Studi Sifat Mekanik Komposit Isotropik Al/SiO2 Hasil Fabrikasi dengan Metalurgi Serbuk

Hanafi Hanafi, M Munasir, Mochamad Zainuri (DOI: 10.12962/j24604682.v12i2.1331)

Abstract


Telah dilakukan pembuatan komposit Al/SiO2 melalui metode metalurgi serbuk dengan menggunakan aluminium sebagai matrik yang digabungkan dengan nano silika (SiO2) yang diperoleh dari hasil sintesis pasir Bancar Tuban melalui metode kopresipitasi. Fabrikasi komposit dilakukan dengan metode metalurgi serbuk pencampuran basah, dengan medium pencampur berupa larutan butanol, dan disintering pada temperatur 500C selama 2 jam dalam furnace vakum. Hasil fabrikasi dilakukan beberapa analisis dan uji untuk mengetahui sifatsifatnya,
seperti densitas dan porositas, serta uji menggunakan XRD, SEM-EDX dan uji tekan (Brinnel). Hasil penelitian menunjukkan bahwa dari analisis XRD diperoleh komposit Al/SiO2 pada x = 0% hingga 30% dengan fase kristal berupa Al dan sedikit Al2O3 dan SiO2 yang ditunjukkan oleh puncak difraksi yang rendah. Peningkatan fraksi volume SiO2 pada komposit cenderung menurunkan densitas dan meningkatkan porositas. Demikian pula dari hasil uji mekanik, kuat luluh (Yield Strength (YS), kuat tekan (CS), kuat tekan maksimum (UCS) dan modulus elastis (ME) serta kekerasan bahan (BHN) cenderung mengalami penurunan dengan bertambahnya fraksi volume SiO2 diatas 5% pada komposit Al/SiO2. Nilai YS, CS, ME dan kekerasan bahan memiliki nilai tertinggi ketika fraksi volume SiO2 dalam komposit adalah 5%.

Abstract


Composites of Al/SiO2 have been fabricated through powder metallurgy method using aluminium as matrix and combined with nano silica (SiO2). SiO2 was obtained from the synthesis of sand of Bancar Tuban through
copresipitation method. Fabrication of composites was performed by  powder metallurgy method by the wet mixing method, by using butanol as solution. The sample was sintered at a temperature of 500C for 2 hours in
a vacuum furnace. The samples were analyzed and tested to determine its properties, as density, porosity, and tested by XRD, SEM-EDX and pressure test. The results showed that based on the XRD analysis was obtained
composite Al/SiO2 at x= 0% to 30% with a crystalline phase of Al and Al2O3 and SiO2 slightly indicated by a low peak. Increased of the volume fraction of SiO2 on composite was tended to decrease of density and increase porosity. The results of mechanical tests was show that yield strength (YS), compressive strength (CS), elastic modulus (EM), hardness tends to decrease with increasing volume fraction of the composite of SiO2. Value YS, CS, EM and hardness of materials has the highest value when the volume fraction of SiO2 in the composite is 5%.


Keywords


Al/SiO2 composites, nano-composites, aluminum, nanosilika, mechanical properties

Full Text:

PDF

References


W.D. Callister Jr, Materials Science and Engineering: An Introduction (7th edition, JohnWiley and Sons, Inc., United States of America, 2007).

M. Ariati, dan A. Zulfia, Makara, 10, 18-23 (2006).

S. Deni, Jurnal Makara Sains, 12, 126-133 (2008).

J. Hasim, L. Looney, M.S.J. Hashmi, J. Material Processing Technology, 119(1-3), 329-335 (2001).

H.L. Rizkalla, A. Abdulwahed, J. Material Processing Technology, 56, 398-403 (1996).

H. Zuhailawati, P. Samayamutthirian, M.C.H. Haizu, Fabrication of Low Cost of Aluminium Matrix Composite Reinforced with Silica Sand, Scholl of Materials and Mineral Resource Engineering, University Science Malasyia, Engineering Campus, 2007.

M. Sayuti, et al., J. Material Processing Technology, 201(1), 731- 735 (2008).

Surahmat, Munasir, Triwikantoro, J. Fis. dan Apl., 7(2), 110202:1-4 (2011).

Munasir, Triwikantoro, M. Zainuri, Darminto, JPFA-Unesa, 3(2), 12-17 (2013).

Widyastuti, dkk., Makara Sains, 12(2), 113-119 (2008).

S. Suresh, A. Mortensen, Fundamental of Metal Matrix Composites (Butterworth-Heinemann, London, 1993).

N. Chabibah, Pengaruh Media Pencampur terhadap Kualitas Mekanik Bahan Komposit Al/SiC, Skripsi, Fisika, FMIPA-ITS, Surabaya, 2011.

R.M. Springgs, T. Vasilos, J. Am. Ceram. Soc., 40(4), 187 (1961).




DOI: http://dx.doi.org/10.12962/j24604682.v12i2.1331

Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.