Analysis About The Effect Of Composition Of Green Bodies On Mullite Bonded Silicon Carbide

Muhammad Affendi, Mustafa (2008) Analysis About The Effect Of Composition Of Green Bodies On Mullite Bonded Silicon Carbide. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The main scope of this project is to study the effect on the properties of mullite bonded silicon carbide with a various green body’s composition. The composition use to produce the mullite bonded Silicon carbide is alumina and SiC. To produce the sample of porous SiC, there are certain procedure needs to be follow. The process sequences are as follow; set the composition, mix the composition, compact the mixture to green body, sinter the green body, and cut the sample to required dimension. The four different composition being use in this research are 1.5:1, 2.1:1, 3:1, and 4:1. The properties involve in this study are such as density, strength and elastic modulus of the SiC. Two type of test performed to the sample is the flexural strength test and density observation. In flexural strength, the selected method to do the test is three point bending test. Three point bending is the most suitable test for ceramic in order to determine the flexural strength. The value obtain from the flexural strength are as follow, 9.03 MPa (1.5:1, alumina 40wt%), 13.45 MPa (2.1:1, alumina 32.3 wt%), 15.75 MPa (3:1, alumina 25 wt%), and 20.06 MPa (4:1, alumina 20 wt%). The standard measurement of the sample is followed from the ASTM standard. For density observation, the density of every sample is compared to one another after all the samples had gone through sintering process. The values of the density are as follow 2472 kgm-3 (1.5:1), 2489 kgm-3 (2.1:1), 2536 kgm-3 (3:1) 2670 kgm-3 (4:1). Several analyses have also been done prior to this research. The types of analysis are SEM and XRD observation. The purpose of SEM observation is to recognize the microstructure of the samples with different composition while XRD analysis is to determine the phase composition of every sample. At the end of the research, the optimum composition to produce mullite bonded silicon carbide is selected.

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