摘要:
The invention relates to optical quality glass made by vacuum casting very stable, low viscosity aqueous suspension of submicron silica particles. The suspension is a mixture of silica particles and aqueous ammonia, and is characterized by a solid loading of up to 75 weight percent.
摘要:
A low cost aqueous injection molding process for glass and glass-ceramic components is provided. The process begins with a powder comprising SiO2 (42-59 wt. %), Al2O3 (17-35 wt. %), MgO (2-25 wt. %) and also BaO (0-20 wt. %), TiO2 (0-12 wt. %), ZnO (0-10 wt. %), CaO (0-10 wt. %), B2O3 (0-5 wt. %), P2O5 (0-5 wt. %), ZrO2 (0-5 wt. %). The powder is then mixed with a solvent and a gel forming agent to form a mixture which is injected into a mold. Importantly, the mixture is maintained, prior to injection, at a temperature above the gel point of the gel forming agent. The mixture is then cooled in the mold to a temperature below the gel point of the gel forming agent to form a green body. The green body is removed from the mold and sintered to form the glass-ceramic header.
摘要翻译:提供了用于玻璃和玻璃 - 陶瓷部件的低成本水性注射成型方法。 该方法开始于包含SiO 2(42-59重量%),Al 2 O 3(17-35重量%),MgO(2-25重量%)和BaO(0-20重量%),TiO 2 0〜10重量%,ZnO(0〜10重量%),CaO(0〜10重量%),B 2 O 3(0〜5重量%),P 2 O 5(0-5重量%),ZrO 2 0-5重量%)。 然后将粉末与溶剂和凝胶形成剂混合以形成注入模具的混合物。 重要的是,混合物在注射之前保持在高于凝胶形成剂凝胶点的温度。 然后将混合物在模具中冷却到低于凝胶形成剂的凝胶点的温度以形成生坯。 将生坯从模具中取出并烧结以形成玻璃陶瓷集管。
摘要:
The present invention relates to the production of a vitreous-siliceous material from broken glass which is used for the inner or outer finishing of buildings and structures, floors or for realising artistic decorative panels. The purpose of this invention is to improve the article quality and to increase the yield while reducing the production costs. The method for producing cladding and decorative tiles is characterised in that it involves applying an action on the preform in a first heated and enclosed volume, wherein said action not only consists of the heat supplied from the top by a heater but also consists of a direct gaseous air flow conveying the heat accumulated from the previously molten preform. This flow is supplied from the bottom and, to this end, the bottom of the thermal form is heat- and gas-conducting. This invention also relates to a modular plant for the serial production of said cladding and decorative tiles, wherein said plant includes a thermal cover mounted above a frame so as to be capable of being lifted back. The frame also includes a mechanism mounted therein for lifting the thermal forms towards the thermal cover. Each thermal form includes a lower thermal-insulation lid. The bottom of each thermal form is made of a heat- and gas-conducting material which is porous or comprises reduced-size cells.
摘要:
This invention is directed to lithium disilicate (Li2 Si2 O) based glass-ceramics comprising silica, lithium oxide, alumina, phosphorus pentoxide, and optionally potassium oxide or tantalum oxide. The glass-ceramics are useful in the fabrication of single and multi-unit dental restorations (e.g. anterior bridges) made by heat pressing into refractory investment molds produced using lost wax techniques. The glass-ceramics have good pressability, i.e., the ability to be formed into dental articles by heat-pressing using commercially available equipment. In accordance with an embodiment directed to the process of making the glass-ceramics, the starting compositions are melted at about 1200 DEG to about 1600 DEG C, thereafter quenched (e.g., water quenched or roller quenched) or cast into steel molds, or alternately, cooled to the crystallization temperature. The resulting glass is heat-treated to form a glass-ceramic via a one or two step heat-treatment cycle preferably in the temperature range of about 400 DEG to about 1100 DEG C. The resulting glass ceramics are then pulverized into powder and used to form pressable pellets and/or blanks of desired shapes, sizes and structures which are later pressed into dental restorations.
摘要:
This is a way to make a glass thing with anisotropic optical properties. A preform (10) with longitudinal passages is drawn thinner by a puller (18) so as to make a rod or fiber (16).
摘要:
A powder-formed cellular honeycomb body of novel tapered, curved and/or very high cell density configuration is provided through a reforming procedure wherein a precursor honeycomb shaped from a plasticized powder batch material is filled with a compatible plastic filler, reshaped at a temperature at which the plastic deformation characteristics of the honeycomb and filler are matched, and then solidified after removal of the filler to fix the final configuration of the body.
摘要:
According to known methods and devices for producing hollow glass shapes by mould blowing, the initial glass is prepared in a tank furnace glass melting process. Said tank furnace and the hollow glass production process downstream are directly connected so that a range of undesirable interactions can occur, for example uneven treatment in the tank furnace leading to an unreliable melting quality, restricted fusing of clear glass, uneconomical production due to small batch sizes, etc. The aim of the invention is to provide an economical method of producing hollow glass shaped bodies which can be carried out independently of the tank furnace glass melting process. To this end, the raw glass material join the production process in the form of semi-products (2) which correspond with the product being manufactured (1). Stocks of said semi-products are produced in a separate process and are not heated until immediately before the blowing process, at which point they are heated to the necessary blowing temperature. The semi-product (2) is advantageously cast in an optimised ring-shaped semi-product support (3). Said semi-product support (3) serves to protect the semi-product (2) during transportation and is also a functional component in production i.e. the blowing working ring in the blow mould unit (11). In this regard, a modular structure of the production device guarantees high flexibility in finishings.
摘要:
The invention concerns a process for preparing glass, more specifically glass powder or glass films, together with a process for conditioning the raw materials intended for preparing glass characterised in that said raw materials are converted to freely flowing powder suitable for feeding to a plasma torch in which said powder is converted to glass.
摘要:
A quartz glass article is made from a fired porous silica body or preform having internal pores with chemically-bound hydroxyl groups or other surface reactive groups that react with nitrogen. After a nitrogen-containing reducing gas is introduced to those pores, the preform is heated in such manner as to provide the quartz glass with an effective amount of chemically-combined nitrogen, no less than 25 ppm. A minute amount of chemically-combined nitrogen in the high-purity quartz glass is sufficient to provide a tremendous improvement in physical properties and an incredible increase in the resistance to devitrification. In another embodiment the porous silica preform is fired in steam to increase the hydroxyl content and then nitrided in a nitrogen-hydrogen reducing atmosphere.
摘要:
A method of processing glass, the method comprising selecting a glass-based precursor having a plurality of precursor properties; selecting a source of electromagnetic ("EM") radiation; wherein at least one of said precursor properties is optimised for use with said EM source; and transforming said precursor into a three dimensional glass-based product using said EM source.