Ruben Menchavez

Ruben Menchavez
Mindanao State University - Iligan Institute of Technology | MSUIIT · Department of Ceramic, Metallurgical and Mining Engineering

Doctor of Engineering (Materials Science)

About

28
Publications
4,527
Reads
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438
Citations
Citations since 2016
5 Research Items
187 Citations
201620172018201920202021202205101520253035
201620172018201920202021202205101520253035
201620172018201920202021202205101520253035
201620172018201920202021202205101520253035
Introduction
Ruben Menchavez currently works at the Department of Materials and Resources Engineering & Technology, MSU - Iligan Institute of Technology. Ruben does research in Ceramic Engineering. His most recent publication is 'Synthesis of Clay-Based Ceramic/Carbon Composite by Starch Consolidation Casting and Reductive Sintering.'
Additional affiliations
October 2012 - April 2013
Nagoya Institute of Technology
Position
  • Researcher
June 1997 - September 2016
Mindanao State University - Iligan Institute of Technology
Position
  • Professor
June 1997 - September 2016
Mindanao State University - Iligan Institute of Technology
Position
  • Professor (Full)

Publications

Publications (28)
Preprint
Full-text available
This study fabricated a wall-panel board made of rice husk and red clay-based geopolymer. The geopolymer paste was studied at varying molarities of alkali-activator solution with a fixed ratio of Na2SiO3/NaOH at 2.5. A calcined red clay was used as the aluminosilicate precursor at a mass ratio of 1:1 to the activator solution. The geopolymer paste...
Article
This study reports the use of glass cullet in a talc-based ceramic batch formed by starch consolidation technique. Three talc-based ceramic slurries consisted of red clay, glass cullet, and talc were formulated and dispersed at 70 wt% ceramic solid mixed with 16 wt% cassava starch. Ceramic disks, test bars, and tiles were successfully consolidated...
Article
Full-text available
This study successfully employed a pore self-forming technique to fabricate red clay-based porous ceramics using binary mixtures of indigenous materials. Using a Least Square Method for Matrices, a binary proportion of the ceramic mixture based on a gehlenite phase (2CaO.Al2O3.SiO2) was calculated to consist of 48.15% Kauswagan clay and 51.85% lime...
Article
We have observed a progression of the shape and velocity of a bubble rising in aqueous gelatin solution under gelation process. Two experimental systems were designed to produce two different bubble sizes that were allowed to rise in test sections filled with aqueous gelatin solution. The physical gelling was allowed to proceed slowly in a temperat...
Conference Paper
This study explores a method of synthesizing a clay-based ceramic/carbon composite by starch consolidation casting followed by low-temperature reductive sintering. The ceramic slurry was prepared from a ternary powder mixture of 46.7 wt% Lama-lama clay, 18.00 wt% quartz and 35.30 wt% feldspar. The slurry was consolidated with 16.0 wt% potato starch...
Article
This study presents a simultaneous application of pressure cooking and microwave irradiation to consolidate ceramic slurry as a rapid shaping technique. The ceramic slurry, composed of red clay, feldspar, quartz and water, was solidified with the gelatinization of starch under varying heating conditions inside a domestic microwave pressure cooker....
Article
Full-text available
The consolidation of red clay-based slurry by gelatinization of starch in a domestic pressure cooker was presented. Aqueous ceramic slurries were prepared consisting of a ternary powder mixture of red clay, quartz, feldspar, and different starch types. The starch slurries with and without the presence of ceramic particles demonstrated the same gell...
Article
This paper reports a facile and environment-friendly process to synthesize electrically conductive porous alumina/graphite composites by starch consolidation technique followed by reductive sintering. Green ceramic composites were consolidated with different starches and sintered at different temperatures in an argon atmosphere. Electrical measurem...
Article
This paper reports the use of a micro X-ray CT scan system to measure the viscosity increase during in-situ gelation of a gelcasting slurry. Three small steel balls were dropped in the slurry at a desired time interval after the addition of the gelling agent, while being monitored by the CT scan system. It was determined that the plot of the logari...
Article
Full-text available
The optimum dispersion and rheological properties of red clay-based ceramic suspension loaded with unary and binary starch were investigated in aqueous medium. The aqueous ceramic suspension was prepared consisting of red clay, quartz, feldspar, and distilled water. Using a polyelectrolyte dispersant (Darvan 821A), the ternary ceramic powder was in...
Article
Full-text available
The optimum dispersion and rheological properties of red clay-based ceramic suspension loaded with unary and binary starch were investigated in aqueous medium. The aqueous ceramic suspension was prepared consisting of red clay, quartz, feldspar, and distilled water. Using a polyelectrolyte dispersant (Darvan 821A), the ternary ceramic powder was in...
Article
Red clay-based porous ceramic has been fabricated by using a biological foaming technique through reaction of yeast with starch in aqueous ceramic suspension. The starch plays a dual role as a growth substrate for gas bubble generation and a binder for ceramic particles. Starch-loaded ceramic slurries (55 wt% ceramic solid) were prepared, consistin...
Article
Electrically conductive alumina ceramic has been successfully fabricated by sintering of dried gelcast alumina in an inert atmosphere. The process was developed similar to the conventional gelcasting method except for varying the amount of monomer in the premix solution. The sintering treatment was carried out in argon gas from 1100 °C to 1700 °C....
Article
A novel, highly conductive porous alumina/nanocarbon network (alumina/NCN) composites were fabricated. The electrochemical behaviors of the composite materials were studied by electrochemical measurements, X-ray diffraction patterns, scanning electron microscopy observations, and so on. The results showed that the reproducibility and stability of t...
Article
A novel highly conductive alumina/nano-carbon network composites (alumina/NCN composites) was fabricated by gelcasting and reduction-sintering method under argon atmosphere. The electrochemical behaviors of the alumina/NCN composites were studied systematically in some aggressive solutions (HCl, H2SO4, HNO3, NaOH, and KOH), using potentiodynamic po...
Article
Porous ceramics fabricated by gelcasting bring many unique capabilities in mitigating environmental issues, particularly waste recycling and neutralization of hazardous emissions. Potential opportunities for using gelcasting technique in setting mechanically foamed slurry can be described by adaptable designing and modification of the foamed slurry...
Article
A method is presented to synthesize nanoscale carbon networks with electrically conductive dense and porous alumina. The method can be used to transform the gel-binder networks of dense and porous alumina into the carbon networks. The study observed morphologies of pyrolyzed nanoscale carbon networks in sintered dense and porous gel-cast alumina ce...
Article
This study investigates the phase compositions in gelcast dense alumina and porous alumina that were sintered in an inert atmosphere. Both materials were gelcasted using identical slurry composition except for adding surfactant to slurry intended for porous shaping. The resulting gelcasted samples were dried and then sintered in argon gas at 1700°C...
Article
Cordierite ceramic filters have been shown a potential candidate for a high temperature dust collection, owing to its very low thermal expansion coefficient characteristic as an attribute of excellent thermal shock resistance. It is preferable that a design of porous cordierite filter should have low pressure drop with high permeability while keepi...
Article
Electrically conducting porous ceramics have gained a recent surge of interest in the development of high performance radiant heaters for the oxidation of noxious emissions, and others. This paper describes a simple and direct approach for introducing an electrical conductive phase into insulating porous alumina by gelcasting of mechanically foamed...
Article
Gelcasting by use of traditional monomer formulations encounter several limitations, such as inhibition of gelation in the presence of oxygen, cracking during drying and sintering steps, neurotoxicity, and others. Many reports have successfully resolved each individual issue, but none addressed all limitations in single slurry formulation. In this...
Article
This paper presents the comparison of two different techniques, namely, capillary suction time (CST) and flow point measurements for determination of maximum achievable solids loading in slurries. Good agreement was observed between the two techniques for Al2O3 and Y2O3. The shift in isoelectric points (iep) of the powders in presence of a dispersa...
Article
The dispersion behavior of a concentrated ceramic suspension (Al(2)O(3)) has been investigated in terms of capillary suction time (CST) with varying solids concentration both in the absence as well as in the presence of dispersant (APC). The CST value is found to be the lowest at the pH(iep) whereas it increases as the pH is changed either to the a...
Article
In this study, we propose a new process to fabricate electrically conductive alumina by gelcasting and reduction sintering. The process used the conventional gelcasting method except for varying amounts of monomer at 2.8, 5.5, and 8.0 wt.% relative to the weight of the slurry. In the plastic mould, the slurry was under in situ solidification for 3...
Article
In this study, we propose a new process to fabricate electrically semi-conductive alumina by the combination of gelcasting and reduction sintering. The process is similar to the conventional gelcasting method except for varying amounts of methacrylamide monomer dosages at 2.83, 5.50, and 8.04 wt% relative to the mass of the slurry. Correspondingly,...
Article
This work demonstrated an in-situ pyrolysis of gelcast alumina under reduction sintering to make alumina and carbon composite in providing semi-electrical conductivity. To increase the carbon content, the monomer was varied in the premix solution with reduction sintering in nitrogen gas. Two-probe method was used to measure electrical resistance of...
Article
The colloidal stability of suspensions of alumina particles has been investigated by measuring particle size distribution, sedimentation, viscosity, and zeta potential. Alumina particles were found to be optimally dispersed at pH around 3 to 7.8 without dispersant and at pH 8.5 and beyond with dispersant. The above results corroborate zeta potentia...

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