不同摻雜濃度對al2o3cr光電特性的影響畢業(yè)設(shè)計-全文預(yù)覽

　　

【正文】 ree samples show that upconversion luminescence properties. The higher Cr3+ doped concentration, the lower fluorescence emission intensity. In the excitation wavelength 400 ~ 500nm range, % sample has five emission peaks. There are the most strong emission peaks of both % and % at 691nm. Two emission peaks of the % sample are, respectively, 356nm and 709nm, in excitation wavelength range 220 ~ 320nm. Increasing the concentration of Cr3+ in Al2O3 can reduce the sintering temperature. Sintered density of samples increased with the concentration is not monotonously increasing, however, there is a minimum among three doping concentrations. With doping concentration increasing, the impact of spacing is almost unchanged. With the doping concentration increasing, the average resistivity of the samples is showing downward trends. So far found the ceramic made of alumina has many excellent performances, alumina ceramics gradually bee a hotspot.Key words: Al2O3 ceramic。 Optical properties目 錄論文總頁數(shù)：19 頁1 引言 ..............................................................................................................................................12 氧化鋁陶瓷 ..................................................................................................................................1 氧化鋁晶體結(jié)構(gòu) ...................................................................................................................2 氧化鋁的物理性能 ...............................................................................................................2 氧化鋁陶瓷中添加劑的作用及機理 ...................................................................................23 氧化鋁陶瓷的制備工藝過程 ......................................................................................................3 原料及其加工工藝 ...............................................................................................................3 配料計算 ...............................................................................................................................3 備料工藝 ...............................................................................................................................3 原料的煅燒 ....................................................................................................................3 熔塊合成 ........................................................................................................................4 粉料的制備 ....................................................................................................................4 漿料壓濾、困料 ............................................................................................................5 干燥、加黏合劑和造粒 ................................................................................................5 成型 .......................................................................................................................................6 排膠 .......................................................................................................................................7 燒結(jié) .......................................................................................................................................7 升溫階段 ........................................................................................................................8 保溫階段 ........................................................................................................................8 冷卻階段 ........................................................................................................................84 樣品的制備 ..................................................................................................................................8 實驗設(shè)備 ...............................................................................................................................8 摻鉻氧化鋁陶瓷的制備 .......................................................................................................95 實驗結(jié)果與分析 ........................................................................................................................10 發(fā)射光譜與激發(fā)光譜 .........................................................................................................10 燒結(jié)后每組樣品的發(fā)射光譜和激發(fā)光譜 ..................................................................10 不同濃度樣品的發(fā)射光譜與分析 ..............................................................................12 X 射線衍射分析 ..................................................................................................................13 晶胞參數(shù)的計算與分析 ..............................................................................................14 晶面間距的分析 ..........................................................................................................15 四探針測試樣品電阻率 .....................................................................................................16結(jié) 論 ..........................................................................................................................................16參考文獻 ..........................................................................................................................................17致 謝 ........................................................................