Thermal spraying is not the preparation of brilliant alloy coating

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[summary] introduced domestic and international coating of a few kinds of advanced alloy of brilliant of blame of preparation of thermal spraying technology, point out the coating that be not brilliant is one of heat that thermal spraying domain studies. Besmear with traditional in season layer photograph is compared, coating of the structure that be not brilliant presents a superior performance and good applied prospect in side of wear-resisting, anticorrosive performance. Thermal spraying technology is the very main technique in exterior engineering field, its develop a tendency is: Equipment respect (spray gun) develop to high-energy, high total heat and high rate direction; Data side develops to seriation, standardization, commercial direction, in order to assure muti_function the need of high quality coating; Craft square and develop to direction of mechanization, automation, if juice calculates operation of be hungry control, manipulator,wait. , the research as the material that be not brilliant and development, and all sorts of new-style, high grade thermal spraying (if narrate flame spraying HVOF, Gao Shu high HVAS of electric arc spray and SPS of spray of supersonic speed plasma) ceaseless emerge in large numbers of the technology, be not the thermal spraying that tastes structural coating to making the development way with thermal spraying main technique. Compare with traditional coat photograph, coating of the structure that be not brilliant is in intensity, tenacity, fight the respect such as corrode, wear-resisting, heat barrier and heatproof exhaustion to be able to have marked improvement, and partial coating with with be being had at the same time afore-mentioned a variety of function. The problem of animal sacrifice plinth that Central Africa of thermal spraying technology tastes coating to consider has the interfacial question that the coating that be not brilliant and matrix ask; Blame taste pink to rest material is in the process such as the physics in process of preparation of trends of thermal spraying layer, metallurgy and chemistry; Central Africa of thermal spraying layer tastes the synergism between powdery body material and other data. One, characteristic of function of the alloy that be not brilliant 1. The mechanical function of the alloy that be not brilliant (the structural material with high common tensile strength is like 1) the alloy of magnesium alloy, duralumin, titanium, stainless steel, intensity photograph ratio that exceeds strong steel to wait to taste stuff with new-style blame is not compared apparent. For example, the Al with smaller proportion base and what the crystal material that its intensity is correspondence can obtain alloy of brilliant of Mg radical blame is highest strong 2 ～ 3 times. After the Mg alloy with not high intensity acquires the structure that be not brilliant, its intensity can amount to 1000MPa above. Al radical is not the highest intensity of brilliant alloy to be able to amount to 1200MPa. If can be obtained,on the matrix that be not brilliant dispersion is worn the Fcc of accept rice measure, the structure of Al particle, criterion intensity can be achieved make an appointment with 1550MPa. This kind of high strenth Al radical alloy, make have what compare the new-style and advanced material of intensity high to obtain become a possibility. (The hardness that blame of 2) tall hardness tastes alloy has than relevant crystal data substantially rise, if Fe-B radical is not the diamond pyramid hardness of brilliant alloy,achieve 1200 above. Be not the relation change trend that the hardness that tastes alloy is spent and intensity and Yang model measure to agree basically, so blame brilliant alloy reflected data is hard and strong character truly. (Model of 3) low flexibility measures a model to be not brilliant alloy to have inferior Yang model amount, have better flexibility than corresponding brilliant condition metal. In the meantime, gold of the alloy that be not brilliant has taller stretch percentage elongation and taller flexibility can. In addition, blame brilliant still has high flexural strength, rupture the superior mechanical performance such as tenacity. 2. The other property of the alloy that be not brilliant is not brilliant alloy to have long Cheng not to have foreword structure, but compare without foreword photograph with liquid, it still has the short program with a few orderly short distance to farmland composition. With common much brilliant material is different, blame there can be a broad super-cooling fluid look before tasting alloy to be changed in brilliant of be heated happening area Δ Tx. Area of super-cooling fluid photograph is the alloy place that has chunk to be not brilliant to form ability is peculiar, the blame any crystalline substance that wants alloy only forms ability strong, so no matter it is of chunk, the blame brilliant small band of low still dimension, pink, silk, can have an area of this feign. The young of area of super-cooling fluid photograph is in before making the alloy that be not brilliant produces brilliant to change in be heated, can maintain inside certain temperature limits by " freeze " liquid structure, show a very as similar as oxide glass quality that has certain viscosity, can produce Newtonian flow, namely meet an emergency leads M) of ε of × of =K of σ of sensitive index M=1(. Accordingly, the alloy that be not brilliant also is called sometimes metallic glass, have metallic character already, show the function characteristic of certain oxide glass again. Be not the brilliant alloy agglutinant flow in super-cooling temperature interval, make alloy has capacity of figuration exceeding model. With common of much brilliant material exceed plasticity photograph to compare, the function exceeding model of the alloy that be not brilliant puts in the following advantage: (1) is out of shape temperature is low, of the alloy that be not brilliant exceed model to be out of shape happen in super-cooling temperature area to ask, be in commonly 0. 6T is the following. (The meet an emergency with tall 2) leads E, the alloy that be not brilliant has interval of wider Newton flow, because this can achieve rate of higher meet an emergency. (The outside force that when 3) is out of shape, requires is small, agglutinant flow condition is in when be not brilliant happening plasticity to be out of shape, the deformation force of need is small. (4) is out of shape do not arise in the process empty, average much brilliant data is in happen when exceeding model to be out of shape, grain can produce slippage, roll, perpendicular even move at free surface, empty generation is so inevitable, and it is a kind of more serious flaw, the Newtonian flow condition that and rather than tastes alloy stuff is OK from go up at all eliminate this kind of flaw. (5) is microcosmic and macroscopical go up to happen to be out of shape equably. (Original property still is retained after 6) is out of shape, want to will be out of shape process control is in only the super-cooling temperature interval that produces Newtonian flow, the alloy after refrigeration still maintains to be not brilliant condition, function won't produce change. (7) can have figure very complex be out of shape, of crystal material exceed model to be out of shape the take shape that can have the work with relatively simple appearance only, the figuration of alloy of brilliant of and rather than is unlimited, to the structural member of complex form, what its figuration ability will behave is more outstanding. Blame in tasting alloy phase boundary of photograph of nonexistent crystal boundary, precipitation is mixed a fault position that causes isolated corrosion easily, the composition that the nonexistent also alloy that taste voice appears easily slants analyse, be not brilliant alloy to compare brilliant condition alloy on structure and composition so evener, have taller corrosion resistance consequently can, its corrosion resistance can be 100 times of brilliant state stainless steel. In the meantime, normally the particle of photograph of nonexistent also precipitation obstacle hammer to magnetic domain wall plunges into the alloy that be not brilliant action, have superior soft magnetism performance consequently. 3. Explosive spray is not H of brilliant alloy coating. W. Jin studied explosive spray Fe, Cr, the microcosmic organization that B is alloy coating and wearability. The result makes clear, coating is had fight very well grind and anticorrosive function, coating produces film of surface of the condition that be not brilliant in the trends in slip wear process, make the wearability of coating rises significantly, at the same time coefficient of friction drops significantly. 4. The design thought of coating of alloy of brilliant of blame of preparation of spray of electric arc of coating of alloy of brilliant of blame of electric arc spray is: It is the powder of the alloy that be not brilliant of make choice of core, use material of powdery core silk for spray of cortical preparation electric arc with the metal, spray hind obtains layer of spray of electric arc of the alloy that be not brilliant. A. I. The person such as Brisova uses craft of electric arc spray to be in Fe, rare-earth element is added in B, successful preparation Fe, B, RE is not brilliant coating. Jin Huali of Guo of domestic northeast university used honest legal system of electric arc spray to have two kinds of iron radical are not brilliant coating, coating is microscopical hardness exceeds 1000. Beijing industry university the research that from 20 centuries 80 time begin to devote oneself to thermal spraying material, the hardness of coating of alloy of brilliant of blame of electric arc spray of preparation is tall (> strength of 1000HV) , union is high (> 55MPa) , wearability is good, in wet attrition of oak rubber tyre wears bead its are opposite in the experiment the 7 times above that wearability is coating of 3crl3 of city carry out. Defend in wear-resisting of heating surface of conduit of circular fluid-bed boiler, of all kinds bring the tall wear-resisting such as cover of smoke of converter of fan and impeller of the machine that discharge pink, steelworks and flue to be able to bear or endure corrode defends obtain very good result. Also be coating of brilliant of blame of spray of electric arc of the earliest application at the same time the institute of patent of the material that use silk (" the material of powdery core silk that preparation of electric arc spray contains CrB to be not brilliant coating to use " (patent date: ZL200610089515. The material of powdery core silk that 9) and preparation of electric arc spray contain NiB to be not brilliant coating to use " (patent date: ZL200(is ordered 0089516. 3) invents patent twice to already obtained patent) . 2, the problem that coating of alloy of brilliant of thermal spraying blame exists and its development foreground use preparation of thermal spraying technology to because consider to develop time,be not brilliant alloy coating shorter, coating still cannot achieve design requirement. Content of brilliant of coating Central Africa is very inaccessible 100 ％ , , the coating of preparation sends density poorer, coating function relatively alloy of chunk blame brilliant differs further, tell from this meaning, coating function has not exhibited a space very big still. Current, home is in the research level of this domain and United States to wait for developed country photograph to have bigger difference than returning. Domestic thermal spraying is not the research of brilliant alloy material to still be in an experiment to study level, from already in light of some research results, the coating of the alloy that be not brilliant that uses preparation of thermal spraying technology performance of anticorrosive, wear-resisting is superior, have good applied prospect. At present our country also enhanced the research strength of coating of structure of crystal of rice of the accept that be not brilliant, believe before long in the future, technology of coating of alloy of brilliant of thermal spraying blame will be in construction of our country economy produce main effect. CNC Milling CNC Machining