scholarly journals Effect of B4C reinforcement ratio and sintering temperature on the mechanical behavior in Al-B4C composites

2018 ◽  
Vol 50 (1) ◽  
pp. 51-61 ◽  
Author(s):  
Muharrem Pul
Keyword(s):  
Mechanical Properties ◽  
Adverse Effects ◽  
Sintering Temperature ◽  
Wear Test ◽  
Compression Pressure ◽  
Pressing Method ◽  
Reinforced Composite ◽  
Pin On Disk ◽  
Disk Method ◽  
Hardness Values

In this study, powders of Al 1070 and B4C were prepared by volume in three different reinforcement ratios 4 % B4C, 8 % B4C and 16 % B4C compacted under the pressure of 500 MPa with cold pressing method then sintered under the temperatures of 500, 550 and 600?C. Then the hardness was measured and wear test was performed using pin-on-disk method. In the results of tests, the compression pressure of 500 MPa was not sufficient for composite structure to achieve the required density. The highest hardness values were achieved at sintering temperature of 550?C and in 8 % B4C reinforced composite. The highest wear rate was measured in 4% B4C reinforced composite specimen sintered at 600?C. It is determined that a sintering temperature above 550?C had adverse effects on the mechanical properties.

Study of Mechanical Properties of Magnesium Oxide Doped Alumina (Al2O3) and Yttria Stabilized Zirconia (YSZ) Composite for Medical Applications

2012 ◽  
Vol 506 ◽  
pp. 521-524 ◽  
Author(s):  
A. Phothawan ◽  
K. Nganvongpanit ◽  
T. Tunkasiri ◽  
Sukum Eitssayeam
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Magnesium Oxide ◽  
Sintering Temperature ◽  
The Body ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Electron Microscopes ◽  
Pin On Disk ◽  
Scanning Electron Microscopes

The aim of this research is to study the mechanical properties such as hardness ,wear resistance etc , of the magnesium oxide (MgO) doped alumina (Al2O3) and yttria stabilized zirconia (YSZ) composite, We first prepared MgO-doped Al2O3(denoted as Al4) by mixing Al2O3powder and 0.4 wt% of MgO powder. After that Al4powder was mixed YSZ powder, with the formula [(x)Al4- (100-x)YS when x was varied from 0 - 100 by wt%. The samples were sintered at 1450, 1500, 1550, 1600 and 1650 °C. In addition, microstructure of the surface was studied employing both optical and scanning electron microscopes. The hardness of the surface was investigated by Vickers indentation technique and pin on disk apparatus was employed for wear rate measurement. The results showed that the density and volume shrinkage decreased with the increase of Al4content. The grain size and porosity of the specimens tend to decrease when the sintering temperature increases. The hardness and wear resistance of the samples increased with the increase of Al4up to 90 %. It was also found that the material is not toxic to the body.

scholarly journals Effect of marble powder concentration on Mechanical Properties of unsaturated polyster resin for the development of rock climbing holds

2018 ◽  
Author(s):  
Andriya Narasimhulu ◽  
ROHIT SHANDLEY
Keyword(s):  
Mechanical Properties ◽  
Unsaturated Polyester ◽  
Rock Climbing ◽  
Powder Concentration ◽  
Reinforced Composite ◽  
Artificial Environment ◽  
Marble Powder ◽  
Izod Impact ◽  
Particle Reinforced Composite ◽  
Hardness Values

The introduction of climbing holds has given rise to indoor climbing facilities. Climbing holds arranged in the form of a route are used to simulate an artificial environment for rock climbing, often similar to that found in nature. This paper highlights the significance of material composition for the application of rock climbing hold manufacture. A particle reinforced composite material, comprising of an unsaturated polyester resin, reinforced with marble powder was developed and the effect on mechanical properties was studied with varying powder concentration , beginning from 0% reinforcement to 30%, 40%, 50% and subsequently 60 % reinforcement . Test specimens were made according to ASTM standards and were tested for tensile, izod impact strength and Rockwell hardness. Trends were established based on the results obtained. Furthermore, hardness values were also compared with commercially available climbing holds.

scholarly journals The effect of locally source carbonaceous materials on the mechanical properties of mild steel

2016 ◽  
Vol 5 (3) ◽  
pp. 77
Author(s):  
Dongo Isaac Enesi ◽  
Seidu S. Ojo ◽  
Ogbodo Friday John
Keyword(s):  
Mechanical Properties ◽  
Mild Steel ◽  
Wear Test ◽  
Tensile Tests ◽  
Standard Test ◽  
Carbonaceous Materials ◽  
Animal Bone ◽  
Respective Treatment ◽  
Core Hardness ◽  
Hardness Values

The work focuses on the effects of locally sourced carbonaceous materials such as Animal bone, Snail shell and Periwinkle Shell on the mechanical properties of mild steel carburized at varying treatment temperatures of 700, 800, 900, 1000 and 1100 °C, soaked at varying carburizing time of 5hr, 4hr, 3hr, 2hr and 1hr at the respective treatment temperatures. The samples are quenched in oil and tempered at 350°C for 45 minutes. Prior to the carburization process, standard test samples were prepared from the as received specimen for tensile tests, wear test and micro hardness analysis. After the carburization process, the test samples were subjected to standard test to generate data for ultimate tensile strength, the case and core hardness values, wear rate and wear resistance of the carburized samples. The study shows that the mechanical properties of mild steels were found to be strongly influence by each of the carbonaceous materials.

Densification Behavior of Nano Y-TZP Ceramics

2013 ◽  
Vol 372 ◽  
pp. 165-168 ◽  
Author(s):  
A. Norakmal ◽  
Ramesh Singh ◽  
C.Y. Tan ◽  
W.D. Teng
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Bulk Density ◽  
Young’S Modulus ◽  
Sintering Temperature ◽  
Young's Modulus ◽  
Densification Behavior ◽  
Work Samples ◽  
Hardness Values

The effects of sintering temperatures on consolidation and mechanical properties of 3 mol% Y-TZP (3Y-TZP) powders were studied in this work. Samples were sintered at 1250°C to 1450°C sintering temperature in air. Throughout the sintering regime, high value of relative bulk density 99.41% of theoretical densities was obtained for the maximum sintering temperature. Maximum Young's modulus of 3Y-TZP was obtained at 1450°C and maximum fracture toughness value of 3Y-TZP was observed at the 1300°C sintering temperature. The Vickers's hardness values of 3Y-TZP also increased gradually with sintering temperature.

scholarly journals Experimental Investigation on Mechanical Properties of TiAlN Thin Films Deposited by RF Magnetron Sputtering

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
L. Natrayan ◽  
S. Balaji ◽  
G. Bharathiraja ◽  
S. Kaliappan ◽  
Dhinakaran Veeman ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Wear Resistance ◽  
Magnetron Sputtering ◽  
Steel Substrate ◽  
Substrate Surface ◽  
Wear Test ◽  
Rf Magnetron Sputtering ◽  
Pin On Disk ◽  
Steel Substrates

The mechanical properties of TiAlN deposited on the steel are explained in this study. Thin films are deposited by RF magnetron sputtering on the steel substrates to improve the wear resistance and hardness of the samples. Due to their improved microstructure and nanograins, the nanofilms have improved the mechanical properties of the steel substrate surface. The thin film deposited has improved the wear resistance by 80% and has improved the hardness by 95%. The deposited thin films are tested for hardness by nanoindentation and wear test by the pin-on-disk test. SEM has tested films for their microstructure and adhesion by nanoscratch test.

The Effect of Ion Induced Damage on the Mechanical Properties of Zirconia

1989 ◽  
Vol 157 ◽  
Author(s):  
E. L. Fleischer ◽  
W. Herd ◽  
T. L. Alford ◽  
P. Børgesen ◽  
P. Revesz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Ion Implantation ◽  
Friction And Wear ◽  
High Dose ◽  
Micro Hardness ◽  
A Value ◽  
Pin On Disk ◽  
Ion Species ◽  
Hardness Values

ABSTRACTMicrohardness measurements were carried out on ion implanted single crystal Y2O3 stabilized cubic ZrO2. Ions were implanted up to fluences of 3×1017 ions/cm2. Comparison of the Knoop micro-hardness values of ZrO2 implanted with various species over a range of fluences showed that the principle variable causing hardness changes for inert ion implantation is damage energy and not the ion fluence nor the ion species. For shallow inert ion implants, the hardness versus damage energy gives a unified plot. Hardnesses rise with increasing deposited damage energy to a value 15% higher than that of unimplanted zirconia. With additional damage the hardness drops to a value 15% lower than that of the unimplanted zirconia. Deep implants showed 50% increases in hardness and significant fracture toughness increases.Friction and wear measurements of the shallow implants in a pin-on-disk assembly showed very different behavior for high dose versus unimplanted ZrO2. The unimplanted samples showed debris with an associated rise in friction. The implanted system showed much less debris and a constant value of friction even after 10,000 cycles.

Mechanical Properties and Oxidation Resistance of Hot Pressed B4C Ceramics Material

2011 ◽  
Vol 233-235 ◽  
pp. 2272-2275
Author(s):  
Xin Yan Yue ◽  
Bi Shuang Chen ◽  
Jing Zhao ◽  
Hong Qiang Ru ◽  
Wei Wang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Relative Density ◽  
Oxidation Resistance ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Experimental Results ◽  
Pressing Method

B4C ceramics were obtained using hot-pressing method. The effect of different sintering temperatures on the microstructures and mechanical properties of B4C ceramics were investigated. Oxidation resistances were studied over the range 600-850°C. The experimental results showed that the relative density, bending strength and fracture toughness all increased first and then decreased with increasing the sintering temperature. The Vickers-hardness increased as the sintering temperature increasing. When the sintering temperature was 1950°C, the B4C ceramics showed the optimized properties. The values of its relative density, Vickers-hardness, bending strength and fracture toughness were 99.1%, 34.0 GPa, 524.6 MPa and 6.56 MPa·m1/2, respectively.

Mechanical Properties of ZrO2 (Y2O3)-Al2O3 Nanocomposites with Addition of Hydroxyapatite Prepared by Spark Plasma Sintering

2009 ◽  
Vol 631-632 ◽  
pp. 413-423 ◽  
Author(s):  
Shu Feng Li ◽  
Hiroshi Izui ◽  
Michiharu Okano ◽  
Wei Hua Zhang ◽  
Taku Watanabe
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Spark Plasma Sintering ◽  
Vickers Hardness ◽  
Volume Fraction ◽  
Sintering Temperature ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Hardness Values

TZP-3Y20A/HA composites with addition of different volume fraction of hydroxyapatite (HA) were fabricated successfully using spark plasma sintering (SPS). The densification behavior and mechanical properties of composites are investigated as a function of sintering temperature and HA content respectively. The density of TZP-3Y20A composite increases steadily with temperature and a maximum value of 97.8% is obtained after sintering at 1400°C. Sintering the TZP-3Y20A/HA composites at 1400°C led to the decomposition of HA in the samples. Flexural strength, fracture toughness and Vickers hardness values increase with increasing sintering temperature, show decrease trend with increasing of HA content at the same temperature. They compared well with densities obtained at different sintering temperature. The maximum flexural strength, fracture toughness and Vickers hardness of 967.1 MPa, 5.27 MPam1/2 and 13.26 GPa were achieved for TZP-3Y20A composite respectively. Flexural strength, fracture toughness and Vickers hardness values of TZP-3Y20A/HA composite fell within the value range of dense HA and of TZP-3Y20A composite.

scholarly journals Tribological and Mechanical Properties of Fe/Ti Multilayered films

1990 ◽  
Vol 188 ◽  
Author(s):  
M. Nastasi ◽  
J-P. Hirvonen ◽  
T. R. Jervis ◽  
S. N. Basu
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Solid State Reaction ◽  
Wear Test ◽  
Nanocrystalline Alloy ◽  
Multilayered Structure ◽  
Surface Films ◽  
Hardened Tool Steel ◽  
Film Substrate ◽  
Pin On Disk

ABSTRACTA 900 Å as-deposited multilayered structure of alternating Fe and Ti on hardened tool steel has been examined for tribological and mechanical properties. The multilayer in contact with a 52100 steel ball counter surface possessed a 0.16 friction coefficient and showed good wear character after 1000 cycles in pin-on-disk experiments. Nanoindentation experiments show a 20 % increase in hardness for material in the wear track. Electron microscopy data suggests that the as-deposited bcc-Fe plus hcp-Ti multilayer composite transforms to a nanocrystalline alloy plus bcc-Fe by solid state reaction during pin-on-disk friction and wear test. The low friction observed in these surface films is attributed to the formation of a hard nanocrystalline alloy and improved interlayer and film/substrate adhesion which result during solid state reaction.

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