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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

The aim of this research was to determine the mechanical strength of AISI 4340 steel after pack carburizing with variation of barium carbonate (BaCO3) and sodium carbonate (Na2CO3) as energizer. The various ratios of energizer: 40/60, 50/50 and 60/40 w/w%. Mechanical test was conducted to determine tensile (ASTM E-8), impact charpy strength (ASTM E-23), rockwell hardness number (ASTM E-18) and microstructure characterization (ASTM E-3). Both type specimens were temperature pack carburized is 950ºC and holding time is 3 hours.  Results showed that specimen C has a lowest ultimate tensile strength mean values than the other specimens, which is 333.43±30.22 MPa. The results of the impact test showed that the lowest impact energy value is found in specimen C, which is 4.32 joules and the highest impact energy value is found in specimens without treatment, which is 15.80 joules. Based on microscope observation indicated that microstructure of specimen was martensite structure increase and the results of the hardness test was influenced by martensite phase, specimen C has the highest hardness compared to other specimens, which is 80.70 HRC while the untreated specimen is 56.90 HRC.
Co-Authors Agris Setiawan Meindra Setyawan Monika Asworo Olivia Silvi Hermanto Sapna Yusmania Tri Wahyuningsih