Pengaruh Fraksi Penguat Fly Ash Dan Temperatur Cetakan Terhadap Sifat Kekerasan Dan Struktur Mikro Pada Metal Matrik Komposit

Ghazali Arrahim, Muhammad and Prof. Dr. Ir. Wahyono Suprapto,, MT.Met and Dr. Femiana Gapsari,, S.T., M.T (2021) Pengaruh Fraksi Penguat Fly Ash Dan Temperatur Cetakan Terhadap Sifat Kekerasan Dan Struktur Mikro Pada Metal Matrik Komposit. Magister thesis, Universitas Brawijaya.

Abstract

"Metal Matrix Composite merupakan salah satu komposit logam yang memanfaatkan paduan aluminium sebagai matrik dalam fabrikasinya. Metal Matrix Composite memiliki aplikasi yang luas dalam bidang industri, karena sifatnya yang ringan dan kekuatan tinggi. Dalam pembuatanya material penguat yang digunakan berupa fly ash. Fly ash merupakan limbah pembakaran batu bara pada pembangkit listrik tenaga uap yang mengandung fraksi penguat berupa alumina (Al2O3) dan silika (Si) yang cukup tinggi proses pembuatan spesimen menggunakan metode metalurgi serbuk, Bahan baku yang digunakan adalah serbuk aluminium sebagai matrik dan fly ash sebagai penguat. Fly ash yang digunakan divariasikan dalam pencampuran serbuk sebesar 5%, 10%, 15%, 20%, dam 25%. Kepadatan sangat berpengaruh sekali terhadap kekuatan dari produk yang dihasilkan. Proses kompaksi dilakukan dengan hot isostatic pressure sehingga menjadikan serbuk menjadi lebih lunak/plastis dan memudahkan untuk dipadatkan. Pengaruh suhu pemanasan pada cetakan divariasikan sebesar 250oC, 300oC, dan 350oC agar didapat ikatan yang homogen. Pada penelitian yang dilakukan, hasil penelitian menunjukan nilai kekerasan spesimen meiningkat sebesar 1,7% sebesar 65,07 HRB pada variasi penguat 10% fly ash, kemudian secara kontinyu menurun hingga 16,92% dengan nilai kekerasan sebesar 55,64 HRB pada variasi penguat fly ash 25%. Hasil pengamatan scanning electron microscope menunjukan pengaruh temperatur pemanasan cetakan memberikan penyebaran partikel merata pada temperatur 300oC sehingga menyebabkan ikatan antar partikel antara matrik dan penguat terikat lebih baik dan pada temperatur 250oC dan 350oC menunjukan penyebaran partikel penguat yang tidak merata dan mengakibatkan penggumpalan partikel penguat sehingga spesimen yang dihasilkan bersifat getas dan menyebabkan penurunan kekerasan pada variasi fraksi dengan kadar fly ash diatas 10%. Keywords : Metal Matrix Composite, Aluminium, Fly Ash, Metalurgi Serbuk, Sintering, Hot Isotatic Pressure. "

English Abstract

Metal Matrix Composite is one of the metal composite utilizing aluminum alloys as a matrix in its fabrikation. Metal Matrix Composite has extensive applications in the industry, because of its lightweight and high strength. In making the use of aluminum alloys as a matric based on aluminum itself as conventional material has several disadvantages including in terms of strength and violence. In this case the manufacture of metal composites is necessary to add an amplifier with the specifications of the element that has an impact on the strengthening of the matrix used, the aluminum matrix. The amplifier material used in this research is Fly Ash. Fly Ash is a waste of coal burning in a steam power plant that contains an amplifier faction in the form of a high silica (SI). In this study the process of fabrication / making specimens using powder metallurgical methods, the raw material used is aluminum powder as a matrix and fly ash as an amplifier. Powder metallurgy itself is a production technique using powder as an initial material then the formation process is carried out. The process is carried out, by compacting the metal into a cool form and then heat it under the melting temperature. So that particles between matrices and amplifiers can better bind because of the mass transport mechanism due to the diffusion of atoms between particle surfaces. The metallurgical method of powder provides good control of composition and mixed use that cannot be fabricated with other processes. As a measure is determined by the mold and final settlement. The fly ash used as a reinforcement in this study was varied into the matrix on powder mixing of 5%, 10%, 15%, 20%, dam 25%. To get the desired density so that the value of violence in the specimens can be increased, in the process of the mold compaction given a variety of heating temperatures of 250oC, 300oC, and 350oC to make powder softer / plastic and facilitate to be compacted to obtain the bond between homogeneous particles. Then axial emphasis is carried out using hot emphasis (hot isostatic pressure). In the research conducted, the results of the study showed the value of the violence of specimens increased by 1.7% with the value of violence of 65.07 Hrb. In the variation of 10% FLY ASH amplifier fraction, the value of the violence of the specimen turned out to have not experienced a continuous increase where the value of the violence then decreased by 16.92% with a violence value of 55.64 Hrb in a variation of 25% fly ash amplifier. The Aluminum Fly Ash MMC specimen with the highest violence value is found in variations in fraction with 10% Fly Ash level. Decrease in the value of violence in the MMC aluminum fly ash specimen can be seen through the observation of the scanning electron microscope. Where in the observation of the scanning electron microscope that refers to the variation of the mold temperature, it is known at the temperature of 300oC results showing the spread of fly ash on the aluminum matrix where the bond between particles between the matrix and the amplifier is better, then at a temperature of 250oC and 350oC indicate the deployment of uneven amplifier particles and resulted in clitting of the amplifier particles so that the specimens produced are brittle and cause a decrease in violence Keywords: Metal Matrix Composite, Aluminum, Fly Ash, Metallurgy Powder, Sintering, Hot Isotatic Pressure

Item Type:	Thesis (Magister)
Identification Number:	042107
Uncontrolled Keywords:	Metal Matrix Composite, Aluminium, Fly Ash, Metalurgi Serbuk, Sintering, Hot Isotatic Pressure
Subjects:	600 Technology (Applied sciences) > 621 Applied physics > 621.8 Machine engineering
Divisions:	S2/S3 > Magister Teknik Mesin, Fakultas Teknik
Depositing User:	Unnamed user with username verry
Date Deposited:	23 Oct 2021 08:43
Last Modified:	30 Sep 2024 07:08
URI:	http://repository.ub.ac.id/id/eprint/185501

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