scholarly journals PHASE ANALYSIS AND PHYSICAL PROPERTIES OF B2O3-ADDED ZIRCON CERAMICS SINTERED AT 1300 °C

2021 ◽  
Vol 14 (1) ◽  
pp. 1-5
Author(s):  
Fikriyatul Azizah Su'ud ◽  
Suminar Pratapa ◽  
Musyarofah Musyarofah
Keyword(s):  
Phase Composition ◽  
Physical Properties ◽  
Vickers Hardness ◽  
Hardness Measurement ◽  
Solid State Reaction Method ◽  
Polished Surface ◽  
Sem Image ◽  
B2o3 Addition ◽  
Average Grain Size ◽  
Significant Difference

This study was aimed to know the effect of B2O3(boria) addition on the phase composition and physical properties of zircon ceramics.The raw zircon powder used in the study was a purified natural zircon sand from Kereng Pangi, Central Kalimantan, Indonesia. The zircon ceramics were prepared by a solid state reaction method with variation of B2O3 addition of 3 wt%, 6 wt% and 9 wt% and sintered at 1300 °C for 5h. The phase composition, density and microstructure were characterized using X-ray diffraction (XRD), densimeter and Scanning Electron Microscope (SEM), respectively. Vickers Hardness measurement was perfomed at the polished surface of the ceramics. Results showed that all samples contained pure zircon phase, i.e. there was no effect of B2O3 addition on the phase composition. In general, the density and hardness increased with increasing B2O3 addition, but addition up to 9 wt% is not optimum to achieve ultra-dense zircon ceramics. Furthermore, the SEM image also showed no significant difference in average grain size. The crystallite size has grown nearly eight times (325 nm) of its original powder. The Vickers hardness of the ceramics is not significantly influenced by the addition of boria. It appears that the boria failure to increase densification also results in the extent of contact between grains which then produces relatively large zircon grains.

The Physical Properties of PMMA Denture base Resin Incorporated with Vanillin

2018 ◽  
Vol 773 ◽  
pp. 338-343 ◽  
Author(s):  
Kittituch Vongvachvasin ◽  
Sroisiri Thaweboon ◽  
Pornkiat Churnjitapirom ◽  
Saowaros Kaophun ◽  
Natdhanai Chotprasert
Keyword(s):  
Flexural Strength ◽  
Physical Properties ◽  
Vickers Hardness ◽  
Flexural Modulus ◽  
Surface Hardness ◽  
Hardness Test ◽  
Antimicrobial Effect ◽  
Denture Base ◽  
Significance Level ◽  
Significant Difference

Long-term use of a denture base can be a reservoir of microbes due to porosities and mechanical wear of denture surfaces. Vanillin has an antimicrobial effect. However, its influence on physical properties after incorporated in PMMA has not yet been evaluated. The purpose of this study was to investigate physical properties of PMMA by incorporating vanillin in different concentrations. Material and method. There were three groups of PMMA with ten specimens per group. Flexural strength and flexural modulus were tested by using a 3-point bending machine, and surface hardness was determined by Vickers hardness test. One-way ANOVA and Kruskal Wallis tests were used to analyze all data at 0.05 significance level. Result. The 0.1% vanillin group yielded a significant difference in Vickers hardness number (17.15 HV) as compared to 0.5% vanillin group (16.30 HV) and without vanillin (15.30 HV). In contrast, the flexural strength and modulus showed no significant difference among test groups upon incorporation of vanillin. Conclusion. The vanillin incorporated PMMA group demonstrated higher surface hardness, compared to the group without vanillin. In addition, there were no significant differences in flexural strength and flexural modulus among the three groups. This study also found no adverse effect in physical properties of the vanillin incorporated PMMA.

STUDY ON PHYSICAL AND SENSORICAL CHARACTERISTICS OF FLESH RESTRUCTURED WITH SAGO CATFISH JERKY

2014 ◽  
Vol 4 (2) ◽  
pp. 55-64
Author(s):  
Amir Jayani ◽  
Zulman Efendi ◽  
Devi Silsia
Keyword(s):  
Physical Properties ◽  
Water Content ◽  
Analysis Of Variance ◽  
Test Data ◽  
Organoleptic Test ◽  
Significant Difference

This study aims to gain influence the thickness and concentration variations affect the characteristics of sago binder physical properties of catfish jerky. As well as getting influence the thickness and concentration variations affect the level of binder sago joy panelists in terms of organoleptic test. Data were analyzed by analysis of variance using the Analysis Of Variance (ANOVA). If there is a significant difference followed by a further test of DMRT 5% level (physical properties). While the hedonic test performed using Kruskal Wallis analysis. Results uniformity analysis (ANOVA) showed catfish fillet thickness and concentration of sago affect the physical properties of the water content and the level of violence. Where catfish jerky using sago binder 5% and 10% significantly different. The use of sago binder 5% and 10% led to an increase in water content. Besides the addition of the binder resulted in increasing levels of violence catfish jerky. Based on the statistics found that the influence of the thickness and concentration of the binder sago aroma, flavor and color of the sixth jerky catfish were not significantly different. But the texture was significantly different.

scholarly journals Anti-Microbial and Remineralizing Properties of Self-Adhesive Orthodontic Resin Containing Mesoporous Bioactive Glass

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3550
Author(s):  
Aerin Choi ◽  
Kyung-Hyeon Yoo ◽  
Seog-Young Yoon ◽  
Bong-Soo Park ◽  
In-Ryoung Kim ◽  
...  
Keyword(s):  
Bond Strength ◽  
Physical Properties ◽  
Bioactive Glass ◽  
Shear Bond Strength ◽  
Antibacterial Effect ◽  
Gram Positive ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
Significant Difference ◽  
Mesoporous Bioactive Glass

Self-adhesive resins (SARs) contain adhesives, which simplify the procedures of resin application, and primers, which provide sufficient bonding ability. In this study, mesoporous bioactive glass nanoparticles (MBN) were added to a SAR to easily improve the physical properties and remineralization ability. The experimental resins comprised 1%, 3%, and 5% MBN mixed in Ortho Connect Flow (GC Corp, Tokyo, Japan). As the MBN content in the SAR increased, the microhardness increased, and a statistically significant difference was observed between the cases of 1% and 5% MBN addition. Shear bond strength increased for 1% and 3% MBN samples and decreased for 5% MBN. The addition of MBN indicated a statistically significant antibacterial effect on both gram-negative and gram-positive bacteria. The anti-demineralization experiment showed that the remineralization length increased with the MBN content of the sample. Through the above results, we found that SAR containing MBN has antibacterial and remineralization effects. Thus, by adding MBN to the SAR, we investigated the possibility of orthodontic resin development, wherein the strength is enhanced and the drawbacks of the conventional SAR addressed.

scholarly journals Effect of Mosses on physical and chemical properties of soil in temperate forests of Garhwal Himalayas

2021 ◽  
pp. 1-10
Author(s):  
Anshu Siwach ◽  
Siddhartha Kaushal ◽  
Ratul Baishya
Keyword(s):  
Physical Properties ◽  
Chemical Properties ◽  
Nutrient Status ◽  
High Rate ◽  
Physical And Chemical Properties ◽  
Garhwal Himalayas ◽  
Forest Sites ◽  
Significant Difference ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract Mosses are one of the most important and dominant plant communities, especially in the temperate biome, and play a significant role in ecosystem function and dynamics. They influence the water, energy and element cycle due to their unique ecology and physiology. The present study was undertaken in three different temperate forest sites in the Garhwal Himalayas, viz., Triyuginarayan (Kedarnath Wildlife Sanctuary (KWLS)), Chakrata, and Kanasar forest range. The study was focused on understanding the influence of mosses on soil physical properties and nutrient availability. Different physico-chemical properties were analysed under two different substrata, that is, with and without moss cover in two different seasons, viz., monsoon and winter. We observed mosses to influence and alter the physical properties and nutrient status of soil in both seasons. All soil physical and chemical properties, except magnesium, showed significant difference within the substrates, among all the sites and across the two seasons. Besides the soil characteristics underneath the moss vegetation, the study also highlights the diversity of mosses found in the area. Mosses appear to create high nutrient microsites via a high rate of organic matter accumulation and retain nutrients for longer periods thus, maintaining ecosystem stability.

Effect of Solution Treatment on Microstructures and Hardness of Mg-Gd-Y-Zr Alloy

2014 ◽  
Vol 937 ◽  
pp. 182-186
Author(s):  
Quan An Li ◽  
Lei Lei Chen ◽  
Wen Chuang Liu ◽  
Xing Yuan Zhang ◽  
Hui Zhen Jiang
Keyword(s):  
Vickers Hardness ◽  
Cast Alloy ◽  
Solution Treatment ◽  
Hardness Measurement ◽  
Solution Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solution Treated ◽  
Primary Particles ◽  
Zr Alloy

The influence of the solution treatment (at the temperature of 500-520°C for 4-12 h) on microstructures and mechanical properties of Mg-Gd-Y-Zr alloy was investigated by means of optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and Vickers hardness measurement. The as-cast alloy contains a microstructure consisting of α-Mg matrix, Mg5Gd phase and Mg24Y5phase. With increasing solution temperature and time, the quantity of the primary particles (Mg5Gd and Mg24Y5) in the alloy continually decreased, and the degree of recrystallization gradually increased, which result in the gradual decrease of the Vickers hardness of the solution-treated alloys.

Evaluation of Mechanical Properties of Dental Feldsphatic Porcelains for Metal and Zirconia Core

2012 ◽  
Vol 727-728 ◽  
pp. 1104-1107
Author(s):  
Antonio Alves de Almeida-Junior ◽  
Gelson Luis Adabo ◽  
Beatriz Regalado Galvão ◽  
Diogo Longhini ◽  
Claudinei dos Santos
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
High Hardness ◽  
Hardness Test ◽  
Dental Prostheses ◽  
Significant Incidence ◽  
Significant Difference ◽  
Fixed Dental Prostheses ◽  
Intermediate Value

Studies has been reported a significant incidence of chipping of the feldspathic porcelain veneer in zirconia-based restorations. The purpose of this study was to compare the three-point flexural strength (MPa), Weibull parameters, Vickers hardness (VHN) and Vickers indentation fracture toughness (MPa/mm1/2) in feldspatic porcelains for metal and for zirconia frameworks. Bar specimens were made with the porcelains e.MaxCeram (EM) and VitaVM9 (V9) for zirconia core, and Duceragold (DG) and VitaVMK95 (VK) for metal core (n= 15). Kruskal-Wallis and Dun test were used for statistical analysis. There was no significant difference (p=0.31) among the porcelains in the flexural strength (Median= 73.2; 74.6; 74.5; 74.4). Weibull calculation presented highest reliability for VK (10.8) followed by EM (7.1), V9 (5.7) and DG (5.6). Vickers hardness test showed that EM (536.3), V9 (579.9) and VK (522.1) had no difference and DG (489.6) had the lowest value (p.001). The highest fracture toughness was to VK (1.77), DG (1.58) had an intermediate value while V9 (1.33) and EM (1.18) had the lowest values (p.001). Despite of the suitable flexural strength, reliability and high hardness, the porcelains used to zirconia-based fixed dental prostheses showed lower fracture toughness values.

Influence of Excess Bi2O3 and Na2Co3 on Crystal Structure and Microstructure of Bismuth Sodium Titanate Ceramics

2011 ◽  
Vol 474-476 ◽  
pp. 1711-1714 ◽  
Author(s):  
Panadda Sittiketkron ◽  
Arrak Klinbumrung ◽  
Theerachai Bongkarn
Keyword(s):  
Crystal Structure ◽  
Dielectric Properties ◽  
Perovskite Phase ◽  
Average Particle Size ◽  
Sodium Titanate ◽  
Solid State Reaction Method ◽  
Lattice Parameter ◽  
Rhombohedral Structure ◽  
Average Particle ◽  
Average Grain Size

This study investigated the influence of excess Bi2O3 and Na2CO3 on the crystal structure, microstructure and dielectric properties of (Bi0.5Na0.5)TiO3 (BNT) ceramics. The BNT ceramics were synthesized using the solid-state reaction method with various excess Bi2O3 and Na2CO3 levels (0, 1, 2, 3 and 4 mol%). The X-ray characterization revealed that all samples had a rhombohedral structure. A pure perovskite phase was obtained in all samples. The lattice parameter a tended to increase with increased excess Bi2O3 and Na2CO3 content in the calcined powders and sintered ceramics. The average particle size increased while, the average grain size tended to decreased with increased of excess Bi2O3 and Na2CO3 content. The depolarization temperature (Td) and the Curie temperature (Tc) were slightly decreased with the increase of excess Bi2O3 and Na2CO3 content. The dielectric properties were related to the density.

scholarly journals Pengaruh Gambut Terbakar Terhadap Beberapa Sifat Fisika Gambut di Kecamatan Tripa Makmur

2020 ◽  
Vol 4 (2) ◽  
pp. 416-425
Author(s):  
Teuku Muhammad Afrizal ◽  
Hairul Basri ◽  
Muhammad Rusli Alibasyah
Keyword(s):  
Organic Matter ◽  
Physical Properties ◽  
Water Content ◽  
Statistical Tests ◽  
Peat Soil ◽  
Rate Of Change ◽  
The Other ◽  
Volume Weight ◽  
Top Soil ◽  
Significant Difference

Abstrak. Gambut mengandung bahan organik yang tinggi. Gambut yang didrainase rentan terhadap kebakaran. Pemanfaatan gambut di Aceh sangat luas. Umumnya, gambut sering dibakar agar dapat dengan cepat dimanfaatkan., khususnya di Kecamatan Tripa Makmur Kabupaten Nagan Raya. Penelitian ini bertujuan untuk melihat seberapa jauh tingkat perubahan sifat fisika gambut terbakar Rawa Tripa Kabupaten Nagan Raya. Hasil penelitian menunjukkan bahwa rata-rata berat volume tertinggi terdapat pada sampel T1 (top soil) yaitu  0,36 g cm-3 dan terendah pada T0 (sub soil) yaitu  0,17 g cm-3. Kadar air tertinggi  terdapat pada sampel T0 (sub soil)  yaitu 234,82% dan terendah pada T1 (top soil) yaitu 81,96%. Porositas tertinggi terdapat pada sampel gambut T0  (sub soil) yaitu 94,93% dan terendah pada T1 (top soil) yaitu 65,28%. Permeabilitas tertinggi terdapat pada T0 (sub soil) yaitu 33,80 cm/jam dan terendah pada T1 (top soil) yaitu 16,10 cm/jam. Hasil uji statistik menunjukkan bahwa ada perbedaan yang signifikan pada parameter berat volume dengan t hitung (3,482) t tabel (1, 943), sedangkan pada parameter lainnya tidak ada perbedaan yang signifikan. Tingkat kematangan gambut di kawasan Tripa Makmur adalah hemik. Kedalaman gambut sebesar 3 meter.  Subsiden tertinggi adalah 100 cm pada gambut terbakar di tahun 2015. Warna  gambut adalah coklat kehitaman. The Effect of Burning Peat on Some of The Physical Porperties of Peat Soil in The Tripa Makmur Sub DistrictAbstract. Peat contains high organic matter. Drained peat is susceptible to fire. The use of peat in Aceh is very broad. Peat is often burned so that it can be quickly utilized especially in Tripa makmur Sub Districk, Nagan Raya Districk. This study aims to see how far the rate of change in the physical properties of peat is burning Rawa Tripa in Nagan Raya District. The results showed that the highest average of volume weight was found in T1(top soil) 0,36 g cm-3 and the lowest in T0(sub soil) 0,17 g cm-3. The highest water content was found inT0(sub soil) 234,82%  and the lowest was on T1(top soil) 81,96%. The highest porosity was found T0(sub soil) 94,93% and the lowest in T1(top soil) 65,28%. The highest permeability is found in T0(sub soil) 33,80 cm/hour and the lowest is on T1(top soil) 16,10 cm/hour. The results of statistical tests show that there is a significant difference in the parameters of volume weight with t count 3,482 t table 1,943, while in the other parameters have no significant differences. The level of maturity in the Tripa Makmur area is hemik. Peat depth of 3 meters. The highest subsidance is 100 cm on burning peat in 2015. The color of this peat is blackish brown. 

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