Effect of additives introduced by ball milling on sintering behavior and mechanical properties of hot-pressed B4C ceramics

Bone reconstruction is a complex process which involves an osteoconductive matrix, osteoinductive signaling, osteogenic cells, vascularization and mechanical stability. Lately, to improve the healing of the bone defects and to accelerate the bone fusion and bone augmentation, bioceramic composite materials have been used as bone substitutes in the field of orthopedics and dentistry, as well as in cosmetic surgery. Of all types of bioceramics, the most used is hydroxyapatite, because of its similar properties to those of the human bone and better mechanical properties compared to b-tricalcium phosphate [1]. Currently, the most used raw materials sources for obtaining the hydroxyapatite are: bovine bone, seashells, corals, oyster shell, eggshells and human teeth. There are two common ways to obtain hydroxyapatite: synthetically and naturally. Generally, for the improvement of the mechanical properties and the structural one, hydroxyapatite is subjected to the sintering process. Considering the disadvantages of hydroxyapatite such as poor biodegradation rate, b-TCP has been developed, which has some disadvantages too, such as brittleness. For this reason, the aim of this study is to look into the effect of adding magnesium oxide on the sintering behavior, the structure and the mechanical properties of the hydroxyapatite-tricalcium phosphate composites.

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Experimental Investigation and Micro-Structural Evolution Analysis of CNT & Fly Ash Reinforced Aluminium Matrix Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.830-831.429 ◽

2015 ◽

Vol 830-831 ◽

pp. 429-432 ◽

Cited By ~ 1

Author(s):

Udaya ◽

Peter Fernandes

Keyword(s):

Mechanical Properties ◽

Experimental Investigation ◽

Fly Ash ◽

Ball Milling ◽

Milling Time ◽

Structural Evolution ◽

Matrix Composites ◽

Evolution Analysis ◽

Ball Milling Time ◽

Al Matrix

The paper illustrates Carbon nanotubes reinforced pure Al (CNT/Al) composites and fly ash reinforced pure Al (FA/Al) composites produced by ball-milling and sintering. Microstructures of the fabricated composite were examined and the mechanical properties of the composites were tested and analysed. It was indicated that the CNTs and fly ash were uniformly dispersed into the Al matrix as ball-milling time increased with increase in hardness.

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Effect of Microwave and Conventional Modes of Heating on Sintering Behavior, Microstructural Evolution and Mechanical Properties of Al-Cu-Mn Alloys

Molecules ◽

10.3390/molecules26123675 ◽

2021 ◽

Vol 26 (12) ◽

pp. 3675

Author(s):

A. Muthuchamy ◽

Muthe Srikanth ◽

Dinesh K. Agrawal ◽

A. Raja Annamalai

Keyword(s):

Mechanical Properties ◽

Corrosion Resistance ◽

Aluminum Alloys ◽

Sintered Sample ◽

Sintering Behavior ◽

Sintered Alloy ◽

Conventional Radiation ◽

Sintered Aluminum ◽

Electron Microscopes ◽

Mechanical Properties And Corrosion

In this research, we intended to examine the effect of heating mode on the densification, microstructure, mechanical properties, and corrosion resistance of sintered aluminum alloys. The compacts were sintered in conventional (radiation-heated) and microwave (2.45 GHz, multimode) sintering furnaces followed by aging. Detailed analysis of the final sintered aluminum alloys was done using optical and scanning electron microscopes. The observations revealed that the microwave sintered sample has a relatively finer microstructure compared to its conventionally sintered counterparts. The experimental results also show that microwave sintered alloy has the best mechanical properties over conventionally sintered compacts. Similarly, the microwave sintered samples showed better corrosion resistance than conventionally sintered ones.

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Effect of TiO2 and MgO on Microstructure of α-Alumina Ceramics and its Sintering Behavior

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1112.519 ◽

2015 ◽

Vol 1112 ◽

pp. 519-523 ◽

Cited By ~ 2

Author(s):

Jarot Raharjo ◽

Sri Rahayu ◽

Tika Mustika ◽

Masmui ◽

Dwi Budiyanto

Keyword(s):

Mechanical Properties ◽

Sintering Temperature ◽

Physical And Mechanical Properties ◽

Basic Material ◽

Sintering Behavior ◽

Pressureless Sintering ◽

Alumina Ceramics ◽

Density Measurements ◽

Technical Alumina ◽

Platelet Structure

Observation on the effect of adding titanium oxide (TiO2) and magnesium oxide (MgO) on the sintering of α-alumina (Al2O3) has been performed. In this study, technical alumina used as basic material in which the sample is formed by the pressureless sintering/cold press and sintered at 1500°C which is lower than alumina sintering temperature at 1700°C. Elemental analysis, observation of microstructure, hardness, fracture toughness and density measurements were carried out to determine the physical and mechanical properties of alumina. The results indicate a change in the microstructure where the content of the platelet structure are much more than the equilateral structure. At sintering temperature of 1500°C, neck growth occurs at ceramics grain, supported by the results of the density test which indicate perfect compaction has occurred in this process.

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Mechanical Properties of Nanocrystalline Materials Produced by In Situ Consolidation Ball Milling

Materials Science Forum ◽

10.4028/www.scientific.net/msf.579.15 ◽

2008 ◽

Vol 579 ◽

pp. 15-28 ◽

Cited By ~ 8

Author(s):

Carl C. Koch ◽

Khaled M. Youssef ◽

Ron O. Scattergood

Keyword(s):

Mechanical Properties ◽

Ball Milling ◽

Nanocrystalline Materials ◽

Preparation Method ◽

High Strength ◽

Al Alloys ◽

Ductile Metals ◽

Cu Alloys ◽

Bulk Nanocrystalline

This paper reviews a method, “in situ consolidation ball milling” that provides artifactfree bulk nanocrystalline samples for several ductile metals such as Zn, Al and Al alloys, and Cu and Cu alloys. The preparation method is described in this paper and examples of the mechanical behavior of nanocrystalline materials made by this technique are given. It is found that in such artifact-free metals, combinations of both high strength and good ductility are possible.

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Sintering Behavior and Mechanical Properties of Mullite Fibers/Hydroxyapatite Ceramic

Materials ◽

10.3390/ma11101859 ◽

2018 ◽

Vol 11 (10) ◽

pp. 1859 ◽

Cited By ~ 3

Author(s):

Xueni Zhao ◽

Qingyao Liu ◽

Jianjun Yang ◽

Weigang Zhang ◽

Yao Wang

Keyword(s):

Mechanical Properties ◽

Hydrothermal Synthesis ◽

Bending Strength ◽

Fiber Content ◽

Silicate Glasses ◽

Sintering Behavior ◽

Composite Powders ◽

Hydroxyapatite Ceramic ◽

Dense Microstructure ◽

Mullite Fibers

The effect of fiber content and sintering temperature on sintering behavior and mechanical properties of mullite fibers/hydroxyapatite composites was studied. The composites were fabricated by hydrothermal synthesis and pressureless sintering. The amount of fibers was varied from 5 wt % to 15 wt % through hydrothermal synthesis, mullite fibers and hydroxyapatite composite powders were subsequently sintered at temperatures of 1150, 1250, and 1350 °C. The composites presented a more perturbed structure by increasing fiber content. Moreover, the composites experienced pore coalescence and exhibited a dense microstructure at elevated temperature. X-ray diffraction indicated that the composites underwent various chemical reactions and generated silicate glasses. The generation of silicate glasses increased the driving force of particle rearrangement and decreased the number of pores, which promoted densification of the composites. Densification typically leads to increased hardness and bending strength. The study proposes a densification mechanism and opens new insights into the sintering properties of these materials.

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