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All Journal Makara Journal of Technology
Keba Moto, Keba
Departemen Fisika, Fakultas MIPA, Universitas Indonesia, 16424, Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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 1 
Making Alloys (TI1 - xAlx) N using plasma CVD technique from AlCl3 Powder, H2 and N2 Gas ,with solvent TiCl4 Moto, Keba
Makara Journal of Technology Vol. 6, No. 1
Publisher : UI Scholars Hub

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The substitution of Ti atoms by Al atoms in TiN lattice sites to form (Ti1-xAlx)N is clearly demonstrated by the coatings which were deposited on steel substrate and using plasma CVD technique. The presence of Al atoms in TiN lattice site is shown by means of XRD and EDX techniques: lattice parameters decreasing of TiN as the fraction of Al increases (XRD) and precipitation of hexagonal AlN phase (XRD) as the fraction of Al exceeding 0.8 (EDX). The hardness of these coating are just around 30 GPa, which is beyond the values reported in literatures.
The Role of Si3N4 Amorphous Phase in nc-TiN/a-Si3N4 Nanocomposites in Increases the hardness and Thermal Stability Moto, Keba
Makara Journal of Technology Vol. 6, No. 2
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The role of Si3N4 amorphous phase in nc-TiN/a-Si3N4 nanocomposites will be shown and compared with polycrystalline ZrN/Ni which has no such amorphous phase (non-composites). The presence of amorphous phase Si3N4 increases the hardness of film as well as the toughness of the bulk nanocomposites under indentation load. It has been observed that nc-TiN/a-Si3N4 nanocomposites films has higher thermal stability than ZrN/Ni polycrystalline films.
Development of Hardness Measurement Procedure for Nanocomposite nc-TiN/a-Si3N4 Moto, Keba
Makara Journal of Technology Vol. 6, No. 2
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Hardness of nc-TiN/a-Si3N4 nanocomposites which was determined by using two methods of measurements i. e. depth sensing method and remaining plastic indentation area that were magnified by using SEM (Scanning Electron Microscope) lie in the good agreement. The hardness value is not influenced by the biaxial and residual compressive stress. The measurement of the biaxial stress on the substrate shows a very small value of biaxial stress as well as the constant hardness and crystallite size against annealing temperature. Therefore, the reported hardness value here is the intrinsic value that depend on its microstructure properties.
Phase Composition Analysis Using Rietveld Methode and It's Influence To The Hardness Of Ti-Si-N Nanocomposites Moto, Keba; Setiarini, Lia; Abubakar, Zufar
Makara Journal of Technology Vol. 7, No. 1
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Phase composition analysis using rietveld methode and it’s influence to the hardness of Ti-Si-N nanocomposites. XRD data of nanocomposites Ti-Si-N have been analysed using GSAS based on Rietveld Method in order to identify phases and their composition as well as its influence on the hardness of these nanocomposites. Several new phases have been found in the sample beside the nc-TiN/a-Si3N4& a-/nc-TiSi2 that have been known widely. From the obtained crystalline phase, after the calculation of amorf Si3N4 and TiSi2 phase fraction, it is found that the optimum hardness can be reached when the fraction of a-Si3N4 phase around 8 wt.%
Synthesize of Emulsion Polymer Latex for Sub-Grade CBR Improvement in The Road Construction Moto, Keba; Julian, V.; Syamsudin, Syamsudin; Wiradi, T. A.; Wijaya, S. R.
Makara Journal of Technology Vol. 8, No. 2
Publisher : UI Scholars Hub

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Synthesize of emulsion polymer latex for sub-grade CBR improvement in the road construction. Latex polymer for California Bearing Ratio (CBR) enhancement in sub-grade soil of road building has been prepared by emulsion polymerizations technique. The prepared polymer then characterize by Fourier Transform Infrared (FTIR). For application purpose, CBR test was done to the compacted polymer added-soil. The CBR test is done also for both soaked and unsoaked samples. It is found that our latex polymer is better then other imported latex polymer. For the latex polymer, which is design to have Temperatur glass (Tg) around 9.8-19.6o, indicating the formation of C=O and – C-O-C- bonds at 1732-1736 cm-1 energy absorption as binder groups. CBR test results show that our latex polymer has CBR value around 15-18 % compare to the soil without polymer binder.
Co-Authors Julian, V. Lia Setiarini, Lia Sastra K Wijaya, Sastra K Syamsudin Syamsudin T Wiradi, T V Julian, V Wijaya, S. R. Wiradi, T. A. Zufar Abubakar, Zufar