Analisis Pengaruh Agregat Al2O3 dan Modulus Distribusi Ukuran Partikel Terhadap Sifat Fisik dan Sifat Thermal Refraktori Castable SiC

Putra, Tio Agathama (2018) Analisis Pengaruh Agregat Al2O3 dan Modulus Distribusi Ukuran Partikel Terhadap Sifat Fisik dan Sifat Thermal Refraktori Castable SiC. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Refraktori merupakan bahan yang tahan terhadap panas dan mempertahankan stabilitas fisik dan kimia yang cukup untuk tujuan struktural saat mereka terkena lingkungan dengan suhu tinggi. Salah satu refraktori monolitik yang banyak digunakan di industri yaitu castable. Sering juga disebut beton tahan api. Refraktori castable tersusun dari bahan refraktori berupa butiran serbuk mineral (agregat) yang ukuran butir dan distribusi butirannya bervariasi yang dicampur dengan biner (bahan perekat) dengan atau tanpa ditambah aditif. Salah satu contoh penggunaan refraktori castable di sistem pambangkit yaitu water wall tube. Shock termal dan thermal cycling biasa terjadi sini, sehingga refraktori castable silicon karbida digunakan di daerah ini karena ketahanan abrasi yang sangat baik pada suhu pembakaran yang tinggi. Maka dari itu refraktori castable SiC berfungsi sebagai pelapis agar material water wall tube tidak rusak dan ikut meleleh pada saat beroperasi. Perancangan percobaan dilakukan dengan metode faktorial berupa dua faktor tiga level. Faktor pertama merupakan komposisi refraktori castable terdiri dari berbagai distribusi ukuran partikel ditentukan berdasarkan metode Dinger Funk untuk distribusi kontinyu dengan level modulus distribusi ukuran butiran (q) sebesar 0.21, 0.23 dan 0.25. Faktor kedua adalah agregat Al2O3 yang didapatkan dari variasi jenis agregat yaitu mullite, bauxite, dan white fuse alumina. Pembuat spesimen uji terdapat dua tahap pembuatan refraktori castable, yaitu proses pengayakan dan proses pengecoran. Dimana spesimen yang dibuat berupa kubus (50x50x50mm) untuk pengujian bulk density, porositas dan cold crushing strenght sedangkan tabung (d=40mm dan t=50mm) untuk pengujian thermal konduktivity. Dari penelitian ini didapatkan hasil bahwa semakin tinggi modulus distribusi ukuran butiran dapat meningkatkan bulk density, cold crushing strength dan konduktivitas panas tetapi porositas semakin turun dari castable SiC. Untuk SiC dengan agregat White fuse alumina menghasilan bulk density, cold crushing strength dan konduktivitas panas tertinggi dibandingkan bauxite dan mullite terendah. Untuk porositas mullite memiliki nilai tertinggi dan white fuse alumina terendah. ============== Refractory is material that is resistant to the heat and maintains the physical and chemical stability for the structural purpose when they are in the high temperature environment. One of the monolithic refractories that is often used by industries is castable. It is also called fire resistant concrete. Refractory castable consists of refractory material in the form of mineral powder grain (aggregate) in which the grain size has variations that are mixed with binary (adhesive material) and with or without being added additives. One of the refractory castable usages in the generation system is used in this area because abrasion endurance is very good at the high burning temperature. Because of that, SiC refractory castable has a purpose as the layer, so water wall tube material will not get damaged and melted when operate. Specimen planning is done by using factorial method in the form of two factors three levels. The first factor is the composition of refractory castable that contains various size particle distributions determined based on Dinger Funk method for the continual distribution with grain-size modulus in the amount of 0.21, 0.23, and 0.25. The second factor is aggregate AI2O3 that is got from the variations in aggregate type, they are mullite, bauxite, and white fuse alumina. Test specimen maker had two refractory castable making steps, they are sifting and casting process, in which the specimen made in the form of cube (50x50x50mm) for bulk density and cold crushing test, whereas tube (d=40mm and t=50mm) for thermal conductivity test. From this research, it has been got the result that the higher modulus distribution of grain size will increase the bulk density, cold crushing strength, and thermal conductivity, but the porosity is lower than SiC castable. For SiC with aggregate, white fuse alumina results bulk density, cold crushing strength and the highest thermal conductivity than the lowest bauxite and mullite. For the porosity, mullite has the highest result, and white fuse alumina has the lowest result.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: refraktori; castable; SiC; refractory
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking
T Technology > TA Engineering (General). Civil engineering (General) > TA441 Aggregates
T Technology > TS Manufactures > TS253 Die-Casting
Divisions: Faculty of Industrial Technology > Mechanical Engineering > (S1) Undergraduate Theses
Depositing User: Putra Tio Agathama
Date Deposited: 26 Mar 2018 04:36
Last Modified: 26 Mar 2018 04:36
URI: http://repository.its.ac.id/id/eprint/50687

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