Sintering of Partially Stabilized Zirconia by Microwave Heating Using ZnO-MnO2-Al2O3 Plates in a Domestic Microwave Oven

2004 ◽  
Vol 83 (8) ◽  
pp. 2085-2087 ◽  
Author(s):  
Satoru Fujitsu ◽  
Makoto Ikegami ◽  
Takashi Hayashi
Keyword(s):  
Microwave Heating ◽  
Microwave Oven ◽  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia ◽  
Domestic Microwave Oven

Research on Predicting the Stability of Partially Stabilized Zirconia Prepared by Microwave Heating Using SVM

2010 ◽  
Vol 146-147 ◽  
pp. 510-516
Author(s):  
Sheng Hui Guo ◽  
Li Jun Liu ◽  
Dong Bo Li ◽  
Jin Hui Peng ◽  
Li Bo Zhang ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Influence Factors ◽  
Theory And Practice ◽  
Future Application ◽  
Support Vector ◽  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia ◽  
Typical Data ◽  
Svm Model ◽  
The Stability

The stability is a key product performance index, which can directly determine the quality of the partially stabilized zirconia (PSZ), so how to predict the stability of PSZ accurately, quickly and easily in the preparation process is very important. In this paper, a new mathematical model to predict the stability of PSZ prepared by microwave heating was proposed, based on statistical theory (SLT) and support vector machine (SVM) theory, which relates the stability of PSZ and the influence factors, such as the holding temperature, rising rate of temperature, holding time, decreasing rate of temperature and hardening temperature. Typical data collected from 58 experiments were used for the training samples and test samples. Then testing and analyzing was done. The results showed that the SVM model is reasonable and it is accurate and reliable to predict the stability of the partially stabilized zirconia prepared by microwave heating by SVM model. Besides, multiple influence factors can be comprehensively considered in the SVM model, thus a new highly effective method for predicting the stability of PSZ prepared by microwave heating is provided for future application, which is of great significance to theory and practice.

scholarly journals Otimização da produção de biodiesel a partir de óleo de coco babaçu com aquecimento por microondas

2018 ◽  
Vol 39 (4) ◽  
pp. 37
Author(s):  
Ulisses Magalhães Nascimento ◽  
Antonio Carlos Sales Vasconcelos ◽  
Eduardo Bessa Azevedo ◽  
Fernando Carvalho Silva
Keyword(s):  
Microwave Heating ◽  
Irradiation Time ◽  
Reaction Times ◽  
Coconut Oil ◽  
Microwave Oven ◽  
Raw Material ◽  
Biodiesel Production ◽  
Experimental Conditions ◽  
Domestic Microwave Oven ◽  
Central Composite

Reactions under microwave heating present reduced reaction times and larger yields. Therefore, this work is aimed at adapting a domestic microwave oven and optimizing the transesterification reaction used in biodiesel production with microwave heating, using babaçu coconut oil as raw material. It was used a central composite design for varying irradiation time, KOH concentration, and oil:methanol ratio. Statistical analyses were performed in orderto assess the significance of the model used. The optimized experimental conditions were: oil:methanol ratio, 8.59; KOH concentration, 2.19 %; and irradiation time, 70 seconds, givingan yield of approximately 100% regarding esters formation.

Effect of SiCp Addition on Microstructure and Mechanical Properties of ZTA Ceramics by Microwave Sintering

2018 ◽  
Vol 281 ◽  
pp. 217-223 ◽  
Author(s):  
Yong Qiang Chen ◽  
Sai Li ◽  
Wei Li ◽  
Ting Ting Su ◽  
Bing Bing Fan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microwave Heating ◽  
Bending Strength ◽  
Microwave Sintering ◽  
Precipitation Method ◽  
Stabilized Zirconia ◽  
Oriented Growth ◽  
Directional Growth ◽  
Partially Stabilized Zirconia ◽  
Microstructure And Mechanical Properties

The effects of SiCp addition on the microstructure and mechanical properties of ZTA ceramics was investigated by microwave sintering. Partially stabilized zirconia（3Y-ZrO2）nanopowder containing SiCp was prepared by microwave pyrolysing precursor which was was achieved by co-precipitation method. The powders of alumina, yttria partially stabilized zirconia containing SiCp were mixed to prepare ZTA ceramics green body by die pressing and cold isostatic pressing and subsequently sintered at the range of 1350°C-1550°C for 30min by microwave. XRD revealed that 3Y-ZrO2/SiC powder contained more tetragonal phase than 3Y-ZrO2 powder which was also confirmed by SEM and particle size distribution. The phenomenon was because of SiCp forming the microwave heating spot that promoted pyrolysis progress when 3Y-ZrO2/SiC powder was prepared by microwave heating. Microstructure showed that the grain of ZTA ceramics had directional growth by microwave sintering. SiCp firstly absorbed microwave that made more uniform sintering of ZTA ceramics and caused local oriented growth of zirconia and alumina. Thus, the bending strength of ZTA ceramics was higher than ZTA without SiCp. The ladder type heating mode of microwave sintering ZTA ceramics reduced relatively sintering time by 20min due to the addition of SiCp.Introduction

Article

1998 ◽  
Vol 76 (5) ◽  
pp. 525-532 ◽  
Author(s):  
R N Gedye ◽  
J B Wei
Keyword(s):  
Microwave Heating ◽  
Atmospheric Pressure ◽  
Hot Spots ◽  
Rate Increase ◽  
Ethyl Cyanoacetate ◽  
Microwave Oven ◽  
Conventional Heating ◽  
Knoevenagel Reaction ◽  
Variable Frequency ◽  
Domestic Microwave Oven

Several different reactions have been studied to determine whether they occur more rapidly than conventionally heated reactions at atmospheric pressure. Small rate enhancements have been observed for some reactions carried out under microwave reflux in a modified domestic microwave oven. The Knoevenagel reaction of acetophenone with ethyl cyanoacetate was shown to have a rate enhancement of 2.5 times. However this reaction showed no rate increase over conventional heating, at the same temperature, in a variable-frequency microwave oven. It is therefore probable that the small rate enhancements observed in these experiments, using microwave heating, were due to hot spots or superheating of the solvent rather than to nonthermal effects.Key words: microwave, nonthermal effects, superheating, hot spots.

scholarly journals Thermal treatment of superconductor thin film of the BSCCO system using domestic microwave oven

2012 ◽  
Vol 478 ◽  
pp. 56-59 ◽  
Author(s):  
J.B. Silveira ◽  
C.L. Carvalho ◽  
G.B. Torsoni ◽  
H.A. Aquino ◽  
R. Zadorosny
Keyword(s):  
Thin Film ◽  
Thermal Treatment ◽  
Microwave Oven ◽  
Bscco System ◽  
Domestic Microwave Oven

Synthesis of Oximes in the Microwave Oven

1992 ◽  
Vol 57 (11) ◽  
pp. 2407-2412 ◽  
Author(s):  
Monika Puciová ◽  
Štefan Toma
Keyword(s):  
Microwave Heating ◽  
Reaction Rate ◽  
Microwave Oven ◽  
Effect Of Solvents

The synthesis of a broad range of oximes has been studied. It was found that the application of microwave heating enhanced dramatically the reaction rate, and practically quantitative yields of oximes were isolated after less than 1-min heating in the most cases. The effect of solvents on the course of the reaction was also studied.

A mode of deformation in partially stabilized zirconia

1981 ◽  
Vol 16 (5) ◽  
pp. 1428-1431 ◽  
Author(s):  
R. H. J. Hannink ◽  
M. V. Swain
Keyword(s):  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia
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