CAJ | 학술논문

采用溶胶-凝胶法分别对纳米Al和微米Al进行表面包覆，制备nano-Al/xero-Fe2O3和micro-Al/xero-Fe2O32种复合材料，并对它们的微观结构和物相进行表征。结果表明，纳米Al和微米Al表面均被约20 nm的无定形纳米粒子致密包覆；包覆物中的铁氧比与Fe2O3中的铁氧比大致相当。对2种纳米复合材料以及4种相对应的简单混合物(nano-Al+xero-Fe2O3、nano-Al+micro-Fe2O3、micro-Al+xero-Fe2O3和micro-Al+micro-Fe2O3分别进行DSC分析。对于采用纳米Al作燃料的铝热剂，nano-Al/Xero-Fe2O3、nano-Al+xero-Fe2O3和nano-Al+micro-Fe2O3三者的热谱图没有明显差别；对于采用微米 Al 作燃料的铝热剂，micro-Al/xero-Fe2O3的反应峰温度较 micro-Al+xero-Fe2O3和micro-Al+micro-Fe2O3的分别提高了68.1°C和76.8°C。另外，将4种铝热剂(nano-Al/xero-Fe2O3， nano-Al+micro-Fe2O3，micro-Al/xero-Fe2O3和micro-Al+micro-Fe2O3)同时从室温加热至1020°C，对660°C和1020°C时的产物进行XRD分析。从图谱中共检测出Fe、FeAl2O4、Fe3O4、α-Fe2O3、Al、γ-Fe2O3、Al2.667O4、FeO和α-Al2O3共9种晶体物质。据此推测了可能的反应方程，并以最小自由能原则推出了每种样品最可能的反应过程。
채용용효-응효법분별대납미Al화미미Al진행표면포복，제비nano-Al/xero-Fe2O3화micro-Al/xero-Fe2O32충복합재료，병대타문적미관결구화물상진행표정。결과표명，납미Al화미미Al표면균피약20 nm적무정형납미입자치밀포복；포복물중적철양비여Fe2O3중적철양비대치상당。대2충납미복합재료이급4충상대응적간단혼합물(nano-Al+xero-Fe2O3、nano-Al+micro-Fe2O3、micro-Al+xero-Fe2O3화micro-Al+micro-Fe2O3분별진행DSC분석。대우채용납미Al작연료적려열제，nano-Al/Xero-Fe2O3、nano-Al+xero-Fe2O3화nano-Al+micro-Fe2O3삼자적열보도몰유명현차별；대우채용미미 Al 작연료적려열제，micro-Al/xero-Fe2O3적반응봉온도교 micro-Al+xero-Fe2O3화micro-Al+micro-Fe2O3적분별제고료68.1°C화76.8°C。령외，장4충려열제(nano-Al/xero-Fe2O3， nano-Al+micro-Fe2O3，micro-Al/xero-Fe2O3화micro-Al+micro-Fe2O3)동시종실온가열지1020°C，대660°C화1020°C시적산물진행XRD분석。종도보중공검측출Fe、FeAl2O4、Fe3O4、α-Fe2O3、Al、γ-Fe2O3、Al2.667O4、FeO화α-Al2O3공9충정체물질。거차추측료가능적반응방정，병이최소자유능원칙추출료매충양품최가능적반응과정。
Sol-gel method was employed to combine Al and iron-oxide to form nanocomposites (nano-Al/xero-Fe2O3 and micro-Al/xero-Fe2O3). SEM, EDS and XRD analyses were used to characterize the nanocomposites and the results indicated that nano-Al and micro-Al were compactly wrapped by amorphous iron-oxide nanoparticles (about 20 nm), respectively. The iron-oxide showed the mass ratio of Fe to O as similar as that in Fe2O3. Thermal analyses were performed on two nanocomposites, and four simple mixtures (nano-Al+xero-Fe2O3, nano-Al+micro-Fe2O3, micro-Al+xero-Fe2O3, and micro-Al+micro-Fe2O3) were also analyzed. There were not apparent distinctions in the reactions of thermites fueled by nano-Al. For thermites fueled by micro-Al, the DSC peak temperatures of micro-Al/Xero-Fe2O3 were advanced by 68.1 °C and 76.8 °C compared with micro-Al+xero-Fe2O3 and micro-Al+micro-Fe2O3, respectively. Four thermites, namely, nano-Al/xero-Fe2O3, nano-Al+micro-Fe2O3, micro-Al/xero-Fe2O3, and micro-Al+micro-Fe2O3, were heated from ambient temperature to 1020 °C, during which the products at 660 °C and 1020 °C were collected and analyzed by XRD. Crystals of Fe, FeAl2O4, Fe3O4,α-Fe2O3, Al,γ-Fe2O3, Al2.667O4, FeO andα-Al2O3 were indexed in XRD patterns. For each thermite, according to the specific products, the possible equations were given. Based on the principle of the minimum free energy, the most reasonable equations were inferred from the possible reactions.