AbstrakIndonesia dikenal memiliki sumberdaya mineral yang berlimpah dan beberapa diantaranya belum termanfaatkan dengan baik. Batuan beku dari daerah Gayo, yang terletak di Aceh diduga memiliki kandungan felspar yang dapat digunakan sebagai bahan baku pembuatan keramik. Penelitian ini dimaksudkan untuk mengetahui kandungan batuan Gayo dan fisibilitasnya sebagai bahan keramik. Untuk itu telah dilakukan identifikasi kandungan mineral yang ada dalam batuan tersebut dan kemudian dibuat komposisi bahan baku keramik stoneware dengan metode pencampuran triaxial. Perlakuan proses sintering pada suhu yang berbeda (800, 900, 1000, 1100 dan 1250 o C) dilakukan untk mengetahui efek perbedaan suhu sintering terhadap badan keramik. Dari percobaan tersebut, diketahui bahwa batu Gayo mengandung kandungan feldspar sebesar 69 % dengan berat jenis batu Gayo yang diuji adalah 2,6963 + 0,1290 gram/cm 3 . Pada pengujian sampel, diperoleh hasil pada suhu sintering 1250 o C dicapai peresapan air 1,09%, suatu angka yang termasuk dalam daerah peresapan air untuk keramik stoneware menurut ketentuan ISO 10543-3 / ASTM C373 yaitu <3%. Prototipe benda keramik yang dibuat dengan teknik putar menunjukkan kualitas yang baik berdasarkan ketentuan SNI 7275:2008 (tidak retak, bentuk terjaga, badan keramik padat). AbstractIndonesia is known to have abundant mineral resources and some of them have not been properly utilized. Frozen rock from Gayo area, Aceh is suspected to have a feldspar content that can be used as a raw material for the manufacture of ceramics. This study is intended to determine the content of Gayo rocks and their compatibility as ceramic materials. For that purpose, has been identified the existing mineral content in these rocks and then made the composition of stoneware ceramic raw materials with triaxial blend method. Different sintering temperature (800, 900, 1000, 1100 and 1250 o C respectively) has been conducted to known the efffect of sintering temperature on ceramic body. From the experiment, it is known that Gayo stone contains 69%of feldspar with specific gravity is 2.6963 + 0.1290 gram / cm 3 . In the sample test, the results obtained at the sintering temperature of 1250 o C achieved 1.09% water absorption, a number which is included in the water impregnation area for stoneware ceramics according to the provisions of ISO 10543-3 / ASTM C373 ie <3%, .The prototype of ceramic objects made with rotary technique showing good quality according to the provisions of SNI 7275:2008 (not cracked, shape do not change, solid ceramic body). .
Hydroxyapatite (HAp) coating on metallic implant was developed to increase bioactivity of orthopaedic implant. In this work, hydroxyapatite was successfully deposited on commercially pure titanium (CP-Ti) substrate by electrophoretic deposition (EPD). This work aims to determine the effect of dimethylformamide (DMF) as dispersant for EPD suspension followed by heat treatment, on the surface morphology of the HAp coating. HAp powder was suspended in an ethanol-DMF solution with the amount of DMF designed at 0, 5, 10, and 15% per 100 mL suspension. EPD was then performed successfully on all samples. After EPD, the specimens were sintered at 800 °C for 120 minutes in argon atmosphere. Surface morphology, composition, and phase of HAp coating before and after sintering were characterized by Scanning Electron Microscope, Fourier Transform Infrared Spectrometer, and X-ray Diffractometer. X-ray and IR spectra confirmed that sintering had a little effect on the chemical structure and the phase of the deposited HAp. The morphology of the surface is denser across all samples and shows distinguishable features as the amount of DMF in the system was increased. The 15% DMF sample exhibits the mostly grooved surface after sintering. Further analysis showed that sintering reduced the EPD-related shrinkage on the surface and enhanced the size of the pores. Microstructural indication referring to previous research suggested that this type of microscopic surface is very sought after in promoting a good biological interaction between the implant and the host. Further testing must be done to confirm the effect of DMF-modified structure in living tissue.
CaP granules as bone graft are used for open defect of bone, where is not necessary mechanical stability they are proposed for no-load bearing applications. The important feature in the physical structure of a synthetic ceramic bone graft is its porosity, pore size, the volume of porosity and interconnections between the pores are three crucial parameters. The pore structure is of great importance for osteoconduction. The level of porosity, pore size distribution and degree of pore interconnectivity significantly influence the extent of bone ingrowth. According to that, this study investigated the effect of sintering holding time on properties of droplet synthetic ha-alginate using dripping technique sintered at 1000 0C with sintering holding time at 1: 2 :3 hours respectively. XRD was used to investigate of phases of the sintered droplet. Scanning Electron Microscope (SEM) was used to investigate the microstructure of beads. In this work, we can conclude that the holding time increased, the crystallinity increased but on the other hand, pore size, porosity, and surface roughness decreased. For all investigated samples. The surface roughness of A102 (0.2 – 2, μm) which is sintered at 1000 0C 2 hours holding time has a better value offered better cell colonialization and has no significant value of porosity (50%) and crystallinity (86.63%) than those of A103 which need more energy for sintering as a consequence.
Penambahan bahan semen tulang kedalam rongga tulang dapat menjadi salah satu alternatif untuk mencegah kerusakan tulang akibat osteoporosis. Kelemahan utama dari bahan implant ortopedik berbasis hydroksiapatit sinter adalah bahan dalam bentuk solid dimana dalam aplikasi pembedahan, sulit untuk mengisi rongga tulang dengan ukuran tertentu. Alternatif yang nyaman untuk bahan pengisi tulang suspensi adalah dengan menggunakan bahan Injectable bone substitute. Dalam studi ini dipelajari komposisi material Injectable Bone substitute dengan matrik berupa polimer CMC-gelatin dan HA/TCP sebagai filler. Dilakukan variasi rasio Hidroksiapatit (HA) / tri-calcium phosphate (TCP) (70:30; 50:50; 40:60)  untuk  mempelajari pengaruhnya terhadap sifat-sifat fisik dan mekanik campuran. Hasil uji FTIR menunjukkan gugus fungsi fosfat (PO43-) gugus fungsi karboksil dan gugus fungsi NH2 yang merujuk kepada bahan penyusunnya. Peningkatan porositas karena perubahan morfologi dikonfirmasi oleh gambar mikroskop polaritas. Hasil uji tekan menunjukkan berkurangnya  nilai kuat tekan dengan bertambahnya konsentrasi TCP dalam campuran. Semua kelompok uji menunjukkan kemiripan struktural dengan tulang cancellous dalam sifat porositas dan kekuatan mekanik.
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