發(fā)布時間：2018-06-19 15:29

  本文選題：MAX相 + Ti2A��； 參考：《南華大學》2015年碩士論文

【摘要】：機械潤滑材料MAX相氮化物Ti2Al N和Ti4Al N3材料,其晶體結構是由Tin+1Nn片層與Al原子面交替堆垛排列而成,這種層狀結構和獨特的價鍵特性,使其具有較好的自潤滑性能和耐輻照損傷性能,又具備金屬和陶瓷的優(yōu)異性能,因而是潛在的機械潤滑材料和核燃料包殼結構材料。本文首先通過微波燒結法合成了Ti2Al N和Ti4Al N3材料。在微波燒結條件下,制備得到純的帶有取向生長的Ti2Al N,研究了燒結工藝和反應路徑,以及取向生長機理;Ti4Al N3,則研究了在微波燒結條件下燒結工藝和初始原料對最終成相的影響。最后,將制得的純相,再采用放電等離子體法以適當?shù)臒�結工藝分別對Ti2Al N和Ti4Al N3致密化燒結成型。研究了其微觀結構,物理性能,摩擦磨損性能,并嘗試用HF腐蝕Ti2Al N和Ti4Al N3材料;同時對合成的Ti2Al N和Ti4Al N3材料開展了在70 ke V He離子束輻照實驗研究,從微觀結構及模擬方面探究了其輻照損傷結構演變。在室溫測得的Ti2Al N和Ti4Al N3這二種致密化材料的基本物理性能與文獻報道相吻合。Ti2Al N和Ti4Al N3這二種材料在穩(wěn)定磨損階段的摩擦系數(shù)均相近,其摩擦磨損機制類似。在Ti2Al N中沒有取向的表面的耐磨性相對于有取向的表面要好。此外,Ti4Al N3的摩擦磨損性能要優(yōu)于Ti2Al N。研究發(fā)現(xiàn)Ti4Al N3比Ti2Al N相在HF中更為穩(wěn)定,其中Ti4Al N3相有望用來制備二維氮化物片層材料。利用70 ke V He離子對所合成的Ti2Al N和Ti4Al N3材料開展了輻照損傷實驗研究。發(fā)現(xiàn)目前報道的MAX相在輻照條件下的結構轉變機制不能解釋輻照后Ti2Al N和Ti4Al N3的結構轉變。在低劑量下,Ti2Al N和Ti4Al N3基本相似,它們的電子衍射模擬結果與實驗結果均并不相符。在較高劑量下,不同于Ti2Al N的是,Ti4Al N3的微觀結構并沒有發(fā)生明顯的退化,仍然保持了在較低劑量輻照下的微觀結構,并不形成孿晶的FCC結構。
[Abstract]:Mechanical lubricating materials Max phase nitride Ti2AlN and Ti4AlN3, the crystal structure of which is composed of Tin 1Nn lamellar alternating stacking with Al atomic surface, this kind of layered structure and unique valence bond properties. It is a potential mechanical lubricating material and nuclear fuel cladding structure material because it has good self-lubricating property, radiation damage resistance and excellent performance of metal and ceramics. Ti2AlN and Ti4AlN3 materials were synthesized by microwave sintering. Pure Ti 2AL N with orientation growth was prepared under microwave sintering condition. The sintering process, reaction path and orientation growth mechanism of Ti 4AL N 3 were studied. The effects of sintering process and initial raw materials on the final phase formation were studied. Finally, the pure phase was prepared and densified sintering of Ti _ 2AL _ N and Ti _ 4AL _ 3 was formed by using discharge plasma method and appropriate sintering process, respectively, in which Ti _ 2AL _ N and Ti _ 4AL _ 3 were densified respectively. The microstructure, physical properties, friction and wear properties of Ti _ 2AL _ N and Ti _ 4AL _ N _ 3 materials were studied, and the synthesized Ti _ 2AL _ N and Ti _ 4AL _ N _ 3 materials were irradiated by 70ke V he ion beam. The evolution of radiation damage structure was investigated from microstructure and simulation. The physical properties of Ti _ 2AL _ N and Ti _ 4AL _ 3 densified materials measured at room temperature are in agreement with those reported in literature. The friction coefficients of Ti _ 2AL _ N and Ti _ 4AL _ 3 are similar at the stable wear stage, and their friction and wear mechanisms are similar. The wear resistance of non-oriented surfaces in Ti _ 2AL N is better than that of oriented surfaces. In addition, the friction and wear properties of Ti _ 4AL _ N _ 3 are better than that of Ti _ 2AL _ N. It is found that Ti _ 4AL _ 3 is more stable in HF than Ti _ 2AL _ N, among which Ti _ 4AL _ 3 is expected to be used to prepare two-dimensional nitride laminates. The irradiation damage of Ti _ 2AL _ N and Ti _ 4AL _ 3 materials synthesized by 70ke V he ion was studied experimentally. It is found that the structure transition mechanism of MAXphase under irradiation condition can not explain the structural transformation of Ti _ 2AL _ N and Ti _ 4AL _ 3 after irradiation. The electron diffraction simulation results of Ti _ 2AL _ N and Ti _ 4AL _ N _ 3 are not consistent with the experimental results. At higher doses, the microstructure of Ti4AlN3, which is different from Ti2AlN, does not degenerate obviously. It still maintains the microstructure of Ti4AlN3 at lower doses and does not form a twin FCC structure.
【學位授予單位】：南華大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB34

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