Ardiansyah, Deni and , Patna Partono, S.T., M.T. (2024) Studi Variasi Penambahan Unsur Tembaga (Cu) Terhadap Penyusutan, Komposisi Kimia, Density, Kekerasan, dan Struktur Mikro Pada Pengecoran Logam Alumunium Dalam Proses Investment Casting. Skripsi thesis, Universitas Muhammadiyah Surakarta.
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Abstract
Investment casting is a method of manufacturing precision metal components using a fusible mold, copper alloy aluminum has advantages due to its high mechanical properties and corrosion resistance. This process is carried out using wax coated with gypsum, then leaving a cavity for casting metal. Investment casting has the advantage that it can produce high precision results and accurate shapes. The purpose of this study is to determine the effect of variations in the addition of copper elements on shrinkage, chemical composition, density, hardness, and microstructure. This research begins with a literature study, preparation of tools and materials, preparation of investment casting, casting, until the testing process which includes testing shrinkage, chemical composition, density, hardness, and microstructure. The test results obtained, there is a length shrinkage in specimen 1 0% variation of 0.8611 mm, in specimen 2 5% variation of 0.8494 mm, in specimen 3 10% variation of 0.8463 mm. In area shrinkage in specimen 1 0% variation amounted to 39.4376 mm2, in specimen 2 5% variation amounted to 38.6971mm2, in specimen 3 10% variation amounted to 37.4387 mm2 In volume shrinkage in specimen 1 0% variation amounted to 683.2565 mm3 in specimen 2 5% variation amounted to 683.1970 mm3, in specimen 3 10% variation amounted to 679.7142 mm3. While in the percentage of shrinkage there is a value in specimen 1 0% variation of 3.04%, in specimen 2 5% variation of 2.08%, in specimen 3 10% variation of 1.20%. The results of Chemical Composition Testing in specimen 1 0% variation contains copper powder (Cu) of 0.287%, in specimen 2 5% variation of copper powder addition (Cu) of 0.833%, in specimen 3 10% variation of copper powder addition (Cu) of 0.756%. The results of density testing on specimen 1 0% variation obtained the results of 2.71 g/cm3, on specimen 2 5% variation of copper powder addition (Cu) obtained the results of 2.85 g/cm3, on specimen 2 5% variation of copper powder addition (Cu) obtained the results of 2.97 g/cm3. The results of hardness testing on specimen 1 variation of adding copper powder (Cu) 0% of 7.31 VHN, on specimen 2 variation of adding copper powder (Cu) 5% of 7.62 VHN, on specimen 3 variation of adding copper powder (Cu) 10% of 6.54 VHN. The results of microstructure testing show that each variation has elements that bind together such as Cu-Mg-Al which consists of a network of spots that spread evenly, CuMgAl2which is shaped like a directed tree branching with a gray color. Cu2FeAl7 which is in the form of elongated blades with a medium gray color. Cu2Mg8Si6Al5 which is shaped like a script / script with a light gray color. Cu3NiAl6 which is shaped like a script and is light gray in color. Al is the lightest and most abundant gray.
| Item Type: | Thesis (Skripsi) |
|---|---|
| Uncontrolled Keywords: | Investment Casting, Aluminum, Copper, Shrinkage, Chemical Composition, Density, Hardness, Microstructure |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | DENI ARDIANSYAH |
| Date Deposited: | 15 Nov 2024 07:16 |
| Last Modified: | 15 Nov 2024 07:16 |
| URI: | http://eprints.ums.ac.id/id/eprint/128827 |
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