537 results about "Strip casting" patented technology

The invention provides a ceramic composite material for a thin-strip casting side sealing plate and a preparation method thereof, relating to a ceramic composite material and a preparation method thereof and solving the problems that the traditional side sealing plate has high heat conductivity, serious abrasion, poor seal, high preparation cost and large energy consumption, can not be secondarily processed or reused. The ceramic composite material consists of zirconia, boron nitride and additives. The preparation method comprises the following steps: 1, weighing raw materials; 2, ball milling and mixing the raw materials; 3, drying to obtain uniform mixed powder; and 4, carrying out hot pressed sintering, pressureless sintering, air pressure sintering or hot isostatic pressed sintering on the mixed powder, so as to obtain the ceramic composite material for a thin-strip casting side sealing plate. The compactness of the ceramic composite material is 94%-99%, the bending strength of the ceramic composite material, tested by a three-point bending test at room temperature, is 260-420MPa, and the fracture toughness of the ceramic composite material, tested by a unilateral coped beam method, is 3-8 MPa.m<1/2>. The ceramic composite material can be widely applied to the field of side sealing plate materials.

At least two metallic materials containing element such as silicon and tin, which has ability of insertion and desertion of lithium element, and optionally another metallic material containing element such as copper are molten to prepare a melt. The melt is rapidly cooled by strip-cast method at a cooling rate of more than 2×10³ ° C./sec and no more than 10⁴ ° C./sec to be cast. Further, the cast is milled and classified into alloy powder having an average particle size of 0.1 μm to 50 μm. The alloy powder and conductive agent are laminated with binder onto a collector to obtain a negative electrode for a secondary battery. The negative electrode is employed to obtain a lithium secondary battery having high electric charge and discharge capacity, and good property of charge and discharge cycle.

Twin roll caster for continuously casting metal strip comprises a pair of parallel casting rolls (16) to which molten metal is supplied through a delivery nozzle (19). The rolls are mounted on roll carriers (104) moveable on a frame (102) to allow rolls (16) to move toward and away from one another. Biasing units (110, 111) allow inward biasing forces to be applied to the roll carriers (104) so as to bias one of the rolls (104) toward the other. The biasing units (110) incorporate biasing springs and means to adjust the thrust exerted by the springs.

The invention discloses a weather resisting steel produced by strip casting and a production method thereof. The weather resisting steel comprises the following components in mass percentage: 0.06-0.12% of C, 0.20-0.50% of Si, 0.20-0.50% of Mn, 0.15-0.22% of P, less than or equal to 0.008% of S, 0.65-0.80% of Cu, 0.30-0.70% of Cr, 0.12-0.40% of Ni and the balance Fe and inevitable impurities; molten steel smelted according to the above components is poured into a furnace hearth formed by a water-cooled casting roll and a side seal device which rotate oppositely and forms a casting band by being cooled by the water-cooled casting roll; the casting band is sent into an on-line mill via a pinch roll to be rolled into a hot-rolled strip, and the thickness of the casting band is 1-5mm; the cooling speed of the molten steel at least reaches 300 DEG C/s when contacting with the surface of a two-roller caster casting roll; the casting band after leaving the casting roll is hot rolled on line and has the deformation degree of 30-45%.The steel band produced with the strip casting process of the invention has no possibility of macrosegregation of elements such as phosphorus, copper and the like, is convenient and economic to produce, saves energy and lowers consumption.

A process for the production of low carbon steel strips having a good combination of strength an formability, as cast, and a good weldability after the pickling by usual processes, comprising the following steps: casting, in a twin rolls continuous casting machine (1) comprising pinch rolls (3), a strip with a thickness comprised between 1 and 8 mm, having the following composition as weight percentage of the total weight: C 0.02-0.10; Mn 0.1-0.6; Si 0.02-0.35; Al 0.01-0.05; S<0.015; P<0.02; Cr 0.05-0.35; Ni 0.05-0.3; N 0.003-0.012; and, optionally, Ti<0.03; V<0.10; Nb<0.035, the remaining part being substantially Fe; cooling the strip in the area comprised between the casting-rolls and the pinch rolls (3); hot deforming the strip cast through said pinch rolls (3) at a temperature comprised between 1000 and 1300° C. until reaching a thickness reduction less than 15%, in order to encourage the closing of the shrinkage porosites; cooling the strip at a speed comprised between 5 and 80° C./s down to a temperature (Tavv) comprised between 500 and 850° C.; and coiling into a reel (5) the so obtainable strip.

The invention discloses a twin-roll thin-strip casting side sealing plate. The side sealing plate comprises a panel containing boron nitride materials and a base plate with aluminum-silicon thermal insulation materials, wherein the panel and the base plate are fixed through adhesion. The invention also discloses a method for manufacturing the side sealing plate. As the thermal conductivity of thebase plate of the side sealing plate is much less than that of the panel, the heat of the base plate is not easy to dissipate, and heat-insulation effect is improved so as to ensure the quality of theside parts of strip steel. Moreover, equal thermal expansion coefficients of the base plate and the panel can avoid twist deformation or cracking after the side sealing plate is heated. Modified silicone resin binder resistant to high temperature not only enhances bonding strength, but also plays a role in thermal insulation.

An aluminum alloy fin stock of lower (more negative) corrosion potential and higher thermal conductivity is produced by a process, which comprises continuously strip casting the alloy to form a strip, cold rolling the strip to an intermediate gauge sheet, annealing the sheet and cold rolling the sheet to final gauge. Lower corrosion potential and higher thermal conductivity are imparted by carrying out the continuous strip casting while cooling the alloy at a rate of at least 300 DEG C./second, e.g. by conducting the casting step in a twin-roll caster.

The invention discloses a rare earth aluminum alloy used for heat exchangers in the technical field of metal materials and a preparation method thereof. The composition ratio of the alloy is: Si: 0.06-0.5%, Mn: 1.1-1.9%, Cu: 0.3 ~1.0%, Mg: 0~0.7%, Fe: 0.1~0.6%, Zr: 0~0.2%, Ti: 0~0.2%, Ce or rare earth mainly composed of Ce element: 0.06~0.5%, impurity element content Less than 0.05%, the rest is Al. The invention realizes microalloying and microstructure control by adding rare earth elements to low-silicon and high-manganese aluminum alloys, and adopts casting, hot-rolling and cold-rolling processes to prepare corresponding plates and strips.

The invention provides a method for controlling side seal of twin roll thin strip casting. The method comprises the following steps: the number and size of burrs on the edge part of a cast belt are detected in real time by adopting a detection device; according to detection feedback data and target data comparison, a side seal plate support system regulates the working height of a side seal plate, so that the height difference of the groove on the lower part of the side seal plate and the freezing point (kiss point) of the cast belt is kept to be between 0.1 and 2mm, meanwhile, the side seal plate is kept to be constantly contacted with the end face of a crystal roll so as to improve the edge part quality of the cast belt. The working position of the side seal plate is correspondingly regulated by detecting the edge part quality of the cast belt, so that the quality defect of the edge part of the cast belt is reduced, the cast belt quality is improved, abrasion of the side seal plate can be reduced, and the requirement on long term casting of thin strip continuous casting can be met. The side seal plate support control system comprises a position control mode and a pressure control mode, and is suitable for the whole casting process.

The invention relates to fibers, in particular to tourmaline-containing sheath-core composite fibers. The tourmaline-containing sheath-core composite fibers are prepared through the following steps: (1) tourmaline processing; (2) core layer material processing, that is, bast fibers and palm fibers after degumming processing are combed and cut into short bast fibers and short palm fibers, the short bast fibers and the short palm fibers are then soaked in a mixed manner in a lignocellulose aerogel solution for 15 to 20 minutes according to a formula, the short bast fibers and the short palm fibers after the mixed soaking are then taken out for draining, the short bast fibers and the short palm fibers after the draining are sent to an opener for opening and mixing, the short bast fibers and the short palm fibers after the opening and mixing pass through airflows and are arranged through a roller groove to form meshed semi-products with S-shaped section structures, and the meshed semi-products go through spunlace to form non-woven needled bast-palm fiber aerogel core layer materials; (3) sheath layer material processing, that is, a first pulp is prepared from processed tourmalines and ethylene glycol, phthalic acid and glycerol are used for esterification reaction, the first pulp, magnesium oxide and calcium hydroxide are added after the reaction for condensation polymerization, and polyester chip sheath layer materials are obtained through strip casting and sized dicing; (4) composite melt spinning for obtaining of the tourmaline-containing sheath-core composite fibers. The tourmaline-containing sheath-core composite fibers provided by the invention achieve the antibacterial and healthcare effects, high degree of comfort, as well as environment friendliness.

The present invention relates to a production method for high-carbon martensitic stainless steel as used in razorblades, knives and the like, which contains, as percentages by weight, 0.40 to 0.80% carbon and 11 to 16% chromium as main components. Provided is a production method for high-carbon martensitic stainless steel in a strip-casting device, wherein a stainless-steel thin sheet is cast by supplying a stainless molten steel containing, as percentages by weight, 0.40 to 0.80% carbon and from 11 to 16% chromium to a molten steel pool from a tundish via a nozzle, and the cast stainless-steel thin sheet is made into a hot-rolled annealed strip using in-line rollers to a rolling reduction of 5 to 40% immediately just after the casting so that the size of primary carbides within the microstructure of the hot-rolled annealed strip is 10 μm or less, and also provided is martensitic stainless steel produced by means of the production method. By reducing the size of the primary carbides formed in the cast structure and the hot-rolled sheet to 10 μm or less, the present invention produces high-carbon martensitic stainless steel having outstanding blade-end quality for use in cutting implements.

The invention relates to steel made of boron containing microalloy and resisting atmosphere corrosion, and a manufacturing method of the steel. Steel containing boron and resisting atmosphere corrosion is produced through twin-roll thin strip continuous casting, a crystal roll produced through strip casting is sprayed with dry ice, cast strips are uniformly cooled in an strengthened manner, and are cooled below 1,280 DEG C quickly, the cooling rate is 200 to 300 DEG C/s, the strip steel subjected to boronizing is cooled in such a cooling way to promote the separation-out of thick and large BN (Boron Nitride), prevent the occurrence of low-melting-point B2O3 and the separation-out of fine ALN and achieve the purposes of uniforming austenite crystals and reducing the tensile ratio; and then, austenite is subjected to on-line recrystallization rolling, atomoization cooling and coiling. Through the invention, the steel with lower tensile ratio can be manufactured, the problems of steel produced through strip casting that the structure is non-uniform, the tensile ratio is higher, the moulding is difficult, and the requirement of cold rolled material cannot be met are effectively solved, the use requirement of cold rolled base materials is met, and the steel can be directly used in a way of replacing the cold rolling by the hot rolling.

The invention provides a solid-liquid phase metal cast rolling compounding method and device capable of producing a novel metal composite strip through one time continuously by using multi-layer and various metal plates through liquid metal. On the basis of a plate strip cast rolling process, an open feeding nozzle is adopted, a pre-processed multi-layer metal strip penetrates through a cast rolling machine roll gap after soaking in metal melt in the feeding nozzle, the metal strip and the metal melt cooled to be in a semi-solid state and a solid state in a cast rolling area are rolled together, the metal melt is cured and attached to the metal strip, metallurgical bonding of two or more than two types of metal is formed, and the metal composite strip with the preset thickness is produced. The solid-liquid phase metal cast rolling compounding method and device has the advantages of being less in investment, low in production cost and energy consumption, good in product performance and wide in product range. The device comprises an uncoiling unit, a first dragging machine, a second dragging machine, an end shear, a splicer, a washing machine, a drying machine, a third dragging machine, a strip length and tension adjusting device, a cast rolling machine, (a heat preservation heating device, a hot continuous rolling machine), a shearing machine and a coiling machine production line.

The invention belongs to the technical field of a rare earth permanent magnet material, and relates to a high-Ce-content and low-cost rare earth iron-boron permanent magnet and a preparation method therefor. The chemical formula of the permanent magnet is as follows based on mass percentage: (Ce<1-x>RE<x>)(Fe, TM)<100-a-b>B, wherein x is greater than or equal to 0 and less than or equal to 0.20; a is greater than or equal to 28 and less than or equal to 40; b is greater than or equal to 1.21 and less than or equal to 1.50; RE is selected from one or several kinds of rare earth elements of Pr, Nd, Ho, Gd, Y, La or Er; and TM is selected from one or several kinds of Ga, Co, Al, Si, Cu, Nb, Zr, Ti, Mn, Ni, Ag or Su. The preparation method for the rare earth permanent magnet material comprises the steps of preparing raw materials, preparing a strip-casting flake, and carrying out hydrogen crushing, orientation shaping and pressing, sintering and thermal treatment. According to the low-cost rare earth iron-boron permanent magnet, the efficient utilization of the low-cost Ce element can be realized; particularly, the content of Ce accounts for 80-100% of the total rare earth content; a sintered magnet with relatively high coercivity and comprehensive magnetic performance still can be obtained; and in addition, the maximum magnetic energy product (BH)max of the permanent magnet is greater than or equal to 10MGOe, so that the low-cost rare earth iron-boron permanent magnet has the remarkable cost and price advantages.