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All Journal Journal of Mechanical Engineering Science and Technology INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Jurnal Bakti Masyarakat Manajemen Bhinneka Multidisiplin Journal
Tumpal Ojahan Rajagukguk
mahasiswa pasca sarjana program studi mesin fakultas teknik unsri
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Optimization of Stir Casting of Aluminum Matrix Composites (AMCs) with Filler of Recycled Glass Powder (RGP) for The Mechanical Properties Hendronursito, Yusup; Rajagukguk, Tumpal Ojahan; Anshori, Anang; Yunanto, Asep
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 4, No 2 (2020)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v4i22020p101

Abstract

A study of making Aluminum Matrix Composites (AMCs) uses recycled glass powder (RGP) as a filler has been carried out through the stir casting process. The experimental design uses the Taguchi method of 3^3 orthogonal array L9 with the parameters of powder size (20>x> 80, 80>y> 200, 200>z> 325), percentage of filler vs matrix (2%, 7%, 12%), and stirring time (30 Seconds, 3 Minutes, 12 Minutes). The optimum conditions for the hardness of Al-GRp composites were obtained from specimens with Mesh powder size parameters 200> z> 325, the percentage of glass vs aluminum powder was 12% wt, stirring time was 12 minutes. The experimental factor that has the greatest contribution to the hardness value of Al-GRP composites is the size of glass powder of 73.77%, followed by the percentage of glass powder to aluminum by 19.98%, and the stirring time of 1.21%. The optimum experimental parameters for tensile strength can be obtained from specimens with particle size parameters of 20> x> 80, the percentage of glass powder to the weight of aluminum 12%, and the stirring time of 30 seconds. The biggest contribution to the tensile strength value of the Al-GRP composite was the stirring time of 72.71%, followed by the percentage of glass powder to aluminum by 13.67%, and the size of the powder was 9.97%.
PELATIHAN DASAR TEKNIK PENGELASAN SHIELDED METAL ARC WELDING (SMAW) BAGI WARGA UNIVERSITAS MALAHAYATI UNTUK PENINGKATAN KEMAMPUAN SDM TERAMPIL Marjuni, Teuku; Rajagukguk, Tumpal Ojahan; Ibrahim, Fauzi; Ansyori, Anang; Prastyo, Adi; Hadi, Agung Efriyo
Jurnal Bakti Masyarakat Manajemen Vol 3, No 2 (2023): Volume 3 Nomor 2 Tahun 2023
Publisher : Program Studi Manajemen Fakultas Ekonomi dan Manajemen Universitas Malahayati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jbmm.v4i1.16259

Abstract

Teknik pengelasan SMAW merupakan jenis pengelasan sederhana yang sering dimanfaatkan oleh Sebagian warga untuk menyambungkan berbagai jenis logam. Hingga saat ini Teknik pengelasan SMAW digunakan untuk kegiatan sehari – hari maupun mata pencaharian utama bagi masyarakat luas. Peluang penerapan jenis pengelasan ini akan menunjang produktifitas warga secara efisien. Potensi maupun bakat yang dimiliki setiap orang berbeda ketika melakukan pengelasan. Pelatihan Teknik pengelasan SMAW bagi warga dan mahasiswa muda universitas malahayati ini akan digunakan sebagai tutor serta peningkatan SDM terampil.
STUDI KASUS MORFOLOGI NANOFIBER POLIVINIL ALKOHOL (PVA) TERHADAP HIDROFOBISITAS PERMUKAAN YANG DINILAI DENGAN PENGUKURAN SUDUT KONTAK Berly, Yoga Maharesha; Rajagukguk, Tumpal Ojahan; Hendronursito, Yusup
Bhinneka Multidisiplin Journal Vol. 2 No. 4 (2025): Bhinneka Multidisiplin Journal
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/bmj.v2i4.71

Abstract

Nanofiber is a fiber measuring nanometers to micrometers, often used in the medical, energy, filtration, and other fields. The formation of nanofiber with the main ingredient, namely Polyvinyl Alcohol (PVA), this is because of its biodegradable, biocompatible, and chemically stable properties, but has the weakness of being easily degraded when in contact with water. This study examines the effect of electrospinning parameters on the morphology of 10% w/v PVA nanofiber, with parameters namely voltage of 10 and 12 kV, nozzle-collector distance of 10 and 15 cm. Morphological testing was carried out using a Field Emission-Scanning Electron Microscope (FE-SEM) and Contact Angle (CA) test. The test results show that PVA nanofiber has a fiber diameter with a value of NFZ.1; 80 - 406 nm, NFZ.2; 61.7 - 248.9 nm, with a continuous fiber structure and without significant defects, the resulting contact angle value of NFZ.1; 50.05o and NFZ.2; 38.75o, the contact angle value of NFZ.1 is higher than NFZ.2. The nanofiber with the smallest diameter is NFZ.2 and the largest contact angle value is NFZ.1. The results of this research show that the morphology of nanofiber significantly influences the contact angle value.
Karakterisasi Thermal dan Ketahanan Sifat Kimia Refraktori Bata Tahan Api Berbasis Alumina Herdianton, Hecci; Rajagukguk, Tumpal Ojahan; Candra Birawidha, David; Marjuni, Teuku
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 11, No 2 (2025): Oktober
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v11i2.11501

Abstract

Bata tahan api memiliki peran penting pada dunia Industri seperti industri pengecoran, boiler, inchinerator serta industri lainnya, yang mengalami proses pemanasan pada temperatur tinggi untuk menunjang dan mendorong produktivitas produksi. Bata tahan api yang terkena siklus pembakaran yang terus berulang didalam ruang kerja, sedikit demi sedikit mulai mengalami deformasi volume yang disebabkan stres termal (thermal shock resistance) dan terkena sifat kimia dari cairan seperti terak (slag), deformasi yang  terjadi terus menerus dapat mengakibatkan retak bahkan hancurnya bata tahan api. Penelitian ini bertujuan untuk mendapatkan karakterisasi thermal serta ketahanan sifat kimia pada  bata tahan api. Variabel penelitian memvariasikan komposisi  kaolin, alumina, dan chamotte, V1(K20%, A30%, C50%), V2(K15%, A35%, C50%), V3(K10%, A40%, C50%) dimana setiap variasi dibakar pada temperatur 1200℃. Hasil pengujian analisis karakterisasi  STA dengan perlakuan temperatur 1400℃ terhadap semua sampel, bata tahan api mengalami tranformasi fasa Mullite pada temperatur  1200℃. Pada analisis ketahanan sifat kimia dengan perlakuan temperatur 1150℃ pada bata tahan api secara pengamatan visual diketahui, bata tahan api bereaksi atau terkonsumsi larutan basa natrium hidroksida (NaOH). Berdasarkan hasil penelitian bata tahan api berbasis alumina memiliki kemampuan dominan menahan sifat kimia terhadap serangan sifat asam sulfat (H2SO4), sedangkan karakteristik thermal menghasilkan transformasi fasa Mullite pada temperatur 1200℃ terhadap sampel V3.
PENGARUH TEMPERATUR SINTERING KAOLIN PADA BATA TAHAN API TERHADAP UJI DENSITAS, POROSITAS DAN KUAT TEKAN Ahmiyati, Yusniar; Rajagukguk, Tumpal Ojahan
Bhinneka Multidisiplin Journal Vol. 3 No. 2 (2026): Bhinneka Multidisiplin Journal
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/bmj.v3i2.109

Abstract

Fire bricks possess the ability to withstand high temperatures; however, repeated use beyond their capacity can lead to failure. As construction materials, fire bricks maintain their shape and strength at extremely high temperatures. Kaolin is a natural mineral belonging to the clay group, with kaolinite as its primary constituent. The decomposition of kaolinite into metakaolinite occurs between 400 and 630°C, and metakaolin gradually promotes the formation of mullite crystals. Alumina is one of the most widely used raw materials in refractory applications due to its high heat resistance, as well as its resistance to erosion and corrosion. This study aims to analyze fire bricks produced by sintering kaolin at 700°C, while varying the compositions of kaolin, alumina, and chamotte, followed by firing at 1300°C. Density test results indicate that Sample 3 yielded the best value of 2.14 g/cm³. Porosity test results show that Sample 3 achieved the optimal value of 16.4%. Compressive strength test results demonstrate that Sample 3 produced the highest value of 34.79 N/mm². This research has the potential to serve as an alternative solution for developing fire bricks applicable in the petrochemical industry, iron and steel production, boilers, power plants, ceramics, glass, and other sectors.
Optimizing the Composition of Basalt and Heat Treatment of Fly Ash-Based Mullite Ceramics Using the Taguchi Method Rajagukguk, Tumpal Ojahan; Ansori, Anang; Ardiyansyah, Ferdy -; Hendronursito, Yusup
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 14, No 1 (2024): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v14i1.76472

Abstract

The development of industrial activities has an impact on the increase in waste produced, and fly ash, aluminum dross, and basalt dust are no exception. This research studies the potential of these three materials as ceramic materials. Basalt dust from East Lampung was used as filler. The effect on the physical and mechanical properties of mullite (3Al2O3-2SiO2) ceramics was studied. The manufacture of mullite ceramics based on Taguchi design includes fly ash compositions of 40%, 50%, and 60% and basalt content of 0%, 5%, and 10%. sintering temperatures of 600°C, 900°C, and 1,200°C. Taguchi and Anova were used to determine the effect of independent variables on hardness and density. In addition, macro and microphoto tests were carried out to determine the physical and topographic changes of mullite ceramics. Chemical composition tests with X-ray fluorescence were carried out on raw materials and ceramics that have been formed. Changes in the crystal phase in mullite ceramics were studied through the X-ray diffragment test. XRF test results obtained for raw fly ash (SiO2 + Al2O3 + Fe2O3): 84.84 wt%. The composition of raw basalt is predominantly 48.42% SiO2, 18.82% Al2O3, 12.60% Fe2O3, and raw aluminum dross with 67.821% Al2O3 content. The mullite ceramic specimen consists of 38.24–45.30% SiO2, 34.72–48.73% Al2O3, 6.3–9.99% Fe2O3, and 2.31–5.31% CaO. The crystal phases formed are mullite, pyroxene, and diopside. Analysis of variance shows that hardness is significantly affected by sintering temperature, with a P-value of 0.013 and a contribution of 93.77%. This modeling is acceptable with an error value of 1.26%, or R-sq: 98.74%. The addition of basalt increases the density of mullite ceramics, with a P-value of 0.033 and a contribution of 96.05%. The addition of basalt as a filler is not able to increase the hardness significantly, but it affects the higher ceramic density value. However, the formation of mullite is interesting to study further as a refractory material
Co-Authors Ahmiyati, Yusniar Anang Ansyori Anshori, Anang Ansori, Anang Ardiyansyah, Ferdy - Berly, Yoga Maharesha Candra Birawidha, David Hadi, Agung Efriyo Herdianton, Hecci Ibrahim, Fauzi Marjuni, Teuku Prastyo, Adi Yunanto, Asep Yusup Hendronursito, Yusup