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All Journal Mekanika: Majalah Ilmiah Mekanika Journal of Metallurgical Engineering and Processing Technology
Anton Sudiyanto
Universitas Pembangunan Nasional "Veteran" Yogyakarta
Chemical Engineering, Chemistry & Bioengineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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ANALISIS KUALITAS TERHADAP BATUGAMPING QUARRY HINGGA TEPUNG KALSIUM KARBONAT HASIL PRODUKSI DI PT. SUGIH ALAMANUGROHO Monika Asworo; Tri Wahyuningsih; Anton Sudiyanto; Olivia Silvi Hermanto; Meindra Setyawan
Journal of Metallurgical Engineering and Processing Technology Vol 3, No 1 (August 2022)
Publisher : UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v3i1.7038

Abstract

Limestone is a rock belonging to the type of sedimentary rock, formed as a result of a natural sedimentation process. Limestone is a type of non-metallic mineral that is used in various sectors, such as in the paint industry, glass industry, plastics, paper industry, liming on agricultural land and is also used in the metal smelting industry. Limestone products produced by PT. Sugih Alamanugroho is in the form of calcium carbonate flour (powder) with sizes of 800 and 1,200 mesh. Before being marketed, calcium flour will go through a series of quality analysis processes to determine moisture content, degree of whiteness and residual weight (+800 mesh). The water content test was analyzed using an infrared moisture determination balance tool, aiming to find out what percentage of the water content contained in limestone and calcium carbonate flour. The degree of whiteness was analyzed using a reflectometer. Residual testing was carried out by weight pf the residue after the drying process was carried out in the oven. Based on the data, the calcium carbonate flour produced has passed the quality test, with a moisture content <0.03%, a whiteness degree >89.6% and a residual weight (+800 mesh) <0.05% in accordance with the quality standards of limestone and calcium flour. carbonates that have been determined by the company. So that the packaging and marketing process can then be carried out.Keywords: Limestone, Calcium Carbonate Flour, Moisture, Whiteness, Residue Weight
Mechanical Properties Of Pack Carburized AISI 4340 With Variation Energizer Composition of Barium Carbonate (BaCO3) And Sodium Carbonate (Na2CO3) Agris Setiawan; Sapna Yusmania; Anton Sudiyanto
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 1 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i1.63870

Abstract

This research aimed to determine the mechanical strength of American Iron and Steel Institute (AISI) 4340 steel after pack carburizing with a combined variation of barium carbonate (BaCO3) and sodium carbonate (Na2CO3) as an energizer. Combination of two variations of energizer materials as an alternative to improve mechanical properties. The various ratios of energizer: 40/60, 50/50, and 60/40% w/w. The mechanical test was conducted to determine tensile (American Society for Testing and Material-ASTM E-8), impact strength (ASTM E-23), Rockwell hardness (ASTM E-18), and microstructure characterization (ASTM E-3). Both type specimens were temperature pack carburized was 950 ℃, and the holding time was 3 hours. Results showed that Specimen C had the lowest ultimate tensile strength mean value of the other specimens, which was 333.43±30.22 MPa. The impact test results showed that the lowest impact energy value was found in Specimen C, which is 4.32 Joules, and the highest impact energy value was found in specimens without treatment, which was 15.80 Joules. The microscope observation indicated that the specimen's microstructure was martensite structure increase, and the results of the hardness test were influenced by the martensite phase.
Co-Authors Agris Setiawan Meindra Setyawan Monika Asworo Olivia Silvi Hermanto Sapna Yusmania Tri Wahyuningsih