213results about "Pot furnaces" patented technology

A sulfide-based lithium-ion-conducting solid electrolyte glass is formed from sulfide-based lithium-ion-conducting solid electrolyte, and α-alumina.

The present invention relates to resorbable glass scaffolds for use in biological applications and methods for making same. Specifically, these scaffolds are composed of phosphate glass fibers, where the rate of dissolution into biological fluids is controlled by the length of time the glass is held above its melt temperature prior to spinning the fiber.

The invention relates to a device for the production of high-melting glass materials or high-melting glass ceramic materials, comprising a vessel for accommodating molten glass and a container that accommodates the vessel, whereby the vessel has a tubular outlet. According to the invention, the device is characterised by the fact that the vessel and a first section of the tubular outlet if formed of iridium or a material with a high iridium content, whereby the container is designed to accommodate the vessel and the first section of the tubular outlet under a protective gas atmosphere. The invention also relates to a corresponding method. The molten glass is shaped into a formed part in a discontinuous operation. The choice of the material for the vessel used as the crucible allows the attainment of high temperatures according to the invention which enables glass materials or glass ceramic materials with a much higher spectral transmission in the visible wavelength range. The use of an inert protective gas enables the prevention of unwanted oxide formation on the vessel and the tubular outlet. According to the invention, the glass can be used as a transitional glass between types of glass with very different coefficients of thermal expansion.

An energy-efficient device for refining a glass melt to produce a glass and/or a glass ceramic is provided. The device includes a refining crucible defined at least by lateral walls with a metallic lining as a melt contact surface, so that a melt refining volume is defined by a base surface, a top surface and a circumferential surface; at least one heating device that conductively heats the lining by an electric current in the lining, so that the melt is heated through the lining, the heating device and the lining are connected to one another by a feeding device. The feeding device establishes contact with the lining so that an electric current runs from the top surface to the base surface or from the base surface to the top surface, at least in sections of the lining.

A melting furnace for insulating materials is provided with a cooled crucible (10) having continuous metal side malls, a partitioned and cooled bottom (12) and at least one induction coil (28) placed under the bottom which serves as the sole heating means. The depth of the melting bath contained in the crucible and the excitation frequency of the induction coil are selected so that the depth and half of the inside radius of the crucible are less than the skin thickness of the bath.

A silica glass crucible includes a stable, bubble-free inner layer and an opaque outer layer, both layers demonstrating reduced bubble growth during a Czochralski process. When used in the CZ process, little volume change is observed in the crucible wall, and the crucible has little influence on melt level. The present crucible is especially suited for slow silicon ingot pulling with reduced crystalline defects. The fusion process of the present invention controls the dynamic gas balance at the fusion front where formed grain is melted to dense fused silica.

Process for confinement of waste containing at least one chemical species to be confined, by in-can vitrification in a hot metal can into which waste and a vitrification additive are added, the waste and the vitrification additive are melted to obtain a glass melt which is then cooled, characterised in that at least one oxidising agent is also added into the metal can and in that the concentration of oxidising agent(s) expressed as oxide(s) in the glass melt is between 0.1 and 20% by mass, preferably 4 and 20% by mass, even more preferably 5 and 15% by mass, and even more preferably 10 and 13% by mass of the glass melt mass.

A continuous method of manufacturing large aperture transparent quartz glass tube for semiconductor technology, which is characterized in that high pure quartz sand of quartz glass material is added in a continuous melting furnace, through electric heating and fusing, fused quartz glass liquid is drew as large aperture transparent quartz glass tubes through a former, a material stage and a tube drawing machine; the high pure quartz sand added in the continuous melting furnace, before heating and fusing, preheating the high pure quartz sand 200-280 minutes to 750-850 DEG C, then heating and fusing; the upper part of the continuous melting furnace tungsten-molybdenum crucible is a preheating section, the lower part is a fusing section, the preheating treatment is processed in the preheating section; the diameter of the tungsten-molybdenum crucible is 340-360 mm, height is 1400-1600 mm; the fusing temperature in the continuous melting furnace is 2150-2250 DEG C; the diameter of the former is 244-264 mm; the current passing through the continuous melting furnace for electric heating molybdenum electrode is 215-225 A, the voltage is 19-20 V. The obtained quartz tube has wide gauge, good quality, can be fully suitable for semiconductor technical requirement.

One aspect relates to a process for the preparation of a quartz glass body, including providing a silicon dioxide granulate, 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 silicon dioxide granulate is obtained by providing and processing a silicon dioxide powder. One aspect also relates to silicon dioxide granulate, which is obtained by providing a silicon dioxide powder and processing it. One aspect further relates to a quartz glass body which is obtainable by this process. One aspect further relates to a light guide, an illuminant and a formed body, which are each obtainable by further processing of the quartz glass body.

The invention relates to an apparatus and a method for low-contamination melting of high-purity, aggressive and/or high-melting glass or glass-ceramic. According to the invention, for this purpose a melt is heated in a crucible or melting skull crucible by means of high-frequency radiation and is mixed or homogenized in the melting crucible. It is preferable for a gas nozzle, from which gas bubbles, e.g. oxygen bubbles (known as O₂ bubbling), escape into the melt, to be provided at the base of the crucible. This alone makes it possible to achieve surprising multiple benefits in the melting skull crucible. Firstly, unmelted batch which drops into the melt in solid form, for example from above, is melted down more quickly as a result of more intensive mixing with the liquid fraction of the melt, secondly the temperature distribution in the melt is made more even, thirdly a uniform distribution or mixing of different glass constituents is achieved, and fourthly the redox state of the glass can be adjusted.

The invention relates to a process for preparing a quartz glass body comprising the process steps i.) Providing a silicon dioxide granulate, ii.) Making a glass melt from the silicon dioxide granulate in a melting crucible, and iii.) Making a quartz glass body from at least a part of the glass melt, wherein the melting crucible is comprised in an oven and is made of at least one material comprising tungsten or molybdenum or a combination thereof. The invention further relates to a quartz glass body which can be obtained by this process. Further, the invention relates to a light guide, an illuminant and a formed body, each of which can be obtained by processing the quartz glass body further.

The invention, which relates to a detachable optical glass successive melting furnace and belongs to the technical field of optical glass melting devices, mainly solves the problem that the present melting furnaces highly lead to the aging of platinum vessels which further results in the damage of the platinum vessels, the blowing out of furnaces and long maintenance time. The detachable optical glass successive melting furnace is characterized by comprising successively connected parts of a fusing-section smelting furnace, a heating-section smelting furnace, a clarification-section smelting furnace, a cooling-section pipeline and a working-section smelting furnace, wherein the fusing-section smelting furnace, the heating-section smelting furnace and the clarification-section smelting furnace are connected by connecting pipes; the fusing-section smelting furnace, the heating-section smelting furnace, the clarification-section smelting furnace and the working-section smelting furnace are all equipped with an independent heating device; and the connection pipelines connecting the fusing-section smelting furnace, the heating-section smelting furnace and the clarification-section smelting furnace and the cooling-section pipeline are all provided with a flow control device. The detachable optical glass successive melting furnace provided by the invention has the summing effect of minimizing the container expansion, reduces the crucible damage, is convenient for maintenance, raises the smelting furnace production efficiency, and is mainly used in optical glass successive melting furnaces which can be split and assembled.

The invention tellurate glass and a preparation method is disclosed, among which the basic compositions of the glass are 65-85 mol percent of TeO2, 0-20 mol percent PbO, 2-8 mol percent of PbF2, 0-10 mol percent of Bi2O3, 0-15 mol percent Nb2O5. , Being prepared through a common melting method. In the melting process, preparation technologies like stirring, putting into dry nitrogen and clarification are adopted to ensure that [OH-] mass in the glass compositions can be effectively removed. The glass material is characterized by good materialization stability, favorable fiber-forming, high third-order nonlinear susceptibility, small dispersion slope and so on; the preparation process has simple and easy operation and low cost. The invention is applicable to use optical fiber matrix material in super short pulser source of optical communication.

The invention discloses a continuous melting furnace for producing a quartz glass bar and a manufacture technology. The continuous melting furnace comprises a furnace body and a furnace cover which are matched to each other, wherein a tungsten crucible is arranged in the furnace body; a heating net and heat insulating sand are arranged outside the tungsten crucible, and the heating net is connected with an electrode; high-temperature bricks, a water sleeve and a dust removing device are arranged at a port of the furnace; and the upper end of the tungsten crucible is communicated with a feeding device and a heat insulating device, and the lower end of the tungsten crucible is connected with a forming device. According to the continuous melting furnace disclosed by the invention, a mandril device in the tungsten crucible is removed; the forming device at the lower part of the tungsten crucible is used or stretching to form under a certain temperature; because the mandril device is removed, no bubble, air line and black core are generated; and moreover, the manufactured quartz glass bar has large diameter, and can be widely applied to industries such as a semiconductor industry, a solar energy industry and an optical fiber industry.

The invention relates to a process for the preparation of a quartz glass body comprising the process steps i.) Providing a silicon dioxide granulate, ii.) Making a glass melt from the silicon dioxide granulate in an oven, and iii.) Making a quartz glass body from at least a part of the glass melt, wherein the oven comprises a hanging sinter crucible. The invention also 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 the quartz glass body.

A quartz glass body and a process for the preparation of a quartz glass body is disclosed. In one aspect, the process includes providing a silicon dioxide granulate from a pyrogenic silicon dioxide powder, making a glass melt out of the silicon dioxide granulate and making a quartz glass body out of at least part of the glass melt. In at least one process a silicon component different from silicon dioxide is added. One aspect further relates to a quartz glass body which is obtainable by this process. A light guide, an illuminant and a formed body, are each obtainable by further processing of the quartz glass body.