The thermal spraying technology in reproducing project (go up)

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Summary: Reproducing is the industrialization that high-tech of useless old product maintains. Reproducing is different from maintenance already, also be different from recycle. Thermal spraying technology is one of crucial technologies propping up of reproducing. The article studied from foundation and the angle that use a base the compound between metal of spray of high speed electric arc is high temperature resistant alumina of erosive coating, aluminium radical is added rub coating, Zn-Al-Mg-RE is able to bear or endure seawater corrodes coating, reach 12Co-WC of spray of plasma of tall usefulness supersonic speed to be able to bear or endure arenaceous bead wears away coating of coating, wear-resisting of structure of Al2O3/TiO2 accept rice. The result makes clear, the coating of preparation of thermal spraying technology, OK and contented reproducing to wear-resisting, be able to bear or endure all sorts of requirements such as corrode. Keyword: Erosion-corrosion of spray of plasma of supersonic speed of spray of electric arc of reproducing project high speed the connotation reproducing project of 1 reproducing project is with the product whole life cycle is guidance theoretically, with abandoning old product implementation to span type development is a target, it is criterion with material of high grade, efficient, energy-saving, section, environmental protection, it is a method with advanced technique and industrialization production, come the floorboard of a series of repair, technology measure that transform useless old product or project activity. The research target of equipment reproducing project -- " product " be broad sense. It can be equipment, system, establishment already, also can be its component; Include hardware already, also include software. In a word, reproducing project is the industrialization that hi-tech of useless old product maintains. Product from argumentation, design, make, use, maintenance, till discard as useless,the total cost of an expenditure calls charge of whole life cycle. Traditional idea often pays attention to 20%-30 of periodic to Zhan Quanshou life charge the half a lifetime before the product of ％ (argumentation, design, production phase) devoted, and ignored 70%-80 of periodic to Zhan Quanshou life charge however the product second half of ％ is unripe (use, maintenance, discard as useless level) devoted. Reproducing project is research target with the half a lifetime after the product namely, the promotion, function that transforms useless old product, make abandon vitality of old product recovery. The main feature of reproducing is reproducing product measure and taste newly more than character, 50% what cost just tastes newly however, energy-saving 60% , section material 70% , the bad influence to the environment and make taste photograph comparing newly to be reduced significantly. Reproducing is different from equipment to maintain already, be different from equipment recycle again (reclaim use) . Maintenance is the technical step that takes to make its carry good state in the use phase of the product, often have random sex, former a sex, lash-up sex. And reproducing is will many useless old product after disassembling, the type that presses component undertakes detecting, it is semifinished product in order to have the component of reproducing value, use advanced surface technology and other new and high technology undertakes to its batch changes repair, function to upgrade, acquires reproducing product can be achieved on specifications taste newly more than even. Recycle (reclaim use) it is to carry the treatment kind such as melt down smelt, get the raw material of low grade, and more the sources of energy should be wasted in reclaiming, have bigger effect to the environment. Reproducing is in order to abandon old shape component is resource, through new and high technology treatment acquires the product of high quality, high additional cost, the sources of energy that waste is little, utmost ground looked for useless old component in accumulate contained additional cost, its produce cost to want far under taste newly. The need of applied reproducing project in reproducing project has specific crucial technology to regard as prop up. Advanced exterior project, and technology of project of accept rice surface is one of crucial techniques with reproducing the mainest project. Thermal spraying technology is (accept rice) the important composition technology of exterior project. Its essence is to will wait for gush material to heat to melt or half fused condition, issue fast eject to bear down on in action of gas of high speed pressure next matrix, be out of shape via colliding finally and accumulation figuration. Thermal spraying method has a variety of, among them spray of high speed electric arc and application of spray of supersonic speed plasma are wider. It is OK to use method of spray of supersonic speed plasma coating of structure of preparation cashier rice. 2.

Coating of the compound between metal of spray of electric arc of 1 high speed is high temperature resistant corrode, erosive research is large the working environment of conduit of wall of utility boiler water-cooling is very harsh, heat is corroded very serious. The fuel of boiler is coal, the impurity such as S, K, Na, V is contained in coal, SO2, SO3, H2S, V2O5 is formed to wait when combustion, deposit frit salt is formed in conduit surface with the reaction such as the O2 in air, NaCl, quicken material thereby corrode destroy. Through alloy of tall to conduit wall spray Ni-Cr coating can prevent heat effectively to corrode, but this method cost is higher, popularize not easily. The corrosion resistance in coating of structure of the compound between Fe-Al metal oxidizes with its are fought admirably and fighting a variety of vulcanization function, medium can, higher high temperature intensity, low density, especially the characteristic such as low cost, can use extensively at reducing heat to corrode to destroy. But, low plasticity mixes the room temperature of the compound between Fe-Al metal to rupture lowly fought force to worsen its figuration technical properties, restricted its project application greatly. To overcome the technology weakness of difficulty of figuration of the compound between Fe-Al metal, employ spray of high speed electric arc and capable person of powdery core silk (aluminium of iron portfolio iron mixes powder) the material preparation that is united in wedlock and figuration unifinication technology, successful in the lab preparation the compound between Fe-Al metal reachs his compound coating (Fe-Al, Fe-Al/WC, Fe-Al/Cr3C2) . The result makes clear, the compound between Fe-Al metal reachs his compound coating has admirable heat-resisting to corrode with erosive abrasiveness can. The compound between Fe-Al metal is called " the poor's stainless steel " . Graph 1(a) , (the sectional form appearance that B) is compound coating of Fe-Al/WC of spray of high speed electric arc, Fe-Al/Cr3C2 respectively, seeing compound coating and matrix is good mechanical table, there still is certain metallurgy to be united in wedlock in the meantime, combinative strength is accordingly higher. Graph 2(a) , (B) is the TEM analysis that area differs in compound to Fe-Al/WC coating respectively. Because cooling rate is different, the compressed grain of coating is in-house with inferior microcrystalline and microcrystalline give priority to, in structure of crystal of rice of local district occurrence accept, at the same time discovery is put in photographs of a few the condition that be not brilliant; Wrong density of the place inside grain is higher. Compressed grain exceeds coating of graph 1 Fe-Al and Fe-Al/WC coating in-housely compressed grain exceeds coating of 2 Fe-Al of graph of fine organization Normal Align=center> and Fe-Al/WC coating in-housely fine organization pursues the 3 tribology property that to be opposite in operating condition of the imitate in the lab compound coating of Fe-Al/WC of spray of high speed electric arc, Fe-Al/Cr3C2 has experiment. Graph 3(a) is the wear rate curve that compound coating leaves in different temperature. Can see, no matter the wear rate of Fe-Al/WC compound coating is in below room temperature or high temperature, wear rate all lowest, show this coating has performance of superior wear-resisting of tall, low temperature. The heat that graph 3(b) issues in 650 ℃ for Fe-Al/Cr3C2 compound coating corrodes experimental result, it is thus clear that its heat-resisting corrodes function apparent excel matrix, fall in high temperature condition especially. The compound between metal of Fe-Al of spray of high speed electric arc reachs his compound coating (Fe-Al/WC, Fe-Al/Cr3C2) , also can be oxidized below high temperature condition, but in combustion process, al atom diffuses to coating surface form division of Al element rich market, make the Al2O3 film of protection with O reaction, prevented the farther combustion of coating, protected matrix to avoid be heated to corrode so destroy. The compound between the Fe-Al metal of preparation of spray of electric arc of caustic curve high speed reachs the wearability of 3 Fe-Al/WC of Normal Align=center> graph, Fe-Al/Cr3C2 compound coating and heat-resisting its are compound the wall outside vent-pipe of engine of car of the heating surface that coating already used pipeline of boiler of Yu Haijun naval ships gradually and tank, armor. Normal >2.

Aluminium radical alumina adds spray of 2 high speed electric arc rub of board of shipowner of coating research naval vessel preventing slippery processing is one of difficult problem that puzzle us all the time. A lot of steel structure on ship vessel reach a part, of equipment of board of the layer that be like a top, equipment carrying board of corridor of activity of area, personnel, helicopter is the place such as picket, slippery to preventing surface has very tall need, coefficient of friction asks to be in 0.

6 above. The safety of carrier-borne helicopter and personnel basically depends on between helicopter tire and aircraft parking area and personnel sole and board enough attrition power. The defends slippery surface coating to be a tradition polymer coating system that uses now, namely polymer and the organic and compound coating that large size corundum comprises. Corundum granuality is 0.

45 ～ 0.

9mm, coating ply 1.

5mm. But easy ageing of this kind of organic coating, life is brief, the combinative strength of corundum and polymer coating is low, in use process easy fall off, wearability is poor, consequently the maintenance of coefficient of friction ability is poor. In addition polymer coating can cause environmental pollution. Research center of engineering of equipment maintenance surface uses spray of high speed electric arc the method of material of silk of core of aluminium radical pink solved this one difficult problem effectively. Above all preparation material of silk of core of pink of Al radical Al2O3, preparation sketch map sees a picture 4. Cortical for Al, powdery core is grain of Al2O3 pottery and porcelain. Lead the low, issue that combines intensity difference with aluminous matrix to solve deposit of grain of Al2O3 pottery and porcelain, fu is wrapped in Al2O3 grain surface one layer exceeds fine aluminium powder, because melting point is low,fine aluminium powder exceeds when such spray and fuse above all, improved Al2O3 grain not only heat the effect, and those who form is intermittent aluminous film can increase the combinative strength with aluminous matrix substantially. Graph this plants diagram of signal of technology of production of timber of silk of 4 pink core new-style prevent slippery coating to be in hunt submarine advocate undertook applied actually on board. When exercise, go up in matrix above all spray anti-corrosive aluminium coating, use at preventing seawater to corrode armor plate, continue next Al2O3 of an Al radical prevents spray slippery coating, use attenuant board lacquer to undertake sealing of hole is handled finally, see a picture 5. Actual application makes clear, the action of grain of Al2O3 of this compound coating support and have prevent slippery effect goodly, have good anticorrosive performance again at the same time. Already became ship vessel to prevent the significant step of slippery processing at present. Graph 5 compound defend slippery coating system CNC Milling CNC Machining