《混合稀土cual合金薄板内氧化制备弥散铜ic框架材料研究》由会员分享，可在线阅读，更多相关《混合稀土cual合金薄板内氧化制备弥散铜ic框架材料研究（54页珍藏版）》请在金锄头文库上搜索。
1、河南科技大学 硕士学位论文 混合稀土Cu-Al合金薄板内氧化制备弥散铜IC框架材料研究 姓名：杨争 申请学位级别：硕士 专业：材料学 指导教师：田保红 20091201 摘 要 I 论文题目：论文题目：混合稀土 Cu-Al 合金薄板内氧化制备弥散铜 IC 框架材料 研究 专专 业：业：材料学 研研 究究 生：生：杨争 指导教师：指导教师：田保红 教授 摘摘 要要 Al2O3弥散强化铜基复合材料不仅具有良好的导电性、导热性，高的室温强 度，而且高温强度同样优越，广泛用于引线框架、电真空器件和电阻焊电极等。 在众多制备方法中，用内氧化法制备的Al2O3弥散强化铜复合材料性能良好，但 目前尚存在工艺
2、复杂、生产周期长、成本昂贵等问题。 本文采用以工业氮气中的余氧作为内氧化介质将 Cu-Al 合金和 Cu-Al-RE 合 金在管式炉中直接进行内氧化，工艺过程简单。本文研究了温度、时间及混合稀 土(Ce+Y)对 Cu-Al 合金内氧化动力学的影响；研究了内氧化法制备的 Cu-Al2O3 和 Cu-Al2O3/(Ce+Y)复合材料的导电率、显微硬度、抗拉强度和并进行了显微组 织观察，分析了(Ce+Y)对复合材料性能和显微组织的影响；并研究了 Cu-Al2O3 和 Cu-Al2O3/(Ce+Y)复合材料显微硬度随退火温度的变化规律，及导电率、显微 硬度和抗拉强度随变形量的变化关系，揭示了 Al2O
3、3弥散强化铜复合材料的高温 软化和再结晶行为，为该类复合材料的制备和广泛应用提供依据。 结果表明：在相同的内氧化温度条件下，添加稀土的 Cu-Al 合金内氧化层厚 度明显比未添加的内氧化层厚度大，表现出明显的催渗效果，其中 Cu-Al- 0.1(Ce+Y)薄板在 950C2h 内氧化的氧化层厚度为 363m，比未添加的 Cu-Al 内 氧化层厚度增加了 60%；内氧化成功制备了 Cu-Al2O3/RE 复合材料，HREM 和 TEM 分析和计算表明，经内氧化制备的 Cu-Al2O3/RE 复合材料在基体上生成了 弥散分布的细小的 -Al2O3颗粒，颗粒粒径约为 5nm10nm，颗粒间距约为 1
4、0nm30nm，在晶内和晶界弥散分布，与基体保持完全共格或半共格关系；适 量稀土元素(Ce+Y)的加入提高了 Cu-Al2O3复合材料的显微硬度和抗拉强度和软 化温度。Cu-Al2O3/0.05(Ce+Y)复合材料的软化温度比未添加稀土(Ce+Y)的 Cu- Al2O3复合材料的软化温度提高了 100C，达到 800C。变形量和混合稀土比例 对 Cu-Al2O3和 Cu-Al2O3/(Ce+Y)复合材料的软化温度和再结晶温度影响不大；冷 轧变形使 Cu-Al2O3复合材料的显微硬度和抗拉强度得到了大幅度提高，且随着 变形量的增加而增加。经 950C2h 内氧化制备的 Cu-Al2O3复合材料经
5、 80%冷变 摘要 II 形后，显微硬度和抗拉强度分别增加了 45HV 和 168MPa，达到 135HV 和 390MPa。 本文研究表明，经 950C 和 2h 内氧化制备的 Cu-Al2O3/0.05(Ce+Y)复合材料 综合性能最好，Cu-Al2O3/0.05(Ce+Y)复合材料经 80%冷变形后，硬度和抗拉强 度分别达到 138HV 和 407MPa。 关关 键键 词：词：Cu-Al2O3复合材料，内氧化，稀土元素(Ce+Y)，弥散强化，动力 学，IC 框架材料 论文类型：论文类型：应用基础研究 摘要 III Subject: Study of Oxide Dispersion Co
6、pper for IC Lead Frame Material Prepared by Internal Oxidation Method with Mixed Rare Earth-Cu-Al Alloy Specialty: Material science Name: Yang Zheng Supervisor: Professor Tian Bao-hong ABSTRACT Al2O3 dispersion strengthened copper base composite is suitable for IC lead frame materials with high elec
7、trical conductivities, high strength and high thermal at room temperate as well as at elevated temperature. The Al2O3 dispersion strengthened copper base composite has been widely used as weld electrode, electronic vacuum devices, and lead frame etc. Among the various fabrication methods of the comp
8、osite, the internal oxidation method is a better way to fabricate Cu-Al composites with excellent properties. The shortcomings of the internal oxidation method is due to the complex process, long production cycle and high cost, etc. The internal oxidations of the Cu-Al alloy and Cu-Al-RE alloy were
9、carried out with the commercial nitrogen gas medium in a tube-type resistance furnace. The process was relative simple. In this paper, the effects of internal oxidizing temperature, time and additive of the mixed rare earth (Ce+Y) on the Cu-Al alloy internal oxidation kinetics were investigated. The
10、 electrical conductivities and tensile strength of the Cu- Al2O3 composite and Cu-Al2O3/(Ce+Y) composite prepared by the simplified internal oxidation were investigated. The microstructure of the composites was observed by SEM, TEM and HRTEM respectively. The effects of adding rare earth elements of
11、 (Ce+Y) on the performance and microstructure of the Cu-Al2O3 composite were investigated. The change rules of microhardness and electrical conductivity, tensile strength with different cold deformations were determined. The relationship between the microhardness of the Cu-Al2O3 and Cu-Al2O3/(Ce+Y)
12、composite and the annealing temperature was studied. The behaviors of the recovery and recrystallization of the Cu- Al2O3 composite and Cu-Al2O3/(Ce+Y) composite at high temperature were discussed, which is benefit to the preparement and application of the Al2O3 dispersion strengthened copper base c
13、omposites. The results show that the addition amount of rare earth elements of (Ce+Y) in Cu- 摘要 IV Al alloy can accelerate the internal oxidation process. The internal oxidation layer of Cu-Al-0.1(Ce+Y) increases by 60% at 950C2h. The Cu-Al2O3 composite and Cu- Al2O3/RE composite were succefully pre
14、pared by the simplified Cu-Al alloy internal oxidation process. The HRTEM and TEM observation and calculations show that the nanometer -Al2O3 particles distributed in the matrix of the Cu-Al2O3/RE composite with the size of 5nm10nm and the interspace of 10nm30nm. The misfit of the - Al2O3 and matrix
15、 keeps coherent and or half-coherent. The addition of rare earth elements (Ce+Y) in Cu-Al alloy increases the microhardness, tensile strength and softening temperature after the internal oxidation. The softening temperature is about 800C of the composite. The addition of rare earth elements (Ce+Y) in Cu-Al alloy increases the softening temperature by 100C. The softening temperature of Cu-Al2O3 composite changed slowly after cold deformation. After the internal oxidation at 950C for 2h and the cold deformation of 80%, the microhard
