Kenaf fiber has been cultivated as an industrial crop. In this paper, we present the ongoing works of an assessment on the mechanical properties of its fiber composites. Tensile, flexural and impact tests were executed on untreated short kenaf fiber reinforced epoxy composites. Its fiber content is varied from 5% up to 20%, and was compared to neat epoxy (NEAT). Using a hand lay-up technique, a mixture of kenaf fiber and epoxy is poured into a mould and left to dry at room temperature for 24 hours. Seven specimens were cut according to ASTM D3039, ASTM D790 and ASTM D256 for the tensile test, flexural test and impact test, respectively. The results showed that the tensile, flexural and impact strengths of the kenaf fiber are lower compared to NEAT. Samples at 5% kenaf fiber content shows the highest tensile strength, flexural strength and impact strength at 27. 1 MPa and 18.2 MPa and 0.56 kJ/m2, respectively. The 5% fiber content was finalized as the fiber content that can be applied in archery.
Abstract. This paper presented the research works on the investigation of the thermal behavior of the natural fibres; i.e. pineapple leaf fibre, kenaf fibre and mengkuang fibres reinforced epoxy. The thermogravimetric analysis and differential scanning calorimetric analysis were used to measure the thermal behavior of the treated and untreated pineapple, kenaf and mengkuang fibres reinforced epoxy. The samples for both analysis were subjected to maximum temperature 600°C at the heating rate of 10°C/min. The results showed that the treated fibres show higher maximum peak temperature as compared to the untreated fibres. Additionally, the glass transition temperature showed a lower value for all treated fibre. It can be concluded that investigation of thermal properties of these natural fibres could improve the utilization of natural fibre composites in various applications i.e. sports applications.
The development of supercritical (SC) and ultra-supercritical (USC) power plants requires materials with better corrosion properties. Deep understanding on the oxidation mechanism in the boiler environment is one of the important factors to support this development. In this work, high temperature oxidation of Fe-Cr steels in steam condition is reviewed. Several mechanisms that explain the effect of water vapor in the oxidation behavior the steel were presented.
The utilisation of natural fibre and the waste product becomes necessary to develop the sustainability in various industries. The usage of natural fibres in the sport-oriented industries is increasing in the recent years. In this paper, we presented the finite element analysis of the hybrid carbon fibre composites of recurve bows riser. The experiments of the tensile and flexural test were conducted on the various composition of hybrid materials. The pineapple leaf fibre and kenaf fibre are varied with 5% and 10%, was respectively hybridised with 95% and 90% carbon fibre as the overall fibre content is 40%. The material properties of the best composition of 95 CF/5 PALF were used in finite element analysis. It can be concluded that the alternative design of recurve riser was suitable for the alternative material and suit to Malaysian junior archer.
Abstract. The future thermal power plant is expected to operate at higher temperature to improve its efficiency and to reduce greenhouse gas emission. This target requires better corrosion properties of ferritic steels, which commonly used as materials for superheater and reheater of boiler tubes. In this work, chromium enrichment on the surface of ferritic steel is studied. The deposited chromium is expected to become a reservoir for the formation of chromia protective layer. Chromium was deposited on the substrate of steel by pack cementation process for two hours at the temperature of 850ºC, 950ºC and 1050ºC, respectively. XRD analysis indicated that chromium was successfully deposited at all temperatures. Somehow, SEM cross sectional image showed that continuous layer of chromium was not continuously formed at 850oC. Therefore, this research clarify that chromium enrichment by pack cementation may be conducted at the temperature above 950°C.
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