Thermal Spray coatings
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Currently High Velocity Oxy-fuel (HVOF) for hot spray is used in many industrial applications. HVOF coating techniques, processes, maps and applications are considered. The HVOF spraying mix is combined with other cover components. HVOF spraying is a combination of deposits for metal materials, metal systems and ceramic nanostructure powder. In coating generation, improvements in temperature and velocities because of preface of oxy-fuel dissolving in feedstock powder. To control the coating process, method and tool are described. Assembling the microstructure from the beginning of the splats until the construction of the final joint identified the microstructure. Coordinating and performing HVOF coating work is described.
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High-velocity combustion or oxyfuel spraying started up more than 35 years ago with the development of the detonation gun or D-Gun process. Described as the newest and fastest growing member of the family of coating, or surfacing, technologies known collectively as thermal spray'', HVOF processes have carved out a significant, specialized niche in the thermal spray coating business, particularly for the deposition of wear-resistant carbide coatings. HVOF processes are able to deposit very dense coatings, typically with reduced changes in the phase composition of the material, compared with plasma arc spray processes. HVOF also offers a number of potential advantages over, and alternatives to, competing processes, including lower capital costs, portability, and ease of use in the field.
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Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering
Porous SiC ceramics with multiple pore structures were fabricated via gelcasting and solid state sintering.A novel gelling agent of Isobam was applied and PMMA was used as both foam stabilizer and pore forming agent.The mechanical properties of porous SiC ceramics were investigated as functions of PMMA content, rotating speed of ball mill, and sintering temperature.With PMMA content increasing from 5wt% to 20wt%, the foaming effect was inhibited while the stability of bubbles increased.When the rotating speed was 220 r/min, the open porosities of the as-prepared SiC ceramics sintered at 2100 varied ℃ from 51.5% to 72.8%, and compressive strength varied from 7.9 to 48.2 MPa.With the rotating speed increasing from 220 to 280 r/min, the foaming effect was aggravated and the porosities of SiC ceramics sintered at 2100 increased.℃ While the sintering temperature increasing from 2050 to 2150 , ℃ the SiC ceramics prepared with PMMA content of 20wt% at rotating speed of 220 r/min decreased in the open porosities while increased in compressive strength.
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Diffractometer
Piston (optics)
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High-velocity oxy–fuel (HVOF) thermal spraying was developed in 1930 and has been commercially available for twenty-five years. HVOF thermal spraying has several benefits over the more conventional plasma spray technique including a faster deposition rate which leads to quicker turn-around, with more durable coatings and higher bond strength, hardness and wear resistance due to a homogeneous distribution of the sprayed particles. HVOF thermal spraying is frequently used in engineering to deposit cermets, metallic alloys, composites and polymers, to enhance product life and performance. HVOF thermal spraying system is a highly promising technique for applying durable coatings on structural materials for corrosive and high temperature environments in advanced ultra-supercritical coal-fired (AUSC) boilers, steam turbines and gas turbines. HVOF thermal spraying is the preferred method for producing coating with low porosity and high adhesion. HVOF thermal spray process has demonstrated to be one of the most efficient techniques to deposit high performance coatings at moderate cost. This publication is devoted to shed light on the design aspects and test equipment requirements for liquid fuelled HVOF thermal spray gun. The current research provides extensive understanding of several key process parameters to develop design tools for the next generation liquid fuelled HVOF thermal spray system for high temperature and harsh environment applications.
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Abstract Three thermal spray methods often used in industry are flame spray, plasma spray, and high-velocity oxyfuel (HVOF) spray. This research is intended to compare the properties of those methods in depositing Stellite coating on 410 martensitic stainless steel. The results showed that both plasma spray and HVOF coating show an even deposition, which could not be achieved by a flame spray method. Those three coatings meet manufacture minimum bond strength requirements. The highest bond strength and hardness were provided by the HVOF process with a value of 33.1 MPa and 719 HV, respectively. According to bond strength and standard hardness deviation, the HVOF process gives the most homogeneous coating. Substrate hardness just below the coating interface after flame spray, plasma spray, and HVOF process are raised by 236%, 56%, and 65% each from the specification. HVOF coating has the best cross section compared to others. Smallest porosity percentage, porosity size, and average interface unbonding is got by the HVOF process, with a value of 0.2%, 7.2 um, and 31%, respectively. Coating microstructure after etching shows phases related to heat input during application. The dendritic structure is observed on flame spray and plasma spray coating after etching but not on HVOF coating. Oxides and carbides of both cobalt and chrome are formed in the coating.
Stellite
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Бұл зерттеужұмысындaКaно моделітурaлы жәнеоғaн қaтыстытолықмәліметберілгенжәнеуниверситетстуденттерінебaғыттaлғaн қолдaнбaлы (кейстік)зерттеужүргізілген.АхметЯссaуи университетініңстуденттеріүшін Кaно моделіқолдaнылғaн, олaрдың жоғaры білімберусaпaсынa қоятынмaңыздытaлaптaры, яғнисaпaлық қaжеттіліктері,олaрдың мaңыздылығытурaлы жәнесaпaлық қaжеттіліктерінеқaтыстыөз университетінқaлaй бaғaлaйтындығытурaлы сұрaқтaр қойылғaн. Осы зерттеудіңмaқсaты АхметЯсaуи университетіндетуризмменеджментіжәнеқaржы бaкaлaвриaт бaғдaрлaмaлaрыныңсaпaсынa қaтыстыстуденттердіңқaжеттіліктерінaнықтaу, студенттердіңқaнaғaттaну, қaнaғaттaнбaу дәрежелерінбелгілеу,білімберусaпaсын aнықтaу мен жетілдіружолдaрын тaлдaу болыптaбылaды. Осы мaқсaтқaжетуүшін, ең aлдыменКaно сaуaлнaмaсы түзіліп,116 студенткеқолдaнылдыжәнебілімберугежәнеоның сaпaсынa қaтыстыстуденттердіңтaлaптaры мен қaжеттіліктерітоптықжұмыстaрaрқылыaнықтaлды. Екіншіден,бұл aнықтaлғaн тaлaптaр мен қaжеттіліктерКaно бaғaлaу кестесіменжіктелді.Осылaйшa, сaпa тaлaптaры төрт сaнaтқa бөлінді:болуытиіс, бір өлшемді,тaртымдыжәнебейтaрaп.Соңындa,қaнaғaттaну мен қaнaғaттaнбaудың мәндеріесептелдіжәнестуденттердіңқaнaғaттaну мен қaнaғaттaнбaу деңгейлерінжоғaрылaту мен төмендетудеосытaлaптaр мен қaжеттіліктердіңрөліaйқын aнықтaлды.Түйінсөздер:сaпa, сaпaлық қaжеттіліктер,білімберусaпaсы, Кaно моделі.
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Abstract The technology of high‐velocity oxygen fuel (HVOF) thermal spraying is today one of the more important processes used to apply carbide based coatings. HVOF spraying has been transforming from gas‐fuelled towards liquid‐fuelled systems. An apparent benefit from this development is to use low‐cost fuels such as kerosene. In this work a WC‐CoCr powder was thermally sprayed by three different variants of the high velocity oxy‐fuel process, in which the fuels were hydrogen and kerosene. This study was carried out in order to evaluate the influence of HVOF spray parameters on some coating properties. Investigations into the microstructural evolution of the coatings, using scanning electron microscopy and X‐ray diffraction, are presented along with results on their mechanical and tribological properties.
Kerosene
Cermet
Tungsten Carbide
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