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Study of Oxide Dispersion Copper for IC Lead Frame Material Prepared by Internal Oxidation Method with Mixed Rare Earth-Cu-Al Alloy

Author: YangZheng
Tutor: TianBaoHong
School: Henan University of Science and Technology
Course: Materials Science
Keywords: Cu - Al2O3 composite Internal oxidation Rare earth elements (Ce Y) Dispersion strengthened Dynamics IC frame material
CLC: TB331
Type: Master's thesis
Year: 2009
Downloads: 33
Quote: 0
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Abstract


Al 2 O 3 dispersion strengthened copper matrix composite material not only has good electrical conductivity, thermal conductivity, high strength at room temperature, and the same superior high temperature strength, widely used in the lead frame electric vacuum devices and resistance welding electrodes. In many preparation methods, the internal oxidation Al 2 O 3 dispersion strengthened copper composite good, but there is still a complex process, long production cycle, cost expensive problems. Paper, the Cu-Al alloy and Cu-Al-RE alloys within the oxidizing medium to the remainder of oxygen as the industrial nitrogen in a tube furnace directly to internal oxidation, the process is simple. Temperature, time, and the mixed rare earth elements (Ce Y) of Cu-Al alloy oxidation kinetics; the studied internal oxidation of Cu-Al 2 O 3 and Cu-Al 2 O 3 / (Ce Y) composite material conductivity, microhardness, tensile strength and a microstructure observation, (Ce Y) of the composite material properties and microstructure; Cu-Al 2 O 3 and Cu-Al 2 O 3 / (Ce Y) composite microhardness variation with annealing temperature and conductivity, microhardness and tensile strength of the relationship with the amount of deformation changes revealed Al < sub> 2 O 3 dispersion strengthened copper composite material of high temperature softening and recrystallization behavior, provide the basis for class composites and widely used. The results show that: under the same temperature conditions of the internal oxidation, adding the thickness of the Cu-Al alloy of the rare earth oxide layer is significantly higher than the large thickness of the inner oxide layer is not added, showed obvious reminder infiltration effect, wherein the Cu-Al-0.1 (Ce Y) sheet 950oC × 2h oxidation oxide thickness of 363μm, than a 60% increase in the thickness of the oxide layer within the Cu-Al not add; internal oxidation successful preparation of Cu-Al 2 O < sub> 3 / RE composite, HREM and TEM analysis and calculations show that prepared by the internal oxidation of Cu-Al 2 O 3 / RE composite materials in generated on the matrix finely dispersed γ-Al 2 O 3 particles, the particle size is about 5nm 1 0nm, the particle spacing of about for 10nm 3 0nm, in intragranular and grain boundary diffusion distribution, remain completely coherent or semi-coherent relationship with the matrix; appropriate amount of rare earth elements (Ce Y) is added to improve the Cu-Al 2 O 3 composite microhardness and tensile strength and the softening temperature. Cu-Al 2 O 3 / 0.05 (Ce Y) the softening temperature of the composite ratio is not added rare earth (Ce Y) Cu-Al 2 O 3 composite softening raise the temperature of 100oC, 800oC is reached. Deformation and mixed rare earth proportion of Cu-Al 2 O 3 and Cu-Al 2 O 3 / ( Ce Y) the softening temperature of the composite and the recrystallization temperature has little effect; cold-rolled deformed Cu-Al 2 O 3 composite microhardness and tensile strength been greatly improved, and with the increase in the amount of deformation increases. By 950oC × 2h oxidation of Cu-Al 2 O 3 composites after 80% cold deformation, microstructure, hardness and tensile strength increased 45HV and 168MPa reach 135HV and 390MPa. This study shows that the best overall performance of the composite after the 950oC and 2h oxidation of Cu-Al2O3/0.05 (Ce Y), Cu-Al2O3/0.05 (Ce Y) composites after 80% cold deformation, hardness and tensile strength, respectively, the 138HV and 407MPa.

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