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摘要铜基复合材料以其优异的综合性能在生产生活中被广泛应用，本文以 Ti-B-Cu、Al-Ti-B-Cu 系为原料，采用放热弥散法制备了TiB2、CuAl2颗粒增强铜基复合材料。计算了两种体系的反应热力学，结合 DSC 计算各步反应的表观活化能，研究反应机理。通过感应烧结两种体系，对产物进行 SEM 观察，并研究不同增强相体积分数和球磨时间对反应过程和显微组织的影响，结合 XRD 鉴定反应产物的相组成。研究表明：两种体系均按热力学方向两步反应进行，生成 TiB2和 CuAl2颗粒增强相。Ti-B-Cu 和 Al-Ti-B-Cu 体系的两分步反应的表观活化能分别为 633.3kJ·mol-1、1684.8kJ·mol-1和 1050.8kJ·mol-1、1183.7kJ·mol-1。随着升温速率的提高，两反应体系中的反应峰均向高温方向移动。延长球磨时间或提高增强相体积分数时，反应更加充分，组织分布更加均匀。关键词 原位反应 增强相 反应机理 表观活化能 显微组织25991
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Title Study on In-situ Copper Matrix Composites Synthesized by Ti-B-Cu and Al-Ti-B-Cu Systems
Abstract
Copper matrix composites was widely used in production and life for its excellent
performance. In this paper, Ti-B-Cu and Al-Ti-B-Cu systems were used as raw
materials to fabricate TiB2 and CuAl2 particle reinforced copper matrix composites
by heat diffusion method. The reaction thermodynamics of the Ti-B-Cu and Al-Ti-B-Cu
systems were calculated, and the apparent activation energy of each reaction step
was calculated combining with DSC to explore the reaction mechanism. The SEM
observation of reaction products was analyzed. Influence of different
reinforcement volume fraction and milling time on reaction process and
microstructure was explored, and the phase composition was identified combining
with XRD.
Studies have shown that these two systems both reacted in accordance with the
reaction thermodynamics and both could be pided in two steps during sintering
process, generating the TiB2 and CuAl2 particle reinforcement respectively. The
apparent activation energy of each reaction step in Ti-B-Cu system and Al-Ti-B-Cu
system was 633.3kJ·mol-1、 1684.8kJ·mol-1and 1050.8kJ·mol-1、 1183.7kJ·mol-1.
Reactions approximately shift to higher temperature with the increase of heating
rate. Homogeneous microstructure was obtained by increase milling time or
reinforcement volume fraction.
Keywords in-situ reaction method reinforcement reaction mechanism apparent
activation energy microstructure
目 次
1 绪论 ……………………………………………………………………………………… 1
1.1 引言 …………………………………………………………………………………… 1
1.2 铜基复合材料的分类 ………………………………………………………………… 1
1.3 原位反应技术 ……………………………………………………………………………2
1.4 原位合成颗粒增强铜基复合材料的研究现状 …………………………………………3
1.5 本课题研究的主要内容和意义 …………………………………………………………3