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公开(公告)号：US4915158A
公开(公告)日：1990-04-10
申请号：US203249
申请日：1988-06-06
IPC分类号： B22D11/06
CPC分类号： B22D11/0668
摘要： A method and belt composition for improving the performance and flatness of thin revolving flexible casting belts of continuous casting machines wherein at least one wall of the moving mold is provided by a thin flexible endless metallic casting belt having a permanent insulative coating with fluid-accessible porosity in this permanent coating. Contrary to prior methods and apparatus which have sought to protect the wide thin casting belts, the present method for improving belt flatness and performance involves providing a Helium-containing gaseous film between the metal and the front face of the casting belt which is coated with a permanent insulative porous coating. For significantly improved results, this gaseous film contains at least 8 percent and preferably 15 percent and optimally 20 percent or more of Helium by volume and is non-reactive with the metal being cast, resulting in a controlled increase in the rate of heat transfer and for causing such heat transfer to become more nearly uniform and stabilized across the width of the flexible casting belt than in prior continuous casting machines of the same moving mold cross-sectional shape and size. The freezing rate advantageously becomes stabilized at a substantially higher and more uniform rate, the belt flatness becomes stabilized and the cast metallic product is thereby substantially improved both in metallurgy and surface appearance. Also, copper or copper alloy casting belts are used in certain embodiments for enhancing heat-transfer effects and belt flatness. During casting at a given speed, the freezing rate and exit temperature of the metal being continuously cast can be controlled by varying the helium percentage in the gaseous film itself. In twin-belt machines, relative heat-transfer rates into upper and lower belts are controlled by adjusting the relative helium percentages in their respective gas films.
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公开(公告)号：US4749027A
公开(公告)日：1988-06-07
申请号：US118404
申请日：1987-11-09
IPC分类号： B22D11/06 , B22D11/124
CPC分类号： B22D11/0668
摘要： A method and belt composition for improving the performance and flatness of thin revolving flexible casting belts of continuous casting machines wherein at least one wall of the moving mold is provided by a thin flexible endless metallic casting belt having a permanent insulative coating with fluid-accessible porosity in this permanent coating. Contrary to prior methods and apparatus which have sought to protect the wide thin casting belts, the present method for improving belt flatness and performance involves providing a Helium-containing gaseous film between the metal and the front face of the casting belt which is coated with a permanent insulative porous coating. For significantly improved results, this gaseous film contains at least 8 percent and preferably 15 percent and optimally 20 percent or more of Helium by volume and is non-reactive with the metal being cast, resulting in a controlled increase in the rate of heat transfer and for causing such heat transfer to become more nearly uniform and stabilized across the width of the flexible casting belt than in prior continuous casting machines of the same moving mold cross-sectional shape and size. The freezing rate advantageously becomes stabilized at a substantially higher and more uniform rate, the belt flatness becomes stabilized and the cast metallic product is thereby substantially improved both in metallurgy and surface appearance. Also, copper or copper alloy casting belts are used in certain embodiments for enhancing heat-transfer effects and belt flatness. During casting at a given speed, the freezing rate and exit temperature of the metal being continuously cast can be controlled by varying the helium percentage in the gaseous film itself. In twin-belt machines, relative heat-transfer rates into upper and lower belts are controlled by adjusting the relative helium percentages in their respective gas films.
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3.发明授权Matrix coatings on endless flexible metallic belts for continuous casting machines method of forming such coatings and the coated belts 失效用于连续铸造机的无端柔性金属带上的基体涂层形成这种涂层和涂层带的方法
公开(公告)号：US4588021A
公开(公告)日：1986-05-13
申请号：US549752
申请日：1983-11-07
CPC分类号： B22D11/0671 , B22D11/0668 , C23C4/14
摘要： A unitary-layer partially metallic, suitably adherent, mechanically and thermally durable, non-wetting, fusion-bonded matrix coating on endless, flexible metallic casting belts for continuous casting machines is described. This fusion-bonded matrix coating is also advantageous for coating other molten-metal-contacting surfaces, in continuous casting machines, such as edge-dam blocks that define moving side walls of a mold cavity. The fusion-bonded matrix (or reticulum) coating provides advantageous accessible porosity throughout the coating and comprises a nonmetallic refractory material interspersed substantially uniformly throughout a matrix of heat-resistant metal or metal alloy, for example nickel or nickel alloy, which is fusion-bonded to the grit-blasted surface of the belt and anchors and holds the nonmetallic material. The coating is applied by thermally spraying a powdered mixture directly on the roughened surface. The result is to insulate and protect the underlying belt from intimate molten metal contact, from heat stress and consequent distortion and from chemical or stress-corrosive action by the molten metal or its oxides or slags. The nonmetallic material may be present, at least partly, in the form of isolated particles encased within the metallic reticulum and/or in the form of a second reticulum intertwined with the metallic reticulum. The life of the coated belts is dramatically increased, and the surface quality and properties of the cast product are significantly improved. The coating controls and renders more uniform the rate of freezing of the metal being cast, resulting in improved metallurgical properties. Formulations are described and a method of forming such coatings by thermal spraying.
摘要翻译： 描述了用于连续铸造机器的环形柔性金属铸造带上的单层部分金属，适当粘附的机械和耐用耐久性，非润湿的，熔合的基质涂层。 这种熔融基质涂层对于在连续铸造机器（例如限定模腔的移动侧壁的边缘坝模块）中涂覆其它熔融金属接触表面也是有利的。 熔合基质（或网状）涂层在整个涂层中提供有利的可接近的孔隙，并且包括基本上均匀地散布在耐热金属或金属合金（例如镍或镍合金）的基体中的非金属耐火材料，其是熔合的 到达砂带的表面，并固定并保持非金属材料。 通过将粉末混合物直接喷涂在粗糙表面上来施加涂层。 结果是绝缘并保护下面的带免于紧密的熔融金属接触，不受热应力和随之而来的变形以及熔融金属或其氧化物或炉渣的化学或应力腐蚀作用。 至少部分地，非金属材料可以以包裹在金属网内的分离的颗粒的形式存在，和/或以与金属网相互缠绕的第二网状的形式存在。 涂层带的使用寿命大大提高，铸造产品的表面质量和性能得到显着提高。 涂层控制并使得铸造的金属的冷冻速度更均匀，从而提高冶金性能。 本发明描述了制剂和通过热喷涂形成这种涂层的方法。
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