide powder, wherein the silicon dioxide granulate has a larger particle size than the silicon dioxide powder, ii.) Making a glass melt out of silicon dioxide granulate and iii.) Making a quartz glass body out of at least part of the glass melt, wherein the melting crucible has at least one inlet and at least one outlet, wherein at least part of the glass melt is removed via the melting crucible outlet. The invention further relates to a quartz glass body which is obtainable by this process. The invention further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body.
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17.发明申请公开(公告)号：US20190010073A1
公开(公告)日：2019-01-10
申请号：US16030179
申请日：2018-07-09
摘要： In a known method for producing a quartz glass component, a crystal formation layer containing a crystallization promoter is produced on a coating surface of a base body of quartz glass. Starting therefrom, to provide a method for producing a quartz glass component of improved thermal strength and long-term stability which displays a comparatively small deformation particularly also in the case of rapid heating-up processes, it is suggested according to one aspect that a porous crystal formation layer containing amorphous SiO2 particles is produced with a mean thickness in the range of 0.1 to 5 mm, and that a substance which contains cesium and/or rubidium is used as the crystallization promoter.
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18.发明申请公开(公告)号：US20180113052A1
公开(公告)日：2018-04-26
申请号：US15785690
申请日：2017-10-17
发明人： Maximilian SCHMITT , Bodo KÜHN
摘要： A method for determining the refractive index profile of a preform is provided. The method involves: preparing the measured deflection angle distribution, including an extreme value determination of the deflection angle distribution, to obtain a prepared deflection angle distribution; transforming the prepared deflection angle distribution into a prepared refractive-index profile; evaluating the prepared refractive-index profile for the fixation of orientation values for the layer radius and for the layer refractive index of a hypothetical refractive index profile; generating a simulated deflection angle distribution on the basis of the hypothetical refractive-index profile with the orientation values, and transforming the deflection angle distribution into a simulated refractive-index profile; fitting the simulated refractive index profile to the prepared refractive-index profile by iterative adaptation of parameters to obtain a fitted, simulated refractive-index profile which is defined by adapted parameters, and obtaining the refractive index profile as the hypothetical refractive-index profile with the adapted parameters.
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公开(公告)号：US20170369359A1
公开(公告)日：2017-12-28
申请号：US15634634
申请日：2017-06-27
发明人： Hardy BAIERL , Stephan GRIMM , Kay SCHUSTER , Jan DELLITH , Andreas LANGNER , Gerhard SCHOETZ , Walter LEHMANN , Thomas KAYSER
CPC分类号： C03C3/06 , C03B19/066 , C03B20/00 , C03B32/00 , C03B2201/12 , C03B2201/20 , C03B2201/34 , C03B2201/36 , C03C2201/32 , C03C2201/3488 , C03C2203/52 , H01S3/17
摘要： A method for producing rare earth metal-doped quartz glass includes the steps of (a) providing a blank of the rare earth metal-doped quartz glass, and (b) homogenizing the blank by softening the blank zone by zone in a heating zone and by twisting the softened zone along a rotation axis. Some rare earth metals, however, show a discoloration of the quartz glass, which hints at an unforeseeable and undesired change in the chemical composition or possibly at an inhomogeneous distribution of the dopants. To avoid this drawback and to provide a modified method which ensures the production of rare earth metal-doped quartz glass with reproducible properties, during homogenization according to method step (b), the blank is softened under the action of an oxidizingly acting or a neutral plasma.
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公开(公告)号：US20170327403A1
公开(公告)日：2017-11-16
申请号：US15647881
申请日：2017-07-12
发明人： Boris GROMANN , Nigel WHIPPEY
IPC分类号： C03B23/053 , C03B23/08 , C03B23/07
CPC分类号： C03B23/053 , B23K26/38 , B23K26/53 , B23K2101/06 , B23K2103/54 , C03B23/07 , C03B23/08
摘要： A method for forming a hollow cylinder, in a single step, into a quartz glass tube with a large outer diameter and high dimensional stability is provided. To produce the tube, the cylinder, while rotating, is softened in portions in a heating zone which is moved at a relative feed rate Va and the softened portion is radially expanded by a centrifugal force and/or internal overpressure applied in the hollow cylinder bore so as to form a deformation zone. The radial expansion of the softened portion is carried out at a location-dependent radial expansion rate Vr, the profile of which along the deformation zone has a maximum value Vr,max which is smaller than 20 cm/min. The temperature in a rear heating portion of the heating zone, assigned to the end of the deformation zone, is lower than in a front heating portion assigned to the beginning of the deformation zone.
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