Analisis Pengaruh Penambahan MgO Dan Suhu Sintering Terhadap Perubahan Fasa Dan Mikrostruktur Pada Castable Alumina Komersial

Rafiq, Hafidz Ainnur (2026) Analisis Pengaruh Penambahan MgO Dan Suhu Sintering Terhadap Perubahan Fasa Dan Mikrostruktur Pada Castable Alumina Komersial. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Castable alumina komersial merupakan material refraktori yang dapat dimodifikasi dengan penambahan MgO untuk mendorong pembentukan magnesium aluminate spinel (MgAl₂O₄). Penelitian ini bertujuan menganalisis pengaruh penambahan MgO dan suhu sintering terhadap perkembangan fasa dan mikrostruktur castable alumina komersial sebelum dan sesudah karbonasi. MgO ditambahkan sebesar 2%, 4%, dan 6% terhadap massa castable. Sampel menjalani curing selama 24 jam, pengeringan pada 110°C selama 24 jam, serta sintering pada 700°C dan 1200°C selama 2 jam. Karbonasi dilakukan pada 350°C selama 2 jam dengan laju alir CO₂ sebesar 50–70 mL/menit. Karakterisasi dilakukan menggunakan XRF, XRD, SEM–EDS, dan TGA. Hasil XRF menunjukkan bahwa material didominasi oleh Al₂O₃ sebesar 61,84%, disertai SiO₂ sebesar 15,40%, MgO sebesar 13,94%, dan CaO sebesar 4,69%. Hasil XRD menunjukkan bahwa α-Al₂O₃ tetap menjadi fasa dominan, sedangkan MgO dan MgAl₂O₄ teridentifikasi pada seluruh variasi. Kecocokan puncak MgAl₂O₄ terlihat lebih jelas pada suhu 1200°C. Setelah karbonasi, terdapat indikasi MgCO₃ terutama pada 2θ sekitar 32,5° dan 53,6°–53,8°. Mikrograf SEM sampel MgO 4% menunjukkan morfologi yang lebih partikulat pada 700°C dan matriks yang lebih terhubung pada beberapa area pada 1200°C. EDS mendeteksi Mg dan C secara lokal pada kedua sampel. Pada rentang TGA 336–500°C, sampel 700°C menunjukkan kehilangan massa semu sebesar 0,2139% atau 2,139 mg/g, sedangkan sampel 1200°C sebesar 0,00683% atau 0,0683 mg/g. Hasil penelitian menunjukkan bahwa peningkatan suhu sintering mendorong perkembangan MgAl₂O₄, tetapi menurunkan respons termal pascakarbonasi dari komponen magnesium yang tersisa.
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Commercial alumina castable is a refractory material that can be modified by MgO addition to promote the formation of magnesium aluminate spinel (MgAl₂O₄). This study investigated the effects of MgO addition and sintering temperature on the phase evolution and microstructure of commercial alumina castable before and after carbonation. MgO was added at 2%, 4%, and 6% of the castable mass. The specimens were cured for 24 h, dried at 110°C for 24 h, and sintered at 700°C and 1200°C for 2 h. Carbonation was conducted at 350°C for 2 h under a continuous CO₂ flow rate of 50–70 mL/min. The samples were characterized using XRF, XRD, SEM–EDS, and TGA. XRF analysis showed that the material mainly contained 61.84% Al₂O₃, 15.40% SiO₂, 13.94% MgO, and 4.69% CaO. XRD results indicated that α-Al₂O₃ remained the dominant phase, while MgO and MgAl₂O₄ were identified in all sample variations. MgAl₂O₄ peak matching was more pronounced at 1200°C. After carbonation, MgCO₃ was indicated mainly by peak matching at approximately 2θ = 32.5° and 53.6°–53.8°. SEM micrographs of the 4% MgO samples showed a more particulate morphology at 700°C and a more interconnected matrix in several regions at 1200°C. EDS locally detected Mg and C in both samples. Within the TGA range of 336–500°C, the 700°C sample exhibited an apparent mass loss of 0.2139%, equivalent to 2.139 mg/g, whereas the 1200°C sample showed 0.00683%, equivalent to 0.0683 mg/g. The results indicate that increasing the sintering temperature promoted MgAl₂O₄ development but reduced the post-carbonation thermal response of the remaining magnesium-containing components.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	castable alumina, magnesium oksida, MgAl₂O₄, karbonasi, mikrostruktur, TGA, alumina castable, magnesium oxide, carbonation, microstructure
Subjects:	T Technology > TS Manufactures T Technology > TS Manufactures > TS161 Materials management.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Hafidz Ainnur Rafiq
Date Deposited:	24 Jul 2026 15:41
Last Modified:	24 Jul 2026 15:41
URI:	http://repository.its.ac.id/id/eprint/137469

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