Studi Struktur, Sifat Mekanik, dan Sifat Elektrokimia Kompoait ZrO2/Al2O3 dari Pasir Zirkon Alam

Murti, Cahyaning Fajar Kresna (2025) Studi Struktur, Sifat Mekanik, dan Sifat Elektrokimia Kompoait ZrO2/Al2O3 dari Pasir Zirkon Alam. Doctoral thesis, Institut Teknologi Sepuluh Nopember.

Text 01111860010004-Desertation.pdf Restricted to Repository staff only Download (23MB) | Request a copy

Abstract

Pemanfaatan sumber daya alam lokal sebagai bahan baku material fungsional berpotensi mengurangi ketergantungan terhadap material impor. Penelitian ini bertujuan untuk mensintesis dan mengkarakterisasi komposit ZrO₂/Al₂O₃ polimorfi (amorf dan tetragonal) serta ZrSiO₄/Al₂O₃ berbasis pasir zirkon alam asal Kalimantan sebagai sumber zirkonia dan zirkon. Serbuk zirkon dimurnikan dan dikonversi menjadi ZrO₂ melalui metode alkali fusion, kemudian dikombinasikan dengan Al₂O₃ dan disinter menggunakan metode konvensional (1200–1300 °C, 3–7 jam) serta spark plasma sintering (SPS) (40–80 MPa, 10 menit). Hasil XRD menunjukkan pembentukan fasa zirkon, korundum, tetragonal dan monoklinik zirkonia, serta mullite. Citra SEM memperlihatkan bahwa sintering SPS menghasilkan difusi antarpartikel yang lebih intens dibandingkan sintering konvensional. Densitas bulk komposit mencapai 4,84 g/cm³ dan kekerasan maksimum 12,2 GPa untuk komposit a-ZrO₂/Al₂O₃ yang disinter SPS pada 1300°C, 40 MPa. Pengujian elektrokimia menunjukkan pembentukan lapisan pasif yang stabil, dengan peningkatan resistansi korosi (R_cor) dan penurunan aktivasi elektrokimia pori (Q_pore), serta nilai I_corr menurun drastis hingga mencapai 4,81×10⁻⁸ A/cm². Penggunaan bahan lokal pasir zirkon serta optimalisasi material dasar dan sintering untuk menghasilkan komposit keramik dengan ketahanan korosi dan sifat mekanik unggul menunjukkan potensi dalam pengembangan material gigi berbasis sumber daya alam Indonesia.
================================================================================================================================
The utilization of local natural resources as raw materials for functional materials holds significant potential in reducing dependency on imported materials. This study aimed to synthesize and characterize polymorphic (amorphous and tetragonal) ZrO₂/Al₂O₃ composites and ZrSiO₄/Al₂O₃ composites derived from natural zircon sand from Kalimantan, serving as sources of zirconia and zircon. The zircon powder was purified and converted into ZrO₂ via the alkali fusion method, then combined with Al₂O₃ and sintered using both conventional methods (1200–1300 °C for 3–7 hours) and spark plasma sintering (SPS) (40–80 MPa for 10 minutes). XRD analysis confirmed the formation of zircon, corundum, tetragonal and monoclinic zirconia phases, as well as mullite. SEM images revealed that SPS facilitated more intensive interparticle diffusion compared to conventional sintering. The bulk density of the composites reached up to 4.84 g/cm³, with a maximum hardness of 12.25 GPa achieved by the a-ZrO₂/Al₂O₃ composite sintered via SPS at 1300 °C and 40 MPa. Electrochemical testing indicated the formation of a stable passive layer, characterized by increased corrosion resistance (R_cor), decreased electrochemical pore activation (Q_pore), and a significant reduction in corrosion current density (I_corr), reaching as low as 4.81×10⁻⁸ A/cm². The use of locally sourced zircon sand, along with the optimization of base materials and sintering parameters, demonstrates the potential of developing ceramic composites with superior corrosion resistance and mechanical performance for dental applications based on Indonesia's natural resources.

Item Type:	Thesis (Doctoral)
Uncontrolled Keywords:	komposit ZrO2/Al2O3, struktur, sifat mekanik, sifat termal, sifat elektrokimia, gigi tiruan, ZrO2/Al2O3 composites, structural, mechanical, and electrochemistry properties.
Subjects:	Q Science > QC Physics > QC173.4.C63 Composite materials
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45001-(S3) PhD Thesis
Depositing User:	Cahyaning Fajar Kresna Murti
Date Deposited:	19 Aug 2025 01:02
Last Modified:	19 Aug 2025 01:02
URI:	http://repository.its.ac.id/id/eprint/128131

Actions (login required)

View Item