Aluminium matrix composites (AMCs) becomes a choice for automotive and aerospace industries due to its tenable mechanical properties such as high hardness and good strength to weight ratio. Reinforcement like particulate alumina, silicon carbide, graphite, fly ash, etc can easily be incorporated in the melt using cheap and widely available stirring casting method. This research investigates the optimum hardness of AMCs containing basalt powder as reinforcement by setting varying parameter. The design of experiments (DOE) approach using Taguchi method orthogonal arrays L9 (33) factors 3 runs 9, was employed to predict the hardness of material casting with variable parameters such as matrix composition, stirring time, and particle size (mesh) of basalt. ANOVA and S/N ratio for determining optimum hardness (HRb) material and P-value confirms most significant parameter that affects the hardness at optimum level parameters to improve the mechanical properties of AMCs. Analysed Taguchi design observed that particle size (mesh) of basalt has a significant contribution on hardness (72.71%) followed by concentration of basalt (18.62%) and stirring time (8.45%) with an error about 0.22%. Based from previous study and field experiment, this result is match especially from different particle size will affect most of mechanical properties of composite materials.
Indonesia has an abundant amount of basalt rocks resources, including in East Lampung Regency of Lampung Province. This basalt has not been used optimally and only be used as a foundation. The use of basalt as soil fertilizer also known as the stone meal. This study focused on the effect of using basalt dust on the growth and development of organic fertilizer application for the cassava plant. This study is to support the local government policies that declared Lampung as a national development centre of cassava, with a production rate of 30.8% of the national production of cassava. Basalt powder was characterized using test petrograph and X-ray Fluorescence (XRF) for a description of microscopic and chemical composition. The test results were used to determine the chemical composition of rock classification using the TAS diagram. The experiments of applying fertilizer on cassava crops in the demonstration plots 8 treatment x 3 repetitions were conducted by adding the percentage by weight of the basalt towards organic fertilizer between 0% (control 1), 10%, 20%, 30%, 40%, 50%, 60%, and without treatment (control 2). The results indicated that basalt from East Lampung is classified as olivine Tholeite basalt which is rich in CaO, Mg and Na2O + K2O. The growth rate of cassava plants which are affected by basalt powder presentation is characterized by a value which is higher than the value of CGR control, and recommended to not exceed 10% of the weight of basalt fertilizer.
Optimasi perlakuan panas dan proses stir casting komposit matriks aluminium berpenguat serbuk basalt menggunakan metode Taguchi dan analysis of variance (Anova) telah dilakukan. Desain eksperimen menggunakan metode Taguchi L9 Orthogonal array 3^3 dengan tiga faktor yaitu persentase basalt terhadap aluminium dengan tiga level komposisi 5%, 10%, 15%, temperatur perlakuan panas dengan tiga level suhu 100oC, 155oC, 200oC, dan media pendingin dengan tiga variasi media udara, air, dan oli. Pembuatan sampel menggunakan metode stir casting dengan kecepatan pengadukan konstan dan temperatur penuangan antara 660oC – 750oC, dengan ukuran partikel basalt 200 mesh. Sampel hasil pengecoran setelah perlakuan panas kemudian diuji mekanik yang meliputi uji kuat tarik dengan standar ASTM E8 dan uji kekerasan metode Rockwell. Hasil analisis Taguchi menunjukkan bahwa kuat tarik optimum diperoleh dari faktor dan level persentase basalt 5%, perlakuan panas pada temperatur 200oC, dan media pendingin air, sedangkan nilai kekerasan optimum diperoleh dari parameter persentase basalt 5%, perlakuan panas 100oC, dan media pendingin udara. Media pendingin merupakan faktor yang paling berpengaruh secara signifikan baik untuk nilai uji tarik maupun nilai kekerasan dari komposit aluminium-basalt yang telah mendapatkan perlakuan panas. Penambahan basalt sebesar 5% berat telah terbukti meningkatkan kuat tarik dan kekerasan komposit matriks aluminium.
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