Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Teknologi Indonesia
Muljadi, -
LIPI Press
Computer Science & IT

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
99 PEMBUATAN BAHAN FILTER KERAMIK BERPORI BERBASIS ZEOLIT ALAM DAN ARANG SEKAM PADI Sebayang, P.; Muljadi, -; Tetuko, Anggito P.
Teknologi Indonesia Vol 32, No 2 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i2.9

Abstract

The porous ceramics filter material have been made from natural zeolit and rice husk charcoal with composition variation (in % of mass). The preparation of zeolit was done using ball mill for 24 hours and rice husk charcoal was prepared using vibrating mill for 1 hour until it can be through out in 100 mesh shieve. The two raw materials about 2 grams were mixed with addition 50 ml of Polivinylalcohol (PVA), then it was mixed again until homogeny. The sample was dried pressed with pressure of 25 kgf/cm and dried in a drying oven at 60 C for 24 hours. The sintering process was done using electrical furnace with heating rate of 10C/minute until it reached temperature of 900 and 1000 C, and holded for 2 hours. From the result of porouc ceramics filter material, the optimum composition is 40% rice husk coke + 60% Zeolit with sintering temperature = 1000 C. At this condition, the properties are density = 2,16 g/cm, shrinkage = 35,94%, porosity = 66,05%, water absorption = 31,10%, modulus of rupture = 7,47 MPa, compressive strength = 4,38 MPa, and coefficient of thermal expansion = 5 x 10 -6 C-1. The result of XRD shows that zeolit has major phase of mordenite (Na8[Al8Si40O96].24H2O) and minor phase of clinoptilolite (Na6[Al6Si36O72].24H2O). The result of XRD on 40% rice husk coke + 60% Zeolit and sintering temperature = 1000 C shows that the major phase is mullite (3Al2O3SiO2) and the minor phase is tridimite (SiO2). Meanwhile, the picture of SEM shows that porous ceramics have irregular particle with size between 110 ?m and its pore size can reaches 20 ?m.
MECHANICAL AND MAGNETIC PROPERTIES OF BONDED MAGNET Nd2Fe14B PRODUCED USING BINDER BAKELITE Muljadi, -; Sardjono, Priyo; Sebayang, Perdamean
Teknologi Indonesia Vol 37, No 3 (2014)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v37i3.231

Abstract

Bonded magnet Nd2Fe14B was made with mixing Nd2Fe14B powder and polymer bakelite using compressing method. The bakelite concentration was varied of 5 wt%, 10 wt%, 15 wt%, and 20 wt%. Both Nd2Fe14B and bakelite powders were mixed and milled for 24 hours using a ball mill. The powder was formed by dry pressing and subsequently dried in a drying cabinet at a temperature of 180oC for 4 hours. Then, magnetization process was done using impulse magnetizer, and performed measurements of the magnetic properties such as flux density, remanenceBr, coercivity Hic and energy density (BH)max using Gaussmeter and hysteresis permeagraph. Characterization of mechanical properties such as bending strength (BS) and vickers hardness (Hv) was determined before magnetization. Bakelite concentration had a significant influence on both magnetic and mechanical properties. From the characterization results, the optimum concentration of bakelite was 10% and 15% wt. Bonded Nd2Fe14B magnet obtained had the following properties: BS value of 27.7433.42 MPa, Hv value of 292.65314.33 MPa, the value of the magnetic flux density from 1360 to 1400 Gauss, remanence Br = 4.995:02 kG, coercivity Hic = 7.8 kOe, and energy density (BH)max about 5.13 to 5.24 MGOe at the optimum concentration.
Co-Authors Anggito P. Tetuko, Anggito P. Perdamean Sebayang Priyo Sardjono Sebayang, P.