Studi dan Karakterisasi Pengaruh Kandungan ZrO2 Terhadap Struktur, Densitas dan Kekerasan Vickers Komposit Al2O3/ZrO2

Nehan, Phahul Zhemas Zul (2023) Studi dan Karakterisasi Pengaruh Kandungan ZrO2 Terhadap Struktur, Densitas dan Kekerasan Vickers Komposit Al2O3/ZrO2. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pengaruh kandungan zirkonia (ZrO2) terhadap pembentukan fasa, sifat fisik dan dan mekanik komposit alumina/zirkonia (A/Z) telah dipelajari. Material utama berupa produk komersial alumina (Al2O3) dan zirkonia (ZrO¬2) pada penelitian ini menunjukkan fasa gamma-alumina (γ-Al2O3) dan fasa monoklinik zirkonia (ZrO2). Diawali dengan pencampuran Al2O3 dan ZrO2 yang diaktivasi secara mekanis menggunakan alat mill dan disinter pada suhu 1400 ◦C selama 3 jam. Sebelum disinter komposit A/Z dikompaksi pada tekanan 10 MPa selama 60 detik. Analisis unsur ZrO2 komersial dan fase komposit A/Z dilakukan melalui X-ray fluorescence spectroscopy (XRF) dan X-ray diffraction (XRD). Karakterisasi fourier transform infrared spectroscopy (FTIR) dilakukan untuk mengkonfirmasi gugus fungsi di dalam komposit A/Z. Pengujian fisik dan mekanik komposit A/Z meliputi diameter penyusutan, densitas dan kekerasan Vickers. Hasil penelitian ini menunjukkan data bahwa serbuk ZrO2 komersial mengandung 97,13% unsur zirkonium (Zr) dan 97,33% oksida zirkonia (ZrO2). Kemudian, fasa komposit A/Z sebelum sinter teridentifikasi sesuai dengan material utamanya yaitu gamma-alumina (γ-Al2O3) dan monoklinik zirkonia (m-ZrO2¬). Analisis lebih lanjut setelah komposit A/Z disinter menunjukkan transformasi fasa seperti fasa gamma-alumina (γ-Al2O3) menjadi korundum (α-Al2O3), fasa monoklinik zirkonia (m-ZrO2) menjadi tetragonal zirkonia (t-ZrO2) dan sebagian tetap monoklinik zirkonia (m-ZrO2). Komposit A/Z menunjukkan densitas mengalami peningkatan dan porositas mengalami penurunan seiring dengan penambahan kandungan ZrO2. Sementara itu, nilai kekerasan Vickers komposit A/Z menunjukkan peningkatan dengan bertambahnya kandungan ZrO2. Sampel komposit A/Z 60:40 wt% memiliki penyusutan terbesar pada diameter pelet, porositas terendah, densitas dan kekerasan tertinggi, yang mencapai 8,00 %; 4,09%; 4,349 g/cm3 dan 13,34 MPa secara berurutan. Di sisi lain, struktur material Al2O3 sebagai matriks dinilai cukup berpengaruh terhadap intensitas pola difraksi sinar-X yang dihasilkan komposit A/Z.
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The effect of zirconia contents on the structural, physical, and mechanical properties alumina/zirconia (A/Z) composites were studied. The main materials are studied of alumina (Al2O3) and zirconia (ZrO2) comercial products exhibited gamma-alumina (γ-Al2O3) and monoclinic zirconia (m-ZrO2) phases recpectively. Initialed mixture Al2O3 and ZrO2 were mechanically activated on mill instrument and sintered at 1400 ◦C for 3 hours. Before sintering A/Z composites were compacted at pressure 10 MPa during 60 second. The elemental ZrO2 comercial analysis and phase analysis of A/Z composites were performed via X-ray fluorescence spectroscopy (XRF) and X-ray diffraction (XRD). Fourier transform infrared spectroscopy (FTIR) caracterization was confirmed functional grups in A/Z composites. Physical and mechanical test of A/Z composites included diameter shrinkage, density, and Vickers hardness. The results of study have showed that the comercial ZrO2 powder contain 97.13% zirconium (Zr) and 97.33% zirconia (ZrO2). However, A/Z composites phase before sintering identified according to its main materials were gamma-alumina (γ-Al2O3) and monoclinic zirconia (m-ZrO2). Further analysis of the sintered A/Z composites have showed phase transformation such as the gamma-alumina (γ-Al2O3) into corundum (α-Al2O3), the monoclinic zirconia (m-ZrO2) into tetragonal zirconia (t-ZrO2) and same of the monoclinic zirconia (m-ZrO2). A/Z composite show increased density and decreased porosity herewith addition of ZrO2 content. Meanwhile, hardness Vickers A/Z systems show increased with increasing ZrO2 contents. The A/Z composite 60:40 sample had the largest shrinkage in pellet diameter, lowest porosity, highest density and Vickers hardness at 8.00 %; 4.09%, 4.349 g/cm3, and 13.34 MPa respectively. On the other hand, the structure of the Al2O3 material as a matrix has considered to have quite an effect on the intensity of the X-ray diffraction pattern produced by the A/Z composite.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Densitas, kekerasan, komposit, sintering, ZrO2.
Subjects:	Q Science > QC Physics Q Science > QC Physics > QC173.4.C63 Composite materials
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45101-(S2) Master Thesis
Depositing User:	Phahul Zhemas Zul Nehan
Date Deposited:	12 Feb 2023 12:41
Last Modified:	12 Feb 2023 12:41
URI:	http://repository.its.ac.id/id/eprint/96620

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