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  本文關鍵詞： 熱噴涂 自熔性鎳基/不銹鋼混合粉末 爐內(nèi)重熔 低溫性能 裝備　出處：《上海工程技術大學》2016年碩士論文　論文類型：學位論文

【摘要】：液化天然氣作為新能源已經(jīng)被廣泛的應用在居民日常生活中,并且每年的需求量持續(xù)高速增長。液化天然氣容易擴散和泄漏致使其在生產(chǎn)、接收、運輸和氣化過程中對裝置的安全性要求極高。而低溫閥門對其系統(tǒng)的安全可靠運行具有極為重要的作用。由于低溫閥門的工作條件較為苛刻,因此開展材料低溫性能和相關低溫閥門裝備的研究十分必要。本文采用超音速火焰噴涂技術對閥芯材料試樣表面進行加工,分別噴涂自熔性鎳合金粉末涂層和自熔性鎳合金/不銹鋼混合粉末涂層,并選擇部分噴涂后的式樣進行爐內(nèi)重熔工藝的處理,然后對所有的試驗樣品進行低溫沖擊試驗。在低溫沖擊實驗后,對所有的涂層進行涂層微觀組織結構分析、孔隙率的變化分析、涂層XRD物相分析以及硬度梯度測試、涂層粘結強度的測試和摩擦磨損測試。通過上述試驗數(shù)據(jù)的對比得出以下結論:噴涂后采用爐內(nèi)重熔后處理工藝,明顯的降低涂層的孔隙率,提高涂層與基體的粘結強度,同時涂層與基體之間的結合方式也由“機械結合”向“冶金結合”轉(zhuǎn)變,涂層的硬度和耐磨損性也大大的提升了。綜合對比分析,采用超音速火焰噴涂自熔性鎳合金/不銹鋼混合粉末涂層并經(jīng)過爐內(nèi)熔融處理后的涂層綜合性能最優(yōu)。最后,本文針對閥芯表面涂層強化的性能要求,提出了噴涂-激光重熔-滾壓裝置相結合的整體結構設計方案,可以有效提高閥芯表面的涂層性能,同時對低溫閥門的密封結構、檢測機構等裝置的研究給出設計方案�；诔羲倩鹧鎳娡考庸ず蜖t內(nèi)熔融的后處理技術,可有效改善低溫閥門材料的耐磨性和耐低溫性能,減少閥門的檢修頻率,提高閥門的使用性能,并產(chǎn)生良好的經(jīng)濟效益。
[Abstract]:Liquefied natural gas (LNG), as a new energy source, has been widely used in the daily life of residents, and the annual demand continues to increase at a high speed. Liquefied natural gas (LNG) is easy to spread and leak, resulting in its production and reception. In the process of transportation and gasification, the safety requirements of the device are very high, and the cryogenic valve plays an extremely important role in the safe and reliable operation of its system, because of the harsh working conditions of the cryogenic valve. Therefore, it is necessary to study the low temperature performance of the material and the equipment of the relevant cryogenic valve. In this paper, the surface of the spool material sample is processed by supersonic flame spraying technology. Self-fluxing nickel alloy powder coating and self-fluxing nickel alloy / stainless steel mixed powder coating were sprayed respectively. Then all the samples were subjected to low temperature impact test. After the low temperature impact test, the microstructure of all coatings and the change of porosity were analyzed. Phase analysis and hardness gradient test of coating XRD, bond strength test and friction and wear test. Through the comparison of the above test data, the conclusion is as follows: after spraying, the furnace remelting and post-treatment process is adopted. The porosity of the coating is obviously reduced and the bond strength between the coating and the substrate is increased. Meanwhile, the bonding mode between the coating and the substrate is also changed from "mechanical bonding" to "metallurgical bonding". The hardness and wear resistance of the coating are also greatly improved. The comprehensive properties of the self-fluxing nickel alloy / stainless steel mixed powder coating sprayed by supersonic flame spray and treated by melting in furnace are optimal. Finally, the performance requirements of the coating strengthened on the valve core surface are discussed in this paper. The whole structure design scheme combined with spray laser remelting and rolling device is put forward which can effectively improve the coating performance of the valve core and seal the low temperature valve at the same time. Based on the technology of supersonic flame spraying and melting in furnace, the wear resistance and low temperature resistance of low temperature valve materials can be improved effectively. Reduce the frequency of valve maintenance, improve the valve performance, and produce good economic benefits.
【學位授予單位】：上海工程技術大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TG174.4

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