中文题名: | 新型多孔陶瓷-金属复合材料及其三明治结构的制备和性能研究(博士后研究工作报告) |
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学科代码: | 070205 |
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学生类型: | 博士后 |
学位: | 理学博士 |
学位年度: | 2014 |
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研究方向: | 新型轻质复合材料开发 |
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提交日期: | 2014-07-10 |
答辩日期: | 2014-07-09 |
外文题名: | THE MANUFACTURE METHOD AND PROPERTIES STUDY OF A NEW POROUS CERAMIC-METAL COMPOSITE MATERIAL AND ITS SANDWICH STRUCTURE |
中文摘要: |
本课题主要目的是研究新型多孔铝合金复合材料的制造方法和以多孔铝合金复合材料为芯材的三明治结构夹板的力学性能以及热学性能。文中利用天然沸石粉末作为主要原料,加入一定量的辅料和添加剂,通过烧结过程制备低密度的空心陶瓷球。通过添加球料法和粉末烧结法结合的方法,在真空炉内烧结制造出了陶瓷铝合金复合多孔材料。通过铝合金和自制空心陶瓷球的比较,基于铝合金组分本身的性能,选用6061合金和空心陶瓷球制备芯体材料。6061合金的主要合金元素镁与硅形成主要强化相Mg2Si,其可使合金有人工时效硬化的功能。沸石基陶瓷有丰富的结晶水,在烧结过程中会产生大量气泡,导致体积膨胀,降低密度。选用304不锈钢面板与芯材结合。并通过加热曲线的调整,获得芯材与面板结合良好的三明治结构板材。实验证明,改良后的三明治板材芯体与面板结合力优良,在芯体破坏之后,结合部保持完好。 通过压缩、拉伸、三点弯曲和疲劳测试的研究,确定了芯体和三明治材料的力学性能,结果显示陶瓷铝合金复合芯体的力学性能不同于传统的泡沫金属材料,拥有泡沫金属和复合材料各自的特征,三明治结构的芯体板面结合牢固,力学性能有极大提升,适合应用于工业领域。热学测试显示,复合材料的热导率由于加入了隔热陶瓷材料,比多孔铝合金材料有大幅下降,适用于低导热率的应用领域。
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外文摘要: |
Purpose of this subject is to study a new manufacturing method of porous aluminum alloy composite materials, and to study the mechanical and thermal properties of the sandwich structure with porous aluminum alloy composite material as core material.Natural zeolite powder was used as a primary one of raw materials in the sintering process to produce a kind of porous ceramic ball with low density in this paper. Adding ball method and powder sintering method were used to manufacture the ceramic & aluminum alloy composite porous materials in a vacuum furnace. By the properties of aluminum alloy and the hollow ceramic ball, based on the performance of the aluminum alloy, 6061 aluminum alloy and zeolite-based ceramic were chosen to generate the core materials of sandwich structure. Magnesium and silicon in the main elements of 6061 aluminum alloy form the main strengthening phase Mg2Si, which can make the alloy have the function of artificial aging hardening. Zeolite-based ceramics has crystallization water inside, which produces a large number of bubbles in the sintering process. It causes the volume expansion and lower density of the ceramic product. Core material and 304 stainless steel panel were sintered together then. By the adjustment of the heating curve, get the best sandwich structure combined with core material and steel panel. Experiment results show that modified sandwich structure with the panel binding force is very strong, and integration between the core material and steel panel is intact when the core material was destructed in the test process.Through the compression, tensile, and three point bending and fatigue test, determine the mechanical properties of core body and sandwich structure. The results show that the mechanical properties of the ceramic aluminum alloy is different from the traditional foam metal materials. The ceramic aluminum alloy has respective characteristics of metal foam and composite materials. The core board face combined of sandwich structure has great improvement in mechanical properties, and is suitable for applications in industrial fields. Thermal test showed that the thermal conductivity of the composite has a sharp decline due to join the insulating ceramics. Porous ceramic aluminum alloy material is suitable for the applications of low thermal conductivity.
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参考文献总数: | 169 |
作者简介: | 卢淼,英国利物浦大学工程学院材料专业博士,研究多孔金属材料。 |
馆藏地: | 图书馆学位论文阅览区(主馆南区三层BC区) |
馆藏号: | 博070205/1410 |
开放日期: | 2014-07-10 |