Development of Al-Cu-SiCp metal matrix composite for automotive applications
In recent years, the demand for reduced weight and high performance materials for automotive applications such as brake disc have increased. The newly developed, aluminium metal matrix composite (AI-MMC) reinforced with silicon carbide (SiC) particulate seem suitable to be an alternative mater...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2005
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7672/1/24p%20MOHD%20AZLIS%20SANI%20MD%20JALIL.pdf |
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| Summary: | In recent years, the demand for reduced weight and high performance materials
for automotive applications such as brake disc have increased. The newly developed,
aluminium metal matrix composite (AI-MMC) reinforced with silicon carbide (SiC)
particulate seem suitable to be an alternative material for this application. In this
experimental study, AI-Cu-SiCp MMC was developed through stir casting method with
sand mould. A constant 4.5% of weight percentage of 5 !-Ull pure copper powder was
added to the mixtures to enhance the properties of AI-MMC. The effects of particle
sizes of SiC as well as the weight percentage of SiC, pouring temperature and stirring
time on the hardness, wear, compressive properties, flexure behavior and density of Al�Cu-SiCp MMC were investigated. Taguchi's Robust Parametric Design was used \vith
ilmer array L9 34 and outer array with 2 replications to plan the experimental runs. A
statistical Pareto Analysis of Variance (Pareto ANOVA) was employed to detennine the
significant factors of these properties and optimum combinations of process variables
for targeted functions. From the analysis, it was found that particle sizes of SiC is the
most significant factor for density characteristic and compressive properties while
weight percentage of SiC is the most significant factor for hardness and wear resistance
characteristics. Optimum combinations were determined and conformity test were
conducted to verify the optimum properties of newly developed material, AI-Cu-SiCp
MMC. Optimum combination of hardness was AIB2CoDO ( 59 fllll particle size af SiC,
15% af weight percentage af SiC, 675°C pauring temperature and 5 minutes stirring
time) with 82.5 HV; wear rate A2B2C2Do ( 106 flm particle size af SiC, 15% af weight
percentage af SiC, 725°C pauring temperature and 5 lllinutes stirring time) with 1.585
x 10-5 g/sec; compressive strength A1B2C2Dl (59 flm particle size of SiC, 15% afweight
percentage af SiC, 725°C pouring temperature and 10 minutes stirring time) with
9410.06 MPa and density AoB1C1Dl ( 40 flm particle size af SiC, 10% af weight
percentage of SiC, 700°C pauring temperature and 10 minutes stirring time) with
2.6592 g/cm3
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