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Teguh Triyono
Staf Pengajar Jurusan Teknik Mesin Universitas Sebelas Maret

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Karakterisasi biokomposit sheep hydroxyapatite (sha)/shellac/tepung terigu Izmi Mahfudi; Joko Triyono; Teguh Triyono
Mekanika: Majalah Ilmiah Mekanika Vol 17, No 2 (2018): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v17i2.35125

Abstract

The development of science and technology has led to new inovations in the medical field, especially ortopedic. The aim of those inovations is to find the alternatives of good materials that can replace the broken sturcture of bone tissue. One of the innovations conducted is the characterization of sheep hydroxyapatite biocomposite. This study aims to investigate the mechanical properties of the material Sheep Hydroxyapatite (SHA) / shellac / wheat fluor. Sheep bone powder already gained from the crusher process and meshing into size of 100 and are soaked for 24 hours, then mixed with wheat flour with the ratio 30 : 70 %wt, 40 : 60 %wt, 50 : 50 %wt, 60 : 40 %wt, 70 : 30 %wt. The next step is the forming process and calcination at a temperature of 900oC with a increase of 10 °C/min. Results of X-Ray Diffraction (XRD) shows that the diffraction peak of SHA/shellac/wheat flour is the value of 2θ: 32.0747º, 33.1943º, 32.5338º. The lowest hardness number of SHA/shellac/wheat flour is 2.86 VHN and the highest is 14.80 VHN, also the highest strong pressure number is 0.20 MPa. The result of microscophy at observation using SEM shows Thar the SHA/shellac/wheat flour 50:50 % wt sample has more porosity as.
Pengaruh kecepatan gerak torch pemanas pada proses automatic flame hardening terhadap nilai kekerasan dan kekuatan tarik baja karbon medium Andi Purwanto; Teguh Triyono; Sukmaji Indro Cahyono
Mekanika: Majalah Ilmiah Mekanika Vol 17, No 2 (2018): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v17i2.35127

Abstract

Steel material was widely used and obtained in the industry and automotive application. The hardness of the surface area and the ductile of the core were produced by using heat treatment, in this case, automatic flame hardening method was used. The heat treatment process was done in order to increase the surface temperature by using a carburizing flame and then the cooling process by using water cooling medium continously followed. The aim of this research was to identify the effect the heating torch velocity on the surface hardness and the tensile strength of the medium carbon steel using the automatic flame hardening process. Some variations were used in this research were heating torch velocities at 10 mm/min, 20 mm/min, 30 mm/min, and 40 mm/min. The results shows that the heating torch velocity at speed 10 mm/min was the most optimal parameter. The maximum hardness of the surface area is reached 398.9 VHN, while the highest tensile strength was 647.3 MPa and the perlit-ferrit phase was also formed. By these results, the hard properties on the surface area and the ductile properties in the middle area of the specimen could be obtained.
Co-Authors Andi Purwanto Izmi Mahfudi Joko Triyono Sukmaji Indro Cahyono