摘要运用放热弥散法反应合成了Al-TiO2-B-Cu、Al-Ti-B2O3-Cu系铜基复合材料。探索其制备工艺，分析反应过程的热力学，并结合DSC、金相照片与XRD图谱建立了反应过程动力学模型。利用金相显微镜、SEM和XRD等手段分析反应产物微观组织。研究发现Al-TiO2-B-Cu体系反应过程中，液态Al首先和TiO2发生反应，生成热力学稳定的-Al2O3和活性Ti原子，活性Ti原子又与B结合产生TiB2；在 Al-Ti-B2O3-Cu体系的反应过程中， 液态Al首先和Ti发生反应，生成Al3Ti，Al3Ti再与B2O3结合产生增强相TiB2和-Al2O3。两个反应体系的最终反应产物均是-Al2O3和TiB2。当B/TiO2=0时，增强相为30%的Al-TiO2-B-Cu系反应产物为-Al2O3。当B/TiO2=1时，出现了增强相TiB2。当B/TiO2=2时，-Al2O3、TiB2增强相均匀分布于基体中；当B2O3/Ti=0时，增强相为30%的Al-Ti-B2O3-Cu体系的增强相只有Al3Ti。当B2O3/Ti=1/2时出现了-Al2O3相。当B/TiO2=2时，-Al2O3、TiB2增强相均匀分布于基体中。64028

毕业论文关键词 放热弥散法 铜基复合材料 合成机理 差热扫描热分析

毕业设计说明书（论文）外文摘要

Title  Study on Copper Matrix Composites Formed by XD Technology in Al-TiO2-B-Cu and Al-Ti-B2O3-Cu Systems

Abstract In this article,the Al-TiO2-B-Cu and Al-Ti-B2O3-Cu systems copper matrix Composites were successfully fabricated by means of the exothermic dispersion(XD).Its preparation technology was explored，thermodynamic of reaction process was analysed ，and the reaction process dynamics model was founded combining with DSC、X-ray diffraction（XRD） and optical mierosepoe（OM）.The microstructures of composites were analysed by optical mierosepoe（OM），scanning electron microscopy（SEM）and X-ray diffraction（XRD）.The results indicated that in the Al-TiO2-B-Cu system, liquid aluminum reacted with TiO2 firstly and resulted in stabilized -Al2O3 grains and active Ti atoms,then the active Ti atoms reacted with B grains to form TiB2.In the Al-Ti-B2O3-Cu system, liquid aluminum reacted with Ti grains firstly and resulted in Al3Ti , then the Al3Ti grains reacted with B2O3 grains to form TiB2 and -Al2O3 grains.The reacted products of the two Systems were TiB2  and -Al2O3 grains.When reinforcement volume fraction was 30%，B/TiO2 molar ratio was 0,the reinforcement of the Al-TiO2-B-Cu system was -Al2O3.When B/TiO2 molar ratio was 1，the reacted products appeared TiB2  . When B/TiO2 molar ratio was 2，the TiB2  and -Al2O3 reinforcement uniformly distributed in the matrix. When reinforcement volume fraction was 30%，B2O3/Ti molar ratio was o,the reinforcement of the Al-Ti-B2O3-Cu system was Al3Ti.When B2O3/Ti molar ratio was 1/2，the reacted products appeared -Al2O3. When B2O3/Ti molar ratio was 1，the TiB2  and -Al2O3 reinforcement uniformly distributed in the matrix.

Keywords  Exothermic Dispersion Reaction  Copper Matrix Composites  Synthetic mechanism  Differential Scanning Calorimetry

1 引言1

1.1 原位合成铜基复合材料1

1.2 本课题的研究目的和主要内容5

2 实验部分6

2.1 复合材料的制备6

2.2 分析和测试手段7

2.3  实验步骤和工艺流程7

3 实验分析与结果讨论10

3.1 原位反应体系的热力学和动力学10

3.2 增强相体积分数和摩尔比对反应的影响18

结论24

致谢25

参考文献26

1 引言

  传统的金属基复合材料制造工艺是采用外加增强体的复合方法。这类技术由于增强体易偏聚，增强体与基体之间的物理、化学性质不相容且工艺复杂、成本昂贵，从而严重影响增强相效果[1]。自20世纪80年代末发展起来的原位反应合成法克服了以上传统制备法的缺点，成为当今金属基复合材料研究领域的前沿课题之一。与外加复合工艺相比, 原位反应合成具有以下优点[2]：