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Pengaruh penambahan sodium dodecyl benzene sulphonate sebagai surfaktan terhadap konduktivitas termal nanofluida berbasis carbon nanotubes sebagai media quench pada proses perlakuan panas baja S45C = The effect of sodium dodecyl benzene sulphonate addition as surfactant on the thermal conductivity of carbon nanotubes-based nanofluid as quenchant in the heat treatment process of S45C Steel

Diffa Sthasyant Nauvalin; Wahyuaji Narottama Putra, supervisor; Myrna Ariati Mochtar, examiner; Azizah Intan Pangesty, supervisor (Fakultas Teknik Universitas Indonesia, 2021)

 Abstrak

Quenchant dengan konduktivitas termal tinggi dapat meningkatkan laju
pendinginan, sehingga didapat hasil perlakuan panas dengan sifat mekanis yang lebih
baik. Salah satu cara meningkatkan konduktivitas termal adalah dengan membuat
nanofluida. Pada penelitian ini, digunakan nanopartikel berupa Multi-walled Carbon
Nanotubes (MWCNT) as-received. Nanofluida berbasis CNT disintesis menggunakan
metode dua tahap. CNT dengan konsentrasi sebesar 0,1%, 0,3%, dan 0,5%
didispersikan pada fluida dasar berupa air distilasi. Untuk meningkatkan stabilitas
nanofluida, ditambahkan surfaktan Sodium Dodecyl Benzene Sulphonate (SDBS)
sebanyak 3%, 5%, dan 7% serta dilakukan ultrasonikasi selama 15 menit. Nanofluida
tersebut digunakan sebagai quenchant dengan lama imersi 4 menit untuk proses
perlakuan panas baja S45C dengan temperatur austenisasi sebesar 900˚C. Hasil
penelitian menunjukkan bahwa konduktivitas termal nanofluida meningkat seiring
dengan penambahan konsentrasi CNT, kecuali pada sampel tanpa penambahan
surfaktan. Seiring penambahan surfaktan, konduktivitas termal meningkat hingga
mencapai kadar optimum dan kemudian menurun, kecuali pada sampel dengan
penambahan surfaktan sebanyak 3%. Nilai kekerasan baja S45C hasil quenching tidak
dipengaruhi secara linear oleh konduktivitas termal quenchant.

Quenchant with high thermal conductivity could increase the cooling rate;
hence heat treatment results with better mechanical properties are obtained. One
method to increase the thermal conductivity is by creating nanofluids. In this study,
Multi-walled Carbon Nanotubes (MWCNT) as-received were used as nanoparticles.
The CNT-based nanofluids were synthesized using the two-step method. CNTs with
concentrations of 0.1%, 0.3%, and 0.5% were dispersed to the base fluid, distilled
water. To increase the stability of the nanofluids, Sodium Dodecyl Benzene Sulphonate
(SDBS) surfactants as much as 3%, 5%, and 7% were added; further, ultrasonication
was carried out for 15 minutes. The nanofluids were used as quenchants with an
immersion time of 4 minutes for the heat treatment process of S45C steel with an
austenitizing temperature of 900˚C. The results showed that the thermal conductivity of
nanofluids increased with the addition of CNT concentration, except for samples
without the addition of surfactants. On the other side, as more surfactants were added,
the thermal conductivity increased until it reached the optimum level and then
decreased, except for samples with 3% surfactant. The hardness values of quenched
S45C steels are not linearly affected by the thermal conductivity of the quenchants.

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 Metadata

Jenis Koleksi : UI - Skripsi Membership
No. Panggil : S-pdf
Entri utama-Nama orang :
Entri tambahan-Nama orang :
Entri tambahan-Nama badan :
Program Studi :
Subjek :
Penerbitan : Depok: Fakultas Teknik Universitas Indonesia, 2021
Bahasa : ind
Sumber Pengatalogan : LibUI ind rda
Tipe Konten : text
Tipe Media : computer
Tipe Carrier : online resource
Deskripsi Fisik : xix, 65 pages : illustration ; appendix
Naskah Ringkas :
Lembaga Pemilik : Universitas Indonesia
Lokasi : Perpustakaan UI
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S-pdf 14-22-67267107 TERSEDIA
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