Analysis Of Porosity And Its Effect On Mullite Bonded Silicon Carbide

Mohd Hanafi, Suhaimi (2008) Analysis Of Porosity And Its Effect On Mullite Bonded Silicon Carbide. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research is to analyze the porosity content and its effects on mullite bonded silicon carbide with different percentage of graphite content. This research also studies the effect of porosity to the flexural strength, physical properties and microstructure of mullite bonded silicon carbide. This research conducts by following the right procedure of sample preparation including composition of mixture, mixing material, compacting material and sintering process. To get the different content of porosity, graphite was added from the overall percentage of alumina and silicon carbide with 16.2%, 22.5%, 32.6% and 36. 7%. The porosity and its effects of porosity on the sample are investigated using Archimedes test, flexural test, and also observation from Scanning Electron Microscope and X-ray Diffraction. Flexural test was done by using 3-point bending test. The result from the test show the increasing of graphite content increased the number of porosity, volumes of open pores, water absorption and specific gravity but decreased the flexural strength and density of the sample mullite bonded silicon carbide. As a conclusion, the porosity has given the big impact to the properties and structure of mullite bonded silicon carbide. It's reducing the flexural strength of the sample. However, it never changes the phase and structural of the sample.

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