Influence of Ta2O5 doping on mechanical and biological properties of silicate glass-ceramics

AbstractThe mechanical properties of silicate glass-ceramics were evaluated based on the compressive strength tests. It was found that Ta2O5 addition improved densification, refinement of the microstructure and toughening of the bodies. The maximum compressive strength of the bodies with 1 mol% Ta2O5 was increased 3-fold (245.92 ±0.3 MPa) in comparison to undoped glass-ceramics which was measured to be 89.04 ±0.3 MPa, while for 3 mol% it became 4-fold (387.12 ±0.4 MPa) greater. The addition of Ta2O5 stabilized the system by controlling the biodegradation of the glass-ceramics. It effectively depressed the apatite formation as by addition of 3 mol% Ta2O5 no apatite layer was observed. It may be concluded from this study that mechanical and physical properties can be improved by the addition of Ta2O5, but at a cost of bioactivity. Still the optimized composition having Ta2O5 ⩽ 1 mol% may provide appropriate strength of biomaterials for high load bearing applications.

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Effect of firing temperature on physico-mechanical properties of contemporary clay brick productions in Lalitpur, Nepal

Bangladesh Journal of Scientific and Industrial Research ◽

10.3329/bjsir.v55i1.46731 ◽

2020 ◽

Vol 55 (1) ◽

pp. 43-52 ◽

Cited By ~ 1

Author(s):

NB Bohara ◽

DB Ghale ◽

YP Chapagain ◽

N Duwal ◽

J Bhattarai

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Physical Properties ◽

Bulk Density ◽

Firing Temperature ◽

Apparent Porosity ◽

Clay Brick ◽

Mechanical And Physical Properties ◽

Fired Bricks ◽

Maximum Compressive Strength

Effect of firing temperature on some physico-mechanical properties of ten brick samples, those were composed by feldspars, quartz, alumina-rich spinel, primary mullite and hematite phases, was investigated in accordance with ASTM standards. The brick samples fired between 700° to 1100° C showed 11-23 % water adsorptivity (WA), 19-37 % apparent porosity (AP) and 1.50-1.65 g/cm3 bulk density (BD) indicate good physical properties. The maximum compressive strength (CS) of the fired-bricks at 950° to 1000° C was found to be between 15.6 and 17.1 MPa. At 700°-1000° C firing temperatures, the CS of these bricks is found to be increased exponentially with decreasing of both WA and AP, however it is found to be increased with increasing the BD. Consequently, it can be said that there is good correlation between mechanical and physical properties of the fired-brick samples up to the firing temperature of 1000° C. Bangladesh J. Sci. Ind. Res.55(1), 43-52, 2020

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The Effect of Bioglass Addition on Mechanical and Physical Properties of Photoactive UDMA-TEGDMA Resin Composites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.587.215 ◽

2013 ◽

Vol 587 ◽

pp. 215-221 ◽

Cited By ~ 1

Author(s):

Laura C. Nicolae ◽

Richard M. Shelton ◽

Paul R. Cooper ◽

Richard A. Martin ◽

William M. Palin

Keyword(s):

Mechanical Properties ◽

Flexural Strength ◽

Physical Properties ◽

Silicate Glass ◽

Near Infrared ◽

Resin Composites ◽

Strength Tests ◽

Mechanical And Physical Properties ◽

Size And Morphology ◽

45S5 Bioglass

The effect of Bioglass addition on mechanical and physical properties of photoactive UDMA-TEGDMA resin composites Laura Nicolae, William Palin, Richard Shelton, Paul Cooper Aim: To determine the effect of Bioglass incorporation on the polymerisation rate (Rp), degree of conversion (DC), flexural strength and modulus (FS/FM) of light-curable filled resin composites (FRCs). Methods: Experimental photoactive resins containing various UDMA-TEGDMAratios and filled with non-silanised irregular or spherical 45S5-Bioglass (50μm; 5-40mass%) and/or silanised silicate glass filler particulates (0.7μm; 50-70mass%) weretested. Rp and DC wereanalysed by real-time near-infrared spectroscopy. FS/FM of resins and FRCs were determined using three-point flexural strength tests. Results: Addition of up to 20mass%45S5-Bioglass filler significantly increased DC and FS(p<0.05), although >20mass% had deleterious effects on mechanical properties. The addition of spherical Bioglass particles resulted in an increased DC compared with that of irregular filler morphology although no significant differences mechanical properties were observed (p>0.05). Conclusion: Addition of 45S5-Bioglass with specific filler content, size and morphology resulted in enhanced mechanical and physical properties compared with conventional silicate glass FRCs.

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PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

Jurnal Riset Industri Hasil Hutan ◽

10.24111/jrihh.v4i1.1195 ◽

2012 ◽

Vol 4 (1) ◽

pp. 1

Author(s):

Djoko Purwanto

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Physical Properties ◽

Treatment Process ◽

Acacia Mangium ◽

Physical And Mechanical Properties ◽

Wood Fibers ◽

Test Parameters ◽

Mechanical And Physical Properties ◽

Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

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Assessment of the mechanical properties of glass ionomer cements for orthodontic cementation

Dental Press Journal of Orthodontics ◽

10.1590/s2176-94512012000600027 ◽

2012 ◽

Vol 17 (6) ◽

pp. 154-159 ◽

Cited By ~ 1

Author(s):

Marcel M. Farret ◽

Eduardo Martinelli de Lima ◽

Eduardo Gonçalves Mota ◽

Hugo Mitsuo S. Oshima ◽

Gabriela Maguilnik ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Compressive Strength ◽

Bond Strength ◽

Shear Bond Strength ◽

Glass Ionomer Cements ◽

Glass Ionomer ◽

Resin Modified Glass Ionomer ◽

Strength Tests ◽

Diametral Tensile Strength

OBJECTIVE: To evaluate the mechanical properties of three glass ionomers cements (GICs) used for band cementation in Orthodontics. METHODS: Two conventional glass ionomers (Ketac Cem Easy mix/3M-ESPE and Meron/Voco) and one resin modified glass ionomer (Multi-cure Glass ionomer/3M-Unitek) were selected. For the compressive strength and diametral tensile strength tests, 12 specimens were made of each material. For the microhardness test 15 specimens were made of each material and for the shear bond strength tests 45 bovine permanent incisors were used mounted in a self-cure acrylic resin. Then, band segments with a welded bracket were cemented on the buccal surface of the crowns. For the mechanical tests of compressive and diametral tensile strength and shear bond strength a universal testing machine was used with a crosshead speed of 1,0 mm/min and for the Vickers microhardness analysis tests a Microdurometer was used with 200 g of load during 15 seconds. The results were submitted to statistical analysis through ANOVA complemented by Tukey's test at a significance level of 5%. RESULTS: The results shown that the Multi-Cure Glass Ionomer presented higher diametral tensile strength (p < 0.01) and compressive strength greater than conventional GICs (p = 0.08). Moreover, Ketac Cem showed significant less microhardness (p < 0.01). CONCLUSION: The resin-modified glass ionomer cement showed high mechanical properties, compared to the conventional glass ionomer cements, which had few differences between them.

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Brushite cement containing gelatin: evaluation of mechanical strength and in vitro degradation

Cerâmica ◽

10.1590/0366-69132019653742585 ◽

2019 ◽

Vol 65 (374) ◽

pp. 261-266 ◽

Cited By ~ 1

Author(s):

L. P. Silva ◽

M. D. P. Ribeiro ◽

E. S. Trichês ◽

M. Motisuke

Keyword(s):

Mechanical Properties ◽

Weight Loss ◽

Compressive Strength ◽

Solid Phase ◽

Setting Time ◽

Biological Properties ◽

Solubility In Water ◽

Ringer’S Solution ◽

Weight Loss Data

Abstract Calcium phosphate cements (CPCs) are potential materials for repairing bone defects, mainly due to their excellent biocompatibility and osteoconductivity. Nevertheless, their low mechanical properties limit their usage in clinical applications. The gelatin addition may improve the mechanical and biological properties of CPCs, but their solubility in water may increase the porosity of the cement during degradation. Thus, the aim of this work was to investigate the influence of gelatin on the setting time, compressive strength and degradation rate of a brushite cement. CPCs were prepared with the addition of 0, 5, 10 and 20 wt% of gelatin powder in the solid phase of the cement. The results indicated that the setting time increased with gelatin. Furthermore, cement with 20 wt% of gelatin had an initial compressive strength of 14.1±1.8 MPa while cement without gelatin had 4.5±1.2 MPa. The weight loss, morphology and compressive strength were evaluated after degradation in Ringer’s solution. According to the weight loss data, gelatin was eliminated of samples during degradation. It was concluded that the presence of gelatin improved CPCs mechanical properties; however, as degradation in Ringer’s solution evolved, cement compressive strength decreased due to gelatin dissolution and, consequently, an increase in sample porosity.

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Experimental Strength of Earth-Based Construction Materials in Different Regions of China

Advances in Materials Science and Engineering ◽

10.1155/2019/8130743 ◽

2019 ◽

Vol 2019 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Kun Zhang ◽

Bairu Lu ◽

Yihong Wang ◽

Zhijun Lei ◽

Zhanshen Yang

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Construction Materials ◽

Earth Construction ◽

Strength Tests ◽

The World ◽

Red Earth ◽

Material Load ◽

Earthen Buildings ◽

Selection Of

According to the latest UN statistics, more than 2 billion people in the world still live in various forms of earthen buildings, including some in China. The variety of earth-based constructional materials is significant among different regions, with each region influencing the selection of local earth construction materials. In this study, earth materials from four regions of China were collected and sorted, with 10 samples from each source, and cube compressive strength tests were performed to analyze the composition and mechanical properties of the four materials, including northeast black earth, southeast red earth, northwest loess, and Xinjiang yellow sand earth. The results showed that significant differences existed in the composition of earth-based constructional materials from different regions, which have influence on the materials’ compressive strength. The order from large to small of compressive strengths was loess, black earth, yellow sandy earth, and red earth. Material load-displacement curves were influenced significantly by the plasticity index, but the overall failure processes of the various samples were basically the same.

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Development of Heavyweight Self-Compacting Concrete and Ambient-Cured Heavyweight Geopolymer Concrete Using Magnetite Aggregates

Materials ◽

10.3390/ma12071035 ◽

2019 ◽

Vol 12 (7) ◽

pp. 1035 ◽

Cited By ~ 11

Author(s):

Afsaneh Valizadeh ◽

Farhad Aslani ◽

Zohaib Asif ◽

Matt Roso

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Tensile Tests ◽

Offshore Structures ◽

Experimental Program ◽

Geopolymer Concrete ◽

Self Compacting Concrete ◽

Coarse Aggregates ◽

Maximum Compressive Strength ◽

Heavyweight Concrete

Heavyweight self-compacting concrete (HWSCC) and heavyweight geopolymer concrete (HWGC) are new types of concrete that integrate the advantages of heavyweight concrete (HWC) with self-compacting concrete (SCC) and geopolymer concrete (GC), respectively. The replacement of natural coarse aggregates with magnetite aggregates in control SCC and control GC at volume ratios of 50%, 75%, and 100% was considered in this study to obtain heavyweight concrete classifications, according to British standards, which provide proper protection from sources that emit harmful radiations in medical and nuclear industries and may also be used in many offshore structures. The main aim of this study is to examine the fresh and mechanical properties of both types of mixes. The experimental program investigates the fresh properties of HWSCC and HWGC through the slump flow test. However, J-ring tests were only conducted for HWSCC mixes to ensure the flow requirements in order to achieve self-compacting properties. Moreover, the mechanical properties of both type of mixes were investigated after 7 and 28 days curing at an ambient temperature. The standard 100 × 200 mm cylinders were subjected to compressive and tensile tests. Furthermore, the flexural strength were examined by testing 450 × 100 × 100 mm prisms under four-point loading. The flexural load-displacement relationship for all mixes were also investigated. The results indicated that the maximum compressive strength of 53.54 MPa was achieved by using the control SCC mix after 28 days. However, in HWGC mixes, the maximum compressive strength of 31.31 MPa was achieved by 25% magnetite replacement samples. The overall result shows the strength of HWSCC decreases by increasing magnetite aggregate proportions, while, in HWGC mixes, the compressive strength increased with 50% magnetite replacement followed by a decrease in strength by 75% and 100% magnetite replacements. The maximum densities of 2901 and 2896 kg/m3 were obtained by 100% magnetite replacements in HWSCC and HWGC, respectively.

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EFFECT OF PETROLOGICAL FEATURES ON MECHANICAL PROPERTIES OF ROCK SALT FROM THE LGOM (LEGNICA–GŁOGÓW COPPER DISTRICT)

Biuletyn Państwowego Instytutu Geologicznego ◽

10.5604/01.3001.0009.4572 ◽

2016 ◽

pp. 51-64 ◽

Cited By ~ 1

Author(s):

Katarzyna CYRAN ◽

Tomasz TOBOŁA ◽

Paweł KAMIŃSKI

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Uniaxial Compressive Strength ◽

Rock Salt ◽

Fluid Inclusions ◽

Mechanical Parameters ◽

Research Results ◽

Strength Tests ◽

Crystal Boundaries

The paper presents the attempt to find a correlation between the content of impurities and mechanical parameters of rock salt from the LGOM. Research was carried out in three steps: uniaxial compressive strength tests, determination of the content of insoluble minerals (impurities), and observations under the microscope and Raman microspectroscopy. The research results reveal that the rock salt which is characterized by low content of insoluble minerals (0.13–2.11% wt.) shows no correlation between the mechanical properties and the content of impurities. However, it was found that mechanical properties depend on both the distribution of impurities in halite crystals and the presence of fluid inclusions and hydrocarbons along the crystal boundaries. Moreover, the distribution of anhydrite at the edges of halite crystals may influence an increase of rock salt strength. On the contrary, the presence of fluid inclusions and hydrocarbons along the halite crystal boundaries may reduce the rock salt strength.

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Research about the Effect of Polypropylene Fiber on Mechanical Properties of Curing Sludge

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.250-253.788 ◽

2011 ◽

Vol 250-253 ◽

pp. 788-794

Author(s):

Shu Lin Zhan ◽

Shu Sen Gao ◽

Jun Ying Lai

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Shear Strength ◽

Water Content ◽

Unconfined Compressive Strength ◽

Polypropylene Fiber ◽

Physical And Mechanical Properties ◽

Curing Time ◽

Strength Tests ◽

Different Content

In order to study the influence of modified polypropylene (PP) fiber on the physical and mechanical properties of curing sludge, the same amount of cement and different content of polypropylene fiber were mixed into the sludge. Unconfined compressive strength tests, water content tests and shear strength tests were carried out on different specimens with different curing time. The results show that the sludge curing effect is markedly improved by the addition of the polypropylene fiber. As to the curing sludge with the same curing time, when the content of the polypropylene fiber increases, the unconfined compressive strength and the cohesive strength greatly increase, and the internal frictional angle decreases.

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PENGARUH PENAMBAHAN PELEPAH KELAPA SAWIT SEBAGAI BAHAN CAMPURAN TERHADAP SIFAT MEKANIK KUAT TEKAN DAN POROSITAS BATU BATA

Jurnal Agro Fabrica ◽

10.47199/jaf.v1i2.91 ◽

2019 ◽

Vol 1 (2) ◽

pp. 47-53

Author(s):

Seno Aji ◽

Teguh Satria Mahlindo ◽

Sari Anggraini

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Oil Palm ◽

Block Design ◽

Test Results ◽

Oil Palm Fronds ◽

Randomized Block Design ◽

Strength Tests ◽

Palm Fronds ◽

Palm Frond

This study aimed to determine the effect of oil palm fronds addition as a mixture to the mechanical properties of bricks in terms of porosity testing, and compressive strength, and to determine the proper percentage of oil palm frond additions. This research is a type of experiment with a randomized block design (RBD) arranged non-factorial and the data is processed using the SPSS 20 Tukey test program. This study used a brick-shaped sample with a length of 19 cm, a width of 9.5 cm and a height of 4.5 cm. Variations in the composition of the added oil palm fronds are 0%, 5%, 10%, 15%, and 20%. Parameter mechanical properties of bricks included porosity, and compressive strength tests. The addition of oil palm fronds with a composition percentage of 0% to 10% affected the mechanical properties of the bricks by reducing porosity and increasing the compressive strength of the bricks. Based on the test results obtained by each of the best test values, namely the minimum porosity value achieved in the percentage of oil palm fronds as much as 10%, which is 18.4%. The optimum compressive strength value is achieved on the percentage of oil palm fronds as much as 10% which is equal to 20.5 N / mm².

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