Khoiruddin, Sukhoiri and Prof. Yiin-Kuen Fuh, Ph.D., P.E and Prof. Ir. Djarot B. Darmadi, M.T., Ph.D. (2024) Study on the mechanical, thermal, and physical properties of SiC-powderreinforced shell for investment casting process: the influence of powder mesh size and content. Magister thesis, Universitas Brawijaya.
Abstract
Ceramic shell molds in investment casting have played an important role in increasing the strength of the mold and having the desired quality and dimensional accuracy. In this article silicon carbide (SiC) is a material having good strength, hardness, resistance to high temperature, chemical stability and thermal conductivity. The thickness of the shell mold has been investigated geometrically, the surface slurry consists of zircon (ZrSiO4) powder with levasil FO830 binder while the backup slurry uses mullite powder with colloidal silica binder and then silica carbide (SiC) material is added as a slurry mixture in making the shell mold. This research investigates the effect of the ratio of silica carbide (SiC) powder 4,000 mesh to silica carbide (SiC) 10,000 mesh with a composition of 5 to 25 wt% on a microscopic scale into the investment casting backup slurry on the mechanical, thermal, and physical properties of the molded shell which will be compared with the original formulation. The main innovation and finding of this research is that the shell mold with the original formulation with various mold thickness variations from 4.5 to 8.5 layers can be replaced with shell molds adding silica carbide (SiC) content of 4.5 layer thickness with contents variations ranging from 5 to 25 wt%. This indicates that shell molds with the addition of silica carbide (SiC) contents can reduce the thickness of layers in the mold by also looking at the strength of the mold, the flow of escaping gas and defects that occur in the shell mold and casting. Figure of merit (FOM) for the shell mold was proposed using the MOR vs. permeability vs. HTC to see how effective the SiC content shell mold can replace the original formulation shell mold. These results provide an important reference for the investment casting industry that requires effectiveness in casting objects that have very strict accuracy and dimensions and also to minimize production costs and time.
English Abstract
Ceramic shell molds in investment casting have played an important role in increasing the strength of the mold and having the desired quality and dimensional accuracy. In this article silicon carbide (SiC) is a material having good strength, hardness, resistance to high temperature, chemical stability and thermal conductivity. The thickness of the shell mold has been investigated geometrically, the surface slurry consists of zircon (ZrSiO4) powder with levasil FO830 binder while the backup slurry uses mullite powder with colloidal silica binder and then silica carbide (SiC) material is added as a slurry mixture in making the shell mold. This research investigates the effect of the ratio of silica carbide (SiC) powder 4,000 mesh to silica carbide (SiC) 10,000 mesh with a composition of 5 to 25 wt% on a microscopic scale into the investment casting backup slurry on the mechanical, thermal, and physical properties of the molded shell which will be compared with the original formulation. The main innovation and finding of this research is that the shell mold with the original formulation with various mold thickness variations from 4.5 to 8.5 layers can be replaced with shell molds adding silica carbide (SiC) content of 4.5 layer thickness with contents variations ranging from 5 to 25 wt%. This indicates that shell molds with the addition of silica carbide (SiC) contents can reduce the thickness of layers in the mold by also looking at the strength of the mold, the flow of escaping gas and defects that occur in the shell mold and casting. Figure of merit (FOM) for the shell mold was proposed using the MOR vs. permeability vs. HTC to see how effective the SiC content shell mold can replace the original formulation shell mold. These results provide an important reference for the investment casting industry that requires effectiveness in casting objects that have very strict accuracy and dimensions and also to minimize production costs and time.
| Item Type: | Thesis (Magister) |
|---|---|
| Identification Number: | 0424070016 |
| Uncontrolled Keywords: | Investment Casting, Silica Carbide, Modulus of Rupture (MOR), Permeability, Heat Transfer Coefficient (HTC) |
| Divisions: | S2/S3 > Magister Teknik Mesin, Fakultas Teknik |
| Depositing User: | Sugeng Moelyono |
| Date Deposited: | 18 Feb 2025 06:58 |
| Last Modified: | 18 Feb 2025 06:58 |
| URI: | http://repository.ub.ac.id/id/eprint/237019 |
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