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All Journal Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Rekayasa Mesin Jurnal Pengabdian UntukMu NegeRI Jurnal Pemberdayaan Masyarakat Madani (JPMM) Jurnal Surya Teknika Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Journal of Material Processing and Characterization (JMPC) Teknologika Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Proksima BATOBO: Jurnal Pengabdian Kepada Masyarakat Jurnal Polimesin
Dedy Masnur, Dedy
Universitas Riau
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Journal : Jurnal Polimesin

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The Influence of Al-Ti-B on the microstructure of unidirectionally solidified Al-10wt.%Cu-10wt.%Si Masnur, Dedy; Malau, Viktor; suyitno, Suyitno
Jurnal Polimesin Vol 22, No 4 (2024): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i4.5234

Abstract

Many works have reported the role of grain refiners in aluminumsilicon alloy casting in direct chill casting. However, only a few are under the unidirectional solidification condition. Direct chill casting favors equiaxed structures, while unidirectional solidification favors columnar structures. This work investigated the influence of Al-Ti-B on the microstructure of unidirectionally solidified Al-10wt.%Cu-10wt.%Si. The samples were directionally solidified using the Bridgman apparatus. It was cooled at the bottom to a temperature of 650℃, and the temperatures were recorded during the cooling. A representation of the cooling curve was selected, and the solidification parameters were calculated. Metallographic procedures were applied to observe the microstructure across the sample length. The results show that the 0.03wt.%Ti effectively promotes nucleation in many sites. It leads to the formation of equiaxed structures and prevents fine columnar structures from further growth. Due to the magnitude of the cooling rate, the 0.03wt.%Ti exhibits fine columnar, fine equiaxed, coarse equiaxed, and dendrite equiaxed structures at the separated distance from the contact area. This formation is in line with the one produced by the mechanism in direct chill casting. Understanding the grain refiner effect is crucial for optimizing manufacturing processes and achieving desired material properties. The Al-Ti-B addition is not recommended in the propeller manufacturing industry.
Microcellulose From Pineapple Leaf Fiber as a PotentialSustainable Material: Extraction And Characterization Nawangsari, Putri; Fatra, Warman; Kusuma, Aryandi; Badri, Muftil; P.C1, Dedi Rosa; Masnur, Dedy
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4522

Abstract

Pineapple leaf fiber is consideredan agricultural waste during the harvesting process. Pineapple leaves are rich in cellulose, which made it applicable in many industrial applications. This study aims to extract and characterize microcellulose from pineapple leaf waste in Kampar district, Riau. Pineapple fibers were isolated by alkalization (5 % NaOH) at 70 ºC for 150 minutes, followed by bleaching treatment(3% H2O2) at 60°C for 60minutes. Microcellulosewascharacterized through various techniques, namely chemical composition analysis, Fourier transform analysis (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (DT/TGA). The results reveal that the extractedmicrocellulose has significantcellulose content (72.45%) with a crystallinity index of 73.48%. The FTIR spectra of microcellulose indicatethat alkalization and bleaching treatments removed lignin and hemicellulose in varying degrees. Moreover, the extracted microcelluloseshows high thermal stability, the maximum decompositionoccurredat 347 ºC (weight residue 16.37%).Pineappleleaf fiber in Kampar district, Riau, can be a source of microcellulose as a renewable, eco-friendly, and sustainable material for future industrial applications. 
Co-Authors Abdul Rahman Adri Adri Andi Putra Andri Andri Anggria, Feldy Anita Susilawati Anuar, Kaspul Asrian, Angga Awaludin Martin Azis, Azridjal Buma Gempa Skp, Buma Gempa Dea Musyafiroh Akbar Eko Saputra Erwin Ardiansyah Feblil Huda Gunawan, Gilang Harrianda Hudaya Harrianda Hudaya Herisiswanto Herisiswanto Indra Jun Noturas Irdoni HS Kusuma, Aryandi Latif Kuncoro Wasmi Apris M Dalil Muftil Badri Muttaqien, Muhammad Fadhlurrahman ‘Arif N. Nazaruddin N. Nazaruddin Nazaruddin Nazaruddin Oktary, Dian P.C1, Dedi Rosa Patiharauw, Frans Boyce Pernando Sihite Pernando Sihite, Pernando Putra Cupu, Dedi Rosa Putri Nawangsari Putri Nawangsari Putri Nawangsari Putri Nawangsari, Putri Putri Nawangsari, Putri Nawangsari Rahmadiza, Duta Rahmat Rosandi Rasyad, Abdur Ridwan Abdurrahman Rochman Saefudin Romy Romy Romy Seab Piseth Suyitno Suyitno Syafri Syafri, Syafri Viktor Malau Warman Fatra, Warman Yohanes