本文選題：鈦基復(fù)合材料 + TiC　； 參考：《南昌航空大學(xué)》2017年碩士論文

【摘要】：鈦基復(fù)合材料因具有優(yōu)異的室溫和高溫力學(xué)性能等,被廣泛應(yīng)用于航空、航天及民用等多個(gè)工業(yè)領(lǐng)域。為了進(jìn)一步研究不同增強(qiáng)相對(duì)鈦基復(fù)合材料組織和性能的影響,并進(jìn)一步改善其表面性能,本文采用粉末冶金結(jié)合微波燒結(jié)技術(shù)制備了TiC/Ti6Al4V和石墨烯/Ti6Al4V復(fù)合材料。研究了微波燒結(jié)溫度、TiC含量對(duì)TiC/Ti6Al4V組織與力學(xué)性能、耐磨性和抗氧化性的影響,同時(shí)采用微弧氧化表面改性技術(shù),進(jìn)一步提高了TiC/Ti6Al4V復(fù)合材料的耐磨性和抗氧化性,分析了電解液組分和TiC含量對(duì)微弧氧化膜層的顯微結(jié)構(gòu)和性能的影響。最后研究了石墨烯作為新型增強(qiáng)相對(duì)鈦基復(fù)合材料組織和性能的影響以及存在的一些問(wèn)題。研究結(jié)果表明,微波燒結(jié)制備的TiC/Ti6Al4V復(fù)合材料由基體ɑ-Ti+β-Ti和TiC相組成,基體(ɑ-Ti+β-Ti)兩相為等軸組織結(jié)構(gòu),TiC相內(nèi)部處于缺C狀態(tài)。隨著燒結(jié)溫度或者TiC含量的增加,TiC/Ti6Al4V復(fù)合材料的致密度、基體硬度、室溫壓縮強(qiáng)度均提高,得到最佳燒結(jié)工藝為燒結(jié)溫度1200℃和TiC含量為15wt.%時(shí),分別達(dá)到98.01%、661HV0.1、1789MPa。在摩擦副為GCr15或Zr O2時(shí),復(fù)合材料的體積磨損率較基體均有不同程度的減小。隨著氧化溫度的增加,TiC/Ti6Al4V復(fù)合材料的氧化規(guī)律由拋物線型轉(zhuǎn)變?yōu)橹本�型,增加復(fù)合材料中TiC含量可以增大氧化激活能,減小氧化物粒徑,TiC/Ti6Al4V復(fù)合材料的抗氧化性能也越好。采用NaH2PO2+Na2SiO3電解液,可以在TiC/Ti6Al4V復(fù)合材料表面制備出主要由銳鈦礦TiO2相組成的微弧氧化膜層,其耐磨性較好、腐蝕電流密度較復(fù)合材料基體低2個(gè)數(shù)量級(jí)。TiC/Ti6Al4V復(fù)合材料表面微弧氧化膜可以進(jìn)一步提高復(fù)合材料高溫抗氧化性能,但是隨著TiC含量的增加,TiC/Ti6Al4V復(fù)合材料表面的微弧氧化膜層在高溫下剝落較快。石墨烯作為增強(qiáng)相時(shí),隨著燒結(jié)溫度的升高,石墨烯易與Ti界面反應(yīng)產(chǎn)生細(xì)小的TiC顆粒,石墨烯/Ti6Al4V復(fù)合材料的致密度和顯微硬度均增加。石墨烯表面鍍銅處理,使得界面處的TiC含量反而增多,同時(shí)引入了Ti2Cu相,微量銅可以降低燒結(jié)溫度,提高了石墨烯/Ti6Al4V復(fù)合材料的力學(xué)性能。
[Abstract]:Because of its excellent mechanical properties at room temperature and high temperature, titanium matrix composites have been widely used in many industrial fields such as aviation, aerospace and civil. In order to further study the effect of different reinforcement on the microstructure and properties of titanium matrix composites and further improve their surface properties, TiC/Ti6Al4V and graphene / Ti _ 6Al _ 4V composites were prepared by powder metallurgy and microwave sintering. The effects of tic content of microwave sintering temperature on the microstructure, mechanical properties, wear resistance and oxidation resistance of TiC/Ti6Al4V were studied. Meanwhile, the wear resistance and oxidation resistance of TiC/Ti6Al4V composites were further improved by micro-arc oxidation surface modification technology. The effects of electrolyte composition and TiC content on the microstructure and properties of the microarc oxide film were analyzed. Finally, the effect of graphene as a new reinforced titanium matrix composite on microstructure and properties and some problems were studied. The results show that the TiC/Ti6Al4V composites prepared by microwave sintering are composed of matrix Ti 尾 -Ti and TiC phase, and the matrix (Ti 尾 -Ti) two phases are equiaxed structure and the tic phase is in the state of lacking C. With the increase of sintering temperature or TiC content, the density, matrix hardness and room temperature compression strength of TiC- / Ti6Al4V composites are increased. The results show that the optimum sintering process is that the sintering temperature is 1200 鈩，

本文編號(hào)：1855660